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Publisher: Springer-Verlag   (Total: 2335 journals)

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Showing 1201 - 1400 of 2335 Journals sorted alphabetically
J. of Community Health     Hybrid Journal   (Followers: 8, SJR: 0.921, h-index: 44)
J. of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology     Hybrid Journal   (Followers: 7, SJR: 1.087, h-index: 74)
J. of Comparative Physiology B : Biochemical, Systemic, and Environmental Physiology     Hybrid Journal   (Followers: 4, SJR: 1.126, h-index: 59)
J. of Compassionate Health Care     Open Access   (Followers: 1)
J. of Computational Analysis and Applications     Hybrid Journal   (SJR: 0.291, h-index: 19)
J. of Computational Electronics     Hybrid Journal   (Followers: 4, SJR: 0.511, h-index: 20)
J. of Computational Neuroscience     Hybrid Journal   (Followers: 22, SJR: 1.068, h-index: 60)
J. of Computer and Systems Sciences Intl.     Hybrid Journal   (SJR: 0.27, h-index: 13)
J. of Computer Science and Technology     Open Access   (Followers: 5, SJR: 0.437, h-index: 31)
J. of Computer Virology and Hacking Techniques     Hybrid Journal   (Followers: 6, SJR: 0.151, h-index: 2)
J. of Computer-Aided Molecular Design     Hybrid Journal   (Followers: 3, SJR: 0.995, h-index: 78)
J. of Computers in Education     Hybrid Journal   (Followers: 8)
J. of Computing in Higher Education     Hybrid Journal   (Followers: 13, SJR: 0.363, h-index: 21)
J. of Consumer Policy     Hybrid Journal   (Followers: 5, SJR: 0.704, h-index: 30)
J. of Contemporary Mathematical Analysis     Hybrid Journal   (SJR: 0.237, h-index: 5)
J. of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 11, SJR: 0.197, h-index: 6)
J. of Contemporary Psychotherapy     Hybrid Journal   (Followers: 5, SJR: 0.397, h-index: 23)
J. of Control Theory and Applications     Hybrid Journal   (Followers: 2, SJR: 0.359, h-index: 19)
J. of Control, Automation and Electrical Systems     Hybrid Journal   (Followers: 7, SJR: 0.231, h-index: 9)
J. of Crop Science and Biotechnology     Hybrid Journal   (Followers: 7)
J. of Cross-Cultural Gerontology     Hybrid Journal   (Followers: 5, SJR: 0.631, h-index: 29)
J. of Cryptographic Engineering     Partially Free   (Followers: 5, SJR: 0.989, h-index: 11)
J. of Cryptology     Hybrid Journal   (Followers: 2, SJR: 1.443, h-index: 55)
J. of Cultural Economics     Hybrid Journal   (Followers: 4, SJR: 0.539, h-index: 29)
J. of Database Marketing & Customer Strategy Management     Hybrid Journal   (Followers: 8, SJR: 0.149, h-index: 8)
J. of Derivatives & Hedge Funds     Hybrid Journal   (Followers: 9, SJR: 0.114, h-index: 5)
J. of Developmental and Physical Disabilities     Hybrid Journal   (Followers: 8, SJR: 0.574, h-index: 29)
J. of Digital Imaging     Hybrid Journal   (Followers: 9, SJR: 0.578, h-index: 35)
J. of Direct Data and Digital Marketing Practice     Hybrid Journal   (Followers: 8, SJR: 0.154, h-index: 6)
J. of Dynamical and Control Systems     Hybrid Journal   (Followers: 2, SJR: 0.4, h-index: 26)
J. of Dynamics and Differential Equations     Hybrid Journal   (SJR: 1.418, h-index: 31)
J. of Earth Science     Hybrid Journal   (Followers: 8, SJR: 0.483, h-index: 16)
J. of Earth System Science     Open Access   (Followers: 43, SJR: 0.448, h-index: 32)
J. of East Asian Linguistics     Hybrid Journal   (Followers: 5, SJR: 0.537, h-index: 20)
J. of Echocardiography     Hybrid Journal   (Followers: 4, SJR: 0.22, h-index: 3)
J. of Economic Growth     Hybrid Journal   (Followers: 28, SJR: 3.273, h-index: 63)
J. of Economic Interaction and Coordination     Hybrid Journal   (SJR: 0.263, h-index: 12)
J. of Economics     Hybrid Journal   (Followers: 15, SJR: 0.418, h-index: 23)
J. of Economics and Finance     Hybrid Journal   (Followers: 6, SJR: 0.272, h-index: 19)
J. of Educational Change     Hybrid Journal   (Followers: 7, SJR: 0.961, h-index: 21)
J. of Elasticity     Hybrid Journal   (Followers: 5, SJR: 0.851, h-index: 45)
J. of Electroceramics     Hybrid Journal   (SJR: 0.577, h-index: 57)
J. of Electronic Materials     Hybrid Journal   (Followers: 3, SJR: 0.609, h-index: 75)
J. of Electronic Testing     Hybrid Journal   (Followers: 2, SJR: 0.372, h-index: 27)
J. of Electronics (China)     Hybrid Journal   (Followers: 4, SJR: 0.112, h-index: 9)
J. of Elementary Science Education     Hybrid Journal   (Followers: 8)
J. of Engineering Mathematics     Hybrid Journal   (SJR: 0.347, h-index: 37)
J. of Engineering Physics and Thermophysics     Hybrid Journal   (Followers: 1, SJR: 0.288, h-index: 11)
J. of Engineering Research     Open Access   (Followers: 1, SJR: 0.145, h-index: 5)
J. of Engineering Thermophysics     Hybrid Journal   (Followers: 2, SJR: 0.763, h-index: 9)
J. of Environmental Studies and Sciences     Partially Free   (Followers: 2)
J. of Ethology     Hybrid Journal   (Followers: 2, SJR: 0.609, h-index: 25)
J. of Evolution Equations     Hybrid Journal   (SJR: 0.826, h-index: 26)
J. of Evolutionary Biochemistry and Physiology     Hybrid Journal   (SJR: 0.145, h-index: 11)
J. of Evolutionary Economics     Hybrid Journal   (Followers: 8, SJR: 0.492, h-index: 52)
J. of Experimental and Theoretical Physics     Hybrid Journal   (Followers: 3, SJR: 0.458, h-index: 39)
J. of Experimental Criminology     Hybrid Journal   (Followers: 43, SJR: 1.445, h-index: 28)
J. of Failure Analysis and Prevention     Hybrid Journal   (Followers: 5, SJR: 0.261, h-index: 15)
J. of Family and Economic Issues     Hybrid Journal   (Followers: 6, SJR: 0.396, h-index: 32)
J. of Family Violence     Hybrid Journal   (Followers: 35, SJR: 0.639, h-index: 56)
J. of Financial Services Marketing     Hybrid Journal   (Followers: 3, SJR: 0.273, h-index: 10)
J. of Financial Services Research     Hybrid Journal   (Followers: 21, SJR: 0.572, h-index: 36)
J. of Fixed Point Theory and Applications     Hybrid Journal   (SJR: 0.644, h-index: 13)
J. of Fluorescence     Hybrid Journal   (Followers: 3, SJR: 0.465, h-index: 56)
J. of Food Measurement and Characterization     Hybrid Journal   (SJR: 0.307, h-index: 4)
J. of Food Science and Technology     Hybrid Journal   (Followers: 6, SJR: 0.441, h-index: 29)
J. of Forest Research     Hybrid Journal   (Followers: 3, SJR: 0.495, h-index: 27)
J. of Forestry Research     Hybrid Journal   (Followers: 6, SJR: 0.304, h-index: 14)
J. of Fourier Analysis and Applications     Hybrid Journal   (Followers: 1, SJR: 1.18, h-index: 42)
J. of Friction and Wear     Hybrid Journal   (Followers: 6, SJR: 0.373, h-index: 7)
J. of Fusion Energy     Hybrid Journal   (Followers: 3, SJR: 0.387, h-index: 19)
J. of Gambling Studies     Hybrid Journal   (Followers: 4, SJR: 1.171, h-index: 57)
J. of Gastroenterology     Hybrid Journal   (Followers: 11, SJR: 1.651, h-index: 88)
J. of Gastrointestinal Cancer     Hybrid Journal   (Followers: 3, SJR: 0.304, h-index: 39)
J. of Gastrointestinal Surgery     Hybrid Journal   (Followers: 6, SJR: 1.64, h-index: 99)
J. of General Internal Medicine     Hybrid Journal   (Followers: 15, SJR: 1.804, h-index: 134)
J. of General Plant Pathology     Hybrid Journal   (SJR: 0.554, h-index: 22)
J. of Genetic Counseling     Hybrid Journal   (Followers: 5, SJR: 0.902, h-index: 39)
J. of Genetics     Open Access   (Followers: 4, SJR: 0.458, h-index: 28)
J. of Geodesy     Hybrid Journal   (Followers: 8, SJR: 2.173, h-index: 56)
J. of Geographical Sciences     Hybrid Journal   (Followers: 1, SJR: 0.8, h-index: 23)
J. of Geographical Systems     Hybrid Journal   (Followers: 4, SJR: 0.822, h-index: 39)
J. of Geometric Analysis     Hybrid Journal   (SJR: 1.491, h-index: 27)
J. of Geometry     Hybrid Journal   (Followers: 1, SJR: 0.272, h-index: 15)
J. of Global Optimization     Hybrid Journal   (Followers: 4, SJR: 0.992, h-index: 60)
J. of Global Policy and Governance     Hybrid Journal   (Followers: 8)
J. of Grid Computing     Hybrid Journal   (SJR: 1.414, h-index: 37)
J. of Hand and Microsurgery     Hybrid Journal   (Followers: 1)
J. of Happiness Studies     Hybrid Journal   (Followers: 18, SJR: 0.881, h-index: 39)
J. of Hematopathology     Hybrid Journal   (Followers: 4, SJR: 0.2, h-index: 13)
J. of Heuristics     Hybrid Journal   (Followers: 5, SJR: 1.308, h-index: 50)
J. of High Energy Physics     Hybrid Journal   (Followers: 19, SJR: 1.052, h-index: 153)
J. of Homotopy and Related Structures     Hybrid Journal   (SJR: 0.232, h-index: 2)
J. of Housing and the Built Environment     Hybrid Journal   (Followers: 7, SJR: 0.648, h-index: 28)
J. of Huazhong University of Science and Technology [Medical Sciences]     Hybrid Journal   (SJR: 0.344, h-index: 19)
J. of Ichthyology     Hybrid Journal   (Followers: 3, SJR: 0.304, h-index: 10)
J. of Immigrant and Minority Health     Hybrid Journal   (Followers: 10, SJR: 0.759, h-index: 37)
J. of Inclusion Phenomena and Macrocyclic Chemistry     Hybrid Journal   (Followers: 1, SJR: 0.331, h-index: 46)
J. of Indian Philosophy     Hybrid Journal   (Followers: 11, SJR: 0.127, h-index: 12)
J. of Indian Prosthodontic Society     Open Access   (SJR: 0.164, h-index: 7)
J. of Industrial Microbiology and Biotechnology     Hybrid Journal   (Followers: 14, SJR: 0.966, h-index: 80)
J. of Industry, Competition and Trade     Hybrid Journal   (Followers: 8, SJR: 0.327, h-index: 15)
J. of Infection and Chemotherapy     Hybrid Journal   (Followers: 1, SJR: 0.673, h-index: 46)
J. of Information Technology     Hybrid Journal   (Followers: 52, SJR: 1.474, h-index: 55)
J. of Information Technology Teaching Cases     Hybrid Journal   (Followers: 8)
J. of Infrared, Millimeter and Terahertz Waves     Hybrid Journal   (Followers: 2, SJR: 1.25, h-index: 36)
J. of Inherited Metabolic Disease     Hybrid Journal   (Followers: 2, SJR: 1.389, h-index: 77)
J. of Inorganic and Organometallic Polymers and Materials     Partially Free   (Followers: 8, SJR: 0.338, h-index: 33)
J. of Insect Behavior     Hybrid Journal   (Followers: 9, SJR: 0.569, h-index: 39)
J. of Insect Conservation     Hybrid Journal   (Followers: 10, SJR: 0.872, h-index: 43)
J. of Intelligent and Robotic Systems     Hybrid Journal   (Followers: 2, SJR: 0.629, h-index: 43)
J. of Intelligent Information Systems     Hybrid Journal   (Followers: 1, SJR: 0.691, h-index: 43)
J. of Intelligent Manufacturing     Hybrid Journal   (Followers: 4, SJR: 1.397, h-index: 54)
J. of Interventional Cardiac Electrophysiology     Hybrid Journal   (SJR: 0.93, h-index: 43)
J. of Intl. Business Studies     Hybrid Journal   (Followers: 29, SJR: 4.208, h-index: 130)
J. of Intl. Entrepreneurship     Hybrid Journal   (Followers: 9, SJR: 0.549, h-index: 23)
J. of Intl. Migration and Integration / Revue de l integration et de la migration internationale     Hybrid Journal   (Followers: 12, SJR: 0.308, h-index: 13)
J. of Intl. Relations and Development     Hybrid Journal   (Followers: 20, SJR: 0.793, h-index: 22)
J. of Labor Research     Hybrid Journal   (Followers: 17, SJR: 0.394, h-index: 27)
J. of Logic, Language and Information     Hybrid Journal   (Followers: 7, SJR: 0.288, h-index: 25)
J. of Low Temperature Physics     Hybrid Journal   (Followers: 2, SJR: 0.531, h-index: 52)
J. of Machinery Manufacture and Reliability     Hybrid Journal   (Followers: 2, SJR: 0.203, h-index: 7)
J. of Mammalian Evolution     Hybrid Journal   (Followers: 5, SJR: 1.134, h-index: 37)
J. of Mammary Gland Biology and Neoplasia     Hybrid Journal   (Followers: 1, SJR: 2.252, h-index: 83)
J. of Management and Governance     Hybrid Journal   (Followers: 13, SJR: 0.805, h-index: 33)
J. of Management Control     Hybrid Journal   (Followers: 5, SJR: 0.605, h-index: 6)
J. of Marine Science and Application     Hybrid Journal   (Followers: 3, SJR: 0.439, h-index: 11)
J. of Marine Science and Technology     Hybrid Journal   (Followers: 3, SJR: 0.235, h-index: 19)
J. of Maritime Archaeology     Hybrid Journal   (Followers: 21, SJR: 0.228, h-index: 8)
J. of Market-Focused Management     Hybrid Journal   (Followers: 2)
J. of Marketing Analytics     Hybrid Journal   (Followers: 3)
J. of Material Cycles and Waste Management     Hybrid Journal   (Followers: 3, SJR: 0.449, h-index: 22)
J. of Materials Engineering and Performance     Hybrid Journal   (Followers: 22, SJR: 0.544, h-index: 40)
J. of Materials Science     Hybrid Journal   (Followers: 19, SJR: 0.836, h-index: 123)
J. of Materials Science : Materials in Electronics     Hybrid Journal   (Followers: 3)
J. of Materials Science : Materials in Medicine     Hybrid Journal   (Followers: 5)
J. of Mathematical Biology     Hybrid Journal   (Followers: 12, SJR: 1.011, h-index: 71)
J. of Mathematical Chemistry     Hybrid Journal   (Followers: 5, SJR: 0.497, h-index: 45)
J. of Mathematical Fluid Mechanics     Hybrid Journal   (Followers: 6, SJR: 1.22, h-index: 22)
J. of Mathematical Imaging and Vision     Hybrid Journal   (Followers: 4, SJR: 0.901, h-index: 53)
J. of Mathematical Modelling and Algorithms     Hybrid Journal   (Followers: 2, SJR: 0.414, h-index: 23)
J. of Mathematical Sciences     Hybrid Journal   (SJR: 0.272, h-index: 23)
J. of Mathematics Teacher Education     Hybrid Journal   (Followers: 14, SJR: 1.062, h-index: 20)
J. of Maxillofacial and Oral Surgery     Hybrid Journal   (Followers: 1)
J. of Mechanical Science and Technology     Hybrid Journal   (Followers: 5, SJR: 0.589, h-index: 26)
J. of Medical and Biological Engineering     Hybrid Journal   (Followers: 1, SJR: 0.387, h-index: 18)
J. of Medical Humanities     Hybrid Journal   (Followers: 22, SJR: 0.299, h-index: 18)
J. of Medical Systems     Hybrid Journal   (Followers: 1, SJR: 0.717, h-index: 44)
J. of Medical Toxicology     Hybrid Journal   (Followers: 4, SJR: 0.874, h-index: 28)
J. of Medical Ultrasonics     Hybrid Journal   (Followers: 2, SJR: 0.18, h-index: 13)
J. of Medicine and the Person     Hybrid Journal  
J. of Membrane Biology     Hybrid Journal   (Followers: 2, SJR: 0.738, h-index: 82)
J. of Micro-Bio Robotics     Hybrid Journal   (SJR: 0.28, h-index: 3)
J. of Microbiology     Hybrid Journal   (Followers: 7, SJR: 0.741, h-index: 43)
J. of Mining Science     Hybrid Journal   (Followers: 5, SJR: 0.317, h-index: 16)
J. of Molecular Evolution     Hybrid Journal   (Followers: 9, SJR: 0.952, h-index: 108)
J. of Molecular Histology     Hybrid Journal   (Followers: 2, SJR: 0.755, h-index: 48)
J. of Molecular Medicine     Hybrid Journal   (Followers: 15, SJR: 2.165, h-index: 113)
J. of Molecular Modeling     Hybrid Journal   (Followers: 4, SJR: 0.466, h-index: 50)
J. of Molecular Neuroscience     Partially Free   (Followers: 10, SJR: 0.988, h-index: 69)
J. of Mountain Science     Hybrid Journal   (Followers: 4, SJR: 0.418, h-index: 15)
J. of Muscle Research and Cell Motility     Hybrid Journal   (Followers: 1, SJR: 1.264, h-index: 55)
J. of Nanoparticle Research     Hybrid Journal   (Followers: 4, SJR: 0.583, h-index: 84)
J. of Natural Medicines     Hybrid Journal   (SJR: 0.602, h-index: 28)
J. of Near-Death Studies     Hybrid Journal   (Followers: 2)
J. of Nephrology     Hybrid Journal   (Followers: 5, SJR: 0.689, h-index: 55)
J. of Network and Systems Management     Hybrid Journal   (SJR: 0.466, h-index: 26)
J. of Neural Transmission     Hybrid Journal   (Followers: 2, SJR: 1.034, h-index: 86)
J. of Neuro-Oncology     Hybrid Journal   (Followers: 4, SJR: 1.274, h-index: 90)
J. of Neuroimmune Pharmacology     Hybrid Journal   (Followers: 1, SJR: 1.662, h-index: 45)
J. of Neurology     Hybrid Journal   (Followers: 13, SJR: 1.429, h-index: 105)
J. of NeuroVirology     Hybrid Journal   (Followers: 1, SJR: 0.979, h-index: 69)
J. of Nondestructive Evaluation     Hybrid Journal   (Followers: 9, SJR: 0.863, h-index: 27)
J. of Nonlinear Science     Hybrid Journal   (Followers: 1, SJR: 1.887, h-index: 42)
J. of Nonverbal Behavior     Hybrid Journal   (Followers: 5, SJR: 0.723, h-index: 47)
J. of Nuclear Cardiology     Hybrid Journal   (SJR: 1.024, h-index: 68)
J. of Nutrition, Health and Aging     Hybrid Journal   (Followers: 19, SJR: 0.919, h-index: 60)
J. of Obstetrics and Gynecology of India     Hybrid Journal   (Followers: 6, SJR: 0.214, h-index: 6)
J. of Occupational Rehabilitation     Hybrid Journal   (Followers: 16, SJR: 0.811, h-index: 51)
J. of Ocean Engineering and Marine Energy     Hybrid Journal   (Followers: 1)
J. of Ocean University of China (English Edition)     Hybrid Journal   (Followers: 1, SJR: 0.237, h-index: 11)
J. of Oceanography     Hybrid Journal   (Followers: 10, SJR: 0.796, h-index: 52)
J. of Ocular Biology, Diseases, and Informatics     Hybrid Journal   (SJR: 0.183, h-index: 11)
J. of Optical and Fiber Communications Reports     Hybrid Journal   (Followers: 3)
J. of Optics     Hybrid Journal   (Followers: 8, SJR: 0.214, h-index: 8)
J. of Optimization Theory and Applications     Hybrid Journal   (Followers: 4, SJR: 0.898, h-index: 65)
J. of Ornithology     Hybrid Journal   (Followers: 21)
J. of Orofacial Orthopedics / Fortschritte der Kieferorthopädie     Hybrid Journal   (SJR: 0.574, h-index: 33)
J. of Orthopaedic Science     Hybrid Journal   (Followers: 5, SJR: 0.708, h-index: 48)
J. of Paleolimnology     Hybrid Journal   (Followers: 5, SJR: 0.984, h-index: 64)
J. of Parasitic Diseases     Hybrid Journal   (Followers: 2, SJR: 0.298, h-index: 9)
J. of Pediatric Neuropsychology     Hybrid Journal   (Followers: 3)
J. of Pest Science     Hybrid Journal   (Followers: 2, SJR: 1.341, h-index: 28)
J. of Pharmaceutical Health Care and Sciences     Open Access  
J. of Pharmaceutical Innovation     Hybrid Journal   (Followers: 8, SJR: 0.524, h-index: 17)
J. of Pharmaceutical Investigation     Hybrid Journal   (Followers: 1, SJR: 0.331, h-index: 6)
J. of Pharmacokinetics and Pharmacodynamics     Hybrid Journal   (Followers: 18, SJR: 0.708, h-index: 46)
J. of Phase Equilibria and Diffusion     Hybrid Journal   (Followers: 18, SJR: 0.433, h-index: 36)
J. of Philosophical Logic     Hybrid Journal   (Followers: 8, SJR: 0.704, h-index: 26)
J. of Physiology and Biochemistry     Hybrid Journal   (Followers: 3, SJR: 0.87, h-index: 33)

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Journal Cover European Food Research and Technology
  [SJR: 0.726]   [H-I: 70]   [7 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1438-2377 - ISSN (Online) 1438-2385
   Published by Springer-Verlag Homepage  [2335 journals]
  • Identification of aroma compounds and precursors of sour guava ( Psidium
           friedrichsthalianum Nied.) following a sensomics approach
    • Authors: Carmen Tatiana Cuadrado-Silva; María Ángeles Pozo-Bayón; Coralia Osorio
      Pages: 1 - 10
      Abstract: Abstract In this work, a sensomics approach was followed to determine the chemical constituents responsible for sour guava (Psidium friedrichsthalianum Nied.) aroma. The odour-active volatiles were isolated by solvent-assisted flavour evaporation (SAFE) with dichloromethane. By application of the aroma extract dilution analysis (AEDA), ethyl butanoate and ethyl hexanoate, 3-sulphanylhexyl acetate (sulphury), and δ-dodecalactone (fruity) were identified with the highest flavour dilution factors among the 18 odour-active compounds. Quantitative measurements performed with the internal standard method allowed to calculate the odour activity values and revealed the important role of ethyl butanoate, (Z)-3-hexenal, and ethyl hexanoate as key aroma compounds in this fruit. The sulphur compounds, dimethyl disulphide, 2-methyl-1,3-dithiolane, methional, 3-sulphanylhexyl acetate, 3-sulphanyl-1-hexanol, and bis(methylthio)methane, are reported here as sensory relevant odorants to the flavour of this fruit. The role of hexyl-β-l-glucopyranoside and 3-(1-hexanol)-l-cysteine as precursors of hexanol, and 3-sulphanyl hexanol, respectively, was demonstrated by enzymatic hydrolysis of corresponding precursor mixtures.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2716-y
      Issue No: Vol. 243, No. 1 (2017)
       
  • Mitigation of ovalbumin glycation in vitro by its treatment with green tea
           polyphenols
    • Authors: Ezgi Doğan Cömert; H. Gül Akıllıoğlu; Vural Gökmen
      Pages: 11 - 19
      Abstract: Abstract Polyphenols are known as inhibitors of glycation since they alter the pathways of the Maillard reaction by several mechanisms involving antioxidant activity, reactive dicarbonyl trapping, inhibition of sugar autoxidation, and amino group binding. Green tea is a rich source of polyphenols. This study aimed to investigate the effects of protein modification with green tea polyphenols on glycation potential of ovalbumin. For this purpose, green tea infusion was prepared and ovalbumin was treated with that infusion at alkaline pH conditions in order to let oxidation of polyphenols to quinone forms and formation of covalent linkages between quinones and amine residues of protein. This modified ovalbumin was heated with glucose at 90 °C. Furosine, the compound formed from N-ε-fructoselysine during acid hydrolysis, and N-ε-carboxymethyl lysine (CML) as indicators of early and advanced glycation, respectively, were monitored. Free lysine concentrations and antioxidant activity were measured in order to enlighten the interaction mechanism. Results showed that treatment of ovalbumin with green tea phenolics before reaction with glucose has a potential to limit glycation. In total 15 % less furosine was formed in treated ovalbumin than control ovalbumin upon heating at 90 °C for 1 h, whereas 14 % less CML was formed.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2717-x
      Issue No: Vol. 243, No. 1 (2017)
       
  • Riboflavin and chlorophyll as photosensitizers in electroformed giant
           unilamellar vesicles as food models
    • Authors: Hui-Jing Wang; Ran Liang; Hui-Hui Du; Jing-Xuan Ai; Rui-Min Han; Jian-Ping Zhang; Leif H. Skibsted
      Pages: 21 - 26
      Abstract: Abstract Electroformed giant unilamellar vesicles (GUVs) were found to have optimal sizes (~10 µm average diameter) for studying effects of photosensitizers and antioxidants in lipid bilayers as food models. By using optical microscopy and digital image processing techniques, no membrane damage was found for hydrophilic riboflavin, while lipophilic chlorophyll a initiated GUV budding and subsequent disintegration under light irradiation, indicating that lipophilic photosensitizers are the more important in such structured lipids. Lipophilic β-carotene provided protection against oxidative damage induced by chlorophyll a as shown by an increased lag phase for budding; however, it had no effect on subsequent budding rate. Hydrophilic puerarin alone exhibited little protection in terms of lag phase, but decreased together with β-carotene budding rate after the lag phase by a factor of more than 2, showing a clear synergistic effect between a hydrophilic antioxidant, inactive in the aqueous phase alone, and a lipophilic antioxidant protecting lipids.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2718-9
      Issue No: Vol. 243, No. 1 (2017)
       
  • Determining the true content of quercetin and its derivatives in plants
           employing SSDM and LC–MS analysis
    • Authors: Dorota Wianowska; Andrzej L. Dawidowicz; Katarzyna Bernacik; Rafał Typek
      Pages: 27 - 40
      Abstract: Abstract Reliable plant analysis is a challenging task due to the physical character and chemical complexity of plant matrices. First of all, it requires the application of a proper sample preparation procedure to fully isolate the analyzed substances from the plant matrix. The high-temperature liquid–solid extraction is commonly applied for this purpose. In the light of recently published results, however, the application of high-temperature extraction for polyphenolics analysis in plants is disputable as it causes their transformation leading to erroneous quantitative estimations of these compounds. Experiments performed on different plants show that the transformation/degradation of quercetin and its glycosides is not induced by sea sand disruption method (SSDM) and prove the method to be most appropriate for the estimation of quercetin and its derivatives in plants. What is more, the application of SSDM in plant analysis allows the researcher, to determine which quercetin derivatives are native plant components and what is their true concentration. In other word, the application of SSDM in plant analysis eliminates errors in the study of plant metabolism involving quercetin and its derivatives.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2719-8
      Issue No: Vol. 243, No. 1 (2017)
       
  • Lactic acid bacteria communities in must, alcoholic and malolactic
           Tempranillo wine fermentations, by culture-dependent and
           culture-independent methods
    • Authors: Lucía González-Arenzana; Pilar Santamaría; Ana Rosa Gutiérrez; Rosa López; Isabel López-Alfaro
      Pages: 41 - 48
      Abstract: Abstract The lactic acid bacteria (LAB) communities from must and through alcoholic (AF) and malolactic fermentations (MLF) of Tempranillo red wines were studied in ten wineries from the Designation of Origin Rioja during three consecutive vintages. A statistical study with data from both methods, PCR-DGGE and plating, was performed. Results showed that the LAB community in the D.O. Rioja was highly determined by the type of fermentation and also by the different stages within the winemaking, while other factors such as year, winery, or sampling subzones had not significant effect on the LAB species distribution. Three microbial families, seven genera, and 25 species were described in this research, and Lactobacillus was the most commonly detected genus before MLF. Curiously, genera and species not frequently detected in wines as Weissella, Fructobacillus, and Oenococcus kitaharae were identified during AF, and no-Oenococcus oeni species were described in some MLF by both methods. For the first time, two new O. oeni allelic groups were determined by 16S rDNA/DGGE being randomly adapted to the wine environment. Further studies targeted to understand the implication of the novel species, and O. oeni allelic groups in Rioja wine fermentations could be really interesting.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2720-2
      Issue No: Vol. 243, No. 1 (2017)
       
  • Toxicity of the Lessepsian pufferfish Lagocephalus sceleratus from eastern
           Mediterranean coasts of Turkey and species identification by rapid PCR
           amplification
    • Authors: Caner Acar; Shoichiro Ishizaki; Yuji Nagashima
      Pages: 49 - 57
      Abstract: Abstract Pufferfish, Lagocephalus sceleratus, L. suezensis and L. spadiceus, are widely distributed Lessepsian species along the Turkish and other eastern Mediterranean coasts. L. sceleratus is considered one of the worst invasive species in the Mediterranean Sea and recently caused human intoxication by accidental consumption. Therefore, methods to assess pufferfish toxicity and accurately identify toxic pufferfish are important for food safety. Firstly, 20 specimens of L. sceleratus were collected from the eastern Mediterranean coasts of Turkey. Tetrodotoxin (TTX) content was determined among different tissues (muscle, liver, gonad, kidney, intestine and skin) by liquid chromatography-tandem mass spectrometry. All of the specimens contained TTX. The highest TTX concentration was detected in the ovary (80.0 µg TTX/g), followed by the intestine (48.8 µg TTX/g), kidney (34.0 µg TTX/g) and liver (25.4 µg TTX/g). The flesh and testis contained detectable amounts of TTX (3.4 µg TTX/g and 2.6 µg TTX/g, respectively). TTX analogs were also detected in the tissues, with 4,9-anhydro-5,6,11-trideoxyTTX and 5,6,11-trideoxyTTX being the major analog. A species-specific PCR method was developed to identify three species of genus Lagocephalus based on the nicotinamide adenine dinucleotide dehydrogenase subunit 2 or cytochrome oxidase subunit I regions of the mitochondrial DNA of L. sceleratus, L. suezensis, and L. spadiceus. The designed primers amplified only DNA of target species and not those of other fish and shellfish species. The species-specific PCR method successfully identified these pufferfish species and could be applied to thermally treated products of the pufferfish with only 1 ng of extracted DNA.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2721-1
      Issue No: Vol. 243, No. 1 (2017)
       
  • Influence of common and excessive enzymatic treatment on juice yield and
           anthocyanin content and profile during bilberry ( Vaccinium myrtillus L.)
           juice production
    • Authors: Peter Heffels; Franziska Bührle; Andreas Schieber; Fabian Weber
      Pages: 59 - 68
      Abstract: Abstract Treatment with cell wall-degrading enzymes is an important step during juice production to enhance juice yield and the amount of value-adding compounds like polyphenols. Enzymatic side activities may lead to unintended alterations of the polyphenol profile. We determined the effects of enzyme treatment on juice yield and content and profile of anthocyanins using four commercial pectinolytic and two cellulolytic enzymes during bilberry juice production. While enzyme dosage at commercial level (0.5 nkat/g) caused only small increases in juice yield but considerably higher anthocyanin yields, significant changes in the anthocyanin profile could be observed, which were related to the glycoside type as well as to the aglycone. Application of excessive enzyme dosage (10 nkat/g) significantly improved both juice yield and total anthocyanin content. Extractability of anthocyanins seems to be more relevant to profile changes during juice processing when usual enzyme dosages are applied, whereas excessive dosages lead to changes caused by enzymatic side activities.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2722-0
      Issue No: Vol. 243, No. 1 (2017)
       
  • Development of stable isotope dilution assays for the quantitation of the
           food odorants hydrogen sulphide, methanethiol, ethanethiol, and
           propane-1-thiol and application to durian ( Durio zibethinus L.) pulp
    • Authors: Jia-Xiao Li; Peter Schieberle; Martin Steinhaus
      Pages: 69 - 79
      Abstract: Abstract Stable isotope dilution assays were developed for the quantitation of the highly volatile odorants hydrogen sulphide, methanethiol, ethanethiol, and propane-1-thiol using sodium (34S)sulphide, sodium (2H3)methanethiolate, (2H5)ethanethiol, and (2H7)propane-1-thiol as internal standards and 3-buten-2-one as derivatisation reagent. Applying sodium as the reducing agent, sodium (34S)sulphide was synthesised from 34S8 and sodium (2H3)methanethiolate from (2H6)dimethyl sulphide. The analytical approach included homogenisation of the food material with the added standards, derivatisation, solvent extraction, and solvent-assisted flavour evaporation (SAFE). Separate detection of analytes and standards was achieved by two-dimensional heart-cut gas chromatography–mass spectrometry using chemical ionisation and characteristic ions of the derivatives 4,4′-sulphanediyldi-2-butanone, 4-(methylsulphanyl)butan-2-one, 4-(ethylsulphanyl)butan-2-one, and 4-(propylsulphanyl)butan-2-one and their isotopically substituted analogues. Application of the approach to durian pulp resulted in high odour activity values (OAV = concentration/odour threshold) with ethanethiol (OAV 480000) being the most potent odorant, followed by methanethiol (OAV 45000), propane-1-thiol (OAV 6300), and hydrogen sulphide (OAV 330).
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2723-z
      Issue No: Vol. 243, No. 1 (2017)
       
  • Effect of gamma radiation on the antibacterial and antibiofilm activity of
           honeydew honey
    • Authors: Miroslava Horniackova; Marcela Bucekova; Ivana Valachova; Juraj Majtan
      Pages: 81 - 88
      Abstract: Abstract A variety of honeys have been clinically tested in wound care; some of these have obtained status “medical-grade honey”. Honey-containing licensed wound care products must undergo a sterilization process by gamma radiation. However, even though the antibacterial activity of honey seems not be affected by gamma radiation, no studies have been performed to assess its influence on particular honey antibacterial compounds. Therefore, the aim of this study was to investigate the effect of gamma radiation at the levels of 10, 20 and 30 kGy on glucose oxidase-mediated generation of hydrogen peroxide (H2O2) and bee defensin-1 in fir honeydew honey. We found that gamma radiation did not affect the overall antibacterial activity of honeydew honey; however, the concentration of defensin-1 was significantly reduced in irradiated honey. H2O2 levels were not elevated in irradiated honey when compared to non-irradiated honey. Furthermore, the antibiofilm activity of irradiated honey was not negatively affected as it effectively reduced established biofilms of Staphylococcus aureus and Pseudomonas aeruginosa. These results demonstrate that gamma radiation, at the doses mentioned above, does not result in significant alterations in the antibacterial and antibiofilm activity of honeydew honey. However, low molecular weight proteins and peptides such as defensin-1 may aggregate in irradiated honey.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2725-x
      Issue No: Vol. 243, No. 1 (2017)
       
  • A review: benefit and bioactive properties of olive ( Olea europaea L.)
           leaves
    • Authors: Mehmet Musa Özcan; Bertrand Matthäus
      Pages: 89 - 99
      Abstract: Abstract Olive leaf tree is one of the most common, traditional herbal teas used among Mediterranean people to cure certain diseases. The phenolic compounds present in olive leaves, especially the oleuropein, are associated to antioxidant, antihypertensive, hypoglycemic, hypocholesterolemic and cardioprotective activity. Many olive oil producers even charge a fee to the olive farmer for the disposal of olive leaves. In current study, some of these studies on the beneficial health effects, antioxidant, antimicrobial and phenolic compounds of olive leaves are reviewed.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2726-9
      Issue No: Vol. 243, No. 1 (2017)
       
  • Characterization and geographical discrimination of Greek pine and thyme
           honeys based on their mineral content, using chemometrics
    • Authors: Ioannis K. Karabagias; Artemis P. Louppis; Stavros Kontakos; Chara Papastephanou; Michael G. Kontominas
      Pages: 101 - 113
      Abstract: Abstract The aim of the present study was: (1) to determine the mineral content of pine and thyme honeys produced in different regions in Greece and (2) differentiate pine and thyme honeys according to their geographical origin, based on selected minerals using multivariate analysis of variance (MANOVA) and linear discriminant analysis (LDA). For this purpose, 39 pine and 42 honey samples were collected from 9 different regions in Greece known to produce such types of honey. Twenty five minerals (Ag, Al, As, B, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, Hg, Mg, Mn, Mo, Ni, Pb, Sb, Se, Si, Ti, Tl, V, and Zn) were quantified using inductively coupled plasma-atomic emission spectroscopy. Results showed that pine and thyme honeys recorded variations in their mineral content according to geographical origin. A comparison between the two honey types revealed that pine honeys possessed 92.5 % higher total mineral content, compared to thyme honeys. This was also documented, by measuring electrical conductivity of pine and thyme honeys (mean ± SD values of 1.10 ± 0.27 and 0.40 ± 0.05, respectively) which gave an excellent Pearson’s correlation (r = 1) with their total mineral content. In addition, applying MANOVA and LDA to the mineral content of each honey type, honeys were satisfactorily correctly classified according to geographical origin. The correct prediction rates were 84.6 and 83.3 % for pine and thyme honeys, respectively, using the cross-validation method. Present results showed that selected minerals in combination with chemometrics may aid to the geographical differentiation of Greek honeys.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2727-8
      Issue No: Vol. 243, No. 1 (2017)
       
  • Effect of dispersed particles on instant coffee foam stability and
           rheological properties
    • Authors: Rebecca Gmoser; Romain Bordes; Gustav Nilsson; Annika Altskär; Mats Stading; Niklas Lorén; Marco Berta
      Pages: 115 - 121
      Abstract: Abstract Properties of instant coffee foam constitute the focus of this study. The coffee, obtained from commercial sources, was dispersed in water at a concentration in the range of standard use. The resulting solution contained a substantial amount of micron and submicron size particles that were filtered with membranes having difference size cut-offs in order to investigate the relationship foam properties—particles size. The foams produced from these solutions have been imaged by confocal laser scanning microscopy, and their moduli and stability have been measured by oscillatory rheology, using an in-house developed rheometric set-up. The results show that particles larger than 0.8 µm have little effect on the reduction of drainage while a clear strengthening effect on the foam was evident. This was a result of their diffusion to the lamellae borders, which increases the viscosity of the liquid–air interface. Particles smaller than 0.2 µm affect bubble coarsening and likely hinder the migration of soluble surface active species to the bubble surface. Particles also participate in the stabilization of the air–water interface, and this affects both the foam stability and mechanical properties. Established models developed for ideal foam systems containing particles are difficult to apply due to the complexity of the system studied. Despite this limitation, these results provide increased understanding of the effect of particles on instant coffee foams.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2728-7
      Issue No: Vol. 243, No. 1 (2017)
       
  • Combining numerical and fundamental approaches for the overall PET
           migration prediction: case of mineral water bottles
    • Authors: B. Zmit; K. Kerboua; A. Bali; F. Souahi; N. Belhaneche-Bensemra
      Pages: 123 - 131
      Abstract: Abstract This paper reports a study of overall migration of polethylene terephthalate (PET) components into Algerian mineral water aiming to elaborate a mathematical methodology that predicts the overall migration value. Several experiments were carried out on PET samples of 1.5 L and 33 cL bottles respecting the European Regulation (EU) No 10-2011. The obtained results allowed to establish a polynomial model based on the kinetic of the effects of temperature and PET thickness on the overall migration value. This model was developed through a set of 22 factorial plans, coupled to a fundamental model of kinetic migration. This innovative approach leads to a time-dependent equation that offers a better handling of the relatively complex phenomenon of container–content interactions.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2729-6
      Issue No: Vol. 243, No. 1 (2017)
       
  • Relative fermentation of oligosaccharides from human milk and plants by
           gut microbes
    • Authors: Jing Wang; Ceng Chen; Zhuoteng Yu; Yingying He; Qiang Yong; David S. Newburg
      Pages: 133 - 146
      Abstract: Abstract Gut microbiota is important to human health. Specific dietary glycans promote favorable microbiota growth and inhibit pathobionts. Dietary glycans most relevant to adults and weaned infants are derived from plants or lactose; human milk oligosaccharides (HMOS) are most relevant to breastfed infants. Their efficacy in supporting bacterial growth is compared to determine their potential roles in the initiation and maintenance of colonization. Bioactivities of gluco-manno-oligosaccharides (GMOS), galacto-oligosaccharides (GOS), xylo-oligosaccharides (XOS), cellobiose (CBS), HMOS, and the most prominent individual HMOS, 2′-fucosyllactose (2′-FL) were contrasted. Two representative gut microbiota mutualists, Bifidobacteria longum ATCC15697 and Lactobacillus acidophilus NRRL B-4495, and two non-mutualists, Campylobacter jejuni S107 and Escherichia coli K12, were used to assess the in vitro prebiotic potential of these oligosaccharides. All oligosaccharides afforded growth of B. longum and L. acidophilus, with HMOS supporting the most robust growth, while none of these oligosaccharides afforded meaningful growth of non-mutualists. B. longum efficiently converted HMOS, GMOS, GOS, and XOS into organic acid fermentation products, and, to a lesser degree, L. acidophilus metabolized HMOS, GMOS, and GOS. Fermentation of these glycans by C. jejuni and E. coli was sparse. B. longum fermentation products inhibited C. jejuni and E. coli. Thus, HMOS most strongly promoted growth of the two mutualists, and both HMOS and GMOS were efficiently fermented by these mutualists into organic acids. This is consistent with a primary role of HMOS in guiding early colonization of the infant microbiota by mutualist symbionts, and of plant oligosaccharides, especially GMOS, in maintaining a favorable microbiota through adulthood.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2730-0
      Issue No: Vol. 243, No. 1 (2017)
       
  • Volatile profiling of durum wheat kernels by HS–SPME/GC–MS
    • Authors: Emanuela Mattiolo; Fabio Licciardello; Grazia Maria Lombardo; Giuseppe Muratore; Umberto Anastasi
      Pages: 147 - 155
      Abstract: Abstract This work aimed at developing a HS–SPME/GC–MS method for the extraction and analysis of volatile compounds from the kernels of durum wheat. Fiber coating, temperature and time of extraction were evaluated. Moreover, the method was used as a tool for varietal characterization. The qualitative and semi-quantitative characterization of the volatile fraction of durum wheat kernels highlighted 11 different chemical classes, alcohols and aldehydes prevailing over acids, alkanes, aromatic and heterocyclic hydrocarbons. Concerning the comparison among the studied durum wheat kernel cultivars, Sculptur was the one with the highest amount and variability of volatile compounds. This cultivar stood out for the highest level of alkanes and ketones, while Anco Marzio contained higher levels of aldehydes and alkenes. The optimized method allowed for the qualitative and semi-quantitative characterization of the volatile fraction of durum wheat kernels, and it was effective at differentiating durum wheat cultivars based on their different volatile profiles, representing a potential tool for varietal selection and for the exploitation of specific durum wheat cultivars.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2731-z
      Issue No: Vol. 243, No. 1 (2017)
       
  • Selection of potential probiotic bifidobacteria and prebiotics for elderly
           by using in vitro faecal batch cultures
    • Authors: L. Valdés; N. Salazar; S. González; S. Arboleya; D. Ríos-Covián; S. Genovés; D. Ramón; C. G. de los Reyes-Gavilán; P. Ruas-Madiedo; M. Gueimonde
      Pages: 157 - 165
      Abstract: Abstract The gut microbiota plays an important role in host health. The ageing process affects this microbial community, and therefore, the use of functional foods to restore the microbiota of elderly constitutes an interesting strategy. To this end, probiotics and prebiotics targeted at correcting the specific microbiota alterations occurring during senescence are needed. We performed an in vitro selection of bifidobacterial strains and prebiotic substrates on the basis of their ability to counterbalance the specific microbiota aberrancies previously identified in the elderly population. Batch cultures of faeces from elderly were carried out adding different strains of Bifidobacterium or prebiotics. The effects of these strains/prebiotics upon gut microbiota were assessed by quantitative PCR and the concentrations of short chain fatty acids determined by gas chromatography-FID/MS. The target-specific selection process applied in this study allowed the preliminary selection of two Bifidobacterium strains and a prebiotic fructooligosaccharide on the basis of their specific properties for the modulation of the microbiota of elders. Overall, this study identifies potentially probiotic strains and prebiotic substrates for the development of functional foods specifically targeted to the senior population.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2732-y
      Issue No: Vol. 243, No. 1 (2017)
       
  • Analysis of distribution and pharmacokinetics of litchi pericarp
           procyanidins in rat plasma and organs by using liquid
           chromatography–tandem mass spectrometry
    • Authors: Qian Wu; Shuyi Li; Juan Xiao; Yong Sui; Bijun Xie; Zhida Sun
      Pages: 167 - 176
      Abstract: Abstract Litchi pericarp procyanidins (LPP), which were mainly A-types, inhibit cardiovascular disease in vivo significantly. In order to know the pharmacokinetics of LPP, procyanidin (PC) metabolites were examined in various organs of rats at different time points after LPP ingestion. Plasma, liver, kidneys, spleen, brain, together with gastrointestinal (GI) tract of rats were collected over a 24-h period. The PC metabolic product residuals were extracted and identified by HPLC-Trap-MS–MS and LC/Q-trap-MS analyses. According to the data, there were eight PC metabolites with glucuronide, sulfate, and methyl ethers detected, in which brain was the first target of (−)-epicatechin, A-type dimers, and trimer, reaching their maximum values at 0.5 h post-administration. Liver was the major organ for glucuronidated, sulfated, and methylated transform during PC metabolism. GI tract was the primary system to recover PCs. Furthermore, all the litchi pericarp flavan-3-ols and PCs were eliminated from the stomach and GI tract 24 h after administration. (−)-Epicatechin conjugates, which were detected in plasma and brain as the major PC metabolites, demonstrating that flavan-3-ols and their metabolic products can cross the blood–brain barrier. And the results were also considerably helpful for us to know that A-type PCs are bioavailable in body.
      PubDate: 2017-01-01
      DOI: 10.1007/s00217-016-2733-x
      Issue No: Vol. 243, No. 1 (2017)
       
  • Plant polyphenol content, soil fertilization and agricultural management:
           a review
    • Authors: Daniela Heimler; Annalisa Romani; Francesca Ieri
      Abstract: Abstract The review deals with polyphenol content of vegetables and fruits under different experimental conditions. The effect of fertilizers, mainly nitrogen containing fertilizers, on qualitative and especially quantitative content of the polyphenols mixture, was reviewed. Soil nitrogen affects both anthocyanins and flavonoids content, and generally, a higher polyphenolic content is observed when less nitrogen fertilizer is added to the soil. Also the effect of different agricultural management (conventional, organic, biodynamic, integrate) is reviewed with respect to polyphenols. In this case, a major effect has pointed out in the case of vegetables, while agricultural practice affects in a minimal way fruits polyphenols content. The effect of different management is, however, hardly pointed out, since many environmental factors are involved and affect polyphenols biosynthetic pathway.
      PubDate: 2017-01-07
      DOI: 10.1007/s00217-016-2826-6
       
  • Fractionation and isolation of polyphenols from Aronia melanocarpa by
           countercurrent and membrane chromatography
    • Authors: Tuba Esatbeyoglu; Miriam Rodríguez-Werner; Peter Winterhalter
      Abstract: Abstract In the current study, the fractionation and isolation of polyphenols from Aronia melanocarpa has been performed with two different chromatographic techniques on a large scale. On the one hand, the fractionation of polyphenols such as anthocyanins, phenolic acids, quercetin–glycosides and flavanons from A. melanocarpa pomace was done by high-speed countercurrent chromatography and low-speed rotary countercurrent chromatography. On the other hand, the preseparation of A. melanocarpa extracts from pomace and juice in an anthocyanin and a co-pigment fraction was carried out by membrane chromatography after removing the polymeric procyanidins by precipitation with ethanol. Afterward, the separation and isolation of anthocyanins and co-pigments were done by preparative countercurrent chromatography. Purity control and identification of the isolated compounds were made by HPLC–PDA, HPLC–ESI-MSn and 1H- as well as 13C-NMR spectroscopy. Various compounds, e.g., chlorogenic acids, isorhamnetin-, apigenin-, luteolin- and taxifolin-derivatives, are described for A. melanocarpa for the first time.
      PubDate: 2017-01-02
      DOI: 10.1007/s00217-016-2837-3
       
  • Stability of O/W emulsions packed with PLA film with incorporated rosemary
           and thyme
    • Authors: Gabriela Gallego; Minna Hakkarainen; María Pilar Almajano
      Abstract: Abstract Active packaging is a promising technology for food industry. In this study, polylactic acid (PLA) films were prepared with dry or lyophilized plants of thyme and rosemary. These plants are an abundant, inexpensive source of polyphenolic antioxidant. Oil-in-water (O/W) emulsions were made, covered by the different PLA films and stored for 30 days. The lipid oxidation was measured by peroxide value and thiobarbituric acid-reactive substances assays. The lyophilized rosemary extract (LRE) and lyophilized thyme extract used in PLA films, resulted in enhanced oxidative stability of emulsions. PLA film with LRE was the most effective to protect of O/W emulsion at 33 ± 1 °C for 20 days according to guideline by the Codex Alimentarius (<10 meq/kg), regarding the control that exceeds this value to 5 days. The prepared PLA films were characterized to determine the effect of rosemary and thyme on thermal properties and thermo-oxidative stability of the films. In addition, the migration behavior was evaluated in contact with food simulants. PLA antioxidant active packaging could reduce the need of adding antioxidants directly in food products, increasing the shelf life.
      PubDate: 2016-12-29
      DOI: 10.1007/s00217-016-2829-3
       
 
 
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