for Journals by Title or ISSN
for Articles by Keywords
help

Publisher: SciELO   (Total: 726 journals)

 A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z  

  First | 1 2 3 4 | Last   [Sort by number of followers]   [Restore default list]

Showing 401 - 600 of 726 Journals sorted alphabetically
Psicologia Escolar e Educacional     Open Access   (SJR: 0.101, h-index: 1)
Psicologia USP     Open Access   (SJR: 0.178, h-index: 4)
Psychology & Neuroscience     Open Access   (Followers: 13, SJR: 0.261, h-index: 5)
Psychology in Society     Open Access   (Followers: 2)
Psykhe (Santiago)     Open Access   (SJR: 0.29, h-index: 6)
Química Nova     Open Access   (SJR: 0.293, h-index: 41)
Radiologia Brasileira     Open Access   (Followers: 1, SJR: 0.201, h-index: 7)
RAE-eletrônica     Open Access  
RAM. Revista de Administração Mackenzie     Open Access  
RCOE     Open Access  
REAd : Revista eletrônica de administração     Open Access  
Región y Sociedad     Open Access  
Relações Internacionais (R:I)     Open Access  
Religião e Sociedade     Open Access   (Followers: 3)
Rem : Revista Escola de Minas     Open Access   (Followers: 1, SJR: 0.232, h-index: 6)
Revista Americana de Medicina Respiratoria     Open Access  
Revista Andaluza de Medicina del Deporte     Open Access   (Followers: 2, SJR: 0.148, h-index: 4)
Revista Archivo Médico de Camagüey     Open Access  
Revista Árvore     Open Access   (Followers: 1, SJR: 0.486, h-index: 15)
Revista Brasileira de Biologia     Open Access  
Revista Brasileira de Cardiologia Invasiva     Open Access   (SJR: 0.116, h-index: 5)
Revista Brasileira de Ciência Avicola     Open Access   (Followers: 1, SJR: 0.266, h-index: 9)
Revista Brasileira de Ciência do Solo     Open Access   (Followers: 1, SJR: 1.001, h-index: 29)
Revista Brasileira de Ciência Política     Open Access  
Revista Brasileira de Ciências do Esporte     Open Access   (Followers: 1)
Revista Brasileira de Ciências Farmaceuticas     Open Access  
Revista Brasileira de Ciências Sociais     Open Access   (Followers: 1, SJR: 0.163, h-index: 5)
Revista Brasileira de Cineantropometria & Desempenho Humano     Open Access   (SJR: 0.255, h-index: 10)
Revista Brasileira de Cirurgia Cardiovascular     Open Access   (SJR: 0.302, h-index: 13)
Revista Brasileira de Cirurgia Plástica     Open Access   (Followers: 1)
Revista Brasileira de Coloproctologia     Open Access  
Revista Brasileira de Economia     Open Access   (SJR: 0.277, h-index: 6)
Revista Brasileira de Educação     Open Access   (SJR: 0.274, h-index: 4)
Revista Brasileira de Educação Especial     Open Access   (SJR: 0.201, h-index: 5)
Revista Brasileira de Educação Física e Esporte     Open Access   (Followers: 1)
Revista Brasileira de Educação Medica     Open Access  
Revista Brasileira de Enfermagem     Open Access   (SJR: 0.273, h-index: 10)
Revista Brasileira de Engenharia Agrícola e Ambiental     Open Access   (Followers: 1, SJR: 0.622, h-index: 17)
Revista Brasileira de Engenharia Biomédica     Open Access   (SJR: 0.147, h-index: 2)
Revista Brasileira de Ensino de Fisica     Open Access   (SJR: 0.201, h-index: 4)
Revista Brasileira de Entomologia     Open Access   (Followers: 2, SJR: 0.446, h-index: 13)
Revista Brasileira de Epidemiologia     Open Access   (Followers: 2, SJR: 0.576, h-index: 14)
Revista Brasileira de Estudos de População     Open Access   (Followers: 1, SJR: 0.227, h-index: 5)
Revista Brasileira de Estudos Pedagógicos     Open Access  
Revista Brasileira de Farmacognosia     Open Access   (SJR: 0.371, h-index: 21)
Revista Brasileira de Fisiologia Vegetal     Open Access  
Revista Brasileira de Fruticultura     Open Access   (SJR: 0.468, h-index: 13)
Revista Brasileira de Geofísica     Open Access   (Followers: 2, SJR: 0.192, h-index: 10)
Revista Brasileira de Geriatria e Gerontologia     Open Access  
Revista Brasileira de Hematologia e Hemoterapia     Open Access   (Followers: 1, SJR: 0.148, h-index: 8)
Revista Brasileira de Historia     Open Access   (Followers: 3, SJR: 0.11, h-index: 4)
Revista Brasileira de Linguística Aplicada     Open Access  
Revista Brasileira de Medicina do Esporte     Open Access   (Followers: 1, SJR: 0.176, h-index: 14)
Revista Brasileira de Meteorologia     Open Access   (Followers: 1)
Revista Brasileira de Oftalmologia     Open Access   (SJR: 0.15, h-index: 7)
Revista Brasileira de Otorrinolaringologia     Open Access  
Revista Brasileira de Parasitologia Veterinaria     Open Access   (SJR: 0.419, h-index: 13)
Revista Brasileira de Plantas Medicinais     Open Access   (SJR: 0.226, h-index: 14)
Revista Brasileira de Política Internacional     Open Access   (SJR: 0.261, h-index: 5)
Revista Brasileira de Psiquiatria     Open Access   (Followers: 1, SJR: 0.477, h-index: 30)
Revista Brasileira de Reumatologia     Open Access   (SJR: 0.281, h-index: 13)
Revista Brasileira de Saúde e Produção Animal     Open Access   (SJR: 0.152, h-index: 2)
Revista Brasileira de Saúde Materno Infantil     Open Access   (SJR: 0.344, h-index: 13)
Revista Brasileira de Sementes     Open Access   (SJR: 0.336, h-index: 13)
Revista Brasileira de Terapia Intensiva     Open Access   (Followers: 1)
Revista Brasileira de Zoologia     Open Access  
Revista Brasileira de Zootecnia     Open Access   (Followers: 2, SJR: 0.37, h-index: 32)
Revista CEFAC     Open Access  
Revista Ceres     Open Access   (SJR: 0.202, h-index: 2)
Revista Chapingo. Serie horticultura     Open Access   (SJR: 0.125, h-index: 4)
Revista Chilena de Anatomia     Open Access  
Revista Chilena de Cardiología     Open Access  
Revista Chilena de Cirugia     Open Access   (SJR: 0.138, h-index: 5)
Revista Chilena de Derecho     Open Access   (SJR: 1.078, h-index: 3)
Revista Chilena de Derecho Privado     Open Access  
Revista Chilena de Enfermedades Respiratorias     Open Access   (SJR: 0.139, h-index: 6)
Revista Chilena de Infectología     Open Access   (SJR: 0.173, h-index: 12)
Revista Chilena de Literatura     Open Access   (Followers: 2, SJR: 0.123, h-index: 3)
Revista Chilena de Neuro-Psiquiatria     Open Access   (SJR: 0.119, h-index: 8)
Revista Chilena de Nutricion     Open Access   (Followers: 1, SJR: 0.204, h-index: 6)
Revista Chilena de Obstetricia y Ginecologia     Open Access   (Followers: 1, SJR: 0.156, h-index: 7)
Revista Chilena de Pediatria     Open Access   (SJR: 0.132, h-index: 9)
Revista Chilena de Radiologia     Open Access   (Followers: 1, SJR: 0.1, h-index: 3)
Revista Ciência Agronômica     Open Access   (SJR: 0.782, h-index: 10)
Revista Ciencias Técnicas Agropecuarias     Open Access  
Revista Científica Ciencia Médica     Open Access  
Revista Científica General José María Córdova     Open Access  
Revista Clínica de Medicina de Familia     Open Access   (Followers: 4)
Revista Clínica de Periodoncia, Implantología y Rehabilitación Oral     Open Access   (Followers: 1)
Revista Colombiana de Anestesiología     Open Access   (Followers: 2, SJR: 0.13, h-index: 3)
Revista Colombiana de Biotecnología     Open Access   (Followers: 1)
Revista Colombiana de Cirugía     Open Access  
Revista Colombiana de Educación     Open Access  
Revista Colombiana de Entomología     Open Access   (Followers: 1, SJR: 0.241, h-index: 8)
Revista Colombiana de Estadística     Open Access   (SJR: 0.274, h-index: 4)
Revista Colombiana de Matemáticas     Open Access   (Followers: 1)
Revista Colombiana de Psicología     Open Access   (SJR: 0.112, h-index: 2)
Revista Contabilidade & Finanças     Open Access  
Revista Costarricense de Cardiología     Open Access  
Revista Costarricense de Psicología     Open Access  
Revista Cubana de Anestesiología y Reanimación     Open Access   (Followers: 1)
Revista Cubana de Angiología y Cirugía Vascular     Open Access  
Revista Cubana de Cirugía     Open Access   (SJR: 0.119, h-index: 4)
Revista Cubana de Endocrinología     Open Access  
Revista Cubana de Enfermería     Open Access   (Followers: 2, SJR: 0.138, h-index: 4)
Revista Cubana de Estomatologí­a     Open Access  
Revista Cubana de Farmacia     Open Access   (Followers: 1, SJR: 0.146, h-index: 4)
Revista Cubana de Hematología, Inmunología y Hemoterapia     Open Access   (SJR: 0.119, h-index: 5)
Revista Cubana de Higiene y Epidemiología     Open Access   (SJR: 0.14, h-index: 6)
Revista Cubana de Información en Ciencias de la Salud     Open Access  
Revista Cubana de Informática Médica     Open Access  
Revista Cubana de Investigaciones Biomédicas     Open Access   (Followers: 1)
Revista Cubana de Medicina     Open Access   (Followers: 2, SJR: 0.108, h-index: 6)
Revista Cubana de Medicina General Integral     Open Access   (Followers: 1, SJR: 0.1, h-index: 9)
Revista Cubana de Medicina Militar     Open Access   (Followers: 1, SJR: 0.1, h-index: 6)
Revista Cubana de Medicina Tropical     Open Access   (SJR: 0.136, h-index: 12)
Revista Cubana de Obstetricia y Ginecología     Open Access   (SJR: 0.152, h-index: 7)
Revista Cubana de Oftalmología     Open Access   (Followers: 1)
Revista Cubana de Ortopedia y Traumatología     Open Access   (SJR: 0.1, h-index: 4)
Revista Cubana de Pediatrí­a     Open Access  
Revista Cubana de Plantas Medicinales     Open Access   (Followers: 1, SJR: 0.16, h-index: 7)
Revista Cubana de Salud Pública     Open Access   (SJR: 0.168, h-index: 6)
Revista da Educação Física : UEM     Open Access   (SJR: 0.113, h-index: 2)
Revista da Escola de Enfermagem da USP     Open Access   (Followers: 2, SJR: 0.412, h-index: 16)
Revista da Faculdade de Educação     Open Access  
Revista da Sociedade Brasileira de Fonoaudiologia     Open Access  
Revista da Sociedade Brasileira de Medicina Tropical     Open Access   (SJR: 0.497, h-index: 35)
Revista de Administração Contemporânea     Open Access  
Revista de Administração de Empresas     Open Access   (Followers: 1, SJR: 0.208, h-index: 4)
Revista de Administração Pública     Open Access   (SJR: 0.203, h-index: 6)
Revista de Análisis Económico     Open Access   (SJR: 0.127, h-index: 1)
Revista de Antropologia     Open Access   (Followers: 3, SJR: 0.101, h-index: 3)
Revista de Bioética y Derecho     Open Access  
Revista de Biología Marina y Oceanografía     Open Access   (SJR: 0.279, h-index: 14)
Revista de Biología Tropical     Open Access   (Followers: 2, SJR: 0.327, h-index: 23)
Revista de Ciencia Politica     Open Access   (Followers: 2, SJR: 0.307, h-index: 7)
Revista de Ciencia y Tecnología     Open Access  
Revista de Ciências Agrárias     Open Access  
Revista de Ciencias Médicas de Pinar del Río     Open Access  
Revista de Ciencias Sociales     Open Access  
Revista de Derecho     Open Access   (Followers: 1, SJR: 0.418, h-index: 3)
Revista de Derecho (Coquimbo)     Open Access  
Revista de Economia Contemporânea     Open Access   (SJR: 0.186, h-index: 3)
Revista de Economía del Caribe     Open Access  
Revista de Economia e Sociologia Rural     Open Access   (SJR: 0.213, h-index: 5)
Revista de Economía Institucional     Open Access   (SJR: 0.139, h-index: 2)
Revista de Economia Poli­tíca     Open Access   (SJR: 0.224, h-index: 6)
Revista de Enfermagem Referência     Open Access   (Followers: 2)
Revista de Estudios Historico-Juridicos     Open Access   (Followers: 1, SJR: 0.1, h-index: 2)
Revista de Estudios Sociales     Open Access   (Followers: 1)
Revista de Filosofia     Open Access   (SJR: 0.11, h-index: 1)
Revista de Geografía Norte Grande     Open Access   (SJR: 0.148, h-index: 5)
Revista de Gestão Costeira Integrada     Open Access  
Revista de Historia Americana y Argentina     Open Access  
Revista de Ingeniería     Open Access  
Revista de la Asociación Española de Neuropsiquiatría     Open Access  
Revista de la Ciencia del Suelo y Nutricion Vegetal     Open Access   (SJR: 0.282, h-index: 6)
Revista de la Construcción     Open Access   (SJR: 0.112, h-index: 3)
Revista de la Facultad de Derecho y Ciencias Políticas     Open Access  
Revista de la Sociedad Boliviana de Pediatría     Open Access  
Revista de la Sociedad Española de Enfermería Nefrológica     Open Access   (SJR: 0.169, h-index: 2)
Revista de la Universidad Industrial de Santander. Salud     Open Access  
Revista de Medicina Veterinaria     Open Access  
Revista de Microbiologia     Open Access   (Followers: 1)
Revista de Nefrología, Diálisis y Trasplante     Open Access   (Followers: 1)
Revista de Nutrição     Open Access   (SJR: 0.306, h-index: 22)
Revista de Odontologia da UNESP     Open Access  
Revista de Odontologia da Universidade de São Paulo     Open Access  
Revista de Osteoporosis y Metabolismo Mineral     Open Access   (Followers: 1)
Revista de Otorrinolaringología y Cirugía de Cabeza y Cuello     Open Access  
Revista de Protección Vegetal     Open Access  
Revista de Psicología del Trabajo y de las Organizaciones     Open Access   (SJR: 0.137, h-index: 2)
Revista de Psiquiatria Clínica     Open Access   (Followers: 1, SJR: 0.305, h-index: 14)
Revista de Psiquiatria do Rio Grande do Sul     Open Access   (Followers: 1, SJR: 0.215, h-index: 9)
Revista de Salud Animal     Open Access  
Revista de Salud Pública     Open Access   (Followers: 1, SJR: 0.249, h-index: 12)
Revista de Saúde Pública     Open Access   (Followers: 1, SJR: 0.807, h-index: 48)
Revista de Sociologia e Polí­tica     Open Access   (Followers: 2, SJR: 0.178, h-index: 4)
Revista Dental Press de Ortodontia e Ortopedia Facial     Open Access   (Followers: 1)
Revista Diacrítica     Open Access  
Revista Direito GV     Open Access   (Followers: 1)
Revista do Colégio Brasileiro de Cirurgiões     Open Access   (SJR: 0.209, h-index: 7)
Revista do Departamento de Psicologia. UFF     Open Access  
Revista do Hospital das Clinicas     Open Access  
Revista do Instituto de Estudos Brasileiros     Open Access  
Revista do Instituto de Medicina Tropical de São Paulo     Open Access   (SJR: 0.451, h-index: 33)
Revista Dor     Open Access  
Revista EIA     Open Access   (Followers: 1)
Revista electrónica de investigación educativa     Open Access   (Followers: 1, SJR: 0.1, h-index: 2)
Revista Española de Cirugía Oral y Maxilofacial     Open Access   (Followers: 1, SJR: 0.123, h-index: 3)
Revista Española de Enfermedades Digestivas     Open Access   (Followers: 1, SJR: 0.294, h-index: 24)
Revista Española de Salud Pública     Open Access   (SJR: 0.216, h-index: 21)
Revista Española de Sanidad Penitenciaria     Open Access   (SJR: 0.122, h-index: 1)
Revista Estudos Feministas     Open Access   (SJR: 0.233, h-index: 6)
Revista Facultad de Ciencias Económicas: Investigación y Reflexión     Open Access  
Revista Facultad de Ingenieria - Universidad de Tarapaca     Open Access  
Revista Facultad de Ingeniería Universidad de Antioquia     Open Access   (Followers: 1, SJR: 0.139, h-index: 4)
Revista Facultad de Odontología Universidad de Antioquia     Open Access  
Revista Facultad Nacional de Agronomía, Medellín     Open Access  
Revista Facultad Nacional de Salud Pública     Open Access  

  First | 1 2 3 4 | Last   [Sort by number of followers]   [Restore default list]

Journal Cover Journal of the Chilean Chemical Society
  [SJR: 0.217]   [H-I: 18]   [2 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Online) 0717-9324
   Published by SciELO Homepage  [726 journals]
  • ESSENTIAL AND FIXED OIL CHEMICAL PROFILES OF Salvia aegyptiaca
           L. FLOWERS AND SEEDS

    • Abstract: The essential oil content in the flowers of Salvia aegyptiaca growing wild in south of Iran was found to be 0.1% (v/w). The essential oil was analyzed by GC and GC-MS. Ten constituents, representing 98.7 % of the flowers essential oil were identified. The major component of S. aegyptiaca flowers essential oil was identified as octane (60.7%). The fixed oil content and fatty acid composition of the seeds were also analyzed in order to determine their potential for human or animal consumption. The oil content in these edible seeds was found to be 16.2 %. The oil was analyzed by GC and GC/MS and twenty six components identified which constituted 84.6 % of the oil. The main compounds of the seeds oil were characterized as n-dodecane (23.9%), tetradecane (15.6%) and n-decane (10.5%).
       
  • PREPARATION AND CHARACTERIZATION OF ZnO/CuO SEMICONDUCTOR AND
           

    • Abstract: Zinc oxide, an n-type semiconductor, has been used as photocatalyst for contaminated water purification by organic compounds. The addition of a p-type semiconductor as copper oxide could increase the catalytic efficiency through the p-n junction in order to decrease the electron-hole recombination. In this work, zinc and copper oxides containing 1.0, 3.0, and 5.0 % of copper were prepared by manual grinding, followed by heat treatment at 300°C during 5 h. The zinc oxide and copper oxide mixture as well as their precursors were characterized by x-ray diffraction, diffuse reflectance, scanning electron microscopy, and x-ray fluorescence. The photocatalytic efficiency was verified by the direct red 80 tetraazodye decolorization using UV radiation under pseudo-first order conditions at natural pH (7.5-8.0) and 30 °C. The highest photocatalytic activity occurred to the semiconductor containing 1.0 % copper oxide, whose decolorization rate constant was equivalent to 6.40×10-2 min-1, that is, 17.4 % larger in comparison to ZnO, 5.45×10-2 min-1.
       
  • UNDERSTANDING THE STRUCTURE, SUBSTITUENT EFFECT, NATURAL BOND ANALYSIS
           AND AROMATICITY OF OSMABENZYNE
    : A DFT STUDY

    • Abstract: The structures and properties of osmabenzyne and para-substituted osmabenzynes (X=F, Cl, Br, Me, NH2, OH, NO2, CHO, COOH) have been explored using theoretical methods. Frontier orbital analysis indicates the HOMO and LUMO are distributed on the ring carbon atoms, Os and Cl ligands. Time dependent density functional theory (TD-DFT) is used to calculate the energy, oscillatory strength and wavelength absorption maxima (λmax) of various electronic transitions and their nature within molecules. Non linear optical (NLO) behavior of title compounds is investigated by the computed value of first hyperpolarizability (βtotal).
       
  • SIMULTANEOUS DETERMINATION OF LEVODROPROPIZINE, METHYLPARABEN, AND
           PROPYLPARABEN IN ORAL CO-FORMULATED SYRUP BY RP-HPLC METHOD

    • Abstract: A selective, rapid, isocratic RP-HPLC method has been developed and validated for the simultaneous determination of the cough suppressant drug levodropropizine and its two co-formulated preservatives methylparaben and propylparaben in Levopront® syrups. The chromatographic separation was achieved on Inertsil® C18, (250 mm x 4.6mm, 5um) column using a mixture of (acetonitrile: 0.1 % triethylamine in water, pH 3.0) 50:50: (v/v), as a mobile phase with a flow rate of 1.0 ml/min, at 30° C column temperature and detector wavelength of 240 nm. All peaks were symmetrical and well resolved in a short run time. Method validation demonstrated to be selective, accurate and precise with good linearity over the concentration range of (7.5-60 μg/ml), (1.625-13 μg/ml), and (0.25-2 μg/ ml) with limits of detection and quantification of 0.502 and 1.520 μg/ml, 0.071 and 0.215 μg/ml, and 0.040 and 0.122 μg/ml for Levodropropizine, Methylparaben, and Propylparaben, respectively. Robustness against small modifications of column temperature, flow rate and pH of the mobile phase was ascertained. The developed method was successfully applied for the separation and quantification of Levodropropizine in presence of its two co-formulated preservatives in drug substances and in Levopront® oral pharmaceutical formulation; therefore it's highly suitable for routine analysis in QC labs.
       
  • A SINGLE HPLC-DAD METHOD FOR SIMULTANEOUS ANALYSIS OF PARACETAMOL,
           PHENYLEPHRINE, CAFFEINE AND LEVOCETIRIZINE IN BULK POWDER AND TABLET
           FORMULATION
    : APPLICATION TO IN-VITRO DISSOLUTION STUDIES

    • Abstract: Present work describes development and validation of HPLC-DAD method for the analysis of a complex mixture consisting phenylephrine hydrochloride (PHE), paracetamol (PAR), caffeine (CAF) and levocetirizine (LEV). Chromatographic separation was achieved using a Kinetex-C18 column involving gradient elution, the mobile phase composed of 10mM phosphate buffer (pH 3.3) and methanol. The three step gradient program started with step-1 initially with 2% (by volume) methanol and 98 % phosphate buffer (pH 3.3) for first 5 minutes. In step-2 methanol concentration changed linearly to 80% in next 12 minutes the analysis was concluded by step-3 changing methanol to 2% in next 8 minutes. The method was linear in concentration ranges of 50 to 200 % of labeled claims with r² near to 1. Developed method proved to be precise for inter and intra-day studies the %RSD values were < 2 , accuracy studies by standard addition at 80, 100 and 120% levels resulted in recoveries of standard near to 100%. The method was selective with no interferences from placebo; robustness of method was proved by no significant alteration in system suitability parameters. The LOD values for PHE, PAR, CAF and LEV were 0.13, 0.51, 0.05 and 0.05 and LOQ were 0.39, 1.53, 0.15 and 0.15 respectively. The study concluded a validated HPLC method for analysis of complex mixture consisting PHE, PAR, CAF and LEV in bulk, tablet and dissolution samples in simulated gastric fluid (SGF).
       
  • CHEMICAL COMPOSITION AND BIOLOGICAL ACTIVITIES OF DAUCUS AUREUS
           ESSENTIAL OILS FROM EASTERN ALGERIA

    • Abstract: The aim of this study was to investigate the chemical composition of the essential oils of three populations of Daucus aureus from three sites in Eastern Algeria (Setif, Constantine and Oum Elbouaghi) and to test their antibacterial and antioxidant activities. The essential oils were obtained by hydrodistillation and analyzed by GC and GC/MS. The major components were sabinene (30.6% and 36.2%), n-nonane (8.0% and 7.9%), α-pinene (5.5% and 6.3%) and 4-terpineol (4.4% and 6.0%) in D. aureus from Setif and Constantine populations essential oils, respectively; whereas, α-pinene (19.4%), β-pinene (12.0%) and p-cymene (12.2%) were the major components in Oum Elbouaghi essential oil population. The chemical compositions of D. aureus from Eastern Algeria are markedly different from those from Western Algeria, and likely represent new chemotypes. The antimicrobial activity of the essential oils was evaluated against four bacteria and one fungus, using the disc-diffusion method and minimal inhibitory concentration (MIC), whereas, the antioxidant activity of the essential oils was evaluated using the DPPH test. The results showed that the oils have an antimicrobial activity against the microorganisms tested, with minimal inhibitory concentration (MIC) values between 0.97 and 3.23 mg/mL and weaker antioxidant and DPPH radical scavenging activities were found in comparison to butylated hydroxyl toluene (BHT).
       
  • ANTIBACTERIAL AND ENZYME INHIBITION SCREENING OF SOME NEW ACETAMIDE AND
           AZOMETHINE DERIVATIVES

    • Abstract: The synthesis of poly-functional moieties as one unit has been under consideration by the synthetic chemists to search out new potent molecules. 2-Chlorobenzoic acid (1) was converted to 5-(2-chlorophenyl)-1,3,4-Oxadiazol-2-thiol (4) through a series of steps. This nucleophile was attached with different electrophiles, prepared by the reaction of aryl/alkyl amines with 2-bromoacetylbromide, in NaH/DMF to synthesize N-substituted-2-((5-(2-chlorophenyl)-1,3,4-Oxadiazol-2-yl)sulfanyl)acetamide, 7a-f. The molecule 4 was stepped to ethyl ester and carbohydrazide. The carbohydrazide was made to react with aryl carboxaldehydes in methanol to synthesize N'-substituted-2-(5-(2-chlorophenyl)-1,3,4-Oxadiazol-2-ylthio)acetohydrazide, 11a-i. The structures of all the molecules were corroborated through IR, ¹H-NMR and EI-MS spectral data. Both the series were screened for antibacterial and enzyme inhibition activity.
       
  • RECOVERY OF HYDROCHLORIC ACID FROM ION EXCHANGE PROCESSES BY REACTIVE
           ELECTRODIALYSIS

    • Abstract: The purification process of electrolytes contaminated from electrorefining consists in placing them in contact with an ion exchange resin which can function continuously due to its reconditioning with hydrchloric acid. The treatment of the resultant solution, known as elution, consists in doing a fractional distillation releasing hydrochloric acid and gaseous chlorine. The release of these represents most of the operational problems in the electrolyte treatment plant. This paper proposes an alternative to this distillation process, using a reactive electrodialysis cell and cation and anion exchange membranes.
       
  • SOLID STATE MORPHOLOGY AND SIZE TUNING OF NANOSTRUCTURED PLATINUM USING
           MACROMOLECULAR COMPLEXES

    • Abstract: The macromolecular complexes Chitosan●(PtCl2)n and PSP-co-4-PVP●(PtCl2)n, were prepared from the respective polymer and PtCl2 in metal:polymer molar ratios 1:1 and 1:5. Pyrolisis of the macromolecular complexes Chitosan●(PtCl2)n and PSP-co-4-PVP●(PtCl2)n at 800 °C under air affords cubic nanostructured Pt in the pure phase. The morphology of the pyrolityc products depends on the molar metal:polymer ratio; i.e. a "cotton" 3D shape for the 1:1 ratio and a 'foamy" 3D shape for the 1:5 ratio. On the other hand, the particle size depends on the polymer nature, obtaining Pt nanoparticles as small as 6 nm for the chitosan precursors in both molar ratio.
       
  • ESSENTIAL AND FIXED OIL CHEMICAL COMPOSITIONS OF THE SEEDS FROM THE
           ENDEMIC SPECIES Salvia Sharifii RECH. F. & ESFAND

    • Abstract: The essential oil content in the seeds of Salvia sharifii growing wild in south of Iran was found to be 0.2% (v/w). The essential oil was analyzed by GC and GC-MS. Twenty eight constituents, representing 85.0 % of the seeds essential oil were identified. The major components of the S. sharifii seeds essential oil were identified as sclareol (21.9%) and n-decane (17.3%). The fixed oil content and fatty acid composition of the seeds were also analyzed in order to determine their potential for human or animal consumption. The oil content in these edible seeds was found to be 19.9 %. The oil was analyzed by GC and GC/MS and five fatty acids identified which constituted 88.0 % of the oil. The main fatty acids of the oil were characterized as linoleic acid (39.7%) and linolenic acid (36.7%).
       
  • APPLICATION OF IONIC LIQUIDS IN THE ULTRASOUND-ASSISTED EXTRACTION OF
           ANTIMICROBIAL COMPOUNDS FROM THE BARK OF CINNAMOMUM CASSIA

    • Abstract: This study compares the chemical constituents of extracts from the bark of Cinnamomum cassia obtained with the use of ionic liquids and organic solvents, as well as investigates their antifungal and yeasticidal activity. The type of ionic liquid was found to play a significant role in this process. We found that the ionic liquid tris (2-hydroxyethyl) methylammonium methylsulfate is a most efficient extracting agent, superior to classical solvents such as ethanol, ethyl acetate, hexane, dichloromethane. The obtained extract revealed high antimicrobial activity against yeasts, fungi pathogenic for plants and bees, dermatophytes, filamentous moulds with similar potencies as the standard fungicides.
       
  • PRODUCTION OF NON-ESTER RENEWABLE DIESEL BY THE HYDROGENATION OF
           VEGETABLE OIL ON THE 15Co5Ni-10Ce / Al2O3
           CATALYST

    • Abstract: The catalysts by incipient wetness impregnation method were prepared and characterized by XRD, BET, H2-TPD, NH3 -TPD and H2-TPR analysis, and the catalyst activity was detected by WFSM-3060 high-pressure reactor. Effective double metal catalysts were produced by using y-Al2O3 as carrier and Co and Ni as activity center, and more effectiveness by using Ce to modify. The results revealed that the 15Co5Ni-10Ce catalyst was the best in producing bio-fuels. The catalyst had good thermal stability, three kinds of adsorbed sites and three kinds of acidic sites. Compared with sintering, the catalyst deactivation was due to coke deposition. The results of FT - IR, SF-3, GC and GC-MS indicated that reaction temperature is the key factor and that oil velocity is a very important factor. The optimized condition was at reaction temperature of 450°C, reaction pressure of 3.0 MPa, oil velocity of 0.1 mL/min and the gas velocity of 35 mL/min, respectively. The alkanes and alkenes content of liquid products are 50.02% and 40.03% under the optimized condition. The main products are the hydrocarbon compounds under C18. The results of GC online and trace water determination showed that the main products of oxygen in the oil are CO and CO2, and that the minor product is H2O. The importance and the economical production of the Non-ester renewable diesel from vegetable oil are presented. From the results of FT-IR, SF-3 and GC-MS, the generating mechanism of Non- ester renewable diesel was deduced.
       
  • SYNTHESIS, CHARACTERIZATION AND CRYSTAL STRUCTURE OF A POLYMERIC
           SILVER(I) COMPLEX WITH CYTOTOXIC PROPERTY

    • Abstract: A new polymeric silver(I) complex, [Ag2(L¹)2(L²)(OH2)]n, was obtained by the reaction of 3-aminopyrazine-2-carboxylic acid (HL¹), 2-amino-5-methylpyridine (L²) and silver oxide in aqueous ammonia. The complex was characterized by elemental analysis, IR spectra and single crystal X-ray determination. The smallest repeat unit contains a [Ag2(L¹)2(L²)(OH2)] moiety. The Ag···Ag distance is 7.490(2) Å. One Ag atom is coordinated by three pyrazine N and two carboxylate O atoms from four L¹ ligands, forming a square pyramidal coordination, and the other one is coordinated by one pyrazine N and one carboxylate O atoms from a L¹ ligand, one pyridine N atom from a L² ligand, and one water O atom, forming a square planar geometry. In the crystal structure of the complex, the dinuclear silver moieties are linked through L¹ ligands, to form 1D chains along the x-axis direction. The chains are further linked through intermolecular hydrogen bonds in the y- and z-axis directions, forming a 3D network. In addition, there are π···π interactions among the chains. The complex showed effective cytotoxic property on human lung cancer cell line A549.
       
  • ARSENIC STATUS AND SPECIATION IN CHICKEN HEART TISSUES

    • Abstract: This study evaluated the total and main arsenic species in chicken heart tissues. The experimental study was carried out using two sets of samples. In the first one, 30-day-old chickens were exposed to sodium arsenate, using spiked drinking water. These chickens grew normally and were killed after fifty days of arsenic exposure. The second sets were edible chickens were nonexposed to sodium arsenate for a parallel study. The total arsenic and arsenic species content in the exposed samples were at least twice those in the normal edible chicken. One important aspect is the capability of the heart tissues to preconcentrate the most toxic species, arsenite, in the exposed chicken. Arsenobetaine was also detected in fat in the non exposed chicken. This study could be a way of establishing similarities and differences with humans exposed to the same As(V) species, to ascertain whether chickens can be used in arsenic metabolism evaluation and the results extrapolated to humans.
       
  • STRUCTURAL FEATURES OF
           2-(4,5-DIPHENYL-4H-1,2,4-TRIAZOL-3-YL)THIO)-1-(3-METHYL-3-PHENYLCYCLOBUTYL)
           ETHANONE
    : X-RAY DIFFRACTION AND DFT CALCULATIONS

    • Abstract: This paper reported that the combined X-ray diffraction and DFT computational study on molecular structure of the title compound, [C27H25N3O2S]. The compound contains a cyclobutane, a triazole and three phenyl rings. The molecular geometry of the compound was brought to light by X-ray single crystal structure determination. X-ray study shows that the title compound has a weak intermolecular C-O···π interaction as well as many D-H···A and D-H···π hydrogen bonds. The initial guess on the compound was first obtained from the X-ray coordinates which were optimized by Density Functional Theory (DFT)/B3LYP method with 6-31G(d, p) and 6-31G+(d, p) as basis sets. DFT electronic structures were compared to the experimentally determined molecular structure in the solid state.
       
  • INSIGHTS INTO THE REACTION MECHANISM BETWEEN AZACYCLOPROPENYLIDENE AND
           AZACYCLOPROPANE
    : A THEORETICAL STUDY

    • Abstract: The reaction mechanism between azacyclopropenylidene and azacyclopropane has been systematically investigated employing the second-order Møller-Plesset perturbation theory (MP2) method to better understand the azacyclopropenylidene reactivity with three-membered ring compound azacyclopropane. Geometry optimization, vibrational analysis, and energy property for the involved stationary points on the potential energy surface have been calculated. For the first step of this reaction, azacyclopropenylidene can insert into azacyclopropane at its C-N bond to form a spiro intermediate IM. Through the ring-opened step at C-C bond of azacyclopropenylidene fragment, IM can transfer to product P1, which is named as pathway (1). On the other hand, through the H-transferred step and subsequent ring-opened step at C-N bond of azacyclopropenylidene fragment, IM can turn into product P2, which is named as pathway (2). From the thermodynamics viewpoint, the P2 is the dominating product. From the kinetic viewpoint, the pathway (1) of formation to P1 is primary.
       
  • INVESTIGATED THE SUPRAMOLECULAR INTERACTION OF TRAMADOL HYDROCHLORIDE
           WITH P-SULFONATED CALIX[4,6,8]ARENE

    • Abstract: In this paper, the interaction behavior of p-sulfonated calix[n]arene (SCnA) with tramadol hydrochloride was investigated by fluorescence spectra, ¹H NMR spectra, and theoretical calculations in aqueous solution. At the optimized conditions, the fluorescence intensity of tramadol hydrochloride showed positive correlation to the concentration of SCnA, which led to a validated, simple, and sensitive fluorescence quenching method for the determination of tramadol hydrochloride was established for the first time. Moreover, the interaction based on SCnA superstructure provided has promising potential for therapeutic monitoring and pharmacokinetics and clinical application
       
  • VALIDATED THIN-LAYER CHROMATOGRAPHY/DENSITOMETRY METHOD FOR THE
           ANALYSIS OF ANTI-ALZHEIMER DRUG IN BULK AND IN CAPSULE FORMULATION

    • Abstract: A simple, sensitive and precise Thin-Layer Chromatography (TLC)/ Densitometry method has been developed for estimation of Rivastigmine hydrogen tartrate [RVT] in bulk and in capsule formulation. The chromatographic separation was accomplished on aluminium backed precoated silica gel 60 F254 as the stationary phase using n- Hexane: Ethyl acetate: triethylamine (1.5: 8.5: 0.3 v/v) as mobile phase. The R F value was observed to be 0.46 ± 0.02 for RVT when the sports were analyzed densitometrically at 213 nm. The method was linear in the range of 1000 - 6000 ng band-1 with coefficient correlation value 0.9990. RVT was subjected to acid, alkali hydrolysis, oxidation, dry heat degradation and photo degradation. The degraded product peaks were well resolved from the pure drug peak with significant difference in their R F values. Analysis of drug was performed in the presence of degraded samples. The proposed method validated for linearity, accuracy, precision and robustness. The developed TLC-densitometric method can be used as an alternative method for the precise assay of rivastigmine hydrogen tartrate in capsules form because it fulfils the validation criteria of an analytical method designated for quantity control of pharmaceutical preparations.
       
  • ADSORPTION STUDIES OF POMEGRANATE PEEL ACTIVATED CHARCOAL FOR NICKEL
           (II) ION

    • Abstract: Presence of toxic heavy metals in air, soil, and water are growing threats to the environment. In this study, removal of divalent nickel from aqueous solutions has been investigated by utilizing a low cost pomegranate peel activated charcoal (PPAC) adsorbent. Adsorption capacity of the prepared charcoal at various parameters such as pH, contact time, metal ion concentration and adsorbent dose has been studied. Batch equilibrium experiments showed that maximum nickel adsorption takes place at neutral pH, while the maximum adsorption capacity for PPAC was 10.82 mg g-1. It was also found that percentage removal of nickel is directly proportional to the adsorbent dose with maximum adsorption at an adsorbent dose of 0.5g/50 ml for various concentrations (10-150 ppm) and contact time of 50 minutes. Experimental equilibrium data was verified for Langmuir and Freundlich isotherm models to establish the adsorbate-adsorbent interaction phenomena. The values of regression coefficient for Langmuir and Freundlich isotherm are found to be 0.942 and 0.931 respectively which showed that data fitted well in both models.
       
  • SYNTHESIS OF 2,3-UNSATURATED O-GLYCOSIDES FROM OPTICALLY ACTIVE
           ALCOHOLS VIA FERRIER REARRANGEMENT
    : CONFIGURATIONAL STUDIES

    • Abstract: 4-[3-(aryl)-1,2,4-oxadiazol-5-yl] butanones 4a-e have been reduced to optically active 4-[3-(aryl)-1,2,4-oxadiazol-5-yl] butanols 5a-e with baker's yeast. We subjected the alcohols possessing (S)-configuration to Ferrier' rearrangement with tri-O-acetyl-D-glucal 6 which furnished new unsaturated O-glycosides 7a-e. The crystallographic data of the glycosides 7b confirmed the (S)-configuration for the aglycone portion of the carbon atom.
       
  • DEGRADED PET FOR THE REMOVAL OF METAL IONS FROM AQUEOUS SOLUTION

    • Abstract: Poly(ethylene terephthalate) waste was degraded by glycolysis in order to obtain low molecular weight molecules for the batch removal of Cd(II), Cr(III), Cu(II), Ni(II), and Pb(II) from aqueous solution. The degradation product was characterized by IR, H¹NMR, DSC, and GPC, being identified as bis(2-hydroxy ethyl) terephthalate (BHET). The results show that metal absorption follows the order Pb(II)>Cd(II)>Ni(II)>Cu(II)>Cr(III). Degraded PET presented an affinity to remove over 75% of lead in solution at pH 4 and 5 and cadmium over 70% at pH 6. IR spectroscopy and DSC evidenced the presence of metal ions in the structure of the material.
       
  • FLAME ATOMIC ABSORPTION SPECTROMETRIC DETERMINATION OF TRACE AMOUNTS OF
           SILVER IN RADIOLOGICAL WASTE SAMPLES AFTER SOLID PHASE EXTRACTION USING
           MULTI-WALLED CARBON NANO-TUBES MODIFIED BY SODIUM DODECYL SULFATE

    • Abstract: Multi-walled carbon nano-tubes was modified with sodium dodecyl sulfate and used as a solid phase extraction adsorbent for the determination of trace silver in radiological waste samples by flame absorption spectrometry. The effects of pH, initial silver ion concentration, sample flow rate and volume, elution conditions and the amount of adsorbent on the recovery of the analyte were investigated and optimized. The results showed that silver could be fully adsorbed at pH 7.0 and eluted by 5.0 mL 2% thiourea in HNO3 (0.1 mol.L-1). Under the optimized conditions, the adsorption capacity of modified multi-walled carbon nano-tubes was found to be 3.2 mg.g-1 of silver. The detection limit of the proposed method was 350 μg. L-1 for silver with an enrichment factor of 35. The relative standard deviation for ten replicate measurement of 0.5 ug of silver from 700 mL samples was 4.7%. The analytical procedure was successfully applied to the determination of trace silver in a few radiological waste samples with the recoveries between 94% and 105%. Graphite furnace atomic absorption spectrometric technique was also used for the comparison with the suggested method for the determination of the real samples.
       
 
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-2015