for Journals by Title or ISSN
for Articles by Keywords
  Subjects -> CHEMISTRY (Total: 931 journals)
    - ANALYTICAL CHEMISTRY (58 journals)
    - CHEMISTRY (663 journals)
    - CRYSTALLOGRAPHY (21 journals)
    - ELECTROCHEMISTRY (27 journals)
    - INORGANIC CHEMISTRY (43 journals)
    - ORGANIC CHEMISTRY (48 journals)
    - PHYSICAL CHEMISTRY (71 journals)

CHEMISTRY (663 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 14)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 31)
ACS Applied Polymer Materials     Hybrid Journal  
ACS Catalysis     Hybrid Journal   (Followers: 55)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 22)
ACS Combinatorial Science     Hybrid Journal   (Followers: 21)
ACS Macro Letters     Hybrid Journal   (Followers: 29)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 46)
ACS Nano     Hybrid Journal   (Followers: 375)
ACS Photonics     Hybrid Journal   (Followers: 15)
ACS Symposium Series     Full-text available via subscription   (Followers: 1)
ACS Synthetic Biology     Hybrid Journal   (Followers: 25)
Acta Chemica Iasi     Open Access   (Followers: 6)
Acta Chimica Slovaca     Open Access   (Followers: 2)
Acta Chimica Slovenica     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 8)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 8)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 9)
Adsorption Science & Technology     Open Access   (Followers: 7)
Advanced Functional Materials     Hybrid Journal   (Followers: 64)
Advanced Science Focus     Free   (Followers: 5)
Advances in Chemical Engineering and Science     Open Access   (Followers: 88)
Advances in Chemistry     Open Access   (Followers: 28)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 20)
Advances in Drug Research     Full-text available via subscription   (Followers: 26)
Advances in Environmental Chemistry     Open Access   (Followers: 8)
Advances in Enzyme Research     Open Access   (Followers: 11)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 9)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 17)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 11)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 28)
Advances in Nanoparticles     Open Access   (Followers: 18)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Polymer Science     Hybrid Journal   (Followers: 49)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 19)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Science and Technology     Full-text available via subscription   (Followers: 13)
Aerosol Science and Engineering     Hybrid Journal  
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 5)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 8)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 3)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
Alotrop     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 71)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 22)
American Journal of Chemistry     Open Access   (Followers: 35)
American Journal of Plant Physiology     Open Access   (Followers: 13)
American Mineralogist     Hybrid Journal   (Followers: 15)
Anadolu University Journal of Science and Technology A : Applied Sciences and Engineering     Open Access  
Analyst     Full-text available via subscription   (Followers: 37)
Angewandte Chemie     Hybrid Journal   (Followers: 191)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 286)
Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 4)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 8)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 15)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 2)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 9)
Applied Spectroscopy     Full-text available via subscription   (Followers: 26)
Applied Surface Science     Hybrid Journal   (Followers: 33)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 3)
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access   (Followers: 2)
Atomization and Sprays     Full-text available via subscription   (Followers: 5)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 4)
Avances en Quimica     Open Access  
Biochemical Pharmacology     Hybrid Journal   (Followers: 11)
Biochemistry     Hybrid Journal   (Followers: 403)
Biochemistry Insights     Open Access   (Followers: 7)
Biochemistry Research International     Open Access   (Followers: 7)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 11)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 2)
Biomacromolecules     Hybrid Journal   (Followers: 25)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 6)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 183)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 92)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 17)
Biosensors     Open Access   (Followers: 3)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 25)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 12)
Canadian Mineralogist     Full-text available via subscription   (Followers: 7)
Carbohydrate Research     Hybrid Journal   (Followers: 24)
Carbon     Hybrid Journal   (Followers: 72)
Catalysis for Sustainable Energy     Open Access   (Followers: 10)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 10)
Catalysis Science and Technology     Hybrid Journal   (Followers: 10)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 14)
Cellulose     Hybrid Journal   (Followers: 14)
Cereal Chemistry     Full-text available via subscription   (Followers: 5)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 2)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 23)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 75)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 27)
Chemical Physics Letters : X     Open Access   (Followers: 2)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 23)
Chemical Reviews     Hybrid Journal   (Followers: 235)
Chemical Science     Open Access   (Followers: 33)
Chemical Technology     Open Access   (Followers: 49)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 56)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 21)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry     Open Access  
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Biology     Full-text available via subscription   (Followers: 32)
Chemistry & Industry     Full-text available via subscription   (Followers: 8)
Chemistry - A European Journal     Hybrid Journal   (Followers: 190)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 16)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry and Materials Research     Open Access   (Followers: 21)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Open Access   (Followers: 3)
Chemistry Letters     Full-text available via subscription   (Followers: 45)
Chemistry of Heterocyclic Compounds     Hybrid Journal   (Followers: 4)
Chemistry of Materials     Hybrid Journal   (Followers: 284)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 10)
Chemistry World     Full-text available via subscription   (Followers: 21)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 1)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 12)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 12)
Chromatographia     Hybrid Journal   (Followers: 22)
Chromatography     Open Access   (Followers: 3)
Chromatography Research International     Open Access   (Followers: 5)
Clay Minerals     Hybrid Journal   (Followers: 10)
Cogent Chemistry     Open Access   (Followers: 2)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 11)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 24)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Communications Chemistry     Open Access   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 8)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 1)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 2)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 13)
Computational Chemistry     Open Access   (Followers: 3)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 10)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 4)
Copernican Letters     Open Access   (Followers: 1)
Corrosion Series     Full-text available via subscription   (Followers: 7)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 8)
Croatica Chemica Acta     Open Access  
Crystal Structure Theory and Applications     Open Access   (Followers: 4)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Chromatography     Hybrid Journal  
Current Green Chemistry     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 6)
Current Microwave Chemistry     Hybrid Journal  
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 10)

        1 2 3 4 | Last

Similar Journals
Journal Cover
American Journal of Chemistry
Number of Followers: 35  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2165-8749 - ISSN (Online) 2165-8781
Published by SAP Homepage  [105 journals]
  • Synthesis of Calcium Phosphate Bioceramics Based on Snail Shells: Towards
           a Valorization of Snail Shells from Republic of Benin

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 4Sèmiyou A. Osseni, Sidoine A. S. Bonou, Etienne V. Sagbo, Raoul Ahouansou, Marielle Y. Agbahoungbata, David Neumeyer, Marc Verelst, Robert MauricotIn this study, we used Lanistes varicus and Achatina achatina snail shell powders as a calcium source for the synthesis of calcium phosphate bioceramics by using coprecipation method and microwave irradiation method. X-Rays Diffraction Analysis, Thermal Analysis (TGA), Acid-Base back titration method and FTIR analysis of the powders of the snail shells revealed that they contain more than 98% of calcium carbonate CaCO3 with aragonite as the major phase. Structural characterization and elucidation of synthesized bioceramics were done using X-Rays diffraction analysis, Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) analysis. The results have revealed that synthesized calcium phosphate bioceramics contain a mixture of Hydroxyapatite (HA: Ca10(PO4)6(OH)2) and apatitic Tricalcium Phosphate (TPa: Ca9(HPO4) (PO4)5(OH) whatever the method of synthesis. and the variety of snail shell used. The study of the antibacterial activity of synthesized bioceramics has shown that only those obtained with Lanistes varicus powder significantly inhibit the growth of Staphylococcus aureus with a lasting effect. On the other side, inhibition of growth of Klebsiella oxytoca is partial and a resistance to the antimicrobial activity of bioceramics was noticed. Thus bioceramics synthesized from Lanistes varicus snail shell powder has antibacterial property and should be used against the growth of pathogens causing dental cavities.
  • On the Mechanism of Indirubin Formation in the Baeyer-Emmerling Synthesis

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 4Francisco Sánchez-Viesca, Reina GómezIndigo red, the co-product formed in the Baeyer-Emmerling indigo synthesis, has been synthesized by two different methods. One is from Baeyer and the other is due to Wahl. The last procedure has been improved afterwards. However, both methods employ reactants that are absent in the Baeyer-Emmerling synthesis. Thus, the way by which indirubin (indigo red) is formed in the reaction medium of the original synthesis is unknown. We have cleared this and also why this co-product is always present in this synthesis. Baeyer intended a regioselective synthesis of indigo blue, but many years later biological activity was found in the co-product and now this important compound is used in cancer treatment.
  • Synthesis and Characterization of Novel Glassy Titanium-, Zirconium
           Tellurates-Fibrous Cerium Phosphate/ Polyaniline, Polyindole, Polypyrrole,
           Polyaniline-co-Polyindole, Polyaniline-co-Polypyrrole Nanocomposite

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 3S. K. Shakshooki, M. B. Hassan, Ibtihal M. AbdullahGlassy titanium tellurate, TiO(HTeO4)2.3.99H2O (TiTe), Glassy zirconium tellurate, ZrO(HTeO4)2. 3.35H2O (ZrTe) and nano fibrous cerium phosphate, Ce(HPO4)2.2.9H2O(nCePf), were prepared and characterized by chemical, XRD, TGA, FT-IR and SEM. Mixing slurry aqueous solutions of TiTe-, ZrTe with slurry aqueous solution of nCePf (in 25:75 wt/wt% mixing ratios), respectively, lead to formation of novel titanium tellurate/ fibrous cerium phosphate, zirconium tellurate/fibrous cerium phosphate nanocomposite membranes, [TiO(HTeO4)2]0.25[Ce(HPO4)2]0.75 .1.75 H2O, (TiTe-nCePf), and [ZrO(HTeO4)2]0.25 [Ce(HPO4)2], respectively. They were characterized by XRD TGA and FT-IR. Their /polyaniline-, polyindole-, polypyrrole-, polyaniline–co-polyindole-, polyaniline-co-polypyrrole nanocomposite membranes were prepared via in-situ chemical oxidation of the monomers aniline, indole, pyrrole and (1:1moler ratio) of co-monomers aniline-indole, aniline- pyrrole, respectively, that was promoted by the reduction of Ce(iv) ions present in the inorganic matrix of (TiTe-nCePf and ZrTe-nCePf) nanocomposite membranes, respectively. A possible explanation is nCePf present on the surface of the fibrous cerium phosphate membrane is attacked by the monomers, and the co-monomers, respectively, converted to cerium (III) orthophosphate (CePO4). The resultant materials were characterized by elemental (C,H,N) analysis, FT-IR, and scanning electron microscopy(SEM). From elemental (C,H,N) analysis the amount of organic materials present in (TiTe-nCePf)/polyaniline-, polyindole-, polypyrrole composites were (14.88, 11.87, 10.73% in wt), respectively. The amount of organic materials present in (ZrTe-nCePf)/Polyaniline-, polyindole-, polypyrrole composites (22.8, 5.52, 7.58% in Wt), respectively. Organic material present in composite (TiTe-nCePf)/ polyaniline-co-polyindole were (Pani 9.92, PIn 10.43% in wt). Amount of organic material in composite (TiTe-nCePf)/ polyaniline-co-polypyrrole were (Pani 9.55, PPy 5.1% in wt). Amount of organic materials in composite (ZrTe-nCePf)/ polyaniline-co-polyindole were (Pani 7.15, PIn 10.76% in wt), for composite (ZrTe-nCePf)/ polyaniline-co-polypyrrole (Pani 16.24, PPy 4.68% in wt). These composites can be considered as novel conducting inorganic-organic composites, ion exchangers, solid acid catalysts and sensors.
  • Preparation of Sulphide-lime Unhairing Ratios for Pollution Load Reduction
           in the Manufacture of Shoe Upper Leathers from Tropical Goat Skins

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 3Tanko S. F., Ajibola V. O., Agbaji E. B., Idris S. O., Putshaka J. D., Amana B. S.Preparation of sulphide-lime unhairing tannery process was carried out using nine ratios coded as AI – AIII; BI - BIII and CI – CIII with varied concentrations of sodium sulphide and hydrated lime. Result obtained through subjective tests and gravimetric method show differences in degree of unhairing, swelling and plumping of the pelts. The pH of wastewater generated from each ratio and weight increase of limed pelts, was observed and recorded. Analysis of pollutants from the wastewater was determined by parameters such as BOD, COD, and Sulphide generated from the wastewater. Results obtained show various levels of parameters from the studied ratios indicated that A-group had poor unhairing and liming properties. The C-group gave excellent properties but with higher pollution load. However, BII (2.5% Na2S with 2.0% Ca(OH)2) and BIII (2.8% Na2S with 2.5% Ca(OH)2) in 200% float generated lower pollution level as determined by the parameters from their individual wastewaters. This was compared with the conventional (CTL) and that of the industry. The average sample wastewater collected from the industry indicated higher pollutants than the studied and CTL ratios. The study reveals that maximum utilization of reagents is a necessary technique for reduction of pollutants in the wastewater from sulphide-lime unhairing process known to generate 65%-70% of pollutants from the beam-house.
  • Lactic Acid Production from Sisal Boles Juice by Lactobacillus Delbrueckii
           Sp. Delbrueckii

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 3N. Msuya, J. H. Y. Katima, E. Masanja, R. J. A. Minja, A. K. TemuThe use of different concentrations of sugar from sisal boles juice for production of Lactic acid (LA) using Lactic Acid Bacteria (LAB) has been studied with the intention of analysing the effect of initial sugar concentration, process temperature and initial medium pH on the produced lactic acid concentration, yield and productivity. All the linear variables (initial sugar conc., pH and temperature), two way and three way interactions were statistically significant for LA yield at p-values of less than 0.05 with correlation coefficient of 0.997. There was no significant effect on LA productivity of three way interactions (Temp.*pH*Initial Conc.). Maximum condition for production of LA occurred at a temperature of 37°C, initial pH of 6 and initial sugar concentration of 120 g/L which corresponded with the highest LA concentration of more than 24 g/Land a yield of 93%. This study shows that sisal boles juice has potential to produce LA.
  • Cloud Point Extraction Using BBTSC Reagent for Pre-concentration and
           Determination of Zinc in Some Environmental Water Samples by Flame Atomic
           Absorption Spectrometry

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 2Rehab E. Babiker, Mohamed A-Z EltayebA simple and convenient method based on cloud point extraction was proposed for the determination of zinc. The extraction was carried out in the presence of benzilbis (thiosemicarbazone) (BBTSC) as complexing agents and octylphenoxypolyethoxyethanol (TritonX-114) as the non – ionic surfactant. The factors affecting the cloud point extraction were optimized. Under the optimum conditions, the calibration graph was linear in the range of (0.25 – 2.00 μg ml-1) with a detection limit of 0.095µ The relative standard deviation for 7 replicates of 0.5 µg ml-1 Zn(II) was 1.602%. The stoichiometry was 1:1, Zn (II): BBTSC. The method was applied to the determination of Zn(II) in various water samples with satisfactory results. The preconcentration factor for Zn(II) calculated by dividing the aqueous phase volume by the final volume of diluted surfactant rich phase was 20.
  • Thermal-Acid Hydrolysis of Sisal Boles Juice for Lactic Acid Production

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 2N. Msuya, J. H. Y. Katima, R. J. A. Minja, E. Masanja, A. K. TemuThe effect of reaction temperature, time and pH on the maximum total sugar concentration during thermal-acid hydrolysis of sisal boles juice was investigated. The Minitab software (V. 17) was used to design a 2n full factorial design for sisal juice hydrolysis and analyse the effects of the variables on the response. Thermal-acid hydrolysis can be carried out at a moderate temperature of 60°C with a concentrated hydrochloric acid at pH of one within a period of 30 minutes to achieve a sugar yield of 39%. The breakdown of complex sugars to simple sugars of sisal bole juice is basically a function of acid concentration in sugar solution. Lowering pH of the juice contributed to increase in hydrolysis rate. The use of ANOVA analyses gave evidence that linear, 2- way interactions and 3-way interactions of all the variables: temperature (60-100°C), time (30-60 min) and pH (1-5) significantly affected the sugar yield. This amount of sugar yield from sisal boles juice is higher than the yield of 26% which has been reported. The hydrolysed juice was also subjected into fermentation for lactic acid and results showed favourable LA yield was obtained with the recommended thermal-acid hydrolysis in this study.
  • Physicochemical and Enzymatic Hydrolysis of Eichhornia crassipes for the
           Production of Second-Generation Bioethanol

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 2Cosme Sagbo Kouwanou, Cokou P. Agbangnan Dossa, Euloge S. Adjou, Fidèle P. Tchobo, Clément Bonou, Mohamed M. Soumanou, Dominique C. K. SohounhlouéEichhornia crassipes is one of the aquatic plants that creates enormous annoyances because of its propensity to completely cover the surface of the water it colonizes, hence its negative impact on navigation, irrigation, fishing and the conservation of biodiversity. The aim of this work is its valorization by producing bioethanol of second generation; it is an optimal valorization for the production of simple fermentable sugars with high added value. In the first process which is chemical hydrolysis, the biomass was depolymerized by steam treatment. Then a second process which is enzymatic hydrolys is with Aspergillus Niger cellulase. The monitoring of kinetic parameters such as Brix, pH and glucose level showed a considerable evolution of the glucose level from 0.5 to 11.21 mg/ml according to the pretreatment time and from 11.21 to 21.46 mg/mL after the enzymatic hydrolysis according to the type of hydrolysed sample. In conclusion, this work allowed to show the impact of the thermomechanical and biotechnological processes used on the lignocellulosic biomass and to set up a time of pretreatment by steam explosion and an optimal concentration of cellulase applied to Eichhornia crassipes for its bioconversion in ethanol fuel.
  • Characterization of Sisal Boles for Production of Polylactic Acid (PLA)

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 2N. Msuya, J. H. Y. Katima, R. J. A. Minja, E. Masanja, A. K. TemuBiobased biodegradable plastics (bioplastics) show a large range of properties which can compete with non-biodegradable thermoplastics in packaging, textile and biomedical applications. Polylactic acid (PLA) is one of the most promising bioplastics, which are synthesized by polymerization of Lactic Acid (LA). Traditionally LA is produced from pure sugars and food crop sources like potatoes, cassava, corn, wheat, rice, sugar beet, sugar cane, and others. However, because of competition with existing uses, alternatives raw materials are being researched. One such alternative is the sisal boles. Sisal bole is part of the 98% of the sisal biomass which is traditionally counted as waste. Sisal boles as raw material for PLA are advantageous since it is not competing with food. This work characterizes sisal boles juice and its potential to produce biodegradable plastics. The sisal boles juice was extracted from chopped autoclaved boles using a hydraulic pressing machine. The juice was hydrolyzed to allow the sugar polymers to break into monomer sugar. The boles have been found to comprise of up to 97.94% (w/v) organic matters and total sugar content in juice of up to 30% (w/v). The produced juice mineral content levels were within the recommended working fermentation range with necessary nutrients for LA producing microorganisms. Sisal boles can therefore be one of the good raw materials for lactic acid production.
  • Adsorption of Copper (II) Ions from Aqueous Solutions by Using Natural
           Saponins-Clay Modified Materials: Isotherm, Kinetic and Thermodynamics

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 2Nguemtchouin Mbouga Marie Goletti, Kaptso Kuaté Giscard, Noumi Guy Bertrand, Noudem Jean Antoine, Allou Guy YanickIn this work, batch adsorption experiments were carried out for the removal of copper (II) ions as pollutants, from aqueous solutions using montmorillonite clay as the low-cost adsorbent. Montmorillonite clay was used in its natural form as well as after treatment with saponins extracted from kernels of Balanites aegyptiaca. The modification of the montmorillonite by the saponins was done in four proportions, whose adsorption studies on the copper ions by various parameters showed that the most balanced treatment ratio is 5:1 (clay mass/saponins mass). The contact time, adsorbent dosage, pH and temperature were investigated. Results revealed that adsorption rate initially increased rapidly, and the optimal removal efficiency was reached within 40 min for the natural-clay and 12 min for the saponins-clay material. The adsorption capacity of the two clay samples decreases with increasing temperature, pH of the reaction medium, the initial dose of clay, and the initial concentration. Thus, the combination of adsorption parameters producing the most efficient result can be characterized by ambient temperature values (25°C); of neutral pH (for MMT-HS and MMT-SP respectively). The adsorption process obeys both Langmuir and Freundlich adsorption isotherms for the two samples. All these results have shown that the modification of clay with saponins increases the adsorption capacity of the clay, with Qmax(MMT-HS)=91.77 mg.g-1 against Qmax(MMT-SP)=129.02 mg.g-1. The results indicate that the use of saponins-clay materials could provide a cheap and technically viable option for heavy metals removal from polluted water.
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
Home (Search)
Subjects A-Z
Publishers A-Z
Your IP address:
About JournalTOCs
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-