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International Journal of Carbohydrate Chemistry最新文献

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New 1,2,3-Triazole Iminosugars Derivatives Using Click Chemistry 新的1,2,3-三唑亚糖衍生物的点击化学研究
International Journal of Carbohydrate Chemistry Pub Date : 2012-12-12 DOI: 10.1155/2012/394574
Chahrazed Benhaoua
{"title":"New 1,2,3-Triazole Iminosugars Derivatives Using Click Chemistry","authors":"Chahrazed Benhaoua","doi":"10.1155/2012/394574","DOIUrl":"https://doi.org/10.1155/2012/394574","url":null,"abstract":"The click concept refers ease, efficient, and the selective chemicals transformations. In this study, a novel regiospecific copper (I)-catalyzed 1, 3-dipolar of terminal alkynes to azide provided a practicable synthetic pathway of triazole iminosugars derivatives. A series of new triazole-pyrrolidinols are reported in good yield.","PeriodicalId":13788,"journal":{"name":"International Journal of Carbohydrate Chemistry","volume":"4 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2012-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78997378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Thermal and Photoresponsive Studies of Starch Modified with 2-(5-(4-Dimethylamino-benzylidine)-4-oxo- 2-thioxo-thiazolidin-3-yl)acetic Acid 2-(5-(4-二甲氨基苄基)-4-氧- 2-硫氧-噻唑烷-3-基)乙酸改性淀粉的热和光响应研究
International Journal of Carbohydrate Chemistry Pub Date : 2012-12-09 DOI: 10.1155/2012/356563
A. Chandran, Sunny Kuriakose, Tessymol Mathew
{"title":"Thermal and Photoresponsive Studies of Starch Modified with 2-(5-(4-Dimethylamino-benzylidine)-4-oxo- 2-thioxo-thiazolidin-3-yl)acetic Acid","authors":"A. Chandran, Sunny Kuriakose, Tessymol Mathew","doi":"10.1155/2012/356563","DOIUrl":"https://doi.org/10.1155/2012/356563","url":null,"abstract":"The present study describes the synthesis of a chromophoric system 2-(5-(4-dimethylamino-benzylidin)-4-oxo-2-thioxo-thiazolidin-3-yl)acetic acid and its incorporation into starch through esterification of the hydroxyl group by the free carboxyl function of the chromophoric system by DCC coupling. The products were characterized by UV-visible, fluorescence, FT-IR, and NMR spectroscopic methods. The newly developed system was subjected to photoresponsive studies such as light absorption, light stabilization and fluorescence emission. The free chromophoric system and the coupled product were also subjected to thermal analysis. The results show that modification enhances the light absorption and light fastening properties of the chromophoric system. Thermal stability of the polymeric system greatly enhances on attaching the chromophoric system. In view of these results the newly developed system is proposed as a nature friendly, green, and photoactive product which could find application in dyes, inks, paints, and so forth.","PeriodicalId":13788,"journal":{"name":"International Journal of Carbohydrate Chemistry","volume":"8 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2012-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84294412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Scanning Electron Microscopy and Kinetic Studies of Ketene-Acetylated Wood/Cellulose High-Density Polyethylene Blends 乙烯烯-乙酰化木材/纤维素高密度聚乙烯共混物的扫描电镜及动力学研究
International Journal of Carbohydrate Chemistry Pub Date : 2012-11-29 DOI: 10.1155/2012/456491
Y. Azeh, G. Olatunji, P. Mamza
{"title":"Scanning Electron Microscopy and Kinetic Studies of Ketene-Acetylated Wood/Cellulose High-Density Polyethylene Blends","authors":"Y. Azeh, G. Olatunji, P. Mamza","doi":"10.1155/2012/456491","DOIUrl":"https://doi.org/10.1155/2012/456491","url":null,"abstract":"Acetylated cellulose and wood cellulose as well as untreated cellulose polyethylene blends were subjected to kinetic studies using water, 0.5 M NaOH, and 0.5 M HCl solutions in order to investigate their absorbent properties at 0.5/1.0 cellulose/wood cellulose/polyethylene matrix. The results of the absorption studies showed that the untreated cellulose and wood cellulose blends absorbed water and the acid and alkali solutions higher than the treated samples, which showed a reduction in acid, alkali, and water uptake. In this work, the effects of acetylation on the morphological studies of the polyethylene blends were obvious. The presence of acetyl groups improved the interfacial bonding between the polymer matrix and cellulose as well as the wood cellulose fibers, as evidenced by scanning electron microscopy (SEM).","PeriodicalId":13788,"journal":{"name":"International Journal of Carbohydrate Chemistry","volume":"161 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2012-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73800830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
The Study of the Reaction of Pectin-Ag(0) Nanocomposites Formation 果胶-银(0)纳米复合材料形成反应的研究
International Journal of Carbohydrate Chemistry Pub Date : 2012-11-21 DOI: 10.1155/2012/459410
N. Ivanova, N. N. Trofimova, L. A. Es’kova, V. Babkin
{"title":"The Study of the Reaction of Pectin-Ag(0) Nanocomposites Formation","authors":"N. Ivanova, N. N. Trofimova, L. A. Es’kova, V. Babkin","doi":"10.1155/2012/459410","DOIUrl":"https://doi.org/10.1155/2012/459410","url":null,"abstract":"Pectin polysaccharides (PSs) were isolated from a bark of Larix sibirica Ledeb. Structure of PS fragments determined by chemical transformations, chromatography, and spectroscopic analyses was found to be a linear galacturonane comprising 1,4-linked α-D-GalpA residues and a rhamnogalacturonan I (RG-I). The fifth part of galacturonane residues was methyl esterified at at C-2 and/or C-3 and C-6 atoms. Some of RG-I side chains were identified as arabinogalactan subunits with highly branched structure consisting of linear backbone with3,6)-β-D-Galp-(1residues, substituted at C-6 by neutral side chains. This side chains contained2,5)-α-L-Araf-(1and3,5)-α-L-Araf-(1residues and terminal arabinose in the pyranose and furanose form. \u0000It was found that “pectin-Ag(0)” nanobiocomposites were formed via the interaction between PS aqueous solutions and silver nitrate, with PS playing both reducing and stabilizing functions. It was shown that the content of Ag(0) particles in “pectin-Ag(0)” depended on the reaction conditions and can range from 0.1 to 72 %, the size of Ag(0) particles being 3–27 nm. Using 13C NMR technique, it was revealed that PS underwent destructive changes and they they were more considerable, more than the lot of Ag(I) that was inputed into the reactionary medium.","PeriodicalId":13788,"journal":{"name":"International Journal of Carbohydrate Chemistry","volume":"15 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2012-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84920089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
Miscibility Studies of Hydroxypropyl Cellulose/Poly(Ethylene Glycol) in Dilute Solutions and Solid State 羟丙基纤维素/聚乙二醇在稀溶液和固态中的混溶性研究
International Journal of Carbohydrate Chemistry Pub Date : 2012-09-26 DOI: 10.1155/2012/906389
K. Sudharsan Reddy, M. Prabhakar, P. Kumara Babu, G. Venkatesulu, U. Sajan Kumarji Rao, K. Chowdoji Rao, M. Subha
{"title":"Miscibility Studies of Hydroxypropyl Cellulose/Poly(Ethylene Glycol) in Dilute Solutions and Solid State","authors":"K. Sudharsan Reddy, M. Prabhakar, P. Kumara Babu, G. Venkatesulu, U. Sajan Kumarji Rao, K. Chowdoji Rao, M. Subha","doi":"10.1155/2012/906389","DOIUrl":"https://doi.org/10.1155/2012/906389","url":null,"abstract":"The miscibility of Hydroxypropyl cellulose (HPC)/poly(ethylene glycol) (PEG) blends over an extended range of concentrations in water. The viscosity, ultrasonic velocity, and refractive index of the above blend solutions have been measured at 30°C. The interaction parameters such as and μ proposed by Chee and α proposed by Sun have been obtained using the viscosity data to probe the miscibility of the polymer blends. The values indicated that the blends were miscible when HPC content is more than 40% in the blend. The obtained results have been confirmed by the ultrasonic velocity and refractive index studies. The films of the blends were prepared by solution casting method using water as a solvent. The prepared films have been characterized by analytical techniques such as FTIR, DSC, X-RD, and SEM to probe the miscibility of HPC/PEG blends. The compatibility in the above compositions may be due to the formation of H-bonding between hydroxyl groups of HPC and etheric oxygen atom of PEG molecules.","PeriodicalId":13788,"journal":{"name":"International Journal of Carbohydrate Chemistry","volume":"298 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2012-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89023680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 25
Synthesis and Characterization of Graft Copolymer of Dextran and 2-Acrylamido-2-methylpropane Sulphonic Acid 右旋糖酐与2-丙烯酰胺-2-甲基丙烷磺酸接枝共聚物的合成及表征
International Journal of Carbohydrate Chemistry Pub Date : 2012-09-02 DOI: 10.1155/2012/209085
Venkanna Azmeera, P. Adhikary, S. Krishnamoorthi
{"title":"Synthesis and Characterization of Graft Copolymer of Dextran and 2-Acrylamido-2-methylpropane Sulphonic Acid","authors":"Venkanna Azmeera, P. Adhikary, S. Krishnamoorthi","doi":"10.1155/2012/209085","DOIUrl":"https://doi.org/10.1155/2012/209085","url":null,"abstract":"A novel biodegradable graft copolymer of dextran (Dx) and 2-acrylamido-2-methyl-1-propane sulphonic acid (AMPS) was synthesized by grafting poly-AMPS chains onto dextran backbone by free radical polymerization using ceric ammonium nitrate (CAN) as an initiator. Different amounts of AMPS were used to synthesize four different grades of graft copolymers with different side chain lengths. These grafted polymers were characterized by elemental analysis, FTIR, 1HNMR, rheological technique, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and X-ray diffractometry (XRD). They exhibited efficient flocculation performance in kaolin suspension.","PeriodicalId":13788,"journal":{"name":"International Journal of Carbohydrate Chemistry","volume":"58 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2012-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91046348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 59
Partial Chemical Characterization of Immunomodulatory Polysaccharides from Plantago palmata Hook. f. s. Leaves 掌车前草免疫调节多糖的部分化学性质。f.树叶
International Journal of Carbohydrate Chemistry Pub Date : 2012-08-09 DOI: 10.1155/2012/458456
G. Biringanine, Moustapha Ouédraogo, B. Vray, A. B. Samuelsen, P. Duez
{"title":"Partial Chemical Characterization of Immunomodulatory Polysaccharides from Plantago palmata Hook. f. s. Leaves","authors":"G. Biringanine, Moustapha Ouédraogo, B. Vray, A. B. Samuelsen, P. Duez","doi":"10.1155/2012/458456","DOIUrl":"https://doi.org/10.1155/2012/458456","url":null,"abstract":"A previous work on Plantago palmata polysaccharides (PS) attributed immunomodulatory properties of leaves to a polysaccharide fraction (PS50) that stimulated NO and TNF-α production by interferon gamma- (IFN-γ-) activated macrophages. The present work aims to elucidate the chemical structure of these immunomodulatory polysaccharides. Size exclusion chromatography showed that the active polymers present an active fraction with a very high molecular weight (about 1200 kDa). These polysaccharides are pectic in nature, with a predominantly unbranched galacturonan domain and with a domain bearing side chains that consist of highly branched arabinan, galactan, and/or arabinogalactan. Comparatively to the well-known Plantago major biologically active PS, Plantago palmata PS50 contained less arabinogalactan-proteins (AGPs) and had a different composition in glucose, galactose, and galacturonic acid. DNA contamination of the polysaccharide was estimated at about 0.04%, a concentration much lower than those reported immunomodulatory in hyaluronic acid preparations (3 to 15%). Therefore, the eventuality of a contaminating DNA-mediated biological activity could be ruled out.","PeriodicalId":13788,"journal":{"name":"International Journal of Carbohydrate Chemistry","volume":"15 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2012-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76955375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
A New Rapid and Sensitive Spectrophotometric Method for Determination of a Biopolymer Chitosan 一种快速灵敏分光光度法测定生物聚合物壳聚糖的新方法
International Journal of Carbohydrate Chemistry Pub Date : 2012-07-26 DOI: 10.1155/2012/139328
M. Badawy
{"title":"A New Rapid and Sensitive Spectrophotometric Method for Determination of a Biopolymer Chitosan","authors":"M. Badawy","doi":"10.1155/2012/139328","DOIUrl":"https://doi.org/10.1155/2012/139328","url":null,"abstract":"A novel approach of spectrophotometric quantification of chitosan based on one-step depolymerization with sodium nitrite followed by reaction of the end product with thiobarbituric acid has been proposed, optimized, and validated. In this process, chitosan is converted into 2,5-anhydro-D-mannose that reacts with thiobarbituric acid to form pink color. The color that resulted from the reaction was stabilized and measured at 555 nm. The method optimization was essential as many procedural parameters influenced the accuracy of the determination including hydrolysis conditions, thiobarbituric acid concentration, reaction time, pH, reaction temperature, and color stability period. Under given optimized conditions that appeared to be critical, chitosan was quantitatively analyzed and the calibration graph was linear over the range of 10–50  μg/mL ( 𝑟 2 = 0 . 9 9 9 ). This approach was applied for determination of chitosan in pharmaceutical formulation (chitocal) and had a recovery rate of higher than 96%. The developed method is easy to use and highly accurate.","PeriodicalId":13788,"journal":{"name":"International Journal of Carbohydrate Chemistry","volume":"151 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2012-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75050514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 25
Application of bioactive coatings based on chitosan for soybean seed protection. 壳聚糖生物活性包衣在大豆种子保护中的应用。
International Journal of Carbohydrate Chemistry Pub Date : 2012-05-31 DOI: 10.1155/2012/104565
D. Zeng, Xinrong Luo, R. Tu
{"title":"Application of bioactive coatings based on chitosan for soybean seed protection.","authors":"D. Zeng, Xinrong Luo, R. Tu","doi":"10.1155/2012/104565","DOIUrl":"https://doi.org/10.1155/2012/104565","url":null,"abstract":"Soybean seeds suffer attacks of various pests that result in a decreased yield in northeastern China. Until recently, people use pesticides such as insecticides to achieve the goal of controlling pests. Chitosan extracted from deacetylation of chitin is promising candidates as a seed-coating agent to control agrotis ypsilon, soybean pod borer, and soybean aphid effectively. An experimental study on influences of chitosan with different concentrations on pest controlling and soybean growth was made in the paper. Coating based on chitosan was used as a feeding deterrent and for enhancing the germination and quality of soybean seeds. Results indicated that all chitosan coating had a significant effect on antifeeding against pests; with the increasing concentration, antifeedant rate (AR) were increased obviously, especially when in the concentration of 5%, santifeedant rate of agrotis ypsilon, soybean pod borer, and soybean aphid reached 82.89%, 87.24%, and 80.21%, respectively. Also chitosan coating increased seed germination, plant growth, and soybean yield efficiently, especially when, in the concentration of 5%, the yield was increased by about 20% compared with CK. The application of chitosan in soybean seed coated is an appropriate option to control pests replacing high-toxicity pesticides and enhance soybean yield.","PeriodicalId":13788,"journal":{"name":"International Journal of Carbohydrate Chemistry","volume":"12 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2012-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89860017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 110
Preparation and Characterization of Chitosan/Zinc Oxide Nanoparticles for Imparting Antimicrobial and UV Protection to Cotton Fabric 壳聚糖/氧化锌纳米颗粒对棉织物抗菌和防紫外线性能的研究
International Journal of Carbohydrate Chemistry Pub Date : 2012-05-14 DOI: 10.1155/2012/840591
M. Abdelhady
{"title":"Preparation and Characterization of Chitosan/Zinc Oxide Nanoparticles for Imparting Antimicrobial and UV Protection to Cotton Fabric","authors":"M. Abdelhady","doi":"10.1155/2012/840591","DOIUrl":"https://doi.org/10.1155/2012/840591","url":null,"abstract":"Synthesis of chitosan/ZnO nanoparticles was performed using different concentrations of ZnO at different temperatures. Nanoparticles of ZnO/chitosan were prepared in rod form with average length 60 nm and average width 5–15 nm. Thus, obtained nanoparticles of ZnO/chitosan were characterized using UV spectrophotometer, FTIR, TEM, X-ray, and SEM. Size and shape of chitosan/ZnO nanoparticles relied on conditions of their synthesis. Notably, chitosan/ZnO in rod form with average length of 60 nm and average width 5–15 nm could be achieved. Application of chitosan/ZnO nanoparticles to cotton fabric conferred on the latter antibacterial and UV protection properties. Cotton fabric was characterized using SEM, ultraviolet protection factor (UPF) rating, and antibacterial (gram-positive and gram-negative) characteristics. Finished cotton fabric exhibited good antibacterial properties against gram-positive and gram-negative bacteria. The UV testes indicated a significant improvement in UV protection of finished cotton fabric which is increasing by increasing the concentration of nanoparticles of ZnO/chitosan.","PeriodicalId":13788,"journal":{"name":"International Journal of Carbohydrate Chemistry","volume":"31 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2012-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74667946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 271
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