Influence of amide content on the crystal structure of chitin
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Hiroshi Tamura
Abstract
The crystalline structure of chitin and chitosan was investigated by X-ray diffraction (XRD). Chitosan filaments were prepared using a saturated solution of calcium chloride dihydrate in methanol (CaCl2-MeOH) as a mild solvent and the study focused on the interaction between the degree of acetylation (DA) and crystallinity. There were pronounced differences in the XRD patterns for specimens with DA values between 44.2% and 52.2%. We suggest that the crystalline structure changes from an anhydrous-type chitosan to an α-chitin type without any additives. CaCl2-MeOH is a good solvent for chitin and a poor solvent for chitosan and we found that it can regulate the distribution of N-acetyl glucosamine and glucosamine between amorphous and crystalline regions.
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©2006 by Walter de Gruyter Berlin New York
Artikel in diesem Heft
- A report from the 2005 Japanese-European Workshop on “Cellulose and Functional Polysaccharides”
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Artikel in diesem Heft
- A report from the 2005 Japanese-European Workshop on “Cellulose and Functional Polysaccharides”
- Determination of substituent distribution of viscoses by GPC
- Direct investigation of the structural properties of tension wood cellulose microfibrils using microbeam X-ray fibre diffraction
- Influence of amide content on the crystal structure of chitin
- Stepwise synthesis of chitooligosaccharides through a transition-state analogue substrate catalyzed by mutants of chitinase A1 from Bacillus circulans WL-12
- Synthesis of plantamajoside, a bioactive dihydroxyphenylethyl glycoside from Plantago major L.
- Diffusion of sulfide into Southern pine (Pinus taeda L.) and sweetgum (Liquidambar styraciflua L.) particles and chips
- Laccase-catalysed functionalisation of TMP with tyramine
- Wood liquefaction by ionic liquids
- Studies on the dehydrogenative polymerizations of monolignol β-glycosides. Part 2: Horseradish peroxidase-catalyzed dehydrogenative polymerization of isoconiferin
- Phenolic compounds in silver birch (Betula pendula Roth) wood
- Analysis of fragrance compositions of precious coniferous woods grown in Taiwan
- Influences of hot pressing temperature and surface structure on VOC emissions from OSB made of Scots pine
- Dimensional stability and photostability of octanoylated wood
- Measurement of the shear modulus of wood by the square-plate twist method
- Dielectric relaxation of water adsorbed on chemically treated woods
- Influences of drying on internal checking of spruce (Picea abies L.) heat-treated at 212°C
- The role of resol fortifiers in latex wood adhesives
- A simple anisotropy correction procedure for acoustic wood tomography
- Evaluating growth strain of Eucalyptus globulus Labill. from SilviScan measurements
- Density assessment of radiata pine: Sampling strategy revisited
