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Comparative Studies on the Properties and Infrared Spectra of Chitosans from Different Sources

Zhao guojun 1 Jiang yongming 1 Sun longsheng 2 Sui dexin 1 Shi yongchang 1 (1. Lab of Enzyme Engineering, 2. Animal Science Department, Agricultural College, Yangzhou University, Yangzhou, Jiangsu 225009)  
Five different chitosans were obtained from crayfish shell, shrimp shell, crab shell, prown shell and silkworm pupa under the same condition, and their yields were 13.6%, 8.7%, 12.3%, 10.5% and 1.8% respectively. Their properties were investigated. The results revealed that there were little difference in ash content(0.25~0.45%) and the degree of deacetylation(76~80%), while there was considerable difference in molecular weight. The molecular weights of chitosans from crayfish shell, shrimp shell, crab shell, prown shell and silkworm pupa, which were determined by viscosimetric method, were 1.28×10 6, 1.15×10 6, 1.06×10 6, 0.96×10 6 and 0.91×10 6 respectively. The five different chitosans were analyzed by infrared spectrometry and found a little difference in their spectra. It is suggested that their basic structures be similar, yet there were a slight differences in conformation and crystallinity.
【Fund】: 江苏省科委“九五”重点攻关项目
【CateGory Index】: O636
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