| Summary: | 碩士 === 靜宜大學 === 應用化學系 === 88 === In this study, α-chitin and α-chitosan are used as raw materials. To improve the water-solubility of chitosan and chitin the carboxymethyl groups were added to NH2 and C6 of glucosamine units by carboxymethylation.
The viscosities of Carboxymethyl chitin (CM-chitin) and caboxymethyl chitosan (CM-chitosan) solutions decreased with increasing temperature. Viscosities of solutions also indicate that the decrease with increasing temperature is more pronounced at high concentration (1%). The viscosities of CM-chitosan solutions decreased with addition of NaCl. With addition of NaCl, viscosities of CM-chitosan solution also decrease with increasing concentrations of CM-chitosan solutions. CM-chitin and CM-chitosan can be hydrolyzed by crude pepsin and the viscosities of solutions were decreased. Skin moisturizing tests show that the lower concentrations of CM-chitin, CM-chitosan, hyaluronic acid, lactic acid/ sodium lactate, lactic acid, and xylo-oligosaccharides the better the moisture results.
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