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  • Title: Alkali-induced conversion of beta-chitin to alpha-chitin.
    Author: Noishiki Y, Takami H, Nishiyama Y, Wada M, Okada S, Kuga S.
    Journal: Biomacromolecules; 2003; 4(4):896-9. PubMed ID: 12857070.
    Abstract:
    Crystal conversion of beta-chitin to alpha-chitin by aq. NaOH treatment was studied for a highly crystalline beta-chitin sample from diatom spine. The minimum NaOH concentration to cause swelling was between 25% and 30% w/w. The alkali-swollen material was poorly crystalline and was regenerated as alpha-chitin on washing with water. This conversion caused total collapse of the original microfibrillar morphology. These features are similar to those of 7 N-8 N HCl treatment reported earlier, but alkali treatment was free from depolymerization or deacetylation.
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