Chitosan [(l->4)-linked 2-amino-2-deoxy-/?-D-glucan] and chitin (N-acetylchitosan) are present in the cell walls of phytopathogens. Chitinase (EC 3.2.1.14) activity has 3065 been found in almost all plant tissues,1* and the enzyme actually degrades fungal cell walls2} to inhibit fungal
Chitosan" [1•¨4)-2-amino-2-deoxy-ƒÀ-Dglucan] is found in some microorganisms" and is readily prepared from naturally abun dant chitin by N-deacetylation with alkalis' Chitosan and its acyl derivatives are of interest,
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