English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A study has been made O'f the enzymic degradation of chitin and the sodium salt of chitin sulphuric acid by a chitinase prepared from the intestinal tract of the snail, Helix aspersa. It is shown that, in a citrate-phosphate buffer, the pH for optimum activity is 4.8 for both substrates. Chitin, prepared from both lobster cuticle and fly puparia, is broken down by snail chitinase to N-acetylo- glucosamine, although there is alsO' a trace O'f o-glucosamine. The sO'dium salt O'f chitin sulphuric acid alsO' breaks dO'wn to N-acetyl-D-glucO'samine and o-glucosamine. In both cases N-acetyl-D-glucO'samine was isolated. The chitinase is without action O'n chitin nitrate. Acid hydrolysis O'f both chitin nitrate and the sO'dium salt O'f chitin sulphuric acid leads to' the fO'rmation O'f o-glucosamine, which has been isolated as 2-hydrO'xynaphthylidene glucO'samine. All attempts to' phO'sphorylate chitin were unsuccessful. The structure O'f chitin is discussed.

Studies on Chitin I. Enzymic Degradation of Chitin and Chitin Esters