Abstract

A structure that is resistant to (1 → 3)β- d-glucanase is formed when an aqueous suspension of curdlan ( DP n = 455 ) is heated to high temperatures. The resistance increases with increasing temperature and time of heat treatment. On similar treatment, (1 → 3)β- d-glucan ( DP n = 131 ) also becomes resistant to (1 → 3)β- d-glucanase. Electron microscopic examination showed it is a pseudocrystalline form with an electrondense structure that is resistant to (1 → 3)β- d-glucanase, but that fine fibrils are disrupted by the enzyme. The resistant structure may be formed by a hydrophobic reaction.

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