SUMMARY Studies were continued on the chemical nature of the water‐soluble substance in Muscadine grape leaves that was previously reported as inhibiting pectinase and cellulase. The inhibitor is a tannin or tannin‐like material, removable from leaf extracts by hide powder, caffeine, gelatin, and nicotine sulfate. Muscadine leaves had the highest inhibiting activity of the plants tested.
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Porter et al. (1961) studied this question.
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