Probable Identity of the Pectinase Inhibitor in Grape Leaves

Authors


  • a

    Eastern Utilization Research and Development Division, Agricultural Research Service, U. S. Department of Agriculture.

  • b

    One of the laboratories of the Southern Utilization Research and Development Division, Agricultural Research Service, U. S. Department of Agriculture, New Orleans 19, Louisiana. Published with the approval of the Director of Research, North Carolina Agricultural Experiment Station, as Paper No. 1309 in the Journal Series.

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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