Bioactive Condensed Tannins from Bark:Chemical Properties, Enzyme Inhibition and Anti-Plant-Viral Activities
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概要
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Nondialyzable, highly condensed, procyanidin type tannins having enzyme-inhibitory and anti-plant-viral activities were isolated from constituents in the barks of several trees as partially purified brownish powders. These compounds differed primarily in average molecular weight (PI: 20, 000, CDL: 10, 000, PYM: 8000 and TDS: 5000; determined by ultracentrifuge) and showed more than 1000 times stronger enzyme-inhibitory activity [plasmin (ED50: 0.05-0.4μM), thrombin (0.02-0.2μM), papain (0.08-0.6μM), trypsin (0.25-2.0μM] than (-)-epicatechin on a molar-ratio basis. The mode of inhibition of CDL was determined to be a noncompetitive-uncompetitive on both plasmin and papain. In preliminary anti-plant-viral bioassay, CDL showed a protective effect (93%; glove amarath) against the infection with PVX and a therapeutic effect (80%; pot test) against PVX, TMV and CGMMV at 1000ppm.
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