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  • Title: Several properties of the partially purified proteinase inhibitor in eggplant exocarp.
    Author: Kanamori M, Ibuki F, Yamada M, Tashiro M, Miyoshi M.
    Journal: J Nutr Sci Vitaminol (Tokyo); 1975; 21(6):429-36. PubMed ID: 1225945.
    Abstract:
    A proteinase inhibitor was isolated and partially purified from the exocarp of eggplant, Solanum melongena L., by means of acetate buffer extraction, heat treatment, salting-out and column chromatography on DEAE-cellulose. This preparation showed inhibitory activities on various proteinases; trypsin [EC 3.4.4.4] and Pronase were strongly inhibited while alpha-chymotrypsin [EC 3.4.4.5] and Nagarse were weakly inhibited. The inhibitor was a protein substance, and, therefore, it was gradually inactivated by the long-time incubation with Pronase. The inhibition mode was non-competitive on trypsin and competitive on Pronase on the basis of Lineweaver-Burk plots. The investigations on the inhibition behavior in the co-existence of two kinds of proteinases suggested that the inhibitor was not of multi-headed type.
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