Laccase: nf In grapes, laccase is a copper-containing enzyme that oxidizes polyphenols (phenolic compounds formerly called vegetable tannin) using oxygen. Gray rot in grapes produced by botrytis cinerea (one of the pathogenic fungi of the vine) secretes this oxidative enzyme. It causes an irreversible deterioration of the quality of the musts with the consequences, the browning of the color of the juice and the disappearance of the antioxidants of the grape (the ...
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