| Abstract
| - Commercial pectolytic enzymes were investigated for their influence on phenolics and antioxidantactivities of asparagus juice. The antioxidant activity of asparagus juice was analyzed according to2,2‘-diphenyl-l-picrylhydrazyl and 2,2‘-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) methods. Theenzymes, with the exception of pectinase from Rhizopus sp., contained rutinase, which hydrolyzedrutin to quercetin. Asparagus juice treated with Viscozyme had the highest quercetin content withoutexhibiting a significant increase in the antioxidant activity. For a pectinase from Aspergillus niger, theantioxidant activity of asparagus juice was markedly reduced. Caution should be paid in the selectionof pectolytic enzyme preparations for production of antioxidant activity-rich juice. Keywords: Asparagus juice; pectolytic enzyme preparation; rutinase; antioxidant activity; rutin;quercetin
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