Influence of ultrasonication assisted extraction on the content of bioactive compounds and antioxidant activity in grape marc extracts

Abstract

Ultrasonication is an efficient technique for extracting intracellular bioactive compounds from the plant matrix. The red grape marc from the "Isabella" variety was used for the research. The influence of the duration of ultrasonication assisted extraction (UAE) of 10 and 60 min and of the extraction temperature 30 and 65°C on the total polyphenol content (TPC), total anthocyanins content (TAC) and antioxidant activity (AA), determined by the DPPH test, in the ethanolic extracts of 60% (v/v) of grape marc. The obtained results attest that the temperature has a pronounced influence on the UAE efficiency on the TPC and TAC in grape marc extracts.