Phenolic composition of apple juice treated by laccase immobilized on copper-chelate regenerable carrier

Phenolic composition of apple juice treated with laccase immobilized on copper-chelate carrier was determined by HPLC analysis. Significant reductions were obtained for all the phenolic compounds identified with respect to the untreated juice. The greatest extent of reduction was for chlorogenic acid and (-)-epicatechin (47.1 and 36.4%, respectively).