Polyphenolic Content and Antioxidant Capacity in Fruits of Plum (Prunus domestica?L.) Cultivars “Valjevka” and “Mildora” as Influenced by Air Drying

摘要

Polyphenolic content and antioxidant capacity of freshly harvested plums cvs.n“Valjevka” and “Mildora,” and changes caused by drying were analyzed. Plumndrying at 90C resulted in significant changes in anthocyanins, flavonoids and phenolicsncontent, and antioxidant capacity in both cultivars examined. Statisticalnanalysis showed that antioxidant capacity of both fresh plums and prunes ofn“Valjevka” and “Mildora” is strongly influenced by the phenolic constituentsnof the fruit. The major phenolic compound in fresh plums and prunes is neochlorogenicnacid, followed by caffeic acid and chlorogenic acid. After drying, a significantndecrease in neochlorogenic acid and an increase in caffeic acid was observed,nwhile chlorogenic acid content decreased in prunes of “Valjevka,” and increasednin prunes of “Mildora.” Rutin and protocatechuic acid contents were slightlyndecreased after drying, while gallic acid content was dramatically increased.nA complete degradation of cyanidin was induced by drying.