Study on Antioxidant Activity and Medicinal Suitability of Dried Peach Processed from Unripe Peaches of Different Varieties
This study aims to provide a reference for comprehensively developing and utilizing unripe peaches by analyzing the content of chlorogenic acids and their antioxidant activities of dried peach processed from unripe peaches of different varieties.The unripe peaches of 33 varieties were used as experimental materials.Different dried peaches were prepared by drying at 60℃(HAD60),freeze-drying(FD),and sun drying(SD).The antioxidant activity and medicinal suitability of unripe peaches of different varieties were evaluated by measuring DPPH radical scavenging ability,total antioxidant capacity,and the contents of total phenol,neochlorogenic acid(5-CQA),chlorogenic acid(3-CQA),and cryptochlorogenic acid(4-CQA)of the dried peach samples.The test results showed that the three processing methods in descending order were FD>HAD60>SD in terms of the total phenol content,DPPH radical scavenging ability,and total antioxidant ability of the same variety.The variation ranges of total phenol content(gallic acid equivalent,GE),DPPH radical scavenging ability(Trolox equivalent,TE),and total antioxidant ability of dried peach samples treated with SD were 2.96-19.54 mg/g,2.11-9.13 mg/g,and 24.83-108.96 mmol/kg,respectively.The three processing methods in descending order were FD>HAD60>SD in terms of the contents of 5-CQA,3-CQA,and 4-CQA.The variation ranges of 5-CQA,3-QCA,and 4-QCA in dried peach samples treated with SD were 0.27-6.23,0.38-3.75,and 0.14-1.69 mg/g,respectively.The contents of 5-CQA,3-CQA,and 4-CQA were significantly positively correlated with antioxidant indexes(P<0.01),with the strongest correlation of 5-CQA.Among the unripe peaches of 33 varieties tested,25 were suitable for dried peach processing,including 17 wild peaches,six nectarines,and two ornamental peaches.The varieties with the best medicinal suitability are'Jinchun','Jinhua',and'Zhongtao 11',and some special nectarines('188','CN 20',and'Chunmi')and ornamental peaches('Hongyetao'and'Beijing S9')are suitable for dried peach processing due to the high content of chlorogenic acids in unripe peaches.
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