关键词: 苹果, 果皮, 果肉, 类黄酮, 组成, 含量, 指纹图谱相似性

Abstract: Flavonoids in peel and pulp of‘Nagafu 2’apple were measured by RP-HPLC，and comparative studies on composition and content of flavonoids in‘Nagafu 2’apple from 6 producing areas were carried out. There were 16 flavonoids belonging to 4 groups in peel with total content 810.12–1 304.59 mg · kg-1，among which flavonols accounted for 58.3%–73.1%；There were 11 flavonoids belonging to 3 groups in pulp with total content 79.87–124.88 mg · kg-1，among which flavanols accounted for 67.5%–85.5%；All flavonoids，especially flavonols in pulp had very low content，which were only as much as 0.1%–3.1% of those in peel；Flavonoids in‘Nagafu 2’apple from one producing area were same as those in‘Nagafu 2’apple from another producing area，and the similarity of liquid chromatographic fingerprint of flavonols in peel of‘Nagafu 2’apple from different producing areas were up to 0.922–0.990；Content of flavonoids mostly indicated significant difference at P < 0.05 level between samples from different producing areas，sample from Baishui County of Shaanxi had the highest content in peel and the lowest content in pulp，sample from Changli County of Hebei and sample from Muping County of Shandong respectively had the lowest content in peel and the highest content in pulp；The average amount of flavonoids in single fruit were 35.14 mg，of which 41.3 % was in peel and 58.7% was in pulp.

Key words: apple, peel, pulp, flavonoids, composition, content, similarity of fingerprint