Abstract:

The contents of polyphenols, soluble sugars and organic acids in Fuji apples from different growing regions
were analyzed and compared using high performance liquid chromatography (HPLC). Total polyphenol contents in Fuji
apples ranged from 101.99 to 177.62 mg/100 g, with chlorogenic acid being the most abundant component followed by
epicatechin. Total sugar contents varied between 83.71 mg/g and 119.60 mg/g, with fructose being the most abundant,
accounting for 60.52% and positively correlating with the total sugar amount (r = 0.92). Fuji apples from all growing regions
had total organic acid contents in the range of 3.785–4.808 mg/g, and malic acid was the most abundant acid, accounting for
93.20% and extremely significantly positively correlating with the total organic acid amount (r = 0.98), followed by succinic
acid. Different growing regions followed the decreasing order: Ansai ＞ Jingning ＞ Yanyuan ＞ Sanmenxia ＞ Luochuan ＞
Tongchuan > Tianshui ＞ Yan’an ＞ Yantai ＞ Fengxiang ＞ Akesu ＞ Fufeng for total polyphenols, Yanyuan ＞ Yan’an ＞
Sanmenxia > Akesu ＞ Jingning ＞ Yantai ＞ Ansai ＞ Tongchuan ＞ Fufeng ＞ Luochuan ＞ Fengxiang > Tianshui for
total sugars, Luochuan ＞ Fengxiang ＞ Tongchuan ＞ Yantai > Jingning ＞ Akesu ＞ Sanmenxia ＞ Yanyuan ＞ Yan’an ＞
Ansai ＞ Tianshui ＞ Fufeng for total organic acids.

Key words: Fuji apples, growing regions, polyphenols, soluble sugars, organic acids