The constituents and contents of esterifing derivatives of organic and aqueous phases in extracts from Chaenomeles speciosa (Sweet) Nakai fruits were analysed by GC-MS. The results indicated that there were 15 and 17 compounds in organic and aqueous phases, respectively. Besides there were common fatty acids, there were a lof of binary acids and ternary acids. The contents of malic acid and citric acid in aqueous and organic phases reached to 64.007%, 70.492% and 30.305%, 22.121% respectively. Therefore, malic acid and citric acid are the major constituents of organic acids in C. speciosa fruits.
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