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Chromatogram of organic acids obtained at 210 nm: (A) standard mixture; (B) Malus toringo; (C) M. sieversii; (D) M. sylvestris. The retention times of tartaric acid, quininic acid, malic acid, lactic acid, citric acid, and succinic acid were 4.371 min, 4.598 min, 5.643 min, 6.766 min, 10.044 min, and 12.034 min, respectively.
