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Effects of different treatments on the quality of winter jujube. (A) Weight loss, (B) total soluble solids, (C) polyphenolic content, (D) ascorbic acid, and (I) PAL activity of winter jujube. Bars show mean ± standard deviation values, and different lowercase letters indicate significant differences (P < 0.05). PAL, phenylalanine ammonia-lyase; PPO, polyphenol oxidase; US, ultrasonication.
