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The effect of basic conditions on the retention rates of 3-CQA and A7G. Results using: (a) pH values of ammonium hydrogen carbonate, (b) various concentrations of ammonium hydrogen carbonate ranging from 0 to 400 mmol/L, and (c) time from 0 to 2.5 h. Means indicated by different letters differed significantly with a value of p < 0.01.
