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Effect of the percentage of ethanol in the extraction solvent on the extraction yield of 3-O-CQA and 3,5-O-di-CQA at (T = 30 °C; S/L = 1/50; t = 24 h). Bars with different small letters indicate significant differences in the yield of 3-O-CQA (p > 0.05) according to the Tukey test at 95%. Bars with different capital letters indicate significant differences in the yield of 3,5-O-di-CQA.
