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In a conical flask, 1.0 g of citric acid monohydrate and 0.9 g of β-alanine were dissolved in 10 mL of distilled water, with the pH adjusted to 3.0 using hydrochloric acid (HCl). The solution was ...

A 1 g sample of A. fructus seed/peel powder was added to a conical flask with 25 mL anhydrous ethanol and extracted with ultrasonic waves at 40 kHz for 30 min. After cooling to room temperature, the ...