Abstract − Analytical Sciences, 20(2), 395 (2004).
Microwave-Assisted Extraction of Quercetin and Acid Degradation of Its Glycosides in Psidium Guajava Leaves
Jianlin HUANG and Zhanxia ZHANG
School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou 510275, China
Microwave-assisted extraction (MAE) and microwave-assisted hydrolysis (MAAH) were developed for the sample preparation of guava leaves prior to GC determination of quercetin and its glycosides. Ethanol was selected as the solvent. The optimum MAE temperature, particle size, solvent volume and MAE time are 120°C, 40 - 60 mesh, 20 mL and 5 min, respectively; the optimum MAAH temperature and time, HCl concentration, solvent are 100°C, 5 min, 1.2 mol L-1 HCl and ethanol, respectively.
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