title: Microwave-assisted extraction of quercetin and acid degradation of its glycosides in Psidium guajava leaves.
abstract: 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 degrees C, 40 - 60 mesh, 20 mL and 5 min, respectively; the optimum MAAH temperature and time, HCl concentration, solvent are 100 degrees C, 5 min, 1.2 mol L(-1) HCl and ethanol, respectively.
authors.affiliation: School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou 510275, China.
authors.forename: Jianlin
authors.initials: J
authors.lastname: Huang
authors.forename: Zhanxia
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000143:Acids; D006027:Glycosides / Q000737:chemistry*; D006868:Hydrolysis; D010316:Particle Size; D018515:Plant Leaves / Q000737:chemistry*; D031647:Psidium / Q000737:chemistry*; D011794:Quercetin / Q000737:chemistry / Q000302:isolation & purification*; D012997:Solvents; D013696:Temperature
chemical_list: D000143:Acids; D006027:Glycosides; D012997:Solvents; D011794:Quercetin