title: [Determination of quercetin in apples by reversed-phase high performance liquid chromatography].
abstract: A method for the determination of quercetin in pulp and peel of apples by reversed-phase high performance liquid chromatography with internal standard was developed. Samples were frozen at -80 degrees C for 24 h, then added 6 mol/L hydrochloride under the protection of antioxidant 2,6-di-tert-butyl-p-cresol. The slurry was hydrolyzed thermostatically at 90 degrees C for 2 h and centrifugated for 10 min. The separation was performed on an ODS column (150 mm x 6.0 mm i.d., 5 microm). Methanol-water (55:45, v/v) (pH adjusted to 3.3 with acetic acid) was used as the mobile phase with a flow rate of 1.0 mL/min. The injection volume was 20 microL. The detection wavelength was 370 nm. The results showed that the quercetin content in pulp and in peel were 3.11-10.78 microg/g and 253.57-744.59 microg/g, respectively. The mean recovery of quercetin in apple pulp was 100.4%. The method is simple, accurate, and reliable.
authors.affiliation: School of Public Health, Nanjing Medical University, Nanjing 210029, China. maoli@njmu.edu.cn
authors.forename: Li
authors.initials: L
authors.lastname: Mao
authors.forename: Nianzu
authors.initials: N
authors.lastname: Jin
authors.forename: Jingheng
authors.initials: J
authors.lastname: Chen
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D027845:Malus / Q000737:chemistry*; D011794:Quercetin / Q000032:analysis*
chemical_list: D011794:Quercetin