title: UHPLC-PDA-ESI/HRMSn profiling method to identify and quantify oligomeric proanthocyanidins in plant products.
abstract: Oligomeric proanthocyanidins were successfully identified by UHPLC-PDA-HRMS(n) in a selection of plant-derived materials (jujube fruit, Fuji apple, fruit pericarps of litchi and mangosteen, dark chocolate, and grape seed and cranberry extracts). The identities of 247 proanthocyanidins were theoretically predicted by computing high-accuracy masses based on the degree of polymerization, flavan-3-ol components, and the number of A type linkages and galloyls. MS(n) fragments allowed characterization on flavan-3-ol based on the monomer, connectivity, and location of A-type bonds. Identification of doubly or triply charged ions of 50 PAs was made on the basis of theoretical calculations. A single catechin standard and molar relative response factors (MRRFs) were used to quantify the well-separated PAs. The ratios of the SIM peak counts were used to quantify each of the unseparated isomers. This is the first report of direct determination of each of the proanthocyanidins in plant-derived foods and proanthocyanidins containing an epifisetinidol unit in grape seeds.
authors.affiliation: Food Composition and Methods Development Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, U.S. Department of Agriculture , Building-161, BARC-East, 10300 Baltimore Avenue, Beltsville, Maryland 20705, United States.
authors.forename: Long-Ze
authors.initials: LZ
authors.lastname: Lin
authors.forename: Jianghao
authors.initials: J
authors.lastname: Sun
authors.forename: Pei
authors.initials: P
authors.lastname: Chen
authors.forename: Maria J
authors.initials: MJ
authors.lastname: Monagas
authors.forename: James M
authors.initials: JM
authors.lastname: Harnly
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005638:Fruit / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry*; D010944:Plants / Q000737:chemistry; D044945:Proanthocyanidins / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D010936:Plant Extracts; D044945:Proanthocyanidins
keywords: UHPLC-PDA-ESI/HRMSn profiling method; identification; oligomeric proanthocyanidins; plant products; quantification