title: Determination of the predominant catechins in Acacia catechu by liquid chromatography/electrospray ionization-mass spectrometry.
abstract: A high-performance liquid chromatography coupled with electrospray ionization mass spectrometry (LC/ESI-MS) method under selected ion monitoring mode (SIM) was developed to quantitate the predominant catechins, catechin, epicatechin, epicatechin-3-O-gallate, and epigallocatechin-3-O-gallate, in the medicinal plant catechu (Acacia catechu). Other major secondary products including caffeine, flavanol dimers, and flavonol glycosides were also identified by their molecular ion peaks and fragmentation peaks using LC/MS and LC/MS/MS. For the investigated ion concentration ranges of catechin, epicatechin, epicatechin-3-O-gallate, and epigallocatechin-3-O-gallate, good linearities (r2 > 0.99) were obtained for each calibration curve. Validation for this method showed an accuracy ranging from 1.06 to 11.76%, and the precision (relative standard deviation) varied between 1.60 and 9.36% for these four analytes. This is the first quantitative determination of all predominant catechins in catechu heartwood and leaves.
authors.affiliation: Department of Medicinal Chemistry, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey 08854, USA.
authors.forename: Diandian
authors.initials: D
authors.lastname: Shen
authors.forename: Qingli
authors.initials: Q
authors.lastname: Wu
authors.forename: Mingfu
authors.initials: M
authors.lastname: Wang
authors.forename: Yonghong
authors.initials: Y
authors.lastname: Yang
authors.forename: Edmond J
authors.initials: EJ
authors.lastname: Lavoie
authors.forename: James E
authors.initials: JE
authors.lastname: Simon
mesh_terms: D000045:Acacia / Q000737:chemistry*; D028241:Camellia sinensis / Q000737:chemistry; D002392:Catechin / Q000031:analogs & derivatives / Q000032:analysis*; D002853:Chromatography, Liquid; D018515:Plant Leaves / Q000737:chemistry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D002392:Catechin; C062669:epicatechin gallate; C045651:epigallocatechin gallate