title: Characterization of polyphenolics in the seed coat of Black Jamapa bean (Phaseolus vulgaris L.).
abstract: The common bean contains phytochemicals, including phenolic compounds, which can provide health benefits to the consumer. Our objective was to characterize the polyphenolic compounds present in the seed coat of Black Jamapa bean and to test fractionation methods that permit the recovery of polyphenolics in their naturally occurring forms. A 100% methanol extract from seed coats was subjected to different chromatographic fractionation methods. Analysis by HPLC-MS revealed that a better separation of phytochemicals was achieved using direct silica gel fractionation, which allowed more accurate identification of compounds, especially of the flavonols. Anthocyanins, flavanol monomers, and heterogeneous flavanol oligomers up to hexamers were detected. To our knowledge, this is the first time that myricetin glycoside and proanthocyanidin oligomers containing (epi)-gallocatechin have been reported in the black bean. The fractionation methods used in this study produced large quantities of natural mixtures of flavonoids suitable for testing bioactivity and phytochemical interactions.
authors.affiliation: Programa de Posgrado en Alimentos del Centro de la Republica (PROPAC), Research and Graduate Studies in Food Science, School of Chemistry, Universidad Autonoma de Queretaro, Queretaro, 76010, Mexico.
authors.forename: Xochitl
authors.initials: X
authors.lastname: Aparicio-Fernandez
authors.forename: Gad G
authors.initials: GG
authors.lastname: Yousef
authors.forename: Guadalupe
authors.initials: G
authors.lastname: Loarca-Pina
authors.forename: Elvira
authors.initials: E
authors.lastname: de Mejia
authors.forename: Mary Ann
authors.initials: MA
authors.lastname: Lila
mesh_terms: D000872:Anthocyanins / Q000032:analysis; D005591:Chemical Fractionation; D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000032:analysis* / Q000302:isolation & purification; D013058:Mass Spectrometry; D000432:Methanol; D027805:Phaseolus / Q000737:chemistry*; D010636:Phenols / Q000032:analysis* / Q000302:isolation & purification; D010936:Plant Extracts / Q000737:chemistry; D059808:Polyphenols; D044945:Proanthocyanidins / Q000032:analysis; D012639:Seeds / Q000737:chemistry*
chemical_list: D000872:Anthocyanins; D005419:Flavonoids; D010636:Phenols; D010936:Plant Extracts; D059808:Polyphenols; D044945:Proanthocyanidins; D000432:Methanol