title: Identification of two novel Prodelphinidin A-type dimers from roasted hazelnut skins ( Corylus avellana L.).
abstract: Two new A-type dimeric prodelphinidins, EGC-(2β→O7, 4β→8)-C and EGC-(2β→O5, 4β→6)-C, were isolated from the skins of roasted hazelnut ( Corylus avellana L.) by low-speed rotary countercurrent chromatography (LSRCCC) and final purification by preparative HPLC. Their structures were determined by a combination of mass spectrometry (HPLC-ESI-MS(n) and HR-ESI-MS) and NMR spectroscopy that included the application of 2D methods ((1)H-(1)H COSY, HSQC, HMBC, and NOESY). Furthermore, circular dichroism (CD) and acid-catalyzed degradation (phloroglucinolysis) confirmed the proposed structures.
authors: Institute of Food Chemistry, Technische Universität Braunschweig , Schleinitzstrasse 20, 38106 Braunschweig, Germany.
authors: Tuba
authors: T
authors: Esatbeyoglu
authors: Victor
authors: V
authors: Wray
authors: Peter
authors: P
authors: Winterhalter
mesh_terms: D000872:Anthocyanins / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D031211:Corylus / Q000737:chemistry*; D003377:Countercurrent Distribution; D019281:Dimerization; D013058:Mass Spectrometry; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry*
chemical_list: D000872:Anthocyanins; D010936:Plant Extracts; C472180:prodelphinidin B-2 3'-O-gallate