title: Influence of post-pruning storage on stilbenoid levels in Vitis vinifera L. canes.
abstract: Increasing evidence for the health benefits of E-resveratrol has triggered interest in stilbenoids in grapes, wine and by-products. Less attention has been paid to stilbenoid levels in viticulture residues. However, grape canes are a promising source of stilbenoids and have economic potential because they are a source of high-value phytochemicals. The objective of this research was to determine the effect of post-pruning storage on stilbenoid levels in grape canes. In most samples, the predominant stilbenoid was (E)-resveratrol, followed by (E)-ε-viniferin. In Pinot Noir canes stored after pruning at room temperature, the stilbenoid levels increased significantly after 8 months. The concentration was increased by up to fivefold, reaching 4,777 mg kg(-1)dw (dry weight). This effect did not occur in frozen, lyophilised or milled material. Branches collected directly from the plants after grape vintage and those remaining on the plant after pruning showed only a small increase in stilbenoid levels.
authors.affiliation: Depto. Análisis Instrumental, Facultad de Farmacia, Universidad de Concepción, Chile.
authors.forename: Tamara
authors.initials: T
authors.lastname: Gorena
authors.affiliation: Depto. Análisis Instrumental, Facultad de Farmacia, Universidad de Concepción, Chile.
authors.forename: Vania
authors.initials: V
authors.lastname: Saez
authors.affiliation: Depto. Análisis Instrumental, Facultad de Farmacia, Universidad de Concepción, Chile.
authors.forename: Claudia
authors.initials: C
authors.lastname: Mardones
authors.affiliation: Depto. Análisis Instrumental, Facultad de Farmacia, Universidad de Concepción, Chile.
authors.forename: Carola
authors.initials: C
authors.lastname: Vergara
authors.affiliation: Institute of Food Chemistry, Technische Universität Braunschweig, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Winterhalter
authors.affiliation: Depto. Análisis Instrumental, Facultad de Farmacia, Universidad de Concepción, Chile. Electronic address: dvonbaer@udec.cl.
authors.forename: Dietrich
authors.initials: D
authors.lastname: von Baer
mesh_terms: D005638:Fruit / Q000737:chemistry / Q000254:growth & development; D010636:Phenols / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry*; D018547:Plant Stems / Q000737:chemistry* / Q000254:growth & development; D027843:Vitis / Q000737:chemistry* / Q000145:classification / Q000254:growth & development
chemical_list: D010636:Phenols; D010936:Plant Extracts
keywords: (E)-Resveratrol; (E)-ε-Viniferin grape cane; Post-pruning storage; Stilbenoids; Vitis vinifera