Abstract
Grape canes (Vitis vinifera L.) are a viticulture industry by-product with an important content of secondary metabolites, mainly polyphenols with a broad spectrum of demonstrated health benefits. Grape canes, therefore, have considerable economic potential as a source of high-value phytochemicals. In this work, liquid chromatography coupled with electrospray ionization hybrid linear trap quadrupole-Orbitrap mass spectrometry (LC–LTQ-Orbitrap) was used for the comprehensive identification of polyphenolic compounds in grape canes. Identification of polyphenols was performed by comparing their retention times, accurate mass measured, and mass fragmentation patterns with those of reference substances or available data in the literature. A total of 75 compounds were identified, including phenolic acids, flavanols, flavonols, flavanonols, flavanones, and stilbenoids. The most abundant polyphenols were proanthocyanidins and stilbenoids and their oligomers. Moreover, the high-resolution mass spectrometry analysis revealed the occurrence of 17 polyphenols never described before in grape canes, thereby providing a more complete polyphenolic profile of this potentially valuable by-product.
Highlights
The bark of woody plants considered a by-product of the forestry agricultural, and wood industry
The aim of the present work was to provide an accurate and comprehensive identification of polyphenols in grape canes using liquid chromatography coupled with electrospray ionization hybrid linear trap quadrupole-Orbitrap mass spectrometry (LC–LTQ-Orbitrap) analysis, with special focus on previously unreported compounds
The novelty of this study is to extend the knowledge about polyphenols identity of grape canes for the development of additives in food, cosmetics, biomaterials, and other biobased products
Summary
The bark of woody plants considered a by-product of the forestry agricultural, and wood industry. This can be an abundant source of polyphenolics compounds with high recovery yields [1,2,3]. Bark polyphenols might be esterified and used for the design of thermoplastic blends [4,5] and the developing of adhesive resins [6]. Grape canes, known as vine-shoots, are one of the most important by-products in viticulture, alongside grape seeds, pomace, stalks, and skins, all of which could provide low-cost raw material for the production of high-value phytochemicals because of their rich polyphenolic content.
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