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Chemical Papers

, Volume 73, Issue 1, pp 195–203 | Cite as

Stability of polyphenolic extracts from red grape skins after thermal treatments

  • Ivana Tomaz
  • Iva Šikuten
  • Darko PreinerEmail author
  • Željko Andabaka
  • Nera Huzanić
  • Matija Lesković
  • Jasminka Karoglan Kontić
  • Danijela Ašperger
Original Paper
  • 46 Downloads

Abstract

Considering the potential of applying grape skin extract (GSE) as functional ingredients in products that must be thermally processed, the aim of this study was to evaluate the stability of individual polyphenols in grape skin extracts submitted to heating at different temperatures. Polyphenolic compounds were extracted by applying 20% aqueous ethanol containing 1% acetic acid for 1 h at 50 °C on a magnetic stirrer. The obtained extract was divided into aliquots and submitted to heating at different temperatures for a various time. The content of individual phenolic compounds in all incubated extract was determined by the HPLC method. All studied compounds were very stable during heating at 40 °C. Among analyzed anthocyanins, diglucosides were more stable than corresponding monoglucosides. Gallocatechin and procyanidins B1 and B2 contents were decreased, while catechin and epicatechin contents were increased during thermal treatments. At both incubation temperature contents of caftaric and coutaric acid were decreased, while in the same time contents of caffeic and coumaric acids were raised which could be due to hydrolysis. A significant increase of gallic, protocatechuic, vanillic, and syringic acid contents was due to thermal degradation of delphinidin-3-O-glucoside, cyanidin-3-O-glucoside, peonidin-3-O-glucoside, and malvidin-3-O-glucoside, respectively. trans-Piceid showed high stability toward thermal treatments.

Keywords

Grape skin Polyphenols Thermal treatments Stability HPLC assay 

Notes

Acknowledgments

This research has been funded/supported by the project KK.01.1.1.01.0005 Biodiversity and Molecular Plant Breeding, Centre of Excellence for Biodiversity and Molecular Plant Breeding (CoE CroP-BioDiv), Zagreb, Croatia.

Supplementary material

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2018

Authors and Affiliations

  1. 1.Department of Viticulture and Enology, Faculty of AgricultureUniversity of ZagrebZagrebCroatia
  2. 2.Faculty of AgricultureCentre of Excellence for Biodiversity and Molecular Plant BreedingZagrebCroatia
  3. 3.Department of Analytical Chemistry, Faculty of Chemical Engineering and TechnologyUniversity of ZagrebZagrebCroatia

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