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Polyphenol, antioxidant and antimicrobial potential of six different white and red wine grape processing leftovers
Author(s) -
Trošt Kajetan,
Klančnik Anja,
Mozetič Vodopivec Branka,
Sternad Lemut Melita,
Jug Novšak Katja,
Raspor Peter,
Smole Možina Sonja
Publication year - 2016
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.7981
Subject(s) - flavonols , winemaking , polyphenol , chemistry , antimicrobial , food science , wine , antioxidant , pomace , cultivar , white wine , proanthocyanidin , botany , biology , biochemistry , organic chemistry
BACKGROUND During winemaking, grape polyphenols are only partly extracted, and consequently unexploited. The main aim was to characterize the phenolic content of freeze‐dried grape skin and seed ( FDSS ) extracts obtained from Slovenian and international grape varieties and to evaluate their antioxidant, antimicrobial and anti‐adhesive activities. RESULTS FDSS of six Vitis vinifera L. grapevine cultivars from Vipava Valley region (Slovenia) underwent extraction and sonification under different conditions. Flavonols were the predominant content of extracts from white ‘Zelen’ and ‘Sauvignon Blanc’ grape varieties, with strong antimicrobial activities against Gram‐negative bacteria. ‘Pinot Noir’ FDSS extracted with 50% aqueous ethanol extraction produced a high phenolic content in the final extract, which was further associated with strong antioxidant and antimicrobial activities against all tested bacteria. Bacterial adhesion to stainless steel surfaces with minimal and maximal surface roughness was significantly inhibited (up to 60%) across a wide FDSS concentration range, with lower concentrations also effective with two types of stainless steel surfaces. CONCLUSION FDSS extracts from winery by‐products show interesting phenolic profiles that include flavonols, catechins, anthocyanins and hydroxycinnamic acids, with yields influenced by grapevine cultivar and extraction conditions. The antioxidant, antimicrobial and anti‐adhesive activities of 50% aqueous ethanol ‘Pinot Noir’ FDSS extract reveals potential applications in food, pharmaceutical and cosmetic industries for these bioactive residues. © 2016 Society of Chemical Industry