31. Polyphenol, antioxidant and antimicrobial potential of six different white and red wine grape processing leftovers : /Kajetan Trošt, Anja Klančnik, Branka Mozetič Vodopivec, Melita Sternad Lemut, Katja Jug, Peter Raspor, Sonja Smole Možina, 2016, original scientific article Abstract: BACKGROUND
During winemaking, grape polyphenols are only partly extracted, and consequently unexploited. The main aim was to characterise the phenolic content of freeze-dried grape skin and seed (FDSS) extracts obtained from Slovenian and international grape varieties and 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. Keywords: grape skins and seeds, extraction solvents, phenolic profile, antioxidant activity, antimicrobial activity, anti-adhesion activity to stainless steel Published in RUNG: 08.08.2016; Views: 5139; Downloads: 0 This document has many files! More... |
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34. Targeted metabolomics employed for the studying of 'Pinot Noir' grape skin phenolics as induced by canopy microclimate manipulationMelita Sternad Lemut, Paolo Sivilotti, Pietro Franceschi, Ron Wehrens, Urška Vrhovšek, 2013, published scientific conference contribution abstract Keywords: tarčna metabolomika, Modri pinot, razlistanje, polifenoli, vinska trta Published in RUNG: 05.08.2014; Views: 6227; Downloads: 52 Link to full text |
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36. Canopy microclimate manipulation in the sustainable management of 'Pinot Noir' vineyard from Vipava valley : dissertationMelita Sternad Lemut, 2014, doctoral dissertation Keywords: Modri pinot, manipulacija mikroklime, grm vinske trte, odstranjevanje listov, profiliranje metabolitov, metabolomika, sekundarni metaboliti, polifenoli, izoprenoidi, mikrobna ekologija, fungicidi, trajnostno vinogradništvo, Vipavska dolina, disertacije Published in RUNG: 25.04.2014; Views: 6542; Downloads: 125 Link to full text This document has many files! More... |
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