Determination of total phenols, anthocyanins and color parameters of Vranec wines

Piperevski, Violeta and Ivanova, Violeta (2023) Determination of total phenols, anthocyanins and color parameters of Vranec wines. In: 21st International Symposium and Summer School on Bioanalysis, 10-15 July 2023, Târgu Mureș, Romania.

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Abstract

Introduction and objectives: In this study, total phenols (TP), total anthocyanins (TA) and colour parameters of Vitis Vinifera red wines Vranec from vintage 2022, produced in the Republic of N. Macedonia, have been evaluated. The wines have been produced with three winemaking techniques, including classical fermentation, roto process and punch-down technique, in order to study and compare the effect of vinification on phenolic composition.
Materials and methods: Total phenols were determined using the Folin-Ciocalteu methot at 765nm and expressed as gallic acid equivalent (GAE, mg/l) (Ivanova et al., 2010). Determination of the total anthocyanins was realized by the method proposed by Di Stefano (1989). For calculation of colour intensity (CI) and hue (H), wine absorbance was measured at 420 nm, 520 nm and 620 nm.
Result and discussion: Vinification technique had an influence of the phenolic content of wines, observing highest content of TP and TA in Vranec wines produced with roto technique (TP: 1720 mg/L, TA: 254 mg/L) in comparison to Vranec wines produced with punch-down technique (TP: 1222 mg/L, TA: 242 mg/L) and classical fermentation (TP: 1198 mg/L, TA: 211 mg/L). In addition, the values for CI and H were the highest in Vranec wines produced with the roto process of fermentation.
Conclusion: Wines produced with roto process of fermentation presented highest content of total phenols, anthocyanins, colour intensity and hue, confirming that this fermentation technique is the most suitable for production of stable and complex wines rich in polyphenols.

Item Type:	Conference or Workshop Item (Lecture)
Subjects:	Natural sciences > Chemical sciences Agricultural Sciences > Other agricultural sciences
Divisions:	Faculty of Agriculture
Depositing User:	Violeta Ivanova Petropulos
Date Deposited:	04 Sep 2023 09:02
Last Modified:	04 Sep 2023 09:02
URI:	https://eprints.ugd.edu.mk/id/eprint/32127

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