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144812 - Focus on the role of seed tannins and pectolytic enzymes in the color development of Pinot noir wine.pdf (2.19 MB)

Focus on the role of seed tannins and pectolytic enzymes in the color development of Pinot noir wine

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posted on 2023-05-20, 23:57 authored by Sparrow, AM, Warwick GillWarwick Gill, Robert Dambergs, Dugald CloseDugald Close
Maceration techniques which promote the extraction of color pigments and tannin from grapes are often sought in Pinot noir winemaking to optimise color stability; alternatively, exogenous grape tannins may be included during fermentation. To examine the effect of seed-derived tannins and the use of pectolytic enzymes on color development in wines, conventional must preparations of Vitis vinifera L. cv Pinot noir grapes were compared with wines made using a supplementary addition of either a commercial seed tannin product or previously fermented seeds, while in a complementary experiment, seeds were sequentially removed during fermentation. After 6 months bottle aging, wines supplemented with either a commercial seed tannin solution (0.4 g/L), or fermented seeds (20% w/w seeds) had from 60% to 95% higher tannin concentration than the untreated wine, and up to 60% more monomeric anthocyanins. Conversely, when a third of the seeds were removed from the fermenting wine, the concentration of both tannin and non-bleachable pigments was 20–30% lower than in untreated wines and the wine hue had more red-purple tones. Exploration of the use of pectolytic enzymes in conjunction with seed removal was also found to have a significant impact on wine color parameters. Further insights on the timing of egress of tannin precursors from seeds was obtained from histochemical examination of the seeds that had been removed during alcoholic fermentation.

Funding

Wine Australia

History

Publication title

Current Research in Food Science

Volume

4

Pagination

405-413

ISSN

2665-9271

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Elsevier Science Bv

Place of publication

Netherlands

Rights statement

© 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) license, (http://creativecommons.org/licenses/bync-nd/4.0/).

Repository Status

  • Open

Socio-economic Objectives

Wine grapes

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