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Research Article

Addition Rate of Exogenous Tannin for Optimal Tannin Retention in Hybrid Red Wines

Alex J. Fredrickson, David C. Manns, Anna Katharine Mansfield
Am J Enol Vitic. January 2020 71: 62-69; published ahead of print October 30, 2019 ; DOI: 10.5344/ajev.2019.19022
Alex J. Fredrickson
1Cornell Enology Extension Laboratory, Cornell AgriTech Geneva, NY 14456
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David C. Manns
1Cornell Enology Extension Laboratory, Cornell AgriTech Geneva, NY 14456
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Anna Katharine Mansfield
1Cornell Enology Extension Laboratory, Cornell AgriTech Geneva, NY 14456
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  • For correspondence: akm87@cornell.edu
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Abstract

Winemakers often add exogenous products to increase the tannin content in red hybrid wines, but the recommended dosage of 50 to 400 mg/L may not increase the final concentration of condensed tannins effectively. In 2013, wines were made from Maréchal Foch, Corot noir, and Cabernet franc to compare retention of exogenous tannins in interspecific hybrids and Vitis vinifera. After analyzing 12 commercial tannin products for condensed tannin concentration via high-performance liquid chromatography solid phase extraction-phloroglucinolysis, the product with the highest concentration (38%) was added at 400, 800, and 1200 mg/L after crush but prior to yeast inoculation. One lot of each cultivar was also pressed off the skins immediately, fermented in the presence of 1600 mg/L exogenous tannin, then back-blended postfermentation with a control wine for a final theoretical concentration of 400 mg/L condensed tannin. At bottling, tannin concentrations in all treatments were greater than their respective controls. Tannin retention rates varied by cultivar, ranging from 19 to 24% in Maréchal Foch wines, 25 to 43% in Corot noir, and 34 to 48% in Cabernet franc. The back-blended wines had similar tannin retention rates to those with 400 mg/L additions in Corot noir and Cabernet franc, but greater tannin retention in Maréchal Foch (75 mg/L with a 400 mg/L addition and 93 mg/L in the back-blended wines). Though concentrations of condensed tannins were greater in all treated wines, none exceeded 50% retention. This suggests that high concentration additions of exogenous tannin increase the condensed tannins in hybrid red wines, but retention rates vary by cultivar.

  • Cabernet franc
  • Corot noir
  • exogenous tannin
  • Maréchal Foch
  • tannin retention
  • Received March 2019.
  • Revision received September 2019.
  • Accepted October 2019.
  • ©2020 by the American Society for Enology and Viticulture
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Addition Rate of Exogenous Tannin for Optimal Tannin Retention in Hybrid Red Wines
Alex J. Fredrickson, David C. Manns, Anna Katharine Mansfield
Am J Enol Vitic.  January 2020  71: 62-69;  published ahead of print October 30, 2019 ; DOI: 10.5344/ajev.2019.19022

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Addition Rate of Exogenous Tannin for Optimal Tannin Retention in Hybrid Red Wines
Alex J. Fredrickson, David C. Manns, Anna Katharine Mansfield
Am J Enol Vitic.  January 2020  71: 62-69;  published ahead of print October 30, 2019 ; DOI: 10.5344/ajev.2019.19022
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