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Research Article

Effects of Berry Maturity and Wine Alcohol on Phenolic Content during Winemaking and Aging

Caroline P. Merrell, Richard C. Larsen, James F. Harbertson
Am J Enol Vitic. January 2018 69: 1-11; published ahead of print October 30, 2017 ; DOI: 10.5344/ajev.2017.17035
Caroline P. Merrell
1Washington State University, 2710 University Drive, Richland, WA 99354-7224
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Richard C. Larsen
1Washington State University, 2710 University Drive, Richland, WA 99354-7224
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James F. Harbertson
1Washington State University, 2710 University Drive, Richland, WA 99354-7224
2Associate Professor of Enology, Washington State University, Viticulture and Enology Program, School of Food Science
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  • For correspondence: jfharbertson@wsu.edu
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Abstract

In this study, grape cultivar, fruit maturity, and alcohol were varied to determine their impacts on polymeric pigment formation in artificially aged wines. Polymeric pigments are formed primarily, but not exclusively, through the reaction of anthocyanins and tannins during wine aging. Two cultivars (Syrah and Cabernet Sauvignon) that differ in their native anthocyanin and tannin content were harvested at three maturities (20, 24, and 28 Brix) in order to vary the initial anthocyanin and tannin content and their ratio (A:T). At each harvest, juice sugar content was manipulated in the winery to simulate the two other respective maturities. The range of initial wine A:T varied by cultivar (Cabernet Sauvignon, 0.36 to 0.93; and Syrah, 1.3 to 2.1). Results of two-way ANOVAs indicated that fruit maturity and wine age significantly affect anthocyanin content and decline, as well as small polymeric pigment formation. The anthocyanin decline could be modeled by an exponential decay regression, with R2 values ranging from 0.996 to 0.999, depending on maturity and cultivar. Winery alcohol treatment and time significantly impacted the formation of large polymeric pigments. The initial wine anthocyanin content had the strongest correlation to total polymeric pigment content in wines (R2 of 0.735 and 0.670 for Syrah and Cabernet Sauvignon, respectively), while the relationship between A:T and total polymeric pigments was relatively poor (R2 of 0.042 and 0.405 for Syrah and Cabernet Sauvignon, respectively). Measuring wine phenolic hydrophobicity is also proposed to evaluate overall phenolic characteristics, and it was significantly impacted by cultivar, fruit maturity, and aging time.

  • alcohol
  • anthocyanin
  • berry maturity
  • phenolics ripening
  • polymeric pigment
  • tannin
  • Received April 2017.
  • Revision received August 2017.
  • Revision received October 2017.
  • Accepted October 2017.
  • ©2018 by the American Society for Enology and Viticulture
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Effects of Berry Maturity and Wine Alcohol on Phenolic Content during Winemaking and Aging
Caroline P. Merrell, Richard C. Larsen, James F. Harbertson
Am J Enol Vitic.  January 2018  69: 1-11;  published ahead of print October 30, 2017 ; DOI: 10.5344/ajev.2017.17035

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Effects of Berry Maturity and Wine Alcohol on Phenolic Content during Winemaking and Aging
Caroline P. Merrell, Richard C. Larsen, James F. Harbertson
Am J Enol Vitic.  January 2018  69: 1-11;  published ahead of print October 30, 2017 ; DOI: 10.5344/ajev.2017.17035
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