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Technical Brief

Evaluation of a Comprehensive Red Wine Phenolics Assay Using a Microplate Reader

Theresa M. Heredia, Douglas O. Adams, Kelly C. Fields, Paul G. Held, James F. Harbertson
Am J Enol Vitic.  2006  57: 497-502  ; DOI: 10.5344/ajev.2006.57.4.497
Theresa M. Heredia
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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  • For correspondence: theredia@jpvwines.com
Douglas O. Adams
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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Kelly C. Fields
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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Paul G. Held
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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James F. Harbertson
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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Abstract

A 96-well microplate reader was found to be an efficient and cost-effective tool for assaying red wines using an existing comprehensive red wine phenolics assay. This instrument increases the throughput three-fold while also reducing the time required to complete the assay. A traditional UV-vis capable spectrophotometer was used as the reference method to validate the procedure for the analysis of tannin, iron-reactive phenolics, anthocyanin, large polymeric pigment, and small polymeric pigment. The iron-reactive phenolics and anthocyanin steps were completely scaled down to microplate volume. The tannin and polymeric pigment measurements required two initial steps in microfuge tubes before transfer to the microplate. The 40 wine samples representing four different wine types were assayed and compared using the two different instruments. The average instrumental differences between microplate and spectrophotometer ranged from 1 to 6% for tannin, 1 to 5% for iron-reactive phenolics, <1 to 4% for anthocyanin, and 0.50 to 6.66% for large and small polymeric pigments. The largest discrepancies were seen in the large polymeric pigment measurements, where the greatest difference was 6.66% for the 2003 Merlot samples.

  • microplate reader
  • wine
  • tannin
  • anthocyanin
  • polymeric pigment
  • protein precipitation
  • Received May 2006.
  • Revision received July 2006.
  • Copyright © 2006 by the American Society for Enology and Viticulture
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Evaluation of a Comprehensive Red Wine Phenolics Assay Using a Microplate Reader
Theresa M. Heredia, Douglas O. Adams, Kelly C. Fields, Paul G. Held, James F. Harbertson
Am J Enol Vitic.  2006  57: 497-502  ; DOI: 10.5344/ajev.2006.57.4.497
Theresa M. Heredia
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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  • For correspondence: theredia@jpvwines.com
Douglas O. Adams
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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Kelly C. Fields
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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Paul G. Held
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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James F. Harbertson
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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Evaluation of a Comprehensive Red Wine Phenolics Assay Using a Microplate Reader
Theresa M. Heredia, Douglas O. Adams, Kelly C. Fields, Paul G. Held, James F. Harbertson
Am J Enol Vitic.  2006  57: 497-502  ; DOI: 10.5344/ajev.2006.57.4.497
Theresa M. Heredia
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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  • For correspondence: theredia@jpvwines.com
Douglas O. Adams
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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Kelly C. Fields
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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Paul G. Held
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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James F. Harbertson
1Associate winemaker, Freestone, 3Quality control specialist, Joseph Phelps Vineyards, 200 Taplin Rd., St. Helena, CA 94574; 2Associate professor, Department of Viticulture and Enology, University of California, Davis, CA 95616; 4Senior scientist, Bio-Tek Instruments, Highland Park, Winooski, VT 05404; 5Extension enologist, Washington State University, Prosser Irrigated Agriculture Research Extension Center (IAREC), Prosser, WA 99350.
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