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Technical Brief

A Method for the Estimation of Alcohol in Fortified Wines Using Hydrometer Baumé and Refractometer Brix

Frank Rogerson, Charles Symington
Am J Enol Vitic. December 2006 57: 486-490; published ahead of print December 01, 2006 ; DOI: 10.5344/ajev.2006.57.4.486
Frank Rogerson
1Symington Vinhos, SA, Tr. Barão Forrester – Apartado 26, 4400 Vila Nova de Gaia, Portugal.
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  • For correspondence: fsr@symington.com
Charles Symington
1Symington Vinhos, SA, Tr. Barão Forrester – Apartado 26, 4400 Vila Nova de Gaia, Portugal.
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Abstract

A novel method for the estimation of alcoholic strength of fortified wines has been developed, linking %v/v alcohol to two simple and rapid enological measurements: refractometer apparent Brix and hydrometer apparent °Baumé. The soluble solid content of fortified wines, measured as true Brix (refractometer) and true °Baumé (hydrometer), can be estimated by the application of experimentally determined correction factors, which compensate for alcoholic obscuration. A calibration plot of true °Baumé versus true Brix, for 35 port wines, having diverse apparent °Baumé and % v/v alcohol, was linear with r2 = 0.997. Applying the obscuration formula and rewriting the equation in terms of apparent Baumé and apparent Brix, leads to an expression for alcoholic strength: % Alcohol (v/v) = 1.646 A.Brix − 2.703 A.°Baumé − 1.794. This equation permits the rapid estimation of alcohol content of young fortified wines by two simple measurements: refractometer apparent Brix and hydrometer apparent °Baumé. The method is rapid, economical and extremely portable, and is proposed as a quality-control technique for the three standard fortified wine parameters: % v/v alcohol, hydrometer apparent °Baumé, and refractometer apparent Brix.

  • fortified wine
  • apparent Brix
  • apparent °Baumé
  • true Brix
  • true °Baumé
  • Received March 2006.
  • Revision received April 2006.
  • Copyright © 2006 by the American Society for Enology and Viticulture
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Vol 57 Issue 4

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A Method for the Estimation of Alcohol in Fortified Wines Using Hydrometer Baumé and Refractometer Brix
Frank Rogerson, Charles Symington
Am J Enol Vitic.  December 2006  57: 486-490;  published ahead of print December 01, 2006 ; DOI: 10.5344/ajev.2006.57.4.486

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A Method for the Estimation of Alcohol in Fortified Wines Using Hydrometer Baumé and Refractometer Brix
Frank Rogerson, Charles Symington
Am J Enol Vitic.  December 2006  57: 486-490;  published ahead of print December 01, 2006 ; DOI: 10.5344/ajev.2006.57.4.486
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