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Verification of the age of 10- and 20-year-old Tawny Port wines using Radiocarbon

  • 0Centre for Isotope Research (CIO), Energy and Sustainability Research Institute Groningen, University of Groningen, Nijenborgh 6, 9747 AG Groningen, the Netherlands.
Food Chemistry +

|

March 27, 2024

|

March 27, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

Radiocarbon dating (<sup>14</sup>C) can verify Port wine maturation. This study found seven out of twenty aged Tawny Port wines had shorter maturation periods than labeled, indicating potential fraud.

Area Of Science

  • Food Science
  • Analytical Chemistry
  • Oenology

Background

  • Port wine, particularly aged Tawny types (10 and 20 years), is a high-value product from Portugal's Douro region.
  • The economic incentive to misrepresent maturation periods by shortening aging times and using masking techniques is significant.
  • Accurate verification of maturation age is crucial for consumer trust and maintaining the integrity of premium Port wines.

Purpose Of The Study

  • To develop and validate a method for accurately determining the maturation period of Tawny Port wines.
  • To investigate potential fraudulent practices regarding the stated maturation ages of commercially available Tawny Port wines.

Main Methods

  • Utilized Radiocarbon (<sup>14</sup>C) age determination on both the ethanol and sugar residue components of Port wine.
  • Validated the <sup>14</sup>C dating technique using Vintage Port wines with known single harvest years.
  • Analyzed twenty commercially purchased 10- and 20-year-old Tawny Port wines from the Netherlands.

Main Results

  • The Radiocarbon (<sup>14</sup>C) dating method successfully verified maturation times in controlled Vintage Port samples.
  • Analysis revealed that seven out of twenty tested Tawny Port wines exhibited significantly shorter maturation ages than indicated on their labels.
  • These findings suggest a prevalence of misrepresentation in the commercial market for aged Tawny Port wines.

Conclusions

  • Radiocarbon (<sup>14</sup>C) dating provides a reliable scientific method to authenticate the maturation age of Port wine.
  • A notable proportion of aged Tawny Port wines in the market may not meet their stated age claims.
  • This research highlights the need for robust verification methods to combat fraud and ensure product authenticity in the wine industry.

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