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Related Concept Videos

Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...

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New Methods to Study Gustatory Coding
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New method for evaluating astringency in red wine.

María C Llaudy1, Roser Canals, Joan-Miquel Canals

  • 1Departament de Bioquímica i Biotecnologia, Facultat d'Enologia de Tarragona, (CeRTA), Universitat Rovira i Virgili, C/Ramón y Cajal 70, 43005 Tarragona, Spain.

Journal of Agricultural and Food Chemistry
|February 19, 2004
PubMed
Summary
This summary is machine-generated.

A new method using ovalbumin offers a more reproducible and accurate way to measure red wine astringency compared to traditional methods. This advancement improves wine quality assessment by providing reliable sensory attribute data.

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Area of Science:

  • Enology and Viticulture
  • Analytical Chemistry
  • Food Science

Background:

  • Astringency is a key sensory attribute in red wine, crucial for quality assessment.
  • Current methods like sensory analysis and the gelatin index lack reproducibility and accuracy.
  • The gelatin index, relying on heterogeneous gelatin and acid hydrolysis, provides only approximate procyanidin concentration.

Purpose of the Study:

  • To develop a novel, reproducible, and accurate method for quantifying red wine astringency.
  • To compare the proposed method with existing techniques, including sensory analysis and the gelatin index.
  • To establish a reliable measurement for procyanidin concentration related to astringency.

Main Methods:

  • Development of a new precipitation method using ovalbumin as the precipitating agent.
  • Utilization of tannic acid solutions as standards for calibration.
  • Statistical analysis to assess reproducibility and correlation with sensory data.

Main Results:

  • The proposed ovalbumin method demonstrated high reproducibility with a relative standard deviation (RSD) of 5%.
  • The gelatin index method showed significantly lower reproducibility with an RSD of 12%.
  • The new method exhibited a better correlation with sensory analysis compared to the gelatin index.

Conclusions:

  • The ovalbumin precipitation method is a superior alternative for reproducible astringency determination in red wine.
  • This method offers a more accurate assessment of procyanidin concentration, improving wine quality control.
  • The findings support the adoption of this new technique for reliable wine analysis.