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A flow-based platform for measuring the acidity parameters in wine.

Susana S M P Vidigal1, António O S S Rangel1

  • 1Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobão Vital, Apartado 2511, 4202-401 Porto, Portugal.

Talanta
|April 11, 2017
PubMed
Summary
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A new sequential injection analysis (SIA) system offers rapid measurement of volatile and total acidity in wine using bromothymol blue. This tool provides accurate results with minimal sample handling, benefiting the winemaking industry.

Area of Science:

  • Analytical Chemistry
  • Food Science
  • Instrumentation

Background:

  • Acidity is a critical parameter in winemaking, influencing flavor and stability.
  • Traditional methods for acidity measurement can be time-consuming and require extensive sample preparation.

Purpose of the Study:

  • To develop a rapid and efficient analytical method for determining volatile and total acidity in wine.
  • To utilize a sequential injection analysis (SIA) system for simplified acidity quantification.

Main Methods:

  • A sequential injection analysis (SIA) system coupled with spectrophotometric detection was employed.
  • Bromothymol blue (BTB) was used as a colorimetric reagent for acidity detection.
  • A gas-diffusion unit was integrated for the separation of volatile acids.
Keywords:
Bromothymol blueGas-diffusion unitSequential injection analysis systemSpectrophotometryTable white wine

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Main Results:

  • The SIA system demonstrated rapid response times and low sample/reagent consumption.
  • Accurate quantification of volatile acidity (VA) and total acidity (TA) was achieved.
  • High determination rates (35 VA/hr, 62 TA/hr) and low limits of detection were obtained.

Conclusions:

  • The proposed SIA method is a valuable tool for the winemaking industry, offering a fast and reliable way to measure wine acidity.
  • The system successfully quantified volatile, total, and fixed acidity in wine samples, with results comparable to reference methods.