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Related Experiment Videos

Two-parameter determination in vinegar by a flow injection-pervaporation system.

J González-Rodríguez1, P Pérez-Juan, M D Luque de Castro

  • 1R&D Department, Pérez Barquero S.A., Montilla, Cordoba, Spain.

The Analyst
|August 2, 2001
PubMed
Summary

A new flow injection method enables sequential determination of ethanol and acetic acid in vinegar. This analytical chemistry advancement offers accurate results for food quality control.

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Area of Science:

  • Analytical Chemistry
  • Food Chemistry
  • Chemical Engineering

Background:

  • Accurate quantification of ethanol and acetic acid is crucial for vinegar quality control.
  • Traditional methods for analyzing vinegar components can be time-consuming and complex.
  • Flow injection analysis (FIA) offers a potential for rapid and automated chemical analysis.

Purpose of the Study:

  • To develop and optimize a sequential flow injection (FI) method for the simultaneous determination of ethanol and acetic acid in vinegar.
  • To validate the efficiency and accuracy of the proposed FI method against established reference techniques.

Main Methods:

  • Sequential determination using flow injection analysis (FIA).
  • Ethanol determination via potassium dichromate (K2Cr2O7) oxidation.

Related Experiment Videos

  • Acetic acid determination through acid-base titration with Thymol Blue indicator.
  • Photometric detection at 600 nm using a single detector.

    • Main Results:

    • The method achieved linear determination ranges of 0-12% v/v for ethanol and 0-10% for acetic acid.
    • The sequential FI method demonstrated a sample throughput of seven samples per hour.
    • Analysis of real vinegar samples showed excellent agreement with reference methods.

    Conclusions:

    • The developed sequential flow injection method provides a rapid, accurate, and efficient approach for analyzing ethanol and acetic acid in vinegar.
    • This method is suitable for routine quality control in the food industry.
    • The single-detector photometric monitoring simplifies the analytical procedure.