Comparative analysis of the organic acid content of vinegar by capillary electrophoresis and ion-exclusion chromatography with conductimetric detection

Abstract

SummaryIon-exclusion chromatography (IEC) and capillary electrophoresis (CE) have been compared for determination of organic acids in samples of Sherry wine vinegar. The accuracy of each technique was evaluated by use of the standard addition method. There were no differences belvveen the techniques at a significance level of 5%, except for determination of malic acid by CE. Both analytical methods were used to analyse sixteen samples of Sherrywine vinegar supplied by different producers. The regression coefficients (r ~) for analysis by IEC and CE exceeded 0.94 for all acids. Results from both methods were in good agreement and the methods are sufficiently selective and sensitive to be applied directly to sherrywine vinegars.

Determination of organic acids by capillary electrophoresis with simultaneous addition of Ca and Mg as complexing agents

“…must, wine, brandy [30], and vinegar [31] from the Jerez region. We validated the method for these real samples by comparing the slopes obtained by use of standards and those obtained by the method of standard additions.…”

Determination of the Free Amino Acid, Organic Acid, and Nucleotide in Commercial Vinegars

“…Organic acids are the major taste compounds in vinegar, which can be directly tasted by people. The level and purity of the organic acids presented in a particular kind of vinegar can provide information both about its origin and about the processing and aging techniques to which it has been subjected (Castro and others ). Most organic acids are generated from fermentation, and minors are from the raw material.…”

Capillary electrophoresis for short‐chain organic acids and inorganic anions in different samples

“…Electrokinetic sample introduction with transient isotachophoretic preconcentration was optimized for peak height, peak area, peak asymmetry, efficiency, peak resolution, and reproducibility of migration time and peak area for the ultratrace determination of anions on silicon wafer surfaces [82]. The detection limit was 10 nmol?L 21 and results agreed with those obtained by ion chromatography (IC). Nevertheless, except for samples with a constant matrix, the use of electrokinetic injection enhances CE sensitivity, but it suffers from matrix bias and poorer precision and, therefore, it is not recommended for quantification.…”