DETERMINAÇÃO DE ACETOÍNA E METANOL EM VINAGRES DE VINHO BRASILEIROS

Visou-se a caracterização do vinagre de vinho brasileiro, mediante determinação do teor de acetoína e de metanol. Analisaram-se 29 amostras de diferentes marcas comerciais de vinagre de vinho tinto e 18 de vinagre de vinho branco. As análises de acetoína e de metanol foram efetuadas mediante cromatografia a gás. Constatou-se variabilidade acentuada no teor de acetoína e de metanol do vinagre de vinho brasileiro. Detectou-se que 61,0% dos vinagres de vinho branco e 39,4% dos vinagres de vinho tinto apresentaram menos de 40 mg/L de acetoína. Observou-se, também, que 66,6% dos vinagres de vinho branco apresentaram menos de 25 mg/L de metanol e 53,6% dos vinagres de vinho tinto menos de 50 mg/L. O estabelecimento de limite mínimo pela legislação brasileira para a acetoína e o metanol do vinagre de vinho contribuiria para a determinação da genuinidade desse produto. A cromatografia a gás mostrou-se adequada para a determinação da acetoína e do metanol nos vinagres de vinho. DETERMINATION OF ACETOIN AND METHANOL IN BRAZILIAN WINE VINEGARS Abstract The aim of this work was to characterize Brazilian wine vinegars, by determination of acetoin and methanol content. Twenty-nine samples of different commercial red wine vinegars and 18 samples of white wine vinegars were analysed. The analyses of acetoin and methanol were made by gas chromatography. High variability in the acetoin and methanol contents were observed. It was remarked that 61.0% of the white wine vinegars and 39.4% of the red wine vinegars showed less than 40 mg/L of acetoin. It was showed that 66.6% of the white wine vinegars showed less than 25 mg/L of methanol and 53.6% of the red wine vinegars had less than 50 mg/L of this alcohol. The setting up of limitation by Brazilian legislation for the acetoin and methanol in the vinegar components contribute to its genuinity. The gas chromatography showed to be suitable, for acetoin and methanol determination in wine vinegars.