期刊
JOURNAL OF CHROMATOGRAPHY A
卷 880, 期 1-2, 页码 93-99出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0021-9673(00)00262-4
关键词
must; food analysis; headspace analysis; wine; extraction methods; alkylmethoxypyrazines; pyrazines; aroma compounds
A method for determining 2-methoxypyrazine, 3-methyl-, 3-ethyl-, 3-isopropyl-, 3-sec.-butyl- and 3-isobutyl-2-methoxypyrazine in musts is described. It involves headspace solid-phase microextraction (SPME) and determination by capillary gas chromatography using nitrogen-phosphorous detection. Pyrazines were satisfactorily separated under isothermal conditions, and quantification was carried out using 3-isopropyl-2-ethoxypyrazine as the internal standard. Ionic strength, time and temperature were studied in order to make SPME as efficient as possible. The developed method enabled detection limits at the 0.1 ng l(-1) levels for some of the analytes. The method was successfully applied to identify and quantify different 3-alkyl-2-methoxypyrazines in experimental musts of Cabernet Sauvignon and Merlot. Their evolution during the ripening was also monitored. (C) 2000 Elsevier Science B.V. All rights reserved.
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