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通过顶空固相微萃取-高分辨气相色谱-同位素比率质谱分析法对乙醇的13C/12C和18O/16O比率进行龙舌兰酒真伪评估。

Tequila authenticity assessment by headspace SPME-HRGC-IRMS analysis of 13C/12C and 18O/16O ratios of ethanol.

作者信息

Aguilar-Cisneros Blanca O, López Mercedes G, Richling Elke, Heckel Frank, Schreier Peter

机构信息

Lehrstuhl für Lebensmittelchemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.

出版信息

J Agric Food Chem. 2002 Dec 18;50(26):7520-3. doi: 10.1021/jf0207777.

DOI:10.1021/jf0207777
PMID:12475264
Abstract

By use of headspace SPME sampling and a PLOT column, on-line capillary gas chromatography-isotope ratio mass spectrometry was employed in the combustion (C) and the pyrolysis (P) modes (HRGC-C/P-IRMS) to determine the delta(13)C(VPDB) and delta(18)O(VSMOW) values of ethanol in authentic (n = 14) and commercial tequila samples (n = 15) as well as a number of other spirits (n = 23). Whereas with delta(13)C(VPDB) values ranging from -12.1 to -13.2 per thousand and from -12.5 to -14.8 per thousand similar variations were found for 100% agave and mixed tequilas, respectively, the delta(18)O(VSMOW) data differed slightly within these categories: ranges from +22.1 to +22.8 per thousand and +20.8 to +21.7 per thousand were determined for both the authentic 100% agave and mixed products, respectively. The data recorded for commercial tequilas were less homogeneous; delta(13)C(VPDB) data from -10.6 to -13.9 per thousand and delta(18)O(VSMOW) values from +15.5 to +22.7 per thousand were determined in tequilas of both categories. Owing to overlapping data, attempts to differentiate between white, rested, and aged tequilas within each of the two categories failed. In addition, discrimination of tequila samples from other spirits by means of delta(13)C(VPDB) and delta(18)O(VSMOW) data of ethanol was restricted to the products originating from C(3) as well as C(4)/CAM raw materials.

摘要

通过顶空固相微萃取（SPME）采样和多孔层开管（PLOT）柱，采用在线毛细管气相色谱-同位素比率质谱联用仪，在燃烧（C）和热解（P）模式下（高分辨气相色谱-C/P-IRMS），测定了14个真品龙舌兰酒样品、15个市售龙舌兰酒样品以及23个其他烈酒样品中乙醇的δ(13)C(VPDB)和δ(18)O(VSMOW)值。对于100%龙舌兰酒和混合龙舌兰酒，δ(13)C(VPDB)值分别在-12.1‰至-13.2‰和-12.5‰至-14.8‰范围内呈现相似变化，而δ(18)O(VSMOW)数据在这两类酒中略有不同：真品100%龙舌兰酒和混合产品的δ(18)O(VSMOW)值范围分别为+22.1‰至+22.8‰和+20.8‰至+21.7‰。市售龙舌兰酒记录的数据同质性较差；两类龙舌兰酒的δ(13)C(VPDB)数据范围为-10.6‰至-13.9‰，δ(18)O(VSMOW)值范围为+15.5‰至+22.7‰。由于数据重叠，在这两类酒中区分白色、静置和陈酿龙舌兰酒的尝试均告失败。此外，利用乙醇的δ(13)C(VPDB)和δ(18)O(VSMOW)数据区分龙舌兰酒样品与其他烈酒，仅限于源自C(3)以及C(4)/景天酸代谢（CAM）原料的产品。

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