Quantitation of the Intense Aroma Compound 3-Mercapto-2-methylpentan-1-ol in Raw and Processed Onions (<i>Allium cepa</i>) of Different Origins and in Other <i>Allium</i> Varieties Using a Stable Isotope Dilution Assay
作者:Michael Granvogl、Monika Christlbauer、Peter Schieberle
DOI:10.1021/jf049874l
日期:2004.5.1
A stable isotope dilution assay was developed for the quantitation of the potent onion odorant 3-mercapto-2-methylpentan-1-ol (1) using mass chromatography and synthesized [(2)H(2)]-3-mercapto-2-methylpentan-1-ol as the internal standard. Application of the newly developed method on onions from different origins revealed amounts between 8 and 32 microg/kg in raw onions, whereas 34-246 microg was found
开发了一种稳定的同位素稀释测定法,用于使用质谱色谱法定量有效的洋葱气味剂3-mercapto-2-methylpentan-1-ol(1),并合成了[[2] H(2)]-3-mercapto-2-甲基戊-1-醇为内标。对来自不同来源的洋葱应用新开发的方法后,发现生洋葱中的洋葱量介于8到32微克/千克之间,而切片,储存(50分钟)然后煮熟的洋葱中发现了34-246微克/千克。在通过同时进行水蒸气蒸馏萃取而制备的提取物中,形成的最高浓度为1,> 1200 microg / kg。煮熟的洋葱中3-巯基-2-甲基戊-1-醇的含量高得多,表明它是由特定的,但未知的,在切割生洋葱过程中酶促形成的前体形成的。