Identification and Quantitative Analysis of 2-Methyl-4-propyl-1,3-oxathiane in Wine
Identification and Quantitative Analysis of 2-Methyl-4-propyl-1,3-oxathiane in Wine
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DOI：
10.1021/acs.jafc.8b04027
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发表时间：
2018-10-17
影响因子：
6.1
通讯作者：
Jeffery, David W.
中科院分区：
文献类型：
--
作者：
Chen, Liang;Capone, Dimitra L.;Jeffery, David W.
基于葡萄酒的化学性质和3-磺酰己烯-1-醇（3-SH）与乙醛的共现，我们研究了2-甲基-4-丙基-1,3-草酸烷(1)的存在，并首次在葡萄酒中发现了一种可检测的单一几何异构体顺式-1。采用顶空固相微萃取（HS-SPME）和气相色谱-质谱（GC-MS）的稳定同位素稀释法（SIDA）被开发和验证，并用于定量顺-1在葡萄酒的调查，揭示范围从不可检测（检测限= 2.6 ng/L）到460 ng/L。确定中性白葡萄酒的气味检测阈值为1（使用85%顺式-1和15%反式-1的标准）为7.1 μ g/L。尽管在所研究的葡萄酒中，顺式-1没有出现在确定的感官阈值之上，但研究结果表明，存在一种新的挥发性硫化合物，与3-SH浓度有很强的相关性（r = 0.72），表明顺式-1对重要的葡萄酒香气化合物3-SH的命运有潜在的影响。
On the basis of the chemistry of wine and the co-occurrence of 3-sulfanylhexan-1-ol (3-SH) and acetaldehyde, we investigated the existence of 2-methyl-4-propyl-1,3-oxathiane (1) and identified the presence of a single detectable geometric isomer, cis-1, in wines for the first time. A stable isotope dilution assay (SIDA) using headspace-solid-phase microextraction (HS-SPME) and gas chromatography-mass spectrometry (GC-MS) was developed and validated, and used to quantitate cis-1 in a survey of wines, revealing a range from undetectable (limit of detection = 2.6 ng/L) to 460 ng/L. The odor detection threshold of 1 (using a standard comprising 85% cis-1 and 15% trans-1) in neutral white wine was determined to be 7.1 mu g/L. Despite cis-1 not appearing above the determined sensory threshold in the studied wines, the findings demonstrated the presence of a new volatile sulfur compound with a strong correlation to 3-SH concentration (r = 0.72), showing that cis-1 has potential implications for the fate of the important wine aroma compound 3-SH.