Lubran Meryl B, Lawless Harry T, Lavin Edward, Acree Terry E
Department of Food Science, Cornell University, Ithaca, New York 14850, USA.
J Agric Food Chem. 2005 Oct 19;53(21):8325-7. doi: 10.1021/jf0511594.
Taste threshold tests of ferrous sulfate (FeSO4) solutions have been confounded by the presence of putative odorants. To detect the presence of odorants released from these solutions solid-phase microextraction (SPME) was used to collect volatiles in the headspace above FeSO4 solutions. Gas chromatography-olfactometry of samples collected over three time periods (1, 5, and 16 h) and at two temperatures (22 and 37 degrees C) revealed the presence of several metallic-smelling odorants in the headspace. Using authentic standards, two of the odorants were conclusively identified as 1-octen-3-one and 1-nonen-3-one. Trace levels of other odorants were also detected, but dilution experiments indicated that 1-nonen-3-one was at least 10 times more potent than anything else released from the solutions. 1-Octen-3-one and 1-nonen-3-one are excellent candidates for the metallic odor responses often observed in threshold testing of solutions of FeSO4.
硫酸亚铁（FeSO4）溶液的味觉阈值测试因可能存在的气味剂而变得复杂。为了检测这些溶液释放出的气味剂，采用固相微萃取（SPME）收集硫酸亚铁溶液上方顶空中的挥发性物质。对在三个时间段（1小时、5小时和16小时）以及两个温度（22摄氏度和37摄氏度）下收集的样品进行气相色谱 - 嗅觉测定，结果表明顶空中存在几种有金属气味的气味剂。使用标准品，其中两种气味剂被明确鉴定为1 - 辛烯 - 3 - 酮和1 - 壬烯 - 3 - 酮。还检测到了痕量水平的其他气味剂，但稀释实验表明，1 - 壬烯 - 3 - 酮的效力至少比溶液释放的其他任何物质强10倍。1 - 辛烯 - 3 - 酮和1 - 壬烯 - 3 - 酮是硫酸亚铁溶液阈值测试中经常观察到的金属气味反应的极佳候选物质。
