建立了气相色谱法(GC)同时检测人唾液中7种短链脂肪酸(Short-chain fatty acids, SCFAs)含量的方法。唾液样品与乙醇溶液按体积比1:1混合(含0.5%(V/V)浓HCl)涡旋混合,离心后取上清液进行GC分析。采用DB-FFAP毛细管柱(30 m×0.25 mm×0.25μm)进行分离;氢火焰离子化检测器(FID)进行检测,内标法定量。实验结果表明,唾液中共检测到7种SCFAs(乙酸、丙酸、异丁酸、丁酸、异戊酸、戊酸、己酸),7种SCFAs与内标物2-乙基丁酸的色谱峰峰面积比值与其浓度均呈现良好的线性关系(R2≥0.999),检出限(LOD,S/N=3)和定量限(LOQ,S/N=10)分别为0.060~0.198μg/mL和0.180~0.594μg/mL,平均加样回收率为94.8%~109.7%(RSD≤4.3%)。本方法简单、快速、准确,可用于测定人的唾液中短链脂肪酸的含量。
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