This study describes a fully automated procedure using alkaline hydrolysis and headspace (HS) solid-phase microextraction (SPME) followed by onfiber derivatization and gas chromatographic (GC)-mass spectrometric (MS) detection of amphetamine, methamphetamine, methylendioxyamphetamine, methylendioxymethamphetamine, methylendioxyethylamphetamine, methylendioxyphenylbutanamine, and methylmethylendioxyphenylbutanamine in human hair samples. Ten milligrams of hair is washed with deionized water, petroleum ether, and dichloromethane. After the addition of deuterated internal standards the sample is hydrolyzed with sodium hydroxide and directly submitted to HS-SPME. After the absorption of analytes for an on-fiber derivatization procedure the fiber is directly placed into the HS of a second vial containing N-methyl-bis(trifluoroacetamide) before GC-MS analysis. The limits of detection are determined between 0.01 and 0.17 ng/mg. Absolute analyte recoveries are in the range between 0.3% and 7.5%. Linearity is proven over a range from 0.1 to 50 ng/mg with coefficients of correlation from 0.998 to 1. In comparison with conventional methods of hair analysis, this fully automated HS-SPME-GC-MS procedure is substantially faster and easier to perform without using solvents. It uses minimal sample amounts and has the same degree of sensitivity and reproducibility.
本研究介绍了一种全自动程序,利用碱性
水解和顶空 (HS) 固相微萃取 (
SPME),然后在纤维上进行衍生和气相色谱 (GC) - 质谱 (MS) 检测人体毛发样品中的
苯丙胺、
甲基苯丙胺、
甲苯二
氧基
苯丙胺、
甲苯二
氧基
甲基苯丙胺、
甲苯二
氧基
乙基苯丙胺、
甲苯二
氧基
苯基
丁胺和
甲基甲苯二
氧基
苯基
丁胺。用去离子
水、石油醚和
二氯甲烷洗涤 10 毫克的头发。加入氚代内标后,用
氢氧化钠对样品进行
水解,然后直接送入 HS-
SPME。纤维上衍生程序吸收分析物后,直接将纤维放入第二个含有 N-
甲基双(三
氟乙
酰胺)的小瓶的 HS 中,然后进行气相色谱-质谱分析。检测限在 0.01 至 0.17 纳克/毫克之间。分析物的绝对回收率在 0.3% 到 7.5% 之间。与传统的毛发分析方法相比,这种全自动 HS-
SPME-GC-MS 程序速度更快,操作更简便,无需使用溶剂。它使用的样品量极少,灵敏度和重现性相同。