A quantitative GC-MS method for three major polyamines in postmortem brain cortex
作者:Gary G. Chen、Gustavo Turecki、Orval A. Mamer
DOI:10.1002/jms.1597
日期:2009.8
A quantitative method for putrescine (PUT), spermidine (SPD) and spermine (SPM) in homogenized postmortem human brain tissue is described that employs a novel, simple and rapid extractive derivatization with ethylchloroformate and trifluoroacetylation. These amines are metabolites of ornithine and are metabolically interconvertible in mammals. The method was developed to support an ongoing epidemiological study correlating these amines with the frequency of suicide. The isolation methodology is robust and requires less work and time than many previous methods. Analysis is by conventional electron ionization GC-MS with selected ion monitoring using a stable isotope-labeled analog for PUT and a chemical analog for SPD and SPM as internal standards. The time required for chromatographic analysis, about 20 min, is determined by the wide range of the relative volatilities of the derivatized polyamines. The method allows the quantitation of PUT down to 10 ng/g and SPD and SPM down to 100 and 1000 ng/g, respectively of wet tissue. Copyright © 2009 John Wiley & Sons, Ltd.
该方法采用了一种新颖、简单、快速的氯甲酸乙酯提取衍生法和三氟乙酰化法,用于定量检测匀浆人脑组织中的腐胺(PUT)、亚精胺(SPD)和精胺(SPM)。这些胺是鸟氨酸的代谢产物,在哺乳动物体内可相互转化。开发这种方法是为了支持一项正在进行的流行病学研究,该研究将这些胺与自杀频率联系起来。这种分离方法非常可靠,与许多以前的方法相比,所需的工作量和时间都更少。分析采用传统的电子电离气相色谱-质谱联用仪,使用稳定同位素标记的类似物作为 PUT 的内标,使用化学类似物作为 SPD 和 SPM 的内标,进行选择离子监测。色谱分析所需的时间约为 20 分钟,这是由衍生化多胺的相对挥发性范围宽广决定的。该方法可定量检测湿组织中低至 10 纳克/克的 PUT 以及分别低至 100 和 1000 纳克/克的 SPD 和 SPM。Copyright © 2009 John Wiley & Sons, Ltd. All Rights Reserved.