脂肪组织和血浆标本中脂肪酸的气相色谱分析

以正十三碳酸(C13:0)和正十七碳酸(C17:0)作内标物,分别对脂肪组织和血浆中总脂肪酸、游离脂肪酸进行气相色谱分析。采用4:1甲醇-苯和氯化乙酰对样品中总脂肪酸同时作抽提和酯化,其酯化率分别是103.5％(内标物C13:0)和102.9％(内标物C17:0);对各次加入量不同的月桂酸、豆蔻酸、硬脂酸和花生酸的回收串为100.0～105.0％,重复性试验中各脂肪酸CV为1.14～8.47％。采用正已烷抽提血浆中游离脂肪酸,并以14％BF_3使甲酯化,其酯化率为103.0％(内标物C17.0),对各次加入量不同的月桂酸、豆蔻酸,硬脂酸和花生酸的回收率是82.0～105.0％。重复性试验中各脂肪酸CV为0.15～5.94％。总脂肪酸法尤为简便、迅速和可靠。

THE GC ANALYSIS OF FATTY ACID IN HUMAN ADIPOSE TISSUE AND PLASMA

The total fatty acid in adipose tissue and total and free fatty acid in plasma, using tridecanoic (Cl3:0) and heptadecanoic acid (Cl7:0) as the internal standard (IS) respectively, were analysed by GC. In analysing total fatty acid, the esterification rate was 103.53% (IS Cl3:0) and 102.86% (IS C17:0); the recovery of lauric, myristic, stearic and arachidic acid was 101.0-103,3%, 102,1-494.1%, 103,1-104.5% and 100,0-105.0%; the CV of individual fatty acid were within the range of 2.24-8.46%. In analysing free fatty acid, the esterification rate in use of C17: 0 as the IS was 102.99%; the recovery of lauric, myristic, stearic and arachidic acid was 83.5-87.3%, 96.4-99.6%, 94.3-101.9%, and 82.0-105.0% respectively, the CV of individual fatty acid were within the range of 1.41-6.21%. The procedure analysing total fatty acid is especially simple, speedy, and reliable.