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J Chromatogr A 1999, 862, 199). These derivatives were shown to have plump babes a high thermal and hydrolytic stability and they improve plump babes the sensitivity and the selectivity of the analyses. Procedure : To fatty acids dissolved in 200 ml of hexane, a known amount of internal standard solution, 75 ml of N-methyl-N-(ter-butyldimethylsilyl)trifluoroacetamide and 5 ml of triethylamine are added. After tightly capping, the contents are maintained at 75°C for 30 min before injection. The separation is done with a HP-1 capillary column (50 m x 0.2 mm ID) with a temperature program as follows : 40°C for plump babes 1 min and then after increasing to 70°C with 60°C/min, held for 2 mn. After increasing to 205°C with 5°C/min, held for 25 min and then increased to 285°C with 5°C/min and held for 1 min.
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