A GC FID method was developed for simultaneous analysis of oleic acid and related fatty acids in oleic acid USP-NF material. The sample preparation procedure was simple and straightfor- ward with no derivatization required. Fifteen fatty acids were separated using a DB-FFAP (nitroterephthalic acid modi ed polyethylene glycol) capillary GC column with a total run time of 20 min. The method is free of interference from the diluent used in oleic acid USP-NF material preparation and demonstrates speci city for all 15 fatty acids. The sensitivity shows that the method is applicable for the analysis of oleic acid USP-NF ma- terial. In addition, the precision for the assay of each related fatty acid is acceptable.
The method was validated and proved to be speci c, precise and accurate for analysis of oleic acid and related fatty acids. Ap- plications of this method to oleic acid NF materials indicated that the method can be used as a quality control method for oleic acid NF materials.