title: Simple high-performance liquid chromatographic method for the determination of tocotrienols in human plasma.
abstract: A simple high-performance liquid chromatographic method using fluorescence detection was developed for the determination of vitamin E especially delta-, gamma- and alpha-tocotrienols in human plasma. The method entailed direct injection of plasma sample after deproteinization using a 3:2 mixture of acetonitrile-tetrahydrofuran. The mobile phase comprised 0.5% (v/v) of distilled water in methanol. Analyses were run at a flow-rate of 1.5 ml/min with the detector operating at an excitation wavelength of 296 nm and emission wavelength of 330 nm. This method is specific and sensitive, with a quantification limit of approximately 40, 34 and 16 ng/ml for alpha-, gamma- and delta-tocotrienol, respectively. The mean absolute recovery values were about 98% while the within-day and between-day relative standard deviation and percent error values of the assay method were all less than 12.0% for alpha-, gamma- and delta-tocotrienol. The calibration curve was linear over a concentration range of 40-2500, 30-4000 and 16-1000 ng/ml for alpha-, gamma- and delta-tocotrienol, respectively. Application of the method in a bioavailability study for determination of the above compounds was also demonstrated.
authors.affiliation: School of Pharmaceutical Sciences, University of Science Malaysia, Penang.
authors.forename: S P
authors.initials: SP
authors.lastname: Yap
authors.forename: T
authors.initials: T
authors.lastname: Julianto
authors.forename: J W
authors.initials: JW
authors.lastname: Wong
authors.forename: K H
authors.initials: KH
authors.lastname: Yuen
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D008297:Male; D012016:Reference Values; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet; D014810:Vitamin E / Q000097:blood* / Q000493:pharmacokinetics
chemical_list: D014810:Vitamin E