title: HPTLC determination of caffeine in stimulant herbal products and power drinks.
abstract: The caffeine content of selected herbal products and energy drinks available in the Saudi market was determined by HPTLC-UV densitometric analysis. Pre-coated HPTLC silica gel plates (20cm x 10cm) were used for the analysis. The solvent system consisted of ethyl acetate-methanol (85:15, v/v), and caffeine was detected at 275nm. The developed method was validated for specificity, repeatability (C.V. < 5%), recovery (98.90 +/- 3.46), and accuracy (99.84 +/- 2.87). The levels of caffeine were 4.76-13.29% (w/w) and 0.011-0.032% (w/v), for the herbal products and the energy drinks, respectively.
authors.affiliation: Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia. abourashed@yahoo.com
authors.forename: Ehab A
authors.initials: EA
authors.lastname: Abourashed
authors.forename: Jaber S
authors.initials: JS
authors.lastname: Mossa
mesh_terms: D001628:Beverages / Q000032:analysis*; D002110:Caffeine / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D019587:Dietary Supplements / Q000032:analysis*; D028321:Plant Preparations / Q000032:analysis*
chemical_list: D028321:Plant Preparations; D002110:Caffeine