Development and validation of a reversed-phase ion-pair liquid chromatography method for the determination of magnesium ascorbyl phosphate and melatonin in cosmetic creams

详细信息    查看全文

• 作者：Athanasia Varvaresou ; Efthimios Tsirivas ; Kritonas Iakovou ; Evagelos Gikas ; Zaxarias Papathomas ; Ariadni Vonaparti ; Irene P ; eri
• 关键词：Magnesium ascorbyl phosphate ; Melatonin ; Ion-pair liquid chromatography ; Cosmetics
• 刊名：Analytica Chimica Acta
• 出版年：2006
• 出版时间：28 July 2006
• 年：2006
• 卷：573-574
• 期：Complete
• 页码：284-290
• 全文大小：250 K

文摘

A reversed-phase ion-pair high-performance liquid chromatographic method was developed and validated for the determination of magnesium ascorbyl phosphate and melatonin in cosmetic creams. The determination was performed on a BDS C 18 analytical column (250 × 4.6 mm i.d., 5 μm particle size); the mobile phase consisted of 0.020 M tetrabutylammonium hydroxide and 0.025 M potassium dihydrogen phosphate (pH 6.8) mixed with acetonitrile in a ratio (77:23, v/v) and pumped at a flow rate 1.00 ml min⁻¹. The UV detector was operated at 260 nm. The retention times of the magnesium ascorbyl phosphate, melatonin and chlorthalidone that was used as internal standard, were 6.55, 9.18 and 11.07 min, respectively. Calibration graphs are linear (r better than 0.9990, n = 6), in concentration range 1.00–10.00 μg ml⁻¹ for magnesium ascorbyl phosphate and 0.63–6.25 μg ml⁻¹ for melatonin. The intra- and inter-day R.S.D. values were less than 6.0 % , while the relative percentage error E_r was less than 3.5 % (n = 5). The quantitation limits were 0.69 and 0.47 μg ml⁻¹, for magnesium ascorbyl phosphate and melatonin, respectively. The method was applied to the analysis of a cosmetic cream and proved to be suitable for rapid and reliable quality control.