Analysis of tocopherols and phytosterols in vegetable oils by HPLC with evaporative light-scattering detection

Methods were developed for the separation, detection, and quantification of tocopherols and phytosterols by high-performance liquid chromatography with an evaporative light-scattering detector. Four tocopherols— α, β, γ and δ—and four phytosterols—campesterol, β-sitosterol, brassicasterol, and stigmasterol—were analyzed in soybean, sunflower, low-erucic acid rapeseed (LEAR) and corn oils. The use of an evaporative light-scattering detector, in conjunction with modification of methods from the literature to prepare and analyze tocopherols and phytosterols by HPLC, showed consistent results between trials and levels of these minor constituents. Presented at the Annual American Oil Chemists' Society Meeting, May 3–7, 1989, Cincinnati, OH.     

应用气相色谱测定化妆品中β-谷甾醇、豆甾醇与菜油甾醇的方法研究

建立了以气相色谱定量测定化妆品中β-谷甾醇、豆甾醇和菜油甾醇3种植物甾醇含量的方法。化妆品样品以5-α-胆甾烷为内标,通过氢氧化钾-乙醇溶液皂化、正己烷提取、硅烷化衍生后,采用毛细管气相色谱柱分离,氢火焰离子化检测器（FID）定量检测。3种植物甾醇的线性相关系数（R2）均〉0.9990,以信噪比S/N=3计算的β-谷甾醇、豆甾醇和菜油甾醇最低检出浓度分别为1.06 mg/L、0.86 mg/L和0.78 mg/L,样品加标回收率在76%～118%之间,相对标准偏差为0.8%～6.1%。