Wong Yong Foo, Makahleh Ahmad, Saad Bahruddin, Ibrahim Mohamad Nasir Mohamad, Rahim Afidah Abdul, Brosse Nicolas
School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
Talanta. 2014 Dec;130:299-306. doi: 10.1016/j.talanta.2014.07.021. Epub 2014 Jul 15.
A sensitive and rapid reversed-phase ultra performance liquid chromatographic (UPLC) method for the simultaneous determination of tocopherols (α-, β-, γ-, δ-), tocotrienols (α-, β-, γ-, δ-), α-tocopherol acetate and α-tocopherol nicotinate is described. The separation was achieved using a Kinetex pentafluorophenyl (PFP) column (150 × 2.1mm, 2.6 µm) with both photodiode array (PDA) and fluorescence (FL) detectors that were connected in series. Column was thermostated at 42°C. Under a gradient system consisting of methanol and water at a constant flow rate of 0.38 mL min(-1), all the ten analytes were well separated in less than 9.5 min. The method was validated in terms of linearity, limits of detection and quantitation, precision and recoveries. Calibration curves of the ten compounds were well correlated (r(2)>0.999) within the range of 100 to 25,000 μg L(-1) for α-tocopherol acetate and α-tocopherol nicotinate, 10 to 25,000 μg L(-1) for α-tocotrienol and 5 to 25,000 μg L(-1) for the other components. The method is simple and sensitive with detection limits (S/N, 3) of 1.0 to 3.0 μg L(-1) (FL detection) and 30 to 74 μg L(-1) (PDA detection). Relative standard deviations for intra- and inter-day retention times (<1%) and peak areas (≤ 4%) were obtained. The method was successfully applied to the determination of vitamin E in vegetable oils (extra virgin olive, virgin olive, pomace olive, blended virgin and refined olive, sunflower, soybean, palm olein, carotino, crude palm, walnut, rice bran and grape seed), margarines and supplements.
本文描述了一种灵敏、快速的反相超高效液相色谱(UPLC)方法,用于同时测定生育酚(α-、β-、γ-、δ-)、生育三烯酚(α-、β-、γ-、δ-)、α-生育酚醋酸酯和α-生育酚烟酸酯。使用Kinetex五氟苯基(PFP)柱(150×2.1mm,2.6μm)进行分离,串联连接光电二极管阵列(PDA)和荧光(FL)检测器。柱温保持在42°C。在由甲醇和水组成的梯度系统中,以0.38 mL min(-1)的恒定流速,所有十种分析物在不到9.5分钟内得到良好分离。该方法在线性、检测限和定量限、精密度和回收率方面进行了验证。十种化合物的校准曲线在100至25,000 μg L(-1)范围内(α-生育酚醋酸酯和α-生育酚烟酸酯)、10至25,000 μg L(-1)范围内(α-生育三烯酚)以及5至25,000 μg L(-1)范围内(其他成分)具有良好的相关性(r(2)>0.999)。该方法简单灵敏,检测限(S/N,3)为1.0至3.0 μg L(-1)(FL检测)和30至74 μg L(-1)(PDA检测)。获得了日内和日间保留时间(<1%)和峰面积(≤4%)的相对标准偏差。该方法成功应用于植物油(特级初榨橄榄油、初榨橄榄油、橄榄果渣油、混合初榨和精炼橄榄油、向日葵油、大豆油、棕榈油、胡萝卜素油、粗棕榈油、核桃油、米糠油和葡萄籽油)、人造黄油和补充剂中维生素E的测定。