中国科技论文在线

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2007年09月28日

【期刊论文】Voltammetric Behavior and Determination of Tocopherol in Vegetable Oils at a Polypyrrole Modified Electrode

李书国， Shu-Guo Li，， Wen-Tong Xue， Hui Zhang

Electroanalysis 18, 2006, No. 23, 2337-2342，-0001，（）：

-1年11月30日

The voltammetric behavior of a-tocopherol in the presence of vegetable oil is studied at a polypyrrole modified Pt electrode in a 1, 2-dichloroethane-ethanol medium with cyclic voltammetry. Cyclic voltammogram of a-tocopherol showed a well-defined oxidation peak; the peak potential shifting toward less positive and a much higher peak current obtained at a polypyrrole modified electrode than that obtained at the unmodified Pt electrode. An electroanalytical method for the determination of a-tocopherol based on its electrochemical oxidation at the polypyrrole modified Pt electrode is developed. Using differential pulse voltammetry, the peak currents were found to increase linearly with the a-tocopherol concentration over the range of 5.0 to 300

Tocopherols， Voltammetry， Polypyrrole modified electrode， Vegetable oil analysis

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2007年09月28日

【期刊论文】超临界CO2萃取天然VE的最佳工艺条件研究

李书国，李雪梅，陈辉，杜进民

食品工业科技Vol. 24, No. 11, 2003，-0001，（）：

-1年11月30日

摘要

基于超临界流体萃取原理，分析了影响超临界CO2流体萃取小麦胚芽中天然VE的主要因素，它们包括萃取压力、温度、时间、CO2流量、小麦胚芽水分含量、粒度和VE的种类及结构特征等。通过四因素四水平的正交试验和单因素试验研究了天然VE的萃取量与各因素之间的关系，并确定了最佳的试验条件为：萃取压力29～36Mpa、温度为38～40°C、时间为2～3h，CO2流量16kg/h，小麦胚芽水分含量5.0%，粒度20～30目。

小麦胚芽，超临界CO2流体，萃取，天然VE