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脂溶性维生素脂溶性维生素A 和E 由于缺乏易于还原的基团且因其氧化反应产生的电势不能用汞电极检测,故难以用极谱法测定;碳电极检测的电势范围约在+2.0 V,而使维生素A 和E 的伏安法测定成为可能。Atuma 等所研制的碳糊电极可用于多种有机溶剂中而不溶解;用金属线从电极上切去一小片碳糊就可制得一新电极。这种碳糊电极可适用于药品制剂或油剂中维生素E
Fat-soluble vitamins Liposoluble vitamins A and E are difficult to determine by polarography because of the lack of readily reducible groups and the potential resulting from their oxidation reaction that can not be detected with mercury electrodes; the potential range for carbon electrode detection is about +2.0 V, The voltammetric determination of vitamins A and E is possible. The carbon paste electrode developed by Atuma et al. Can be used in a variety of organic solvents without dissolution; a new electrode can be made by cutting a small piece of carbon paste from the electrode with a metal wire. This carbon paste electrode can be used in pharmaceutical preparations or oil vitamin E