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The determination of tocopherols in vegetable oils by square‐wave voltammetry
Author(s) -
Clough Amy E.
Publication year - 1992
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02540948
Subject(s) - detection limit , tocopherol , differential pulse voltammetry , chemistry , voltammetry , sunflower , chromatography , sunflower oil , high performance liquid chromatography , canola , resolution (logic) , cyclic voltammetry , vegetable oil , analytical chemistry (journal) , corn oil , antioxidant , electrode , food science , electrochemistry , mathematics , organic chemistry , vitamin e , combinatorics , artificial intelligence , computer science
Square‐wave voltammetry (SWV) has been applied to the determination of tocopherol concentrations in eight vegetable oils: canola, corn, olive, peanut, safflower, sesame, soybean, and sunflower. This technique has a lower limit of detection and somewhat better resolution than differential‐pulse voltammetry (DPV) and is significantly faster than both DPV and high‐performance liquid chromatography (HPLC), the technique most often used for tocopherol determinations. The tocopherols are oxidized at a stationary glassy carbon electrode as its potential is scanned from 0.40 to 1.00 V vs Ag/AgCl at a rate of 20 mV/s. The currents that arise from these oxidations are directly proportional to the tocopherols’ concentrations. A standard addition method is used to determine the tocopherol contents of the oils listed. Under the conditions employed, the limit of detection is 10 mg/L tocopherol in oil.