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Synthetic antioxidants in edible oils by square‐wave voltammetry on ultramicroelectrodes
Author(s) -
Ceballos Claudio,
Fernández Héctor
Publication year - 2000
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/s11746-000-0118-1
Subject(s) - chemistry , chromatography , high performance liquid chromatography , solvent , square wave , acetonitrile , voltammetry , antioxidant , edible oil , organic chemistry , electrode , electrochemistry , food science , physics , quantum mechanics , voltage
Abstract Square wave voltammetry (SWV) on carbon disk ultramicroelectrodes (UME) was used to determine antioxidants tert ‐butylhydroxyanisole (BHA) and tert ‐butylhydroxytoluene (BHT) in vegetable oils. Direct determinations were accomplished in benzene/ethanol/H 2 SO 4 solutions or in acetonitrile (ACN) after an extractive procedure. Much better recovery percentages were obtained in ACN extracts. By comparing with high‐performance liquid chromatography (HPLC) results, BHA has a slightly lower recovery percentage by the SWV technique on ACN extracts. On the other hand, BHT shows a greater recovery percentage using the methodology proposed here. The analysis time through SWV is less than an hour for a duplicated analysis while the HPLC technique needs a greater time, besides the overnight stored time required by the current methodology. The present work tends to show that SWV on carbon disk UME allows sensitive, reproducible, and faster determination of BHA, BHT, or antioxidant mixtures in oil‐solvent solutions or after a simple extractive procedure with the advantage of a higher recovery percentage. This validates the methodology as an analytical alternative for antioxidant quantification.