University of North Florida
Browse the Citations

Contact Info

Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

View Stuart Chalk's profile on LinkedIn


Classification: Oil -> maize

Citations 2

"Preconcentration And Differential Pulse Voltammetry Of Butylated Hydroxyanisole At A Carbon Paste Electrode"
Anal. Chim. Acta 1983 Volume 154, Issue 1 Pages 87-94
Joseph Wang and Bassama A. Freiha

Abstract: Butylated hydroxyanisole (I) and tocopherols were pre-concentrated by accumulation on carbon-paste electrodes (2.5 g of Acheson graphite, grade 38, plus 1.5 g of Dow Corning silicone grease). After pre-concentration for 5 min, a detection limit of ~20 µM-I was obtained. Enhanced selectivity was achieved by transferring the electrode to an electrolytic blank solution before the measurement step; this enabled the surface-bound species to be measured without interference from species in solution The differential pulse stripping response was evaluated with respect to concentration. dependence, reproducibility, pre-concentration period, detection limit and other variables. The cited method was used in the selective detection of I in a flow injection system based on a recently developed manifold procedure (Anal. Chem., 1983, 55, 1285). The method was applied to, e.g., soft drinks, maize oil and multivitamin tablets.
Butylated hydroxyanisole Tocopherols Electrode Voltammetry Interferences Preconcentration

"Determination Of T-butylhydroxyanisole [t-butyl-4-methoxyphenol] And T-butylhydroxytoluene [2,6-di-t-butyl-p-cresol] By Flow Injection With Amperometric Detction"
Anal. Chim. Acta 1991 Volume 252, Issue 1-2 Pages 153-159
P. Yáñez-Sedeño, J. M. Pingarrón* and L. M. Polo Díez

Abstract: Two flow injection methods are described for the determination of the antioxidants, t-butyl-4-methoxyphenol (I) and 2,6-di-t-butyl-p-cresol (II) and I in the presence of II. Sample solution containing I was injected into a carrier stream of 0.1 M perchloric acid - 5% methanol and the oxidation signals wer recorded at +0.8 V (in the absence of II) and +0.6 V (in the presence of II). The same procedure was used to determine II, with the oxidation signal being recorded at +1.05 V. The calibration graphs were rectilinear for 0.01 to 0.1, 0.1 to 1 and 1 to 10 mg L-1 of I and 0.02 to 0.1, 0.1 to 1 and 1 to 8 mg L-1 of II. The determination of I in the presence of II is possible as the former is more easily oxidized than the latter. The method was used in the analysis of maize oil and commercial ethyl ether.
Butylated hydroxyanisole Butylated hydroxytoluene Amperometry