Voltammetric Determination of Sunscreen by Convenient Epoxy-Carbon Composite Electrodes
MIAW-LING CHANG1* AND CHUR-MIN CHANG2
1.Department of Cosmetic Science,
2.Department of Applied Chemistry, Chia-Nan College of Pharmacy and Science, 60, Sec.1, Erh-Jent Road, Jen-Te Hsian,Tainan County,Taiwan 71710, R.O.C.
(Received: May 15, 2001; Accepted: September 12, 2001)
ABSTRACT
An electrode composed of an epoxy resin and graphite powder is fast and convenient to fabricate. The performance as a working electrode for cyclic voltammetry measurement of hexacyanoferrate(III) in aqueous and nonaqueous systems is compared with a paraffin carbon paste electrode. Well defined current-potential curves, and well linearity of current-root scan rate and current-concentration system are reported. The electroanalytical studies of the octyl methoxycinnamate, oxybenzone , benzophenone, octyl salicylate, and butyl methoxy dizenzoyl methane, that are often used as sunscreens in commercial cosmetic products, were described at the carbon-epoxy composite electrodes in nonaqueous solvent.
Key words: carbon-epoxy, composite electrode, nonaqueous solution, sunscreens, cyclic voltammetry(CV), differential pulse voltammetry (DPV)