Polyluminol/Single-Walled Carbon Nanotube Composite Film-Modified Electrodes for Simultaneous Determination of Propyl Gallate and Ascorbic Acid
Polyluminol/single-walled carbon nanotube (SWCNT) composite film-modified glassy carbon (GC) electrodes were successfully used for simultaneous determination of propyl gallate (PG) and ascorbic acid (Vc). The polyluminol/SWCNT composite films were characterized by scanning electron microscopy and cyclic voltammetry. The composite film-modified electrodes exhibited catalytic activity in the oxidation reaction of the antioxidants. Several operational parameters such as pH of electrolyte solution, the concentration of luminol (monomer) and the amount of SWCNT were optimized. The film-modified electrodes exhibited high sensitivity, low detection limit, and reasonable stability in the simultaneous determination of propyl gallate and ascorbic acid. The peak current linearly depended on the concentration of propyl gallate and ascorbic acid in the range of 4.0 × 10−7–4.0 × 10−5 mol/L with the lower detection limit of 4.0 × 10−8 mol/L and 8.0 × 10−8 mol/L, respectively. The proposed method can be applied to the simultaneous determination of propyl gallate and ascorbic acid in beverages.
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Document Type: Research Article
Publication date: August 1, 2010
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