CURCUMIN: A VOLTAMMETRIC DETECTION IN AQUEOUS SOLUTION AND ITS TRANSFORMATION AS A MODIFIER OF WORKING ELECTRODE
Dian Ayu Setyorini, Indra Noviandri, Muhammad Bachri Amran

Institut Teknologi Bandung

Abstract

Curcumin is a natural compound from Curcuma longa that is attractive to be explored. Curcumin has become a popular object regarding the claims to be anti-cancer, anti-inflammatory, anti-bacteria, etc. Many studies have been conducted to investigate its properties. Curcumin has high solubility in ethanol and base solution. Hence, this study investigated the solubility and stability of curcumin in water-based solution by using UV-Vis spectrophotometry. Meanwhile, the electrochemical behavior was investigated by using the voltammetric method. Curcumin is not only attractive as an analyte but also as a modifier of electrode. It can be transformed to AgNPs(curcumin) to enhance electrochemical performance. The synthesis was conducted under sunlight radiation. The results showed that the solubility of curcumin in ethanol decreased linearly following the addition of water. But, the presence of NaOH could increase the solubility of curcumin and maintain its stability. The cyclic voltammetry presented the oxidation of curcumin in an aqueous solution occurred at pH 8.0 by using Au as the working electrode, Pt as the counter electrode, and Ag/AgCl (3 M) as the reference electrode. Curcumin also could be transformed to AgNPs(curcumin) and increase the anodic and cathodic peak of K3[Fe(CN)6] and K4[Fe(CN)6], indicating its potential as the modifier of the working electrode.

Keywords: curcumin, aqueous solution, modified carbon paste electrode, AgNPs, electrochemical detection.

Topic: Analytical Chemistry