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Multiwalled Carbon Nanotube Modified Electrodes for the Adsorptive Stripping Voltammetric Determination and Quantification of Curcumin in Turmeric
Author(s) -
Chaisiwamongkhol Korbua,
Ngamchuea Kamonwad,
BatchelorMcAuley Christopher,
Compton Richard G.
Publication year - 2017
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201600670
Subject(s) - curcumin , detection limit , electrode , pyrolytic carbon , adsorptive stripping voltammetry , adsorption , materials science , linear sweep voltammetry , voltammetry , stripping (fiber) , carbon nanotube , linear range , cyclic voltammetry , electrochemistry , analytical chemistry (journal) , chemistry , chromatography , nanotechnology , organic chemistry , pyrolysis , composite material , biochemistry
Abstract A sensitive electrochemical method for the determination and quantification of curcumin using adsorptive stripping voltammetry (AdsSV) at a multiwalled carbon nanotube modified basal plane pyrolytic graphite electrode (MWCNT‐BPPG electrode) is presented exploiting the high surface area of the latter. Next the voltammetric behaviour of curcumin on the modified electrode is examined and AdsSV shown to be a sensitive method for quantifying curcumin. The adsorption of curcumin on the electrode surface is evidenced to follow a Langmuir adsorption isotherm. Linear calibration for curcumin in the range of 2–100 μM was obtained with a detection limit of 0.45 μM and a limit of quantification of 1.49 μM. For application to real samples of turmeric, a one‐step sample preparation in ethanol has developed providing a simple and rapid extraction procedure. The MWCNT‐BPPG electrode with AdsSV allowed the determination of curcumin equivalent in turmeric powder sample with recoveries in the range of 92–108 %. This facile and fast method will be useful for monitoring the quality of curcumin containing in commercial turmeric products.