NDLI: Spectrophotometric Study of Complex Formation Between Curcumin and Cr(III) Ion: A Case of Heavily Overlapping Absorption Peaks

Content Provider	Springer Nature Link
Author	Phongarthit, Kanitta Wongnawa, Malinee Chooto, Pipat Wongnawa, Sumpun
Copyright Year	2016
Abstract	The complex formation between curcumin and Cr(III) in dimethyl sulfoxide (DMSO) was studied by the spectrophotometric method using the overlapping correction technique and compared with the result from the voltammetric technique. All samples were prepared in DMSO, protected from light, and all measurements were made at 25.0 ± 0.1 °C. The stoichiometry of the Cr(III)–curcumin complex was obtained from the mole ratio and continuous variation methods. Due to extensive overlap between absorption of the new complex and unreacted curcumin, the true absorption of the complex could not be obtained directly and further analysis was not possible. To avoid the high expense of purchasing commercial software, a new spreadsheet method using a common software readily available in most desktop PCs or notebooks was used to calculate the residual amount of unreacted curcumin, which was then subtracted numerically from the overlapping absorption to obtain the absorbance of the anticipated complex. Subsequently, the stoichiometry of the Cr(III)–curcumin complex was determined as 1:1 from both methods, hence the complex formation constant (K) of this compound could be calculated. The value of K obtained from the equilibrium concentrations and the Benesi–Hildebrand plot are (3.20 ± 0.05) × 10$^{4}$ and (3.00 ± 0.05) × 10$^{4}$, respectively, and closely agree with the value of (3.50 ± 0.05) × 10$^{4}$ from Nernst’s equation.
Starting Page	1468
Ending Page	1478
Page Count	11
File Format	PDF
ISSN	00959782
Journal	Journal of Solution Chemistry
Volume Number	45
Issue Number	10
e-ISSN	15728927
Language	English
Publisher	Springer US
Publisher Date	2016-09-06
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Curcumin Metal–curcumin complex Mole ratio method Continuous variation method Job’s method Peaks deconvolution Complex formation constant Physical Chemistry Industrial Chemistry/Chemical Engineering Geochemistry Oceanography Inorganic Chemistry Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Biochemistry Molecular Biology Biophysics Physical and Theoretical Chemistry

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