Spectroscopic and Electrochemical Studies on the Interaction of Carmoisine Food Additive with Native Calf Thymus DNA |
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Authors: | Mitra Arvin Mohammad Ali Hosseinpourfeizi Ali Akbar Moosavi-Movahedi |
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Institution: | 1. Department of Animal Biology , Faculty of Natural Science, University of Tabriz , Tabriz , Iran;2. Institute of Biochemistry and Biophysics, University of Tehran , Tehran , Iran |
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Abstract: | ABSTRACT In this work, for the first time interaction between a carmoisine food additive and native calf thymus DNA was monitored using UV-Vis absorption, fluorescence, and circular dichroism (CD) spectroscopy, as well as cyclic voltammetry and viscosity measurements. It can be concluded that carmoisine could interact with DNA via a groove-binding mode as evidenced by a hyperchromic effect of absorption spectra, increases in the fluorescence quenching effect of DNA, certain induced CD spectral changes, and relatively small changes in the viscosity of DNA. The binding constants (Kb) for the carmoisine with DNA was estimated to be 6.2 × 104 M?1 through spectroscopic titrations. The cyclic voltammetry method showed that both anodic and cathodic peak currents of carmoisine decreased upon addition of the DNA. Circular dichroism spectra indicated that there are certain detectable conformational changes such as conversion from B-like to A-like in the DNA double helix when carmoisine was added. |
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Keywords: | calf thymus DNA carmoisine cyclic voltammetry groove binding spectroscopy |
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