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Study the interaction of hydrophobic vitamins (vitamin e and vitamin d) with hsa using spectroscopic techniques

Author: 
Abu Teir, M. M., Abu Awwad, I., Darwish S. M. and Abu-Hadid, M. M.
Subject Area: 
Physical Sciences and Engineering
Abstract: 

The interaction of hydrophobic vitamins (vitamin E and vitamin D) with human serum albumin(HSA) at physiological (pH 6.9- 7.4) has been studied using UV-VIS spectrometer, and an FT-IR spectroscopy. The interaction of hydrophobic vitamins (vitamin E and vitamin D) with HSA has been investigated by using UV-absorption, and Fourier transforms infrared (FT-IR) spectroscopy. The binding constants of vitamin E and vitamin D have been determined by UV-absorption. The values of the binding constants are calculated at room temperature: (1.21×102M-1) and (6.8×101M-1) for vitamin E- HSA and vitamin D- HSA mixtures, respectively. FT-IR spectroscopy with Fourier self- deconvolution technique and second derivative resolution enhancement procedures were applied in the analysis of the amide I, amid II, and amid III regions to determine the protein secondary structure and hydrophobic vitamins binding mechanisms. All peaks positions in the three amide regions (amid I, amide II and amide III) have been assigned and any changes due to concentration changes have been investigated. The FTIR spectra measurements indicate a change in the intensity of absorption bands due to change in the concentrations in drugs. In addition a larger intensity decrease in the absorption band of α-helix relative to that of β-sheets has been observed. This variation in intensity is related indirectly to the formation of H-bonding in the complex molecules, which accounts for the different intrinsic propensities of α-helix and β-sheets.

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