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Browsing Biotechnology by Subject "FT-IR spectroscopy"
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- ItemSpectroscopic investigations of pentobarbital interaction with human serum albumin(Elsevier, 2010-01-29) Darwish, Saqer M.; Abu sharkh, Sawsan E.; Abu Teir, Musa M.; Makharza, Sami A.; Abu-hadid, Mahmoud M.The interaction between pentobarbital and human serum albumin has been investigated. The basic binding interaction was studied by UV-absorption and fluorescence spectroscopy. From spectral analysis pentobarbital showed a strong ability to quench the intrinsic fluorescence of HSA through a static quenching procedure. The binding constant (k) is estimated at 1.812 104 M 1 at 293 K. FT-IR spectroscopy with Fourier self-deconvolution technique was used to determine the protein secondary structure and drug binding mechanisms. The observed spectral changes of HSA–pentobarbital complex indicate a larger intensity decrease in the absorption band of a-helix relative to that of b-sheets. 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 a-helix and b-sheets.
- ItemSpectroscopic study of propofol binding to human serum albumin(World Scientific, 2010-11-10) Darwish, Saqer M.The interaction of propofol and human serum albumin (HSA) has been investigated by UV-absorption, fluorescence spectroscopy and Fourier transform infrared (FT-IR) spectroscopy. Propofol has shown a strong ability to quench the intrinsic fluorescence of HSA through a static quenching procedure. The binding constant (k) is estimated at a low value of 2.55×103 M−1 at 293K. FT-IR spectroscopy with Fourier self-deconvolution technique was used to determine the protein secondary structure in the amide regions I, II and III. The observed spectral changes of HSA-propofol complex indicate a larger intensity decrease in the absorption band of α-helix relative to that of β-sheets. 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.