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J Biochem Mol Toxicol. 2012 Sep;26(9):331-6. doi: 10.1002/jbt.21424. Epub 2012 Jun 21.

Determination on the binding of chlortetracycline to bovine serum albumin using spectroscopic methods.

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  • 1Department of Orthopaedics, First Affiliated Hospital of Jinan University, Guangdong, Guangzhou 510630, People's Republic of China.


In this work, the interaction of chlortetracycline with bovine serum albumin (BSA) was investigated by fluorescence spectroscopy, circular dichroism (CD) spectroscopy, and molecular docking. Results indicated that chlortetracycline quenches BSA fluorescence mainly by a static quenching mechanism. The quenching constants (K(SV) ) were obtained as 5.64 × 10(4) , 4.49 × 10(4) , and 3.44 × 10(4/) M(-1) at 283, 295, and 307 K, respectively. The thermodynamic parameters of enthalpy change Δ H°, entropy change Δ S°, and free energy change Δ G° were -5.12 × 10(4/) J mol(-1), -97.6 J mol(-1) K(-1), and -2.24 × 10(4/) J mol(-1) (295 K), respectively. The association constant (K(A) ) and the number of binding sites (n) were 9.41 × 10(3) M(-1) and 0.86, respectively. The analysis results suggested that the interaction was spontaneous, and van der Waals force and hydrogen-bonding interactions played key roles in the reaction process. In addition, CD spectra proved secondary structure alteration of BSA in the presence of chlortetracycline.

2012 Wiley Periodicals, Inc

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