Interaction of triprolidine hydrochloride with serum albumins: Thermodynamic and binding characteristics, and influence of site probes

B. Sandhya, Ashwini H. Hegde, Shankara S. Kalanur, Umesha Katrahalli, J. Seetharamappa

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The interaction between triprolidine hydrochloride (TRP) to serum albumins viz. bovine serum albumin (BSA) and human serum albumin (HSA) has been studied by spectroscopic methods. The experimental results revealed the static quenching mechanism in the interaction of TRP with protein. The number of binding sites close to unity for both TRP-BSA and TRP-HSA indicated the presence of single class of binding site for the drug in protein. The binding constant values of TRP-BSA and TRP-HSA were observed to be 4.75±0.018×103 and 2.42±0.024×104M-1 at 294K, respectively. Thermodynamic parameters indicated that the hydrogen bond and van der Waals forces played the major role in the binding of TRP to proteins. The distance of separation between the serum albumin and TRP was obtained from the Förster's theory of non-radioactive energy transfer. The metal ions viz., K+, Ca2+, Co2+, Cu2+, Ni2+, Mn2+ and Zn2+ were found to influence the binding of the drug to protein. Displacement experiments indicated the binding of TRP to Sudlow's site I on both BSA and HSA. The CD, 3D fluorescence spectra and FT-IR spectral results revealed the changes in the secondary structure of protein upon interaction with TRP.

Original languageEnglish
Pages (from-to)1180-1186
Number of pages7
JournalJournal of Pharmaceutical and Biomedical Analysis
Issue number5
Publication statusPublished - 05-04-2011


All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Pharmaceutical Science
  • Drug Discovery
  • Spectroscopy
  • Clinical Biochemistry

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