Exploring the binding mechanisms of inorganic magnetic nanocarrier containing L-Dopa with HSA protein utilizing multi spectroscopic techniques

Abstract

In this study, the interaction of Fe₃O₄@CaAl-LDH@L-Dopa nanoparticles (NPs) with human serum albumin (HSA) was investigated in simulated physiological conditions applying UV-visible, fluorescence, and circular dichroism (CD) spectroscopic techniques. The consequences of UV-vis and CD spectroscopy demonstrated that the interaction of HSA to Fe₃O₄@CaAl-LDH@L-Dopa NPs enforced some conformational alterations within HSA. The fluorescence spectroscopy analysis indicated that by enhancing temperature, the Stern-Volmer quenching constant (K_sv) was decreased, which is relevant to a static quenching mechanism. The binding constant (K_b) was 7.07 × 10⁴ M⁻¹ while the number of the binding site (n) was 0.94 which is in compromise with its binding constant. Also, thermodynamic parameters (ΔH° > 0, ΔG° < 0, and ΔS° > 0) have suggested that hydrophobic forces perform a key role in the interaction of HSA with Fe₃O₄@CaAl-LDH@L-Dopa NPs. Displacement studies successfully carried out using the Warfarin and Ibuprofen have predicted that the binding of Fe₃O₄@CaAl-LDH@L-Dopa NPs to HSA is situated at site II (subdomain IIIA).

Communicated by Ramaswamy H. Sarma

Keywords:

• Multi spectroscopy
• L-Dopa
• binding constant
• HSA

Disclosure statement

The researchers state that they have no conflict of interest.

Funding

The Razi University Research Center's financial support is gratefully acknowledged.