Thermodynamic parameters on the interaction of bovine serum albumin with CdTe quantum dots coated by polyacrylamide grafted onto sodium alginate

In this study, we investigated the interaction between bovine serum albumin (BSA) with CdTe quantum dotscoated by polyacrylamide grafted onto sodium alginate (CdTe-PAAm-g-SA QDs) by fluorescence quenching method.The Stern–Volmer quenching constant (Ksv) at different temperatures, corresponding thermodynamic parameters (ΔH°,ΔG° and ΔS°). We found that for CdTe- Alg-g-PAAm QDs interactions with BSA, the main source of ΔG value wasderived from a large contribution of ΔH term with a little contribution from factor ΔS. So, the main interaction amongCdTe- Alg-g-PAAm QDs –BSA complexes was believed to be van der Waals interactions and hydrogen bonds. Thenegative values of ΔG reveal that the interaction processes are spontaneous

Keywords:

Thermodynamic parameter , QDs , sodium alginate