Association Equilibrium of Methylene Blue by Spectral Titration and Chemometrics Analysis: A Thermodynamic Study

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pp. 459-468 ◽  
Author(s):  
Jahan B. Ghasemi ◽  
M. Miladi
2020 ◽  
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Farid Mzee Mpatani ◽  
Aaron Albert Aryee ◽  
Alexander Nti Kani ◽  
Kang Wen ◽  
Evans Dovi ◽  
...  

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Sumanta Sahu ◽  
Souman Pahi ◽  
Sujata Tripathy ◽  
Satish Kumar Singh ◽  
Abhijit Behera ◽  
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João Paulo C. Trigueiro ◽  
Merly R. Santos ◽  
Ângelo M. L. Denadai ◽  
Luiz Carlos A. Oliveira ◽  
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2009 ◽  
Vol 11 (4) ◽  
pp. 24-29
Author(s):  
G. Behbehania ◽  
A. Divsalar ◽  
A. Saboury

A Novel method for Thermodynamic Study on the Binding of Milk Carrier protein of BLG-A with Cr+3 Thermodynamics of the interaction between Cr3+ with β-lactoglobulin type A (BLG-A) was investigated at pH 7.0 and 37°C by isothermal titration calorimetry. A new method to follow the effect of Cr3+ on the stability of BLG-A was introduced. The new solvation model was used to reproduce the enthalpies of BLG-A+ Cr3+ interactions over the whole range of Cr3+ concentrations. The solvation parameters recovered from the new equation are attributed to the structural change of BLG-A and its biological activity. The results obtained indicate that there is a set of two identical binding sites for Cr3+ ions with positive cooperativity. The association equilibrium constants are 14.39 and 0.49 mM-1 for the first and second binding site, respectively. The enthalpy of binding for one mole of Cr+3 ion to one mole of the binding site on BLG-A (ΔH=104.60 kJ mol-1) is obtained.


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