Abstract
Human serum albumin (HSA) immersed in pyridine-n-hexane mixtures was analyzed using differential scanning calorimetry (DSC). State of the solid HSA in organic solvent mixtures is the non-equilibrium state which is seen as the exothermic peak on the DSC curves. The enthalpy change corresponding to this exothermic peak approaches zero when going from pure pyridine to pure n-hexane. Dependence of the enthalpy change on the pyridine concentration is suggestive that the non-equilibrium state of the immersed HSA results from the HSA-pyridine interactions 'frozen' at the lower temperature. Most likely the temperature-initiated exothermic peak observed on the DSC curves reflects the swelling of HSA by pyridine.
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Borisover, M.D., Zakharychev, D.V. & Solomonov, B.N. Effect of Solvent Composition on DSC Exothermic Peak of Human Serum Albumin Suspended in Pyridine-n-Hexane Mixtures. Journal of Thermal Analysis and Calorimetry 55, 85–92 (1999). https://doi.org/10.1023/A:1010180004973
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DOI: https://doi.org/10.1023/A:1010180004973