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Effects of sodium phosphate buffer on horseradish peroxidase thermal stability

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Abstract

Thermal stability of horseradish peroxidase (HRP) was studied by differential scanning calorimetry, tryptophan fluorescence, the heme absorption and enzymatic activity analysis while the concentrations of sodium phosphate buffer ranged from 2.5 to 50 mM at pH 7.0.

The results showed that the denaturation temperature (T m) values decreased and the intrinsic tryptophan fluorescence intensity of denatured HRP increased as sodium phosphate buffer concentration increased. Furthermore, the heme absorbance at 403 nm and enzymatic activity of HRP decreased with the increasing buffer concentrations. According to data obtained in this experiment, it can be concluded that sodium phosphate accelerated the denaturation process of HRP and reduced the thermal stability of HRP.

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Authors and Affiliations

  1. College of Chemistry and Molecular Science, Wuhan University, Wuhan, Hubei, 430072, P.R. China

    L. Haifeng, L. Yuwen, C. Xiaomin, W. Zhiyong & W. Cunxin

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  1. L. Haifeng
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  2. L. Yuwen
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  3. C. Xiaomin
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  4. W. Zhiyong
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  5. W. Cunxin
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Correspondence to W. Zhiyong.

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Haifeng, L., Yuwen, L., Xiaomin, C. et al. Effects of sodium phosphate buffer on horseradish peroxidase thermal stability. J Therm Anal Calorim 93, 569–574 (2008). https://doi.org/10.1007/s10973-007-8407-y

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  • DOI: https://doi.org/10.1007/s10973-007-8407-y

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