Thermostability and thermodynamic characterization of sprouted pearl millet ?-amylases for its biotechnological applications

Authors

  • KU Agbo Department of Biochemistry, University of Nigeria, Nsukka
  • PC Okwuenu Department of Biochemistry, University of Nigeria, Nsukka
  • AL Ezugwu Department of Biochemistry, University of Nigeria, Nsukka
  • SOO Eze Department of Biochemistry, University of Nigeria, Nsukka
  • FC Chilaka Department of Biochemistry, University of Nigeria, Nsukka

DOI:

https://doi.org/10.3329/bjsir.v52i3.34146

Keywords:

Thermostability, Biocatalysts, Thermodynamic, Millet, Inactivation

Abstract

There is an increasing demand for amylolytic products such as glucose syrup in biotechnological industries. Starch liquification by ?-amylase must take place at temperatures higher than the gelatinization temperatures and the use for thermostable ?-amylase is therefore required. Two (or) isotypes namely amy-1 and amy-2 of ?-amylase from pearl millet have been investigated for their thermostability and thermodynamic characterization. Thermal inactivation of ?-amylase follows first order kinetics which varies with time and product during inactivation process. The half-life of ?-1 was 198 mins at 50°C. The Ea (inact) was calculated using Arrhenius plot gave 22.00 KCalmol-1K-1 for ?-1 and 19.44 KCalmol-1K-1 for ?-2. The Z-values were 22.52°C and 25.38°C for ?-1 and ?-2, respectively. The thermodynamic parameters: the enthalpy change of inactivation ?H (inact)  had 87.815 KJmol-1K-1 at 50°C for ?-1 and 78.56 KJmol-1K-1 at 50°C for ?-2. The change in free energy of inactivation ?G (inact) of ?-1 and ?-2 were 105.5 KJmol-1K-1 and 104.33 KJmol-1K-1 at 50°C, respectively. The entropy of inactivation ?S (inact) values for ?-1 and ?-2 are calculated as -54.80 JMol-1K-1 and -79 JMol-1K-1 at 50°C. This suggest that the ?-1 and ?-2 are thermostable.

Bangladesh J. Sci. Ind. Res. 52(3), 159-166, 2017

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Published

2017-10-03

How to Cite

Agbo, K., Okwuenu, P., Ezugwu, A., Eze, S., & Chilaka, F. (2017). Thermostability and thermodynamic characterization of sprouted pearl millet ?-amylases for its biotechnological applications. Bangladesh Journal of Scientific and Industrial Research, 52(3), 159–166. https://doi.org/10.3329/bjsir.v52i3.34146

Issue

Vol. 52 No. 3 (2017)

Section

Articles

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