Partial Purification And Characterization Of Polyphenol Oxidase From Wild Pears (Pyrus communis)

Journal Title: International Research Journal of Applied and Basic Sciences - Year 2013, Vol 4, Issue 10

Abstract

precipitation, dialysis and ion exchange chromatography. Of the substrates tested, pyrogallol was the better substrate for PPO with a Km value of 8.7 mM at pH 5 and catechol is better with Km value 4.7 mM at pH 7. The enzyme showed high activity over a broad pH range of 4 – 8 so the optimum pH for PPO activity was found to be 5 and 7. The optimal temperature for enzyme activity was found to be 45°C in presence of pyrogallol but 55°C with catechol as substrate at pH 7. Km value for wild pear PPO is calculated 9.5 and 4.7 mM for catechol and 8.7 and 5.1 mM for pyrogallol at pHs 5 and 7 respectively. As can be seen, affinity of PPOs for various substrates varies widely.The enzyme showed a broad activity over a broad pH and temperature range. The thermal inactivation studies showed that the enzyme is heat resistant. The enzyme showed the highest activity toward pyrogallol and no activity toward tyrosine. Of the inhibitors tested, the most potent inhibitors was sodium kojic acid.

Authors and Affiliations

Shahryar saeidian *| Assistan professor of Biochemistry, Department of Biology, Payame Noor University, Iran, saeedyan@pnu.ac.ir, Afsane khosravi| Steudent of Master Science of Azad University

Keywords

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  • EP ID EP5704
  • DOI -
  • Views 284
  • Downloads 8

How To Cite

Shahryar saeidian *, Afsane khosravi (2013). Partial Purification And Characterization Of Polyphenol Oxidase From Wild Pears (Pyrus communis). International Research Journal of Applied and Basic Sciences, 4(10), 2968-2976. https://europub.co.uk/articles/-A-5704