Characterization of Cross-Linked Enzyme Aggregates (CLEAs) of Tyrosinase from Volvariella volvacea

Authors

  • Chaiyapat Chatwarunwong Department of Biotechnology, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom, 73000
  • Sinthuwat Ritthitham Department of Biotechnology, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom, 73000

Abstract

Mushroom is considered as a cheap source of tyrosinase for L-3,4-dihydroxyphenylalanine (L-DOPA) production. Tyrosinase extracted from fresh straw mushroom (Volvariella volvacea) was concentrated by ammonium sulfate precipitation and immobilized as cross-linked enzyme aggregates (CLEAs) with the optimal glutaraldehyde concentration of 1.5% (v/v) at 4 oC for 16 h. The optimum pH and temperature on CLEAs-tyrosinase activity was found at 7.0 and 40 oC, respectively while the free tyrosinase exhibited pH and temperature optima at 6.0 and 30 oC, respectively. The apparent Km and Vmax values of CLEAs-tyrosinase for L-tyrosine were 0.261±0.057 mM and 0.053±0.0081 mM min-1, respectively. The CLEAs tyrosinase retained 50% activity after three reuses with 4 h of each reaction cycle. The CLEAs tyrosinase with the specific activity of 12.3 units/g could produce 0.0025 mM L-DOPA in 2 h under the optimized conditions. Keywords: enzyme immobilization, cross linked enzyme aggregates, tyrosinase, Volvariella volvacea

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2019-09-25

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บทความวิจัยจากการประชุมวิชาการระดับชาติ"วิทยาศาสตร์วิจัย"ครั้งที่ 11