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Journal of Biological Sciences
Year: 2008  |  Volume: 8  |  Issue: 5  |  Page No.: 866 - 873

Characterisation of Laccase from Pycnoporus sanguineus KUM 60953 and KUM 60954

Umaiyal Munusamy, Vikineswary Sabaratnam, Sekaran Muniandy, Noorlidah Abdullah, Ashok Pandey and E.B.G. Jones    

Abstract: Four strains of Pycnoporus sanguineus isolated from Shah Alam (KUM 60954), Endau Rompin (KUM 60955), Cherating (KUM 60956), Gombak (KUM 60957) and the standard strain from Thailand (KUM 60953) were evaluated for their ability to grow on Polycyclic Aromatic Hydrocarbon (PAH)- and acetonitrile-incorporated Potato Dextrose Agar (PDA). The mycelial growth was then compared to the growth of P. sanguineus on PAH and acetonitrile free PDA. All strains tested showed a high tolerance to PAH up to 25 ppm and 2.5% of acetonitrile. Laccase derived from the best strains KUM 60954 and KUM 60953 which exhibited higher tolerance to both PAH and acetonitrile was further characterised. The activity was maximum for both strains at pH 5.0 and 40 °C. Laccase from both strains was stable over a wide range of pH (3-5) and at temperatures below 60 °C. Laccase was stored as a concentrate or as a lyophilised powder to minimise the degradation of enzyme activity during storage. The laccase activity in the extract remained a high activity up to four months at optimum pH 5.0 and at both 0 and 4 °C. Further laccase was also stable up to 24 h at 40 °C when mixed with 1% of acetonitrile.

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