Study of laccase production by Pleurotus ostreatus in a 5 l bioreactor and application of the enzyme to determine the antioxidant concentration of human plasma.
OBJECTIVE
To achieve high laccase production from Pleurotus ostreatus in a bench top bioreactor and to utilize the enzyme for determination of the total antioxidant concentration (TAC) of human plasma.


RESULTS
Laccase production by P. ostreatus studied in a benchtop bioreactor was as high as, 8740 U ml(-1) in presence of copper sulfate. The enzyme was used to replace metmyoglobin and hydrogen peroxide for the estimation of TAC in human plasma. The trolox equivalent antioxidant concentrations determined by the laccase-based method and metmyoglobin method ranged from 1.63 +/- 0.011 to 1.80 +/- 0.006 mmol l(-1) and from 1.41 +/- 0.004 to 1.51 +/- 0.008 mmol l(-1) plasma, respectively.


CONCLUSIONS
Pleurotus ostreatus produced high amount of extracellular laccase in a benchtop bioreactor. The enzyme can be used to assay TAC of blood plasma without the interference encountered with the hydrogen peroxide and metmyoglobin mediated assay method.


CONCLUSIONS
Laccase production by P. ostreatus obtained in this study was the highest among all reported laccase producing white-rot fungi. Moreover, an accurate laccase-based assay method was developed for detection of TAC in human plasma.
Mazumder
S
S
Indian Institute of Chemical Biology, Kolkata, India.
Bose
S
S
Bandopadhyay
A
A
Alam
S
S
Mukherjee
M
M
D000328:Adult; D000975:Antioxidants / Q000032:analysis*; D019149:Bioreactors / Q000382:microbiology; D001774:Blood Chemical Analysis / Q000379:methods*; D006801:Humans; D042845:Laccase / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism; D010949:Plasma / Q000737:chemistry*; D020076:Pleurotus / Q000201:enzymology* / Q000254:growth & development*; D013997:Time Factors
D000975:Antioxidants; D042845:Laccase; D010100:Oxygen