Effects of culture conditions on ligninolytic enzymes and protease production by Phanerochaete chrysosporium in air.
The production of ligninolytic enzymes and protease by Phanerochaete chrysosporium was investigated under different culture conditions. Different amounts of medium were employed in free and immobilized culture, together with two kinds of medium with different C/N ratios. Little lignin peroxidase (LiP) (< 2 U/L) was detected in free culture with nitrogen-limited medium (C/N ratio: 56/2.2, in mmol/L), while manganese peroxidase (MnP) maximum activity was 231 and 240 U/L in 50 and 100 ml medium culture, respectively. Immobilized culture with 50 ml nitrogen-limited medium gave the highest MnP and LiP production with the maximum values of 410 and 721 U/L separately on the day 5; however, flasks containing 100 ml nitrogen-limited medium only produced less MnP with a peak value of 290 U/L. Comparatively, carbon-limited medium (C/N ratio: 28/44, in mmol/L) was adopted in culture but produced little MnP and LiP. Medium type had the greatest impact on protease production. Large amount of protease was produced due to glucose limitation. Culture type and medium volume influence protease activity corporately by affecting oxygen supply. The results implied shallow immobilized culture was a possible way to gain high production of ligninolytic enzymes.
State Key Joint Laboratory of Environmental Simulation and Pollution Control, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China. xxp02@mails.tsinghua.edu.cn
Xiaoping
X
Xiong
Xianghua
X
Wen
Yanan
Y
Bai
Yi
Y
Qian
D002244:Carbon / Q000378:metabolism; D003470:Culture Media; D009172:Mycology / Q000379:methods; D009584:Nitrogen / Q000378:metabolism; D010447:Peptide Hydrolases / Q000378:metabolism*; D010544:Peroxidases / Q000378:metabolism*; D020075:Phanerochaete / Q000201:enzymology*
D003470:Culture Media; D002244:Carbon; D010544:Peroxidases; C042858:lignin peroxidase; C051129:manganese peroxidase; D010447:Peptide Hydrolases; D009584:Nitrogen