Formation of the ligninolytic enzymes by Phanerochaete chrysosporium under various ammonium nitrogen concentrations
黄孢原毛平革菌在多种氨氮浓度下木质素降解酶的产生

Agitated submerged culture of Phanerochaete chrysosporium was carried out in air at ammonium nitrogen concentrations ranging from 0.0308 to 0.924g/L. Lignin peroxidase was detected within a range of nitrogen concentration from 0.0308 to 0.308g/L with the highest peak activity of 42.8U/L, and laccase between 0.0308g/L and 0.154g/L with the highest activity of 35.0U/L. At nitrogen concentrations of 0.154g/L and above, glucose consumption rates were comparable and evidently higher than that at 0.0308g/L, and ammonium nitrogen reached minimums when glucose was depleted and thereafter began to increase. Activity peaks of lignin peroxidase and laccase coincided with the maximum or nearly maximum consumption of glucose and nitrogen at nitrogen concentrations of 0.154g/L and above. The results would be of importance in the fermentation of the ligninolytic enzymes and the direct application of white rot fungi in environmental engineering.