Hyperproductivity of extracellular enzymes from indigenous white rot fungi (P. chrysosporium IBL-03) by utilizing agro-wastes

Abstract

An indigenous locally isolated white rot fungal strain Phanerochaete chrysosporium IBL-03was investigated for the hyper-production of ligninolytic enzymes from different agro-industrial wastes including wheat straw, rice straw, banana stalks, corncobs, corn stover, and sugarcane bagasse as substrate material in still culture fermentation technique. Screening experiments were performed at 30oC from 1 to 10 days and maximum enzyme activities were recorded after the 5th day of incubation on banana stalk. P. chrysosporium IBL-03 produced highestactivities of lignin peroxidase (LiP) and manganese peroxidase (MnP) but no laccase activity was detected in any fermented culture media. Production of ligninolytic enzymes was substantially enhanced through the optimization process. When banana stalk at 66.6 % moisture level and pH 4.5 was inoculated with 5mL spore suspension of P. chrysosporium IBL-03 at 35oC in the presence of molasses (1%) as carbon source, ammonium sulfate (0.2%) as nitrogen supplement, (1%) Tween-80 (0.3 mL) as surfactant and mediators (MnSO4 and veratryl alcohol) enhanced the LiP and MnP production up to 1040 and 965 (U/mL), respectively.