The screening of culture condition and properties of xylanase by white-rot fungus Pleurotus ostreatus

Xylanase production by a thermo-tolerant Bacillus species under solid-state and submerged fermentation

“…The maximum enzyme activity and biomass however could be obtained after 72 h, suggesting that corn cob supported lesser and slower growth and enzyme synthesis compared to wheat bran. Similar reduction in xylanase activity has been reported on corn cob (9.11 U/ml) compared to wheat bran (28.4 U/ml) in Streptomyces (Nascimento et al, 2002) and fungal (Qinnghe et al, 2004) sp.…”

“…As corn cob is a rich source of both xylan (28%) and xylose (23%), it is potentially an ideal substrate for xylanase production, but reports on utilization of corn cob are limited. This is perhaps due to lower yields observed on corn cob compared to other substrates by some workers (Qinnghe et al, 2004;Nascimento et al, 2002). Hence, further studies on various aspects of corn cob utilization for improved xylanase yields may prove to be beneficial.…”

“…It has been established that solid-state fermentation (SSF) has several advantages over submerged fermentation (SmF), due to smaller volume of solvent required for product recovery, resulting in higher productivity per unit volume, lower contamination and foaming problems and better exploitation of various agro-residues as substrates (Nigam and Singh, 1994;Grajek, 1987;Archana and Satyanarayan, 1997;Kewalrami et al, 1988). Hence, xylanase production using xylan rich agroresidues such as wheat bran, eucalyptus kraft pulp, wheat straw, rice bran, rice straw, sugarcane bagasse and corn cob has been attempted by several workers using fungi (Qinnghe et al, 2004;Bakir et al, 2001;Anthony et al, 2003;Singh et al, 2000), bacteria (Archana and Satyanarayan, 1997;Bataillon et al, 1998;Virupakshi et al, 2005), actinomycetes (Kohli et al, 2001;Beg et al, 2002;Nascimento et al, 2002) and yeasts (Liu et al, 1999). As corn cob is a rich source of both xylan (28%) and xylose (23%), it is potentially an ideal substrate for xylanase production, but reports on utilization of corn cob are limited.…”

Optimization of selective production media for enhanced production of xylanases in submerged fermentation by Thielaviopsis basicola MTCC 1467 using L16 orthogonal array

“…To economize the any metabolite production from microbial systems, selection of appropriate carbon and nitrogen source is pivotal (Sreenivas Rao et al 2008;Suresh et al 2011;Húngaro et al 2011). Fungi are the most potent xylanase producers, as they secrete high level of enzymes than those of yeast and bacteria (Qinnghe et al 2004). Fungus Thielaviopsis basicola which cause black rot in roots of several plants (Baruah et al 1980) is the selective producer of xylanases and cellulases from an industrial point of view due to the extracellular release of xylanases in fermentation broth with an appreciable yield as compared to yeast and bacteria (Haltrich et al 1996;Steiner et al 1987).…”

Thermo-Stable Xylanases from Non Conventional Yeasts

“…It is a heteropolysaccharide consisting of a chain of β-1,4-linked D-xylanopyranose units with substitution by acetyl, xylan requires the action of several enzymes, including endo-1,4-β-D-xylanase (EC3.2.1.8), which is crucial for xylan depolymerization. Xylanases have applications in animal feed digestion, food industries and as bleaching agents in the pulp and paper industries [3]. However, the main application of xylanases is in the pulp and paper industry, where they are used in pre-treatment prior to bleaching [4].…”