title: Production of cellulases from Aspergillus niger NS-2 in solid state fermentation on agricultural and kitchen waste residues.
abstract: Various agricultural and kitchen waste residues were assessed for their ability to support the production of a complete cellulase system by Aspergillus niger NS-2 in solid state fermentation. Untreated as well as acid and base-pretreated substrates including corn cobs, carrot peelings, composite, grass, leaves, orange peelings, pineapple peelings, potato peelings, rice husk, sugarcane bagasse, saw dust, wheat bran, wheat straw, simply moistened with water, were found to be well suited for the organism's growth, producing good amounts of cellulases after 96 h without the supplementation of additional nutritional sources. Yields of cellulases were higher in alkali treated substrates as compared to acid treated and untreated substrates except in wheat bran. Of all the substrates tested, wheat bran appeared to be the best suited substrate producing appreciable yields of CMCase, FPase and β-glucosidase at the levels of 310, 17 and 33 U/g dry substrate respectively. An evaluation of various environmental parameters demonstrated that appreciable levels of cellulases could be produced over a wide range of temperatures (20-50 °C) and pH levels (3.0-8.0) with a 1:1.5 to 1:1.75 substrate to moisture ratio.
authors.affiliation: Department of Microbiology, Panjab University, Chandigarh 160014, India.
authors.forename: Namita
authors.initials: N
authors.lastname: Bansal
authors.forename: Rupinder
authors.initials: R
authors.lastname: Tewari
authors.forename: Raman
authors.initials: R
authors.lastname: Soni
authors.forename: Sanjeev Kumar
authors.initials: SK
authors.lastname: Soni
mesh_terms: D000383:Agriculture; D001234:Aspergillus niger / Q000378:metabolism*; D044602:Cellulases / Q000096:biosynthesis*; D002482:Cellulose; D004043:Dietary Fiber; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D007218:Industrial Microbiology / Q000379:methods; D031786:Saccharum / Q000378:metabolism; D013696:Temperature; D014908:Triticum / Q000378:metabolism; D018505:Waste Management / Q000379:methods*; D014867:Water / Q000032:analysis; D003313:Zea mays / Q000378:metabolism
chemical_list: D004043:Dietary Fiber; D014867:Water; D002482:Cellulose; C027433:bagasse; D044602:Cellulases