Abstract

Protein enrichment of rice straw was attempted by subjecting it to fermentation with a strain of Cellulomonas (CBS.7) which was originally isolated from decomposing cotton debris. Maximum cellulose utilisation (73·2%) was recorded with ammonium sulphate as nitrogen source, supplemented with biotin, at pH 7·5 within 72h of fermentation. Pretreatment of milled rice straw with a 2:1 mixture of NaOH (5%) and H 2O 2 (1%) resulted in lignin reduction from 13·32 to 3·52%. Treated straw yielded 189–195 mg of protein per 100 ml of medium in a period of 120 h of fermentation under shaker-grown condition. Growth in a bench-top fermenter resulted in a protein yield of 1183 mg of protein per litre of medium excluding straw-bound particulate protein. The nutrient profile of bacterial SCP produced is also reported.

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