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. 1980 Feb;39(2):382–386. doi: 10.1128/aem.39.2.382-386.1980

Use of a Cellulase-Derepressed Mutant of Cellulomonas in the Production of a Single-Cell Protein Product from Cellulose †

E V Hitchner 1,‡, J M Leatherwood 1
PMCID: PMC291341  PMID: 16345511

Abstract

A cellulase-derepressed mutant of a Cellulomonas species was used to produce single-cell protein from crystalline cellulose. In preliminary tests, maximum yield of single-cell protein was obtained at 30°C (pH 7.0) with urea as the nitrogen source. A continuous-flow foam flotation procedure was developed for rapid and efficient separation of bacteria from the culture liquid and cellulose residue. A pH of 4.5 was optimum for foam flotation of this organism. In preliminary trials, recovery was 85% of the cells with the flotation procedure. Cellulomonas was 68% true protein and had an essential amino acid profile featuring a high lysine content (6.5% of protein). The Cellulomonas product was evaluated nutritionally with weanling rats. The net protein utilization value for the protein supplemented with methionine was 50.4% Weight gain of rats on the Cellulomonas diet was similar to that of rats fed a casein diet.

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Selected References

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