Production of single cell protein from rice polishings using Candida utilis |
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Authors: | Ibrahim Rajoka M Tariq Kiani MA Khan Sohail Awan MS Hashmi Abu-Saeed |
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Institution: | (1) National Institute for Biotechnology and Genetic Engineering, P.O. Box 577, Faisalabad, Pakistan;(2) Department of Animal Nutrition, University of Agriculture, Faisalabad, Pakistan;(3) Department of Food Technology, University of Agriculture, Faisalabad, Pakistan |
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Abstract: | Microbial protein was produced from defatted rice polishings using Candida utilis in shake-flasks and a 14-l fermentor to optimize fermentation conditions before producing biomass in a 50-l fermentor. The
organism supported maximum values of 0.224 h−1, 0.94, 1.35, 1.75, 2.12 g l−1 h−1, 0.62 g cells g−1 substrate utilized and 0.38 g g−1 for specific growth rate, true protein productivity, crude protein productivity, cell mass productivity, substrate consumption
rate, cell yield, crude protein yield, respectively in 50-l fermentor studies using optimized cultural conditions. Maximum
values compared favourably or were superior to published data in literature. The biomass protein in the 50-l fermentor contained
22.3, 27.8, 19.2, 9.5, 38.12, 8.5 and 0.27% true protein, crude protein, crude fibre, ash, carbon, cellulose and RNA content,
respectively. The dried biomass showed a gross metabolizable energy value of 2678 kcal kg−1 and contained all essential and non-essential amino acids. Yeast biomass as animal feed may replace expensive feed ingredients
currently being used in poultry feed and may improve the economics of feed produced in countries like Pakistan.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | Amino acids Candida utilis rice single cell protein yeast |
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