Abstract

Protein-enriched products were manufactured from yam and pineapple peels using solid state fermentation with Saccharomyces cervisiae and Trichoderma viride with a view to converting waste to wealth. The organisms were grown in the two substrates with addition of ammonium sulphate (10gN/kg substrate) as nitrogen source and fermentation was made at tropical room temperature (27±2 oC) for 96 h. The proximate chemical compositions of the products were determined using standard methods. Blood samples from wistar rats fed the products were analysed for biochemical changes. S. cerevisiae fermented yam and pineapple significantly increased the protein content of yam and pineapple peels from 6.60-16.82% and 4.50-21.04% respectively, while T. viride increased protein in the two substrates from 6.60-14.65% and 4.50-15.95% respectively. Rats fed protein-enriched products from yam and pineapple peels fermented with S. cerevisiae and T. viride had similar levels of serum alanine aminotransferase and aspartate aminotransferase activities in their blood as those fed casein diets suggesting no adverse effects. The data on the kidney and liver function tests suggest that none of the formulated experimental feeds is unsafe to both kidney and liver health of the wistar rats and can be recommended as desirable for animal feed.

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