There have been studies as well as efforts to improve the protein quantity and quality of the finished food products by augmenting protein-rich cheaper ingredients in food formulations (Nasir and Butt, 2011;Hussain et al., 2007). Although animal proteins are considered to be best quality proteins (Saima et al., 2008), however microbial protein also known as single cell protein grown on agricultural wastes is one of the important optional proteins because of higher protein content and very short growth cycle of microorganisms,thereby, leading to rapid biomass production (Bekatorou et al., 2006) Moreover, microbes are also able to grow on cheap nutrient sources resulting in economical,potentially supplemental protein biomass for balanced nutrition. The UN work for the servey of food consumption of worldwide.It recently reported that over 1 billion people currently do not have access to adequate amounts of food and that number could climb even higher in the near future if current drought conditions persist. Based on UN research, it was estimated a decrease in agricultural production of 20-40% if drought conditions continue and concluded that 2009 could be the beginning of a record-breaking humanitarian crisis throughout much of the world.The demand for protein as food is expanded for malnourished human populations. Consequently,the cost of protein secondary use as food for livestock has also risen. Increasingly there was always a stimulus needed to introduce an additional and or complementary source of animal feed microorganisms that are considered for food or feed use including algae, bacteria, yeasts, molds, and higher fungi. The dried cells of these organisms are collectively referred to as single cell protein. Different types of microorganisms have been recommended for human consumption, including yeast, molds and algae. But as of now only yeast have been used as food to any extent and then under unusual conditions. During Second World War when there were shortages in proteins and vitamins in the diet, the Germans produced yeast and mold Geotrichum candidum in
(1993). The protein content increased as the concentration of wheat straw hydrolysate increased, at the same time the protein content gradually decreased when the fermentation period increased. 5.CONCLUSION The bioconversion effect of pineapple waste into SCP was evaluated using yeast. The increase in biomass contents were observed when there was increase in pineapple waste concentration. The highest biomass content of S. cerevisiae and C. tropicalis was recorded on 7th day fermentation. The highest protein content of S.cerevisiae and C tropicalis was recorded on the 7th day of fermentation at 5 % concentration. The highest reducing sugar content of yeast was recorded on 3rd day of fermentation at 5% concentration. The utilization of reducing sugar was increased with the increase in the concentration of substrates. The present findings reveals that pineapple waste can be used as effective alternate carbon source for SCP production. Also the orang peels have the same effects on all the para meters. 6.REFERENCES Argyro, B., Costas, P., Athanasios, A.K. (2006). Production of Food Grade Yeasts. Food Technol. Biotechnol. 44, 407–415. Nigam, N.M. (2000). Cultivation of Candida langeronii in sugarcane bagasse hemi cellulose hydrolysate for the production of single cell protein. W.J.Microbiol.and biotechnol. 16, 367- 372. Tipparat, H., Kittikun, A.H. (1995). Optimization of single cell protein production from cassava starch using Schwanniomyces castellii. W.J. Microbiol. & Biotechnol. 11, 607-609. Abou Hamed, S.A.A. (1993). Bioconversion of wheat straw by yeast into single cell protein. Egypt. J. Microbiol. 28(1), 1-9.