Single-Cell Proteins

Abstract

Both photosynthetic and nonphotosynthetic microorganisms, grown on various carbon and energy sources, are used in fermentation processes for the production of single-cell proteins. Commercial-scale production has been limited to two algal processes, one bacterial process, and several yeast and fungal processes. High capital and operating costs and the need for extensive nutritional and toxicological assessments have limited the development and commercialization of new processes. Any increase in commercial-scale production appears to be limited to those regions of the world where low-cost carbon and energy sources are available and conventional animal feedstuff proteins, such as soybean meal or fish meal, are in short supply.

Production of Sophorolipid Biosurfactant byPichia anomala

“…1). Biosurfactant activity was recognized by the occurrence of halo zones surrounding the colonies on YM medium after cultivation at [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] C, slightly at 40 C, but was absent at 45 C. In some reports, thermophilic yeasts are defined as yeasts with a minimal temperature for growth of 20 C but with no maximal temperature limit. By this definition, we concluded that the yeast PY1 strain that grows well at 20 C, and that up to high temperatures, such as 37 C, it is thermotolerant.…”

Chemical composition of Rhodocyclus gelatinosus biomass produced in poultry slaughterhouse wastewater

“…This activity represents a promising application of biotechnology, which is even more successful when associated to the utilization of sewage or industrial wastes as substrate (Litchfield, 1983). Anoxygenic phototrophic bacteria, especially Purple NonSulfur Bacteria (PNBS) are widely distributed in nature (soil, water and wastes) and have special importance because of their potential role in the degradation of industrial pollutants (Sasikala et al, 1995).…”

Algerian Yeast Strains: Isolation, Identification and Production of Single Cell Protein from Whey with Strain Candida kefyr

“…The cell dry weight was determined asprevious work [14], [15]. Aliquot of the culture media was centrifuged at 5000 rpm for 15 min, after washing the biomass with Ringer serum; it was precipitated for a second time before measuring dry weight, followed by drying of the cells at 105±1º C for 2-3h.…”