The production of Single Cell Protein in the batch culture from crude rapeseed oil and waste fatty acids using Y. lipolytica strains was studied. The effect of nitrogen sources, lipid concentration and pH value on the yeast growth and biomass yield was also investigated. Yarrowia lipolytica ATCC 8661 was the best strain for SCP production on both lipid substrates. The specific growth rate and biomass yield were m = 0,19 - 0,35 h-1 and Yx/s = 0,68 - 1,07 respectively, depending on the culture condition. With the above yeast strain it was possible to carry out the fermentation at low pH 3,5 without any significant lowering of kinetic and yield parameters.
The genus Arthrospira includes filamentous cyanobacteria with multicellular cylindrical trichomes arranged in an open helix. The biomass of Arthrospira is composed of protein (50-70%), carbohydrates, lipids and minerals. It also contains carotenoids, phycocyanin and vitamins. Arthrospira species are found in tropical and semitropical regions. Arthrospira is industrially cultivated because of its high nutritional values as well as of its therapeutic properties. Commercial production of Arthrospira is carried out in open ponds and closed bioreactors. The biomass is sold by the incorrect name ?Spirulina' as a result of confusion in nomenclature regarding the genus Arthrospira.
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