Abstract
AbstractThe growth of a red‐pigmented yeast, isolated from yogurt and identified as Rhodotorula rubra, was studied on various industrial and agricultural by‐products. Peat hydrolysate when supplemented with peptone and yeast extract supported a satisfactory growth of the yeast. Ammonium hydroxide and ammonium sulfate were the best inorganic nitrogen sources. A yield of 11.8 g/1 was obtained on molasses and wort used in a concentration of 10 and 40% (v/v), respectively. Molasses were pre‐treated to be effective. The best yield of 14 g/1, however, was obtained on a richer medium composed of molasses, peptone and yeast extract. The pH profiles were also studied and growth was found within a broad pH zone of 3–10.
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