Growth parameters for the yeast Rhodotorula rubra grown in peat extracts

摘要: Abstract A newly-isolated strain of Rhodotorula rubra, which has been reported to have the ability synthesize high concentrations carotenoids, adapted and grown in liquid phase using acid extracts peat as main substrate source. The growth yeast was studied a function medium carbohydrate concentration, pH, time, temperature, agitation rate. optimal conditions were found be an initial total concentration 15 g·l−1, pH 5.5, incubation time 3.5 d, temperature 22°C, rate 200 rpm. Under those conditions, parameters were: approximately 4.8 g· l−1 dry biomass, 70% yield 32% efficiency. Also, β-carotene 1,256 μg·g−1 biomass produced by yeast.