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The production of carotenoids by Rhodotorula glutinis NRRL Y-842, R. armeniaca NRRL Y-17201, R. mucilaginosa NRRL Y-844, R. bogoriensis NRRL Y5980 or R. aurantiaca NRRL Y-1584 on glucose as a carbon source were investigated at different incubation periods at 30oC in shaking incubator. Among the different yeast strains, R.glutinis NRRL Y-842 proved to be the most active producer during the fermentation period, the maximum values of carotenoids produced by Rhodotorula strains were 2328.29μg/L at 96hr., 10.99 μg/L at 96hr., 10.99 μg/L at 96hr., 71.13 μg/L at 120hr. and 62.73 μg/L at 96hr., respectively. Using sucrose, lactose, maltose or fructose as a carbon source, R. glutinis NRRL Y-842 produced 732.45μg/L at 72hr., 488.88μg/L at 72hr., 1704.97μg/L at 96hr. and 2166.01μg/L at 96hr., respectively. When agroindustrial by-products, namely, untreated sugarcane molasses, untreated beet molasses, treated sugarcane molasses, treated beet molasses, untreated vinasse, treated vinasse, glucose syrup, soy bean flour extract (SFE) and maize flour extract (MFE) were also used as a carbon source, the maximum values of carotenoids produced by R. glutinis NRRL Y-842 were 1772.19 μg/L at 120 hr., 1571.40μg/L at 144 hr., 1002.01μg/L at 120 hr., 679.00μg/L at 96 hr., 916.65μg/L at 120 hr., 452.89μg/L at 120 hr., 1831.36μg/L at 96 hr., 426.80μg/L at 48 hr. and 340.79μg/L at 48 hr., respectively.

EFFECT OF SOME SUGARS AND AGRO-INDUSTRIAL BY-PRODUCTS ON CAROTENOIDS PRODUCTION BY SOME YEAST STRAINS OF RHODOTORULA SPP.