The invention relates to an isolated strain of Sporobolomyces roseus with high carotenoid production capacity. There are also disclosed processes for obtaining colored compositions comprising carotenoids and in particular β-carotene. The invention also discloses the use of these compositions as antioxidant agents and as colored ingredients in edible products. It also relates to processes for reutilizing food industry waste materials or byproducts, such as citrus fruit molasses with Sporobolomyces roseus strains.