Fig. 2

Box‒Behnken experimental runs for carotenoid production by M. luteus on whey media. a Micrococcus luteus culture; b Whey medium before and after carotenoid production; c different runs pointing to run 15 with red arrows; d extraction of carotenoids using ethanol; e carotenoid pigments during lyophilization; f and g carotenoid pigments after grinding