Total carotenoids produced from R. babjevae JI-1 were calculated using a 1% extinction coefficient (E1%, 1 cm=2,500) and the maximal
absorbance peak value (λmax =450 nm) of β-carotene. The content varied from 6.51±0.3 to 17.44±0.24 µg/g dry cell weight, and the highest productivity was evident in cells cultured for 4 days (Fig. 3).