Fig. 4From: High-level de novo biosynthesis of glycosylated zeaxanthin and astaxanthin in Escherichia coliThe effects of carbon sources on the production of zeaxanthin glucosides. A Carotenoid contents and OD600 of strain X1 by comparison of different carbon sources: 10 g/L glucose, 10 g/L glycerol and their mixture, 5 g/L glucose + 5 g/L glycerol (glc + gly). B Carotenoid contents and OD600 of strains X1 and “ + crtY” by optimizing the concentrations of glucose and introduction of additional copies of crtY. Error bars, mean ± s.d., n = 2Back to article page