Fig. 4
Preparation of gardenia blue pigments by using recombinant β-glucosidase. a Photographs of gardenia pigments synthesized by reaction of genipin and 6 types of amino acids (Val, Ala, Phe, Met, Lys, and Arg). b Effect of Lys content on gardenia blue pigment production. c Effect of citric acid content on gardenia blue pigment production. d Effect of temperature and time on gardenia blue production. Bars represent mean ± SD (n = 3)