Fig. 7
Effect of cell concentration on the conversion rate of D-tagatose (a). Reaction conditions: 18 g L-1 D-galactose, 50 mM Tris-HCl, 60 °C, 15 h. Effect of temperature on the conversion rate of D-tagatose (b). Reaction conditions: 18 g L-1 D-galactose, 50 mM Tris-HCl, 4.8 g L-1 E. coli cells, 15 h. Effect of D-galactose concentration on the conversion rate of D-tagatose (c). Symbols: (■) the D-tagatose concentration; (○) the conversion rate of D-tagatose. Reaction conditions: 4.8 g L-1 E. coli cells, 50 mM Tris-HCl, 60 °C, 15 h. Time course of D-tagatose conversion (d). Symbols: (■) 150 g L-1 initial D-galactose; (△) 250 g L-1 initial D-galactose. Reaction conditions: 150 g L-1 and 250 g L-1 D-galactose, 4.8 g L-1 E. coli cells, 50 mM Tris-HCl, 60 °C, 48 h