Fig. 4
Temperature-shift strategy fermentation on the production of extracellular four water-soluble yellow pigments. a Time course of the four new water-soluble yellow pigments fermentation under B strategy. b Yields of the four water-soluble yellow pigments under different fermentation strategies. Fermentation strategies: 30 and 35 °C respectively represented fermentation at 30 and 35 °C for 8 days; A 30 °C for 6 days and then turn into 35 °C for 2 days; B 30 °C for 4 days and then turn into 35 °C for 4 days; C 35 °C for 4 days and then turn into 30 °C for 4 days; D 35 °C for 6 days and then turn into 35 °C for 2 days