Production and characterization of biomass and exopolysaccharides obtained in submerged culture under different initial pHs used in the cultivation of Colletotrichum gloeosporioides and Rhizopus stolonifer

Colletotrichum gloeosporioides (GC003) and Rhizopus stolonifer (RS001) were cultivated in two different liquid culture media: LC1 (glucose 40 g L⁻¹, yeast extract 3 g L⁻¹ and tryptone peptone 2 g L⁻¹) and LC2 (glucose 40 g L⁻¹, yeast extract 3 g L⁻¹ and tryptone peptone 10 g L⁻¹) for the production of mycelial biomass and exopolysaccharides (EPS). By using the liquid culture (LC2) under pH of 4.5 presented the highest biomass content (15.73 g L⁻¹) in the propagation of Rhizopus stolonifer. The highest production of exopolysaccharides (1.74 g L⁻¹) was obtained by the liquid culture (LC2) under pH of 4.5 in the cultivation of Colletotrichum gloeosporioides. The results presented that the production of biomass and exopolysaccharides (EPS) is directly related with the pHs values and the strain used in the cultivation.