Research on sugarcane juice fermentation by Ganoderma lucidum and assay of antioxidant activity of exopolysaccharide

摘要

A protocol for processing of the Ganoderma lucidum fermentation was carried outusing sugarcane juice at 28℃ for 14 d. The nonlinearity logistic growth curve modelof G. lucidum is successfully fitted and the ideal highest biomass is estimated to be5.42 g/L. G. lucidum was found to have a significant decrease effect on the pH valueand sugar in sugarcane juice. The lowest pH (3.87 ± 0.01) was found on the 3rd dayduring fermentation. To the contrary, the release of exopolysaccharides and proteincontent noticeable increased, and free amino acids greatly enriched after the fermentation.Antioxidant activity tests showed exopolysaccharides can remarkablyscavenge hydroxyl radicals, superoxide anion free radicals and DPPH free radicals.The sugar content of sugarcane juice was reduced by the fermentation of G. lucidum,and the content of active ingredients, such as polysaccharide increased, so it could beused as a new source of healthy foods.