Enhanced Accumulation of Scopoletin in Cell Suspension Culture of Spilanthes acmella Murr. Using Precursor Feeding

In this study, the various concentrations of casein hydrolysate (25, 50, 75, 100 mg/L) and L-phenylalanine (50, 100, 150, 200 mu M/l) were incorporated in MS containing 15 mu M BA plus 5 mu M 2,4-D for enhancement of secondary metabolites in cell culture of Spilanthes acmella. The presence of casein hydrolysate in the nutrient medium improved the growth of cell biomass and the production of scopoletin. The addition of casein hydrolysate up to 75 mg/L stimulated the accumulation of scopoletin, but increasing excess 75 mg/L the level of casein hydrolysate reduced the production of scopoletin. The addition of L-phenylalanine in the nutrient medium was found to be more effective for production of secondary metabolite in S. acmella. The addition of 50 mu M/L of L-phenylalanine in the medium increased scopoletin content to 27.12 +/- 0.58 mu g/g dry weight, compared to the scopoletin content of control at 7.89 +/- 0.61 mu g/g dry weight. The highest accumulation of scopoletin was observed in the 100 mu M/L L-phenylalanine in cell suspension, which was 4.51 times more than the control. As a result, using moderate concentration of L-phenylalanine was ideal for the production of scopoletin. In general, casein hydrolysate was more effective than L-phenylalanine for production of scopoletin and growth of cell biomass in the cell culture of S. acmella.