Effect of peptone on ethanol production
To examine the effect of peptone on ethanol production various concentrations that is, 0.5 to 2.5 g/l were used keeping rest of the parameters at their optimal conditions. Data in Figure 5 shows that as the concentration of peptone increased from 0.5 to 1.5 g/l, ethanol production increases from 6.83 to 7.58% for S. cerevisiae, above this concentration ethanol production was decreased when potato (Kufri Bahar) was used as substrate. Wang et al. (2007) observed that peptone was a critical factor