Table 2.

Kinetic parameters for ethanol production from detoxified sulfuric acid hydrolysate after detoxification and enzymatic hydrolysates by Scheffersomyces shehatae UFMG HM 52.2 and Saccharomyces cerevisiae 174, respectively

Parameters	Hemicellulose hydrolysate	Enzyme hydrolysate
	S. shehatae a	S. cerevisiae b
Initial sugars (gs/l)	23.64	36.65
Sugar consumed (%)	100	100
Ethanol produced (gp/l)	9.11	8.13
Ethanol yield (gp/gs)	0.38	0.22
Ethanol productivity (gp/l/h)	0.189	0.11
Biomass produced (gx/l)	3.34	6.55
Biomass yield (gx/gs)	0.07	0.178
Biomass productivity (gx/l/h)	0.141	0.090

^aFermentation of hemicellulose hydrolysate by S. shehatae showed maximum ethanol production (9.11 g/l) after 48 hours, thus ethanol productivity was calculated taking 48 hours into consideration. After 48 hours, sugar consumption was 100%. Biomass productivity was also calculated taking 48 hours into consideration. ^bFermentation of enzymatic hydrolysate by S. cerevisiae showed maximum ethanol production (8.13 g/l) after 72 hours, thus ethanol productivity was calculated taking 72 hours into consideration. After 48 hours, sugar consumption was 100%. Biomass productivity was also calculated taking 72 hours into consideration as it was continuously increasing until 72 hours of incubation.