Design and Optimization of a Process for Sugarcane Molasses Fermentation by Saccharomyces cerevisiae Using Response Surface Methodology

Table 4

Optimum conditions solutions for bioethanol production.

Number of trials	Incubation period h	Initial pH	Incubation temperature °C	Molasses conc wt%	Desirability	Bioethanol yield g/L		Percent error	StD*
						Predicted	experimental
1	67.54	5.88	39.21	20.43	1.000	245.1	248	1.18	1.45
2	26.79	6.35	20.31	22.89	1.000	245.2	247	0.73	0.9
3	25.00	6.21	20.39	21.84	1.000	248.8	250	0.48	0.6
4	71.25	5.59	38.14	17.52	1.000	252.7	255	0.9	1.15
5	71.05	5.36	39.41	20.23	1.000	247.5	249	0.6	0.75
6	26.74	6.15	20.20	20.68	1.000	245.5	248	1.02	1.25
7	30.11	6.39	20.23	22.02	1.000	244.1	247	1.18	1.45

∗StD: standard deviation.