Table 1.

Ethanol yield under different algae pretreatment conditions and substrate concentration

Pretreatment method	Substrate concentration (g.L−1)	soluble sugar (mg.g−1)	Ethanol yield (g.g−1)
Without pretreatment	10	6.5 ± 0.14	0.055 ± 0.016
Without pretreatment	20	7.79 ± 0.26	0.148 ± 0.005
Without pretreatment	30	8.05 ± 0.18	0.101 ± 0.012
Without pretreatment	40	7.37 ± 0.49	0.078 ± 0.015
Heating pretreatment	10	25.98 ± 1.33	0.090 ± 0.007
Heating pretreatment	20	41.54 ± 0.87	0.180 ± 0.009
Heating pretreatment	30	37.78 ± 1.12	0.113 ± 0.011
Heating pretreatment	40	36.32 ± 2.01	0.083 ± 0.003
Enzymatic hydrolysis	10	35.81 ± 1.09	0.102 ± 0.017
Enzymatic hydrolysis	20	42.19 ± 2.08	0.177 ± 0.008
Enzymatic hydrolysis	30	40.77 ± 1.33	0.109 ± 0.011
Enzymatic hydrolysis	40	37.83 ± 3.85	0.116 ± 0.004