Table 1.

Comparison of various pretreatment utilized to produce bioethanol

Feedstock	Methodology	Ethanol yield	Refences
Water hyacinth	Fermentation by Malt and Barley (5%, 10% and equal %) for 7 days at 30 °C	1.019 mg/L	Rezania et al. (2014)
Pistia stratiotes	Physical pretreatment by milling the sample to 0.2–2 mm size	0.205 mg/mL	Sunil and et al. (2015)
	Fermentation by S. cerevisiae for 7 days
Alternanthera sessilis	Acid hydrolysis by H2SO4	0.387 mg/mL
	Fermentation by S. cerevisiae for 7 days
Parthenium hysterophorus	Steam explosion pretreatment for 15 min	0.219 mg/mL	Gupta and et al. (2017)
	Enzymatic hydrolysis by Aspergillus niger for 24 h at 40 °C
	Fermentation by S. cerevisiae for 96 h days a 30 °C
Elephant ear plant	Steam explosion pretreatment for 15 min	1.130 mg/mL	This study
	Hydrolysis was conducted by cellulases for 24 h at 35 °C
	Fermentation by S. cerevisiae for 5 days at room temperature (30 ± 5 °C)