Abstract
Switchgrass biomass samples collected at three different stages of maturity were seen degrading into reducing sugars and glucose when exposed to 1-(alkylsulfonic)-3-methylimidazolium Bronsted acidic ionic liquids under thermal and microwave conditions. The highest reducing sugar (58.1 ± 2.1 %) and glucose (15.3 ± 0.5 %) yields were obtained for switchgrass samples dissolved in 1-(butylsulfonic)-3-methylimidazolium chloride ionic liquid by heating at 70 °C for 1 h followed by treatment with 0.22 g water/g switchgrass and then heating at 70 °C for 1 h for the hydrolysis of polysaccharides. The samples treated under microwave conditions produced relatively lower yields of reducing sugar (22.0 ± 1.5–37.2 ± 1.8 %) and glucose (8.0 ± 0.2–12.8 ± 0.4 %) yields, compared to heat-treated samples.
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