Gamagrass varieties as potential feedstock for fermentable sugar production
2012
Xu, Jiele | Zhang, Ximing | Sharma-Shivappa, Ratna R. | Eubanks, Mary W.
To evaluate the potential of gamagrass as a feedstock for biofuels, seven gamagrass varieties were analyzed for their chemical composition and subjected to pretreatment at 121°C using 1% NaOH/H₂SO₄ (w/w) for 60min and enzymatic hydrolysis for fermentable sugar production. Based on total sugar yield, the varieties Eagle Point Devil Corn and Sun Devil were selected for NaOH and H₂SO₄ pretreatment, respectively. The investigation on pretreatment conditions showed that, the conditions applied in gamagrass variety screening (121°C, 1% NaOH/H₂SO₄, 60min) were sufficient to maximize sugar production, such that the total sugar yield of Eagle Point Devil Corn reached 479.6mgg⁻¹ after NaOH pretreatment and that of Sun Devil reached 456.5mgg⁻¹ raw biomass after H₂SO₄ pretreatment. Compared with other potential energy crops including switchgrass and Bermuda grass, gamagrass gave a higher sugar yield after NaOH pretreatment and a comparable sugar yield after H₂SO₄ pretreatment.
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