Acidified organosolv solvent pretreatment was performed on coconut coir fibers.
Non-acid-catalyzed AG treatment resulted in low lignin removal and glucan digestibility.
AAG treatment with S/L ratio of 1:20 and 1:30 improved glucan digestibility to 81.8%.
8.97 g/L and 8.81 g/L of ethanol obtained from SSF under anaerobic condition.
Coconut coir fibers, which analyzed 34.8% glucan, 18.3% xylan, 35.8% lignin and 8.7% extractives, were pretreated with acidified aqueous glycerol (10% water) at a solid/liquid ratio loading of 1:20 and 1:30, a temperature of 130 °C and 60,30, and 15 min contact time. The maximum yield of glucan digestibility was 79.7% and 81.8% for the respective solid/liquid ratios for 30 min of pretreatment. The simultaneous saccharification and fermentation was conducted anaerobically at 37 °C with Saccharomyces cerevisiae, 5% w/v glucan, and 10 FPU/g glucan of cellulase. The highest ethanol concentrations obtained after 3 days of incubation from pretreated coconut coir fiber were 8.97 and 8.81 g/L, respectively, for the samples pretreated with acidified aqueous glycerol at 1:30 and 1:20 solid/liquid loading ratio for 30 min.
- Coconut coir fibers;
- Acidified glycerol pretreatment;
- Lignin removal;
- Glucan digestibility;
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