Abstract
Lime (calcium hydroxide) was used as a pretreatment agent to enhance the enzymatic digestibility of switchgrass. After studying many conditions, the recommended pretreatment conditions are: time = 2 h, temperature = 100°C and 120°C, lime loading = 0.1 g Ca(OH)2/g dry biomass, water loading = 9 mL/g dry biomass. Studies on the effect of particle size indicate that there was little benefit of grinding below 20 mesh; even coarse particles (4–10 mesh) digested well. Using the recommended pretreatment conditions, the 3-d reducing sugar yield was five times that of untreated switchgrass, the 3-d total sugar (glucose + xylose) yield was seven times, the 3-d glucose yield was five times, and the 3-d xylose yield was 21 times. A material balance study showed that little glucan (approx 10%) was solubilized as a result of the lime pretreatment, whereas about 26% of xylan and 29% of lignin became solubilized.
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Chang, V.S., Burr, B., Holtzapple, M.T. (1997). Lime Pretreatment of Switchgrass. In: Davison, B.H., Wyman, C.E., Finkelstein, M. (eds) Biotechnology for Fuels and Chemicals. Applied Biochemistry and Biotechnology, vol 63-65. Humana Press. https://doi.org/10.1007/978-1-4612-2312-2_2
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DOI: https://doi.org/10.1007/978-1-4612-2312-2_2
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