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Production of bio-sugar and bioethanol from coffee residue (CR) by acid-chlorite pretreatment
- Kim, Ho Myeong, Choi, Yong-Soo, Lee, Dae-Seok, Kim, Yong-Hwan, Bae, Hyeun-Jong
- Bioresource technology 2017 v.236 pp. 194-201
- bioethanol, ethanol, ethanol production, fermentation, roasting, saccharification, solvents, sugars
- Nowadays, coffee residue (CR) after roasting is recognized as one of the most useful resources in the world for producing the biofuel and bio-materials. In this study, we evaluated the potential of bio-sugar and bioethanol production from acid-chlorite treated CR. Notably, CR treated three times with acid-chlorite after organic solvent extraction (OSE-3), showed the high monosaccharide content, and the efficient sugar conversion yield compared to the other pretreatment conditions. The OSE-3 (6% substrate loading, w/v) can produce bio-sugar (0.568g/g OSE-3). Also, simultaneous saccharification and fermentation (SSF) produced ethanol (0.266g/g OSE-3), and showed an ethanol conversion yield of 73.8% after a 72-h reaction period. These results suggest that acid-chlorite pretreatment can improve the bio-sugar and bioethanol production of CR by removing the phenolic and brown compounds.