Bio-Energy Research Center, Chonnam National University, Gwangju 61186, Republic of Korea.
Department of Agricultural Biology, RDA, National Academy of Agriculture Sciences, Wanju 55365, Republic of Korea.
Bioresour Technol. 2017 Jul;236:194-201. doi: 10.1016/j.biortech.2017.03.143. Epub 2017 Mar 28.
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.
如今，烘焙后的咖啡渣（CR）被认为是世界上最有用的资源之一，可用于生产生物燃料和生物材料。在这项研究中，我们评估了用亚氯酸处理 CR 生产生物糖和生物乙醇的潜力。值得注意的是，与其他预处理条件相比，经过有机溶剂提取（OSE-3）后用亚氯酸处理三次的 CR 表现出较高的单糖含量和高效的糖转化率。OSE-3（底物加载量为 6%，w/v）可生产生物糖（每克 OSE-3 为 0.568 克）。此外，同步糖化发酵（SSF）生产乙醇（每克 OSE-3 为 0.266 克），在 72 小时的反应期后，乙醇转化率达到 73.8%。这些结果表明，亚氯酸预处理可以通过去除酚类和棕色化合物来提高 CR 的生物糖和生物乙醇产量。
