期刊
BIORESOURCE TECHNOLOGY
卷 368, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.128324
关键词
Sugarcane bagasse; D-lactic acid; Water-soluble carbohydrates; One-pot fermentation; 5-Hydroxymethylfurfural
This study showed that fermenting water-soluble carbohydrates in sugarcane bagasse into D-lactic acid before pretreatment could enhance lactic acid production and reduce the generation of 5-hydroxymethylfurfural. This strategy provides an efficient way to utilize the lignocellulosic waste from the sugar industry for lactic acid production.
After several rounds of milling process for sugars extraction from sugarcane, certain amounts of water-soluble carbohydrates (WSC) still remain in sugarcane bagasse. It is a bottleneck to utilize WSC in sugarcane bagasse biorefinery, since these sugars are easily degraded into inhibitors during pretreatment. Herein, a simple prefermentation step before pretreatment was conducted, and 98 % of WSC in bagasse was fermented into D-lactic acid. The obtained D-lactic acid was stably preserved in bagasse and 5-hydroxymethylfurfural (HMF) generation was sharply reduced from 46.0 mg/g to 6.2 mg/g of dry bagasse, after dilute acid pretreatment. Consequently, a higher D-lactic acid titer (57.0 g/L vs 33.2 g/L) was achieved from the whole slurry of the undetoxified and pretreated sugarcane bagasse by one-pot simultaneous saccharification and co-fermentation (SSCF), with the overall yield of 0.58 g/g dry bagasse. This study gave an efficient strategy for enhancing lactic acid production using the lignocellulosic waste from sugar industry.
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