4.8 Article

A novel fermentation strategy for efficient xylose utilization and microbial lipid production in lignocellulosic hydrolysate

期刊

BIORESOURCE TECHNOLOGY
卷 361, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127624

关键词

Xylose utilization; Lignocellulosic inhibitors; Fermentation strategy; DLCA pretreatment; Microbial lipid; Trichosporon dermatis

资金

  1. National Key R & D Program of China [2021YFC2101301, 2016YFE0105400]
  2. National Natural Science Foundation of China [22078160]
  3. Natural Science Foundation of Jiangsu Province [BK20170037]

向作者/读者索取更多资源

This study investigated the sugar consumption and inhibitor tolerance characteristics of Trichosporon dermatis 32,903, and developed a sugar-targeted utilization and cyclic fermentation strategy based on these characteristics, which greatly enhanced lipid production efficiency.
The sugar utilization efficiency and the tolerance of microorganism to inhibitors are essential for lipid production from lignocellulosic biomass. In this study, the sugar consumption and inhibitor tolerance characteristics of Trichosporon dermatis 32,903 were investigated. The results showed that the lipid yield on xylose was much lower than that on glucose, while these substrates exhibited comparative efficiency for cell growth. High inoculum size improved the tolerance of T. dermatis 32,903 to inhibitors. Based on these characteristics, sugar-targeted -utilization and cyclic fermentation strategy was developed. The tolerance of high inoculum size to inhibitors was utilized, glucose was targeted for lipid fermentation and xylose was targeted for cell growth. As a result, the lipid production efficiency was greatly enhanced. The lipid titer in hydrolysate of DLCA (Densifying Lignocel-lulosic biomass with Chemicals followed by Autoclave) pretreated rice straw was improved to as high as 38.4 g/L with lipid yield of 0.207 g/g consumed sugar.

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