Sophorolipid biosynthesis and production from diverse hydrophilic and hydrophobic carbon substrates
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Sophorolipids (SLs), mainly synthesized by yeasts, were a sort of biosurfactant with the highest fermentation level at present. In recent years, SLs have drawn extensive attention for their excellent physiochemical properties and physiological activities. Besides, issues such as economics, sustainability, and use of renewable resources also stimulate the shift from chemical surfactants towards green or microbial-derived biosurfactants. SLs’ large-scale production and application were restricted by the relatively high production costs. Currently, waste streams from agriculture, food and oil refining industries, etc., have been exploited as low-cost renewable substrates for SL production. Advanced cultivation method, uncommonly used substrates, and new genetically modified SL-producing mutants were also designed and applied to improve the productivity or the special properties of SLs. In this review, a systematic and detailed description of primary and secondary metabolism pathways involved in SL biosynthesis was summarized firstly. Furthermore, based on the pathways of SL biosynthesis from different carbon substrates, we reviewed the current knowledge and advances in the exploration of cost-effective and infrequently used hydrophilic and hydrophobic substrates for large or specialized SL production.
Keywordssophorolipids biosynthesis pathways hydrophilic substrates hydrophobic substrates cultivation methods
This work was supported by the Fundamental Research Funds for the Central Universities of China (No. JZ2019YYPY0029), the National Natural Science Foundation of China (No. 31400049), and the China Postdoctoral Science Foundation (No. 2015T80646).
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Conflict of interest
The authors declare that they have no conflict of interest.
The article does not contain any studies with human participants or animals performed by any of the authors.
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