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Sophorose lipid fermentation with differentiated substrate supply for growth and production phases

机译:槐糖脂发酵,为生长和生产阶段提供不同的底物供应

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摘要

Sophorose lipid production by Candida bombicola is a two-step process where sophorose lipids are mainly produced after a first stage of growth, ending because of nitrogen limitation. The influence of the following parameters was individually studied for both the stages of growth and of product formation with respect to final sophorose lipid production performance: pH, temperature and carbon source. Glucose and rapeseed ethyl esters were supplied individually or as a dual carbon source. The lipidic substrate was added by continuous feeding. It was found that supplying both carbon sources during the production step was crucial for obtaining a high production performance ranging from 250 g l(-1) to 300 g l(-1) or more. Controlling the feeding of rapeseed ethyl esters to avoid inhibition by fatty acids was essential for a successful scale-up of the fermentation on the industrial scale. The conditions of substrate feeding markedly affected the composition of the mixture of sophorose lipids produced, namely the extent of acetylation of the sophorose moieties and distribution of the acidic and lactonic forms. The results suggest that the physiological role of sophorose lipid production is related to the regulation of energy metabolism.
机译:念珠菌生产槐糖脂的过程分为两个步骤,其中槐糖脂主要在生长的第一阶段后生产,由于氮的限制而终止。对于最终的槐糖脂质生产性能,分别针对生长阶段和产物形成阶段分别研究了以下参数的影响:pH,温度和碳源。葡萄糖和油菜籽乙酯分别提供或作为双碳源提供。通过连续进料添加脂质底物。发现在生产步骤中提供两种碳源对于获得250 g l(-1)至300 g l(-1)或更高的高生产性能至关重要。为了在工业规模上成功扩大发酵规模,控制油菜籽乙酯的进料以避免被脂肪酸抑制是必不可少的。底物进料的条件显着影响所产生的槐糖脂质混合物的组成,即槐糖部分的乙酰化程度以及酸性和内酯形式的分布。结果表明,槐糖脂产生的生理作用与能量代谢的调节有关。

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