Phase separation behaviour during direct solvent extraction of Corynebacterium glutamicum fermentation broth – Systematic study of crud suppression

Q2 Materials Science
Jörg Eberz , Lara Strehl , Marcel Mann , Andreas Jupke , Jørgen Barsett Magnus
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引用次数: 0

Abstract

The economic competitiveness of bio-based production processes is often hindered by the high costs associated with downstream processing, compared to fossil-based methods. Liquid-liquid extraction is a widely used technique for aqueous fermentation systems and offers significant cost-saving potential, especially if extraction could be performed directly from the fermentation broth without prior cell separation. However, this is often hindered by the formation of "crud" — a deposit or emulsion at the interface between two partially settled phases. This study investigates the liquid-liquid phase separation of Corynebacterium glutamicum DM 1933 fermentation broths using five different solvents. We systematically examined the impact of cell surface properties, modified through nutrient concentration, on crud formation. In addition, the variation in salt concentration and pH after fermentation was analysed. Our findings show that the present nutrient concentration influences the cell surface properties and, consequently, crud formation. A more hydrophilic cell surface was present at a lower phosphate concentration, whereas a more hydrophobic cell surface was measured for a lower nitrogen and iron concentration. With a more hydrophobic cell surface, the fermentation broth showed a large crud phase, while a decrease in crud formation could be seen for fermentation broths with a more hydrophilic cell surface. Furthermore, the crud formation is influenced by the pH, cell and salt concentration and strongly by the used solvent.
直接溶剂萃取谷氨酸棒状杆菌发酵液的相分离行为——抑菌系统研究
与基于化石的方法相比,与下游加工相关的高成本往往阻碍了生物基生产过程的经济竞争力。液-液萃取是一种广泛应用于水发酵系统的技术,具有显著的成本节约潜力,特别是如果可以直接从发酵液中提取而无需事先分离细胞。然而,这常常被“杂质”的形成所阻碍,“杂质”是在两个部分沉淀相之间的界面上形成的沉积物或乳液。研究了5种不同溶剂对谷氨酸棒状杆菌DM 1933发酵液的液-液相分离。我们系统地检查了细胞表面特性的影响,通过营养浓度修改,对原油的形成。并对发酵后盐浓度和pH值的变化进行了分析。我们的研究结果表明,目前的营养浓度影响细胞的表面性质,因此,杂质的形成。磷酸盐浓度较低时,细胞表面亲水性较强;氮和铁浓度较低时,细胞表面疏水性较强。当细胞表面疏水程度越高时,发酵液中有大量的污垢,而当细胞表面亲水程度越高时,发酵液中污垢的形成就会减少。此外,产物的形成受pH、细胞和盐浓度的影响,并受所用溶剂的强烈影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Current Research in Green and Sustainable Chemistry
Current Research in Green and Sustainable Chemistry Materials Science-Materials Chemistry
CiteScore
11.20
自引率
0.00%
发文量
116
审稿时长
78 days
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