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首页> 外文期刊>Biotechnology Progress >Interactions Between Surfactants and Biomass During Liquid-Liquid Extraction
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Interactions Between Surfactants and Biomass During Liquid-Liquid Extraction

机译：液体萃取过程中表面活性剂与生物质之间的相互作用

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Fermentation systems can contain may surface-active compounds that can interfere with downstream separation processes. This work examines the interactions that can occur between surfactants and biomass during solute mass transfer in a liquid-liquid extraction system. Adding the surfactants sodium dodecyl sulfate and dodecyl trimethyl ammonium bromide to the aqueous phase caused a substantial increase in the mass transfer of chloramphenicol between water and octanol. Further investigation of the interfacial region using an optical Schlieren apparatus revealed that these increases were due to interfacial turbulence that gave rise to a rapid surface renewal convective mass transfer mechanism. When microbial biomass was present with sodium dodecyl sulfate, an increase in the mass transfer rate was again found, however, to a lesser extent. In contrast, dodecyl trimethyl ammonium bromide did not promote mass transfer and it is postulated that electrical interactions between the surfactant and the cell surface prevented adsorption of either at the interface. The interaction between the antifoaming agent polypropylene glycol 2000 and extraction system components was also investigated, with both positive and negative effects being recorded under varying conditions.
机译：发酵系统可能包含可能干扰下游分离过程的表面活性化合物。这项工作研究了液-液萃取系统中溶质传质过程中表面活性剂与生物质之间可能发生的相互作用。将表面活性剂十二烷基硫酸钠和十二烷基三甲基溴化铵添加到水相中，导致氯霉素在水和辛醇之间的传质大大增加。使用光学Schlieren仪器对界面区域的进一步研究表明，这些增加是由于界面湍流引起的，该湍流引起了快速的表面更新对流传质机制。当微生物生物量与十二烷基硫酸钠一起存在时，再次发现传质速率有所增加，但是程度较小。相反，十二烷基三甲基溴化铵不促进传质，并且推测表面活性剂与细胞表面之间的电相互作用阻止了二者在界面处的吸附。还研究了消泡剂聚丙二醇2000与萃取系统组分之间的相互作用，并记录了在不同条件下的正面和负面影响。

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