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首页> 美国卫生研究院文献>Springer Open Choice >Benchmarking the Self-Assembly of Surfactin Biosurfactant at the Liquid–Air Interface to those of Synthetic Surfactants
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Benchmarking the Self-Assembly of Surfactin Biosurfactant at the Liquid–Air Interface to those of Synthetic Surfactants

机译：将表面肌动蛋白生物表面活性剂在液-气界面的自组装与合成表面活性剂的自我组装进行基准比较

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摘要

The adsorption of surfactin, a lipopeptide biosurfactant, at the liquid–air interface has been investigated in this work. The maximum adsorption density and the nature and the extent of lateral interaction between the adsorbed surfactin molecules at the interface were estimated from surface tension data using the Frumkin model. The quantitative information obtained using the Frumkin model was also compared to those obtained using the Gibbs equation and the Langmuir–Szyszkowski model. Error analysis showed a better agreement between the experimental and the calculated values using the Frumkin model relative to the other two models. The adsorption of surfactin at the liquid–air interface was also compared to those of synthetic anionic, sodium dodecylbenzenesulphonate (SDBS), and nonionic, octaethylene glycol monotetradecyl ether (C14E8), surfactants. It has been estimated that the area occupied by a surfactin molecule at the interface is about 3- and 2.5-fold higher than those occupied by SDBS and C14E8 molecules, respectively. The interaction between the adsorbed molecules of the anionic biosurfactant (surfactin) was estimated to be attractive, unlike the mild repulsive interaction between the adsorbed SDBS molecules.
机译：这项工作已经研究了脂蛋白生物表面活性剂表面活性素在液-气界面的吸附。根据表面张力数据，使用Frumkin模型估算了最大吸附密度以及界面上吸附的表面活性素分子之间的横向相互作用的性质和程度。使用Frumkin模型获得的定量信息也与使用Gibbs方程和Langmuir-Szyszkowski模型获得的定量信息进行了比较。误差分析显示，相对于其他两个模型，使用Frumkin模型在实验值和计算值之间具有更好的一致性。还比较了表面活性剂在液-气界面上的吸附与合成阴离子表面活性剂十二烷基苯磺酸钠（SDBS）和非离子表面活性剂八乙二醇单十四烷基醚（C14E8）的吸附能力。据估计，表面活性素分子在界面处所占的面积分别比SDBS和C14E8分子所占的面积高3到2.5倍。阴离子生物表面活性剂（表面活性素）的吸附分子之间的相互作用被认为具有吸引力，这与吸附的SDBS分子之间的轻度排斥相互作用不同。

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