Interfacial and self-assembly controlled uptake of Bisphenol A in squalane-based dispersions: From micellar solubilization to mesophase confinement

IF 5.2 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2026-10-15 Epub Date: 2026-09-29 DOI:10.1016/j.molliq.2026.129948

Samuel Guillot, Sandrine Delpeux, Aude Gagner, Cyrine Mejri, Hamidréza Ramézani, Fabienne Méducin, Louis Hennet

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引用次数: 0

Abstract

This study investigates the mechanisms governing Bisphenol A (BPA) uptake from water in squalane-based dispersed systems, deliberately chosen as a poor solvent for BPA to decouple bulk partitioning effects from interfacial and self-assembly-driven processes. The objective is to determine how formulation parameters control BPA localization across the different compartments of complex liquid systems. In the absence of lipids, interfacial tension measurements reveal that BPA exhibits interfacial activity at squalane-water interfaces at low emulsifier concentrations. However, this interfacial adsorption does not control the overall uptake. Instead, BPA uptake is primarily governed by the concentration-dependent self-assembly of the triblock copolymer F127 in the aqueous phase. Above the critical aggregation concentration, micelles dominate and act as the main uptake domains, as confirmed by kinetic measurements. Notably, identical uptake behavior is observed for F127 aqueous solutions and squalane-based emulsions when expressed as a function of emulsifier concentration, demonstrating that the presence of oil droplets does not introduce an additional uptake mechanism. A fundamentally different behavior emerges upon the introduction of monolinolein within the droplets, leading to the formation of internally structured L₂ mesophases. This structural transition generates additional internal lipid-water interfaces and results in a marked enhancement of BPA uptake at constant emulsifier concentration. Small-angle X-ray scattering reveals that BPA incorporation induces measurable structural changes within the mesophase, indicating that BPA is not merely adsorbed but confined within the internal lipid-water architecture. Overall, this work demonstrates that BPA uptake in dispersed systems is governed by a transition from bulk micellar solubilization to confinement within internally structured interfaces. These findings provide a molecular-level understanding of solute partitioning in complex liquids and highlight the importance of designing hierarchical interfacial architectures.

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角鲨烷分散体中双酚A的界面和自组装控制吸收：从胶束增溶到中间相约束

本研究探讨了角鲨烷为基础的分散系统中双酚A （BPA）从水中吸收的机制，故意选择双酚A作为低溶剂来解耦界面和自组装驱动过程的体积分配效应。目的是确定配方参数如何控制复杂液体系统中不同隔间的双酚a定位。在没有脂类的情况下，界面张力测量显示，在低乳化剂浓度下，BPA在角鲨烷-水界面上表现出界面活性。然而，这种界面吸附并不控制总体吸收。相反，BPA的吸收主要是由三嵌段共聚物F127在水相中的浓度依赖的自组装控制的。在临界聚集浓度以上，胶束占主导地位，并作为主要摄取域，正如动力学测量所证实的那样。值得注意的是，当以乳化剂浓度的函数表示时，F127水溶液和角鲨烷基乳剂的摄取行为相同，这表明油滴的存在不会引入额外的摄取机制。在液滴中引入单油苷后，一种完全不同的行为出现，导致内部结构L2中间相的形成。这种结构转变产生了额外的内部脂水界面，并导致在恒定乳化剂浓度下BPA摄取的显著增强。小角度x射线散射显示BPA的掺入在中间阶段引起了可测量的结构变化，表明BPA不仅被吸附，而且被限制在内部脂水结构中。总的来说，这项工作表明，分散系统中的双酚a吸收是由内部结构界面内从体胶束增溶到限制的过渡所控制的。这些发现提供了分子水平上对复杂液体中溶质分配的理解，并强调了设计分层界面结构的重要性。

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

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.