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Contrast Variation Small-Angle Neutron Scattering Study of Solubilization of Perfumes in Cationic Surfactant Micelles
Langmuir ( IF 3.7 ) Pub Date : 2021-08-29 , DOI: 10.1021/acs.langmuir.1c01489 Masaaki Akamatsu 1 , Kai Saito 1 , Hiroki Iwase 2 , Taku Ogura 3, 4 , Kenichi Sakai 1, 4 , Hideki Sakai 1, 4
Langmuir ( IF 3.7 ) Pub Date : 2021-08-29 , DOI: 10.1021/acs.langmuir.1c01489 Masaaki Akamatsu 1 , Kai Saito 1 , Hiroki Iwase 2 , Taku Ogura 3, 4 , Kenichi Sakai 1, 4 , Hideki Sakai 1, 4
Affiliation
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Perfume solubilization is an important process in the production of commercial products such as beverages, foods, and cosmetics. In the present study, small-angle neutron scattering (SANS) experiments were performed to investigate the solubilization behavior of perfumes in cetyltrimethylammonium bromide (CTAB) micelles. The solubilization of linalool (LL) and l-menthol (MT), which are relatively hydrophilic perfumes, did not change the size of the CTAB micelles although the perfumes were incorporated in the micelles, as indicated by a decrease in scattering length density. On the other hand, the solubilization of d-limonene (LN), a hydrophobic perfume, led to the swelling of CTAB micelles. An internal contrast variation SANS study was performed by the deuteration of CTAB molecules to directly observe the perfumes in the micelles. The radius of d-CTAB micelles solubilizing LL or MT corresponds to that of h-CTAB, which indicates that these perfumes are accommodated in the palisade layers of the micelles and are homogeneously distributed in the micelles. On the other hand, LN formed small droplets, as indicated by the SANS profile, which implies the solubilization of LN molecules in the core of the CTAB micelles. We found that the relatively hydrophilic perfumes (LL and MT) show less impact on the sizes of the cationic micelles in comparison to nonionic micelles. Thus, the internal contrast variation method of SANS allowed the direct observation of the solubilization sites of perfumes with different hydrophilicity–hydrophobicity balances. This method is a powerful tool to determine the solubilization states that affect the solubilization capacity, volatilization, or release speed of perfumes.
中文翻译：
阳离子表面活性剂胶束中香料增溶的对比变化小角中子散射研究
香水增溶是饮料、食品和化妆品等商业产品生产中的一个重要过程。在本研究中，进行了小角度中子散射 (SANS) 实验以研究香料在十六烷基三甲基溴化铵 (CTAB) 胶束中的增溶行为。芳樟醇 (LL) 和l-薄荷醇 (MT) 是相对亲水的香料，它们的溶解不会改变 CTAB 胶束的大小，尽管香料被掺入胶束中，如散射长度密度的降低所示。另一方面，溶解d-柠檬烯 (LN) 是一种疏水性香料，导致 CTAB 胶束膨胀。内部对比度变化 SANS 研究是通过 CTAB 分子的氘化来直接观察胶束中的香料。d- CTAB胶束溶解LL或MT的半径对应于h的半径-CTAB，这表明这些香料被容纳在胶束的栅栏层中并且均匀分布在胶束中。另一方面，LN 形成了小液滴，如 SANS 曲线所示，这意味着 LN 分子在 CTAB 胶束的核心中溶解。我们发现与非离子胶束相比，相对亲水的香料（LL 和 MT）对阳离子胶束尺寸的影响较小。因此，SANS 的内部对比度变化方法允许直接观察具有不同亲水性-疏水性平衡的香水的增溶位点。该方法是确定影响香料溶解能力、挥发或释放速度的溶解状态的有力工具。
更新日期：2021-09-14
中文翻译：
阳离子表面活性剂胶束中香料增溶的对比变化小角中子散射研究
香水增溶是饮料、食品和化妆品等商业产品生产中的一个重要过程。在本研究中，进行了小角度中子散射 (SANS) 实验以研究香料在十六烷基三甲基溴化铵 (CTAB) 胶束中的增溶行为。芳樟醇 (LL) 和l-薄荷醇 (MT) 是相对亲水的香料，它们的溶解不会改变 CTAB 胶束的大小，尽管香料被掺入胶束中，如散射长度密度的降低所示。另一方面，溶解d-柠檬烯 (LN) 是一种疏水性香料，导致 CTAB 胶束膨胀。内部对比度变化 SANS 研究是通过 CTAB 分子的氘化来直接观察胶束中的香料。d- CTAB胶束溶解LL或MT的半径对应于h的半径-CTAB，这表明这些香料被容纳在胶束的栅栏层中并且均匀分布在胶束中。另一方面，LN 形成了小液滴，如 SANS 曲线所示，这意味着 LN 分子在 CTAB 胶束的核心中溶解。我们发现与非离子胶束相比，相对亲水的香料（LL 和 MT）对阳离子胶束尺寸的影响较小。因此，SANS 的内部对比度变化方法允许直接观察具有不同亲水性-疏水性平衡的香水的增溶位点。该方法是确定影响香料溶解能力、挥发或释放速度的溶解状态的有力工具。
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