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A Liquid‐Crystal‐Based System for Differentiating Structurally Related Analytes
ChemistrySelect ( IF 2.1 ) Pub Date : 2018-06-13 , DOI: 10.1002/slct.201800492
Kirtika Mishra 1 , Sachin Kumar Singh 2 , Bachcha Singh 1
Affiliation  

We report a new approach for differentiating structurally related analytes using a liquid crystal (LC) based system. In this work we have combined two principles (analyte‐surfactant interactions and host‐guest inclusion) at LC/aqueous interface to differentiate structurally related analytes methyl red (MR) and methyl orange (MO). On introducing MR/MO in aqueous solution containing sodium dodecyl sulfate (SDS), the optical response of 4‐cyano‐4′‐pentylbiphenyl (5CB) changes from dark to bright in presence of MR but remains same in the presence of MO. This observation implies interaction of analyte (MR) and surfactant (SDS), thus effectively displacing SDS adsorbed at the 5CB/aqueous interface. Further, competitive inclusion complex formation of β‐cyclodextrin (β‐CD) with SDS or with analyte (dye, MR/MO) was visualized through changes in the optical response of 5CB at SDS‐laden 5CB/aqueous interface. On addition of MR/MO to the SDS‐β‐CD complex solution the optical response of 5CB changes from bright to dark in presence of MO but remains same in the presence of MR. This implicates that homeotropic orientation of 5CB resulted due to the reorganization of displaced SDS molecules from β‐CD cavity at the 5CB/aqueous interface. Overall, this LC based system demonstrates differentiation of structurally related analytes in the absence and presence of β‐CD.

中文翻译:

基于液晶的区分结构相关分析物的系统

我们报告了一种使用基于液晶(LC)的系统区分结构相关分析物的新方法。在这项工作中,我们结合了液相色谱/水界面的两个原理(分析物-表面活性剂相互作用和主客体夹杂物)来区分与结构相关的分析物甲基红(MR)和甲基橙(MO)。在含有十二烷基硫酸钠(SDS)的水溶液中引入MR / MO时,在MR存在下,4-氰基-4'-戊基联苯(5CB)的光学响应从暗变为亮,但在MO存在下保持不变。该观察结果暗示了分析物(MR)和表面活性剂(SDS)的相互作用,从而有效地置换了吸附在5CB /水界面上的SDS。此外,与SDS或与分析物(染料,通过在载有SDS的5CB /水界面处5CB的光学响应发生变化来可视化MR / MO)。在SDS-β-CD复合溶液中添加MR / MO后,在MO存在下5CB的光学响应会从亮变为暗,而在MR存在下则保持不变。这暗示了5CB的垂直取向是由于5CB /水界面处的β-CD腔中置换的SDS分子的重组所致。总体而言,基于LC的系统证明了在不存在和存在β-CD的情况下,结构相关分析物的区别。这暗示了5CB的垂直取向是由于5CB /水界面处的β-CD腔中置换的SDS分子的重组所致。总体而言,基于LC的系统证明了在不存在β-CD的情况下结构相关分析物的区别。这暗示了5CB的垂直取向是由于5CB /水界面处的β-CD腔中置换的SDS分子的重组所致。总体而言,基于LC的系统证明了在不存在和存在β-CD的情况下,结构相关分析物的区别。
更新日期:2018-06-13
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