Nuclear magnetic resonance is applied to investigate the relative positions and interactions between cationic and non-ionic carbohydrate-based surfactants in mixed micelles with D2O as the solvent.This is accomplished using relaxation measurements (spin-lattice (T1) and spin-spin (T2) analysis) and nuclear Overhauser effect spectroscopy (NOESY).This study focuses on the interactions of n-octyl β-D-glucopyranoside (C8G1) and β-D-xylopyranoside (C8X1) with cationic surfactant hexadecyltrimethylammonium bromide (C16TAB).While the interactions between carbohydrate and cationic surfactants are thermodynamically favorable, the NOESY results suggest that both of the sugar head groups are located preferentially at the interior core of the mixed micelles, so that they are not directly exposed to the bulk solution. The more hydrophilic sugar headgroups of C8G1 have more mobility than sugar heads of C8X1 due to increased hydration. Here for the first time an inverted carbohydrate configuration in mixed micelles is proposed and supported by fluorescence spectroscopy experiments.This inverted carbohydrate headgroup configuration would limit the use of these mixed surfactants when access to the carbohydrate headgroup is important, but may present new opportunities where the carbohydrate-rich core of the micelles can be exploited.
This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 11 November 2016.
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