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From Hofmeister to hydrotrope: Effect of anion hydrocarbon chain length on a polymer brush
Robertson, Hayden ; Willott, Joshua D. ; Gregory, Kasimir P. , et al. J. Colloid Interf. Sci.,2023,634,983-994. DOI: 10.1016/j.jcis.2022.12.114 PubMed ID: 36571860
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Abstract: Hypothesis Specific ion effects govern myriad biological phenomena, including protein–ligand interactions and enzyme activity. Despite recent advances, detailed understanding of the role of ion hydrophobicity in specific ion effects, and the intersection with hydrotropic effects, remains elusive. Short chain fatty acid sodium salts are simple amphiphiles which play an integral role in our gastrointestinal health. We hypothesise that increasing a fatty acid’s hydrophobicity will manifest stronger salting-out behaviour. Experiments Here we study the effect of these amphiphiles on an exemplar thermoresponsive polymer brush system, conserving the carboxylate anion identity while varying anion hydrophobicity via the carbon chain length. Ellipsometry and quartz crystal microbalance with dissipation monitoring were used to characterise the thermoresponse and viscoelasticity of the brush, respectively, whilst neutron reflectometry was used to reveal the internal structure of the brush. Diffusion-ordered nuclear magnetic resonance spectroscopy and computational investigations provide insight into polymer-ion interactions. Findings Surface sensitive techniques unveiled a non-monotonic trend in salting-out ability with increasing anion hydrophobicity, revealing the bundle-like morphology of the ion-collapsed system. An intersection between ion-specific and hydrotropic effects was observed both experimentally and computationally; trending from good anti-hydrotrope towards hydrotropic behaviour with increasing anion hydrophobicity, accompanying a change in hydrophobic hydration.
Keywords: Hofmeister ; Hydrophobic effect ; Hydrotrope ; Polymer brush ; Short-chain fatty acids ; Specific ion effects ; Surface chemistry ; Thin films
Purchased from AmBeed: 6106-41-8
CAS No. : | 6106-41-8 | MDL No. : | MFCD00066205 |
Formula : | C5H9NaO2 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | LHYPLJGBYPAQAK-UHFFFAOYSA-M |
M.W : | 124.11 | Pubchem ID : | 3669864 |
Synonyms : |
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Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | N/A |
GHS Pictogram: |
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* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In acetone; | (1) A mixture of 9-bromoacetyl-6,9,11-trihydroxy-5,7,8,9,10,12-hexahydronaphthacene-5,12-dione (1.00 g) obtained in Reference Example 1-(1), <strong>[6106-41-8]sodium valerate</strong> (1.44 g) and acetone (50 ml) was stirred under reflux for 5 hours, cooled to room temperature and concentrated under reduced pressure. The residue was triturated with an adequate quantity of ether, and solid substances were filtered to give reddish crystals of 9-valeryloxyacetyl-6,9,11-trihydroxy-5,7,8,9,10,12-hexahydronaphthacene-5,12-dione. M.P., 170°-172° C. IR (Nujol) nucm-1: 3400, 1775, 1770, 1620, 1585. NMR (CDCl3) delta: 0.83-3.15 (m, 16H), 5.12 (bs, 2H), 7.80 (m, 2H), 8.30 (m, 2H), 13.37 (bs, 2H). | |
In acetone; | (1) A mixture of 9(R)-bromoacetyl-6,9,11-trihydroxy-5,7,8,9,10,12-hexahydronaphthacene-5,12-dione (1.00 g) obtained in Reference Example 4-(1), <strong>[6106-41-8]sodium valerate</strong> (1.44 g) and acetone (50 ml) was stirred under reflux for 2 hours. After removing insoluble matters by filtration, the reaction mixture was concentrated under reduced pressure. The residue was treated with ether (15 ml) and precipitated crystals were collected by filtration to give orange crystals of 9(R)-valeryloxyacetyl-6,9,11-trihydroxy-5,7,8,9,10,12-hexahydronaphthacene-5,12-dione. M.P., 149°-152° C. IR (Nujol) nucm-1: 1730, 1620, 1585. NMR (CDCl3) delta: 1.93 (t, J=6 Hz, 3H), 1.16-2.30 (m, 6H), 2.32-2.63 (m, 2H), 2.93 (bs, 4H), 5.20 (s, 2H), 7.60-7.87 (m, 2H), 8.00-8.26 (m, 2H). |
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