Abstract
2-Hydroxy-4-(methylthio)butanoic acid (HMTBA) is a commonly used animal feed additive available in large quantities. In this study, anionic surfactants were synthesized utilizing HMTBA as a starting material. Specifically, a straight-chain fatty acid containing 12 or 16 carbon atoms was attached to the hydroxyl group via esterification. After neutralization of the carboxylic acid with sodium, the molecules behave as anionic surfactants. Oxidation of the sulfur atom can be performed to further increase water solubility. The molecules exhibit critical micelle concentrations (CMCs), and lower the surface tension to 35–45 mN/m at the CMC. The derivatives have low Krafft points (<4 °C) and good wetting performance. The hardness tolerance of the ester made from dodecanoic acid is ~2.5–4 orders of magnitude higher than an analogous carboxylate surfactant, namely sodium dodecanoate. Foam created according to the Ross-Miles foam test is substantial, but dissipates quickly as compared to other anionic surfactants.
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Abbreviations
- HMTBA:
-
2-Hydroxy-4-(methylthio)butanoic acid
- AES:
-
Alkyl ether sulfate
- SDS:
-
Sodium dodecyl sulfate
- SDBS:
-
Sodium dodecylbenzene sulfonate
- CMC:
-
Critical micelle concentration
- γ CMC :
-
Surface tension at the CMC
- Γm :
-
Maximum surface excess concentration/maximum adsorption density
- C20:
-
Surfactant concentration that lowers the surface tension by 20 mN/m
- a min :
-
Minimum area per molecule at the interface
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Yu, G., Long, S.A., Karinshak, K.A. et al. Synthesis and Characterization of Novel Surfactants Based on 2-Hydroxy-4-(Methylthio)Butanoic Acid: 1. Anionic Surfactants. J Surfact Deterg 18, 895–903 (2015). https://doi.org/10.1007/s11743-015-1690-x
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DOI: https://doi.org/10.1007/s11743-015-1690-x