Chemistry:N-Methyltaurine
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| C3H9NO3S | |
| Molar mass | 139.17 g·mol−1 |
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| GHS Signal word | Danger |
| H314, H315, H319 | |
| P260, P264, P280, P301+330+331, P302+352, P303+361+353, P304+340, P305+351+338, P310, P321, P332+313, P337+313, P362, P363, P405, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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N-Methyltaurine (2-methylaminoethanesulfonic acid) is an aminosulfonic acid which is present as a zwitterion in the crystalline state and in polar solvents (just like amino acids).[1] In contrast to the widespread taurine, N-methyltaurine has been found in nature only in red algae,[2] where it is formed by methylation of taurine. It is suitable for esterification (actually amide formation) with long-chain carboxylic acids to taurides (acylaminoethansulfonaten) because of its high polarity and the relatively good solubility of its alkaline earth metal salts, which are also used as mild anionic surfactants.[3]
Preparation
The synthesis of N-methyltaurine was reported as early as 1878,[4] with methylamine being reacted with the silver salt of 2-chloroethanesulfonic acid. An obvious modification for this reaction is the replacement of the silver salt of 2-chloroethanesulfonic acid by the sodium salt of 2-chloroethanesulfonic acid.[5] The addition of methylamine to sodium vinylsulfonate in aqueous solution gives N-methyltaurine in 85% yield after acidification with acetic acid.[6] The purification of the crude product and preparation of the N-methyltaurine can also be accomplished by passage of the sodium salt solution through a cation exchange resin in its H form and then through an anion exchange resin in its OH form.[7] The reaction of sodium isethionate with methylamine in water at high temperature and pressure yields the sodium salt of N-methyltaurine[8]
which yields pure N-methyltaurine upon saturation with CO2 and removal of the precipitated sodium bicarbonate.[9]
Properties
N-Methyltaurine is a white powdery solid which is readily soluble in water.
Use
N-Methyltaurine (or its sodium salt) is used as a polar head group in surfactants from the class of taurides (acylaminoethanesulfonates), sometimes also called methyltaurates. The Taurides are characterized by excellent foaming - even in the presence of oil and skin fats - and foam stability, with good skin compatibility and broad pH stability.[10] The market breakthrough for N-methyltaurine as a hair restorer is still pending.[citation needed]
References
- ↑ Kalaitzis, John A; Almeida Leone, Priscila de; Quinn, Ronald J; Healy, Peter C (2003). "Zwitterionic 2-(methylamino)ethanesulfonic acid". Acta Crystallographica Section E 59 (5): o726. doi:10.1107/S160053680300895X.
- ↑ B. Lindberg, Methylated Taurines and Choline Sulfate in Red Algae, Acta Chem. Scand., 9, 1955, pp 1323 – 1326.
- ↑ E.W. Flick, Cosmetic Additives: An Industrial Guide, Noyes Publication, Park Ridge, New Jersey, 1991, ISBN:0-8155-1255-4, S. 352.
- ↑ Dittrich, Eugen (1878). "Ueber Methyltaurin und die Bildung von Methyltaurocyamin und Taurocyamin". Journal für Praktische Chemie 18: 63–78. doi:10.1002/prac.18780180102. https://zenodo.org/record/1427876..
- ↑ Schick, John W; Degering, Ed. F (1947). "Synthesis of Taurine and N-Methyltaurine". Industrial & Engineering Chemistry 39 (7): 906. doi:10.1021/ie50451a024..
- ↑ Kimura, Takuhiro; Tsutomu Tani & Reiji Miyahara, "Process for producing of an aminoalkylsulfonic acid and a method of salt exchange for a salt thereof", US patent 7049464, published 2006-05-23, assigned to Wako Pure Chemical Industries, Ltd.
- ↑ {{Cite patent |country=US|number=2693488|title=Purification of amino alkane sulfonic acids by ion exchange|pubdate =1954-11-02|inventor1-last=Sexton|inventor1-first=Arthur R.|assign1=[[Company:Dow Chemical Company|The Dow Chemical Co.}}
- ↑ Nicodemus, Otto & Walter Schmidt, "Process of preparing aminoalkylsulphonic acids", US patent 1932907, published 1933-10-31, assigned to I.G. Farbenindustrie AG
- ↑ Elbel, Eberhard; Herbert Kaltenhaeuser & Herwig Beck, "Verfahren zur Herstellung von reinem N-Methyltaurin [Process for the production of pure N-methyltaurine]", DE patent 1122540, published 1962-01-25, assigned to Farbwerke Hoechst AG
- ↑ Clariant-Broschüre: Mild Surfactants, (pdf; 801 kB)
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