Arginine laureth sulfate? Arginine Oleate? Warning Deep science inside

Formulating

Arginine laureth sulfate? Arginine Oleate? Warning Deep science inside

Posted by Gunther on May 18, 2018 at 12:41 am

Some vague references to

Arginine laureth sulfate

http://www.thegoodscentscompany.com/data/rw1707791.html

http://biotechnologia.pl/produkty/surowce-kosmetyczne/arginine-laureth-sulfate,603960

http://www.perflavory.com/cosdata/foamboosting.html

but no CAS numbers are given so I guess ‘Arginine Laureth sulfate’ = typo

And Arginine Oleate

https://www.jstage.jst.go.jp/article/jos/54/6/54_6_325/_pdf

It looks interesting as humectant.

While Arginine as the counterion is perfectly feasible

https://www.tandfonline.com/doi/pdf/10.1081/DIS-200063107

I believe they won’t be stable in acidic pH

leaving a lot of Laureth-sulfuric or oleic free acids = irritating to skin.

When pH is at pkb

(about pH= 9.04 for Arginine)

http://www.aminoacidsguide.com/Arg.html

https://www.anaspec.com/html/pK_n_pl_Values_of_AminoAcids.html

50% of laureth-sulfuric or oleic acids will be available as free acid form

so in acidic solutions suitable for hair or skin care, even more than 50% will be available as free acids?

Did I get it right?

like this, only pkb instead of pka

https://www.shimadzu.com/an/hplc/support/lib/lctalk/29/29intro.html

To complicate things even further

Arginine is a polibasic amino acid as it has 3 amino functional groups (actually 1 amino and 1 guanidinium)

so, could a partial salt with only one or 2 of these 3 amino groups, lower the equilibrium pH, thus making it stable?

Gunther replied 6 years, 7 months ago 1 Member · 0 Replies
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