Database/Antistatic/Methylsilanol Acetylmethionate
Route-dependent · ISO 16128

Is Methylsilanol Acetylmethionate natural?

It depends. Methionine is made both by fermentation and by petrochemical synthesis; the acetyl and methylsilanol parts are never natural.

INCI nameMethylsilanol Acetylmethionate
CAS105883-43-0
FormulaC8H17NO5SSi · 267.38 Da
FunctionAntistatic · Hair Conditioning
FeedstockN-acetylmethionine esterified with methylsilanetriol.

Why the score varies

This ingredient is made commercially by more than one route, and ISO 16128 scores the feedstock actually used. Without a supplier certificate of origin the value cannot be claimed.

RouteFeedstockNOIShareNotes
fermentation methionineL-methionine from fermentation, N-acetylated (petrochemical acetyl) and esterified with methylsilanetriol (organosilicon, 0.0)0.55Methionine fragment C5H9NO2S 147.2/267.4 = 0.55.
synthetic methioninemethionine from petrochemical acrolein, methanethiol and hydrogen cyanide0.00No natural-origin atoms.
Ask your supplier. A batch-specific certificate of origin or bio-based carbon test (ASTM D6866) settles which route applies.

How we scored it

Methylsilanol Acetylmethionate C8H17NO5SSi 267.4 Da: methionine fragment C5H9NO2S 147.2 Da is natural only on the fermentation route; the acetyl cap and the methylsilanol group (organosilicon, 0.0 by the site's silicone rule) are petrochemical. Routes: fermentation methionine 0.55, synthetic methionine 0.00. Same treatment as Acetyl Methionine.
What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.

Where it comes from

N-acetylmethionine esterified with methylsilanetriol.

In plain English

A conditioning ingredient combining the amino acid methionine with a small silicon compound, used in hair and skin products to reduce static.

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Structure

2D structure of Methylsilanol Acetylmethionate

[dihydroxy(methyl)silyl] (2S)-2-acetamido-4-methylsulfanylbutanoate

PubChem CID 71587401 ↗

References

  1. 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
  2. 2Methylsilanol Acetylmethionate. PubChem CID 71587401. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3METHYLSILANOL ACETYLMETHIONATE. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4METHYLSILANOL ACETYLMETHIONATE. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=METHYLSILANOL%20ACETYLMETHIONATE