Database/Antistatic/Hydroxypropyltrimonium Hydrolyzed Soy Protein
Mostly natural · ISO 16128

Is Hydroxypropyltrimonium Hydrolyzed Soy Protein natural?

Mostly. Soy peptide backbone is a natural hydrolysate; the cationic hydroxypropyltrimonium group is built from petrochemical epichlorohydrin and trimethylamine.

INCI nameHydroxypropyltrimonium Hydrolyzed Soy Protein
CAS156715-44-5
FunctionAntistatic · Hair Conditioning
FeedstockHydrolyzed soy protein from enzymatic digestion of soybean…

How we scored it

Assumed DS ~1 quat site/1000Da protein: natural soy peptide (1000)+Cl-(35)=1035; petrochemical hydroxypropyltrimethylammonium group (from epichlorohydrin+trimethylamine)=147. 1035/1182≈0.88.
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

Hydrolyzed soy protein from enzymatic digestion of soybean protein is reacted with glycidyltrimethylammonium chloride, a petrochemical quaternizing agent, to give a cationic conditioning agent. Degree of substitution is assumed low, so the protein dominates total mass.

In plain English

A conditioning ingredient made from soy protein that has been broken down and given a mild positive charge so it clings to hair and skin. The protein comes from soybeans; the charged group is made synthetically.

CosIng definition: Proteins, soy (Glycine soja), hydrolyzed, N-(3-trimethylammonio-2-hydroxypropyl)-, chlorides

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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. 2HYDROXYPROPYLTRIMONIUM HYDROLYZED SOY PROTEIN. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  3. 3HYDROXYPROPYLTRIMONIUM HYDROLYZED SOY PROTEIN. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=HYDROXYPROPYLTRIMONIUM%20HYDROLYZED%20SOY%20PROTEIN