Hydroxyethyl Starch is a modified starch derivative produced by introducing hydroxyethyl groups into starch. It is a nonionic starch derivative and is used in cosmetic and personal-care formulations primarily for viscosity modification, thickening, film formation and formulation texture. Hydroxyethyl starches are prepared from starch sources such as waxy maize starch or potato starch, which are rich in amylopectin.
Hydroxyethyl Starch differs from native starch because some hydroxyl groups on the starch polymer are substituted with hydroxyethyl groups. The degree and pattern of substitution influence the material's molecular characteristics, hydration behavior and formulation performance.
In technical and pharmacopoeial descriptions, Hydroxyethyl Starch is characterized by mean molecular weight (Mw), molar substitution (MS) and C2/C6 substitution ratio. Therefore, Hydroxyethyl Starch is not a single uniform polymer with one fixed molecular weight; commercial grades can differ according to their substitution and molecular-weight characteristics.
Hydroxyethyl Starch can hydrate in aqueous systems and contribute to viscosity and formulation structure. Its polymeric nature makes it useful where formulators require a starch-derived ingredient with modified hydration and rheological characteristics.
Hydroxyethyl Starch can contribute to viscosity in water-based formulations. Its hydration and polymeric structure allow it to modify the consistency and flow characteristics of suitable formulations.
The modified starch structure provides formulation-dependent rheological properties. Grade selection, concentration, molecular weight and degree of substitution influence the final viscosity and texture.
Hydroxyethyl Starch can contribute to film formation on suitable surfaces and can help provide a smooth formulation feel when incorporated at an appropriate concentration.
Hydroxyethyl Starch can be considered for creams, lotions, gels and other water-based skin-care formulations where starch-derived viscosity and texture modification are required.
Its nonionic nature makes Hydroxyethyl Starch suitable for formulation systems where compatibility with a range of cosmetic ingredients is required. Final compatibility should always be evaluated in the complete formulation.
Hydroxyethyl Starch should be dispersed and hydrated according to the technical instructions for the selected grade. The final viscosity depends on concentration, molecular weight, degree of substitution, processing conditions and the presence of other formulation ingredients.
Hydroxyethyl Starches are characterized by Mw, MS and C2/C6 ratio, so these parameters should be specified when describing a particular grade rather than treating all Hydroxyethyl Starch products as technically identical.
For pharmacopoeial Hydroxyethyl Starches, the European Pharmacopoeia describes a general pH range of 4.5–7.0 for the applicable test solution. This value belongs to the pharmacopoeial monograph and should not automatically be treated as a universal specification for every cosmetic-grade commercial material.
Hydroxyethyl Starch can be used in:
Hydroxyethyl Starch is a modified, nonionic starch derivative in which hydroxyethyl groups are introduced into the starch polymer.
Hydroxyethyl Starch can be used for viscosity modification, thickening, texture modification and film-forming functions in suitable formulation systems.
It is derived from starch but is chemically modified by introducing hydroxyethyl groups. Pharmacopoeial sources describe it as a partially substituted poly(2-hydroxyethyl) ether of waxy maize starch or potato starch.
The commonly assigned CAS number is 9005-27-0. PubChem and the European Pharmacopoeia identify Hydroxyethyl Starch/Hydroxyethyl Starches with CAS 9005-27-0.
Yes. Hydroxyethyl Starch is a chemically modified starch polymer.
Important parameters include mean molecular weight (Mw), molar substitution (MS) and C2/C6 substitution ratio. These parameters influence the characteristics and performance of different Hydroxyethyl Starch grades.
Hydroxyethyl Starch grades can hydrate and dissolve or disperse in aqueous systems depending on their molecular characteristics and processing conditions. The exact solubility should be confirmed from the specification of the selected commercial grade.
A database representation gives C₂₂H₄₄O₁₇, but this represents a defined molecular structure used in chemical databases. Hydroxyethyl Starch itself is a polymeric material whose actual composition varies with substitution and molecular-weight characteristics.
Hydroxyethyl Starch is recognized in cosmetic ingredient databases and is associated with functions including thickening. The suitability of a particular grade depends on its specification and intended application.
| Parameter | Specification |
|---|---|
| Appearance | Creamy white to pale yellow |