Is commercial Glyceryl Monooleate a single pure monoester?

Usually not. Commercial Glyceryl Monooleate may contain mono-, di- and triglycerides, positional isomers, free glycerol and free fatty acid. The required material should therefore be defined by composition and agreed analytical limits, rather than assumed to be a single 99% substance from its product name.

Which controls are relevant when qualifying a Glyceryl Monooleate grade?

Confirm monoester content or total glycerides as applicable, free glycerol, acid value, water, colour and the required physical form, together with test methods. The acceptance specification should be based on the intended application; a product label or CAS number alone does not establish functional equivalence.

Glyceryl Monooleate (GMO) CAS 111-03-5

Glyceryl Monooleate (GMO, CAS 111-03-5, EC 203-827-7) is the commercial name used for glycerol monooleate materials. The reference 1-monoolein component has the molecular formula C21H40O4, but commercial GMO can contain mono-, di- and triglycerides, positional isomers, free glycerol and free fatty acid. The defined triglyceride Glycerol Trioleate (Triolein) is a related but chemically distinct oleate ester. It is evaluated as an emulsifier, lubricant, dispersing or release aid in personal-care, food, polymer and industrial formulations only when the offered grade supports the intended standard. Confirm monoester content, glyceride distribution, acid, saponification, iodine and hydroxyl values, water, color, form, packaging and documents.

CAS: 111-03-5
Synonyms: Glycerol monooleate; Glyceryl oleate; 1-Monoolein; Glycerol 1-monooleate; 1-Oleoyl-rac-glycerol
Einecs: 203-827-7
Molecular Formula: C₂₁H₄₀O₄ (nominal 1-monoolein; commercial GMO is a glyceride mixture)
Grade: Confirm monoester content, glyceride distribution, free glycerol, acid, saponification, iodine and hydroxyl values, water and color
Package: Confirm current packaging, net weight, storage conditions and destination requirements for the selected grade

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Product Description

1 Product overview

2 Technical information

3 Handling and documentation

Product overview

Glyceryl Monooleate (GMO, CAS 111-03-5, EC 203-827-7) is an oleic-acid ester of glycerol used as a nonionic, lipophilic emulsifier, co-emulsifier, lubricant, antistatic aid and dispersion auxiliary. Formula C₂₁H₄₀O₄ applies to the defined 1-monoolein molecule. Commercial GMO, however, is normally a composition-controlled glyceride product that can include mono-, di- and triglycerides, positional isomers, free glycerol and free fatty acid; it should not automatically be sold as a 99% single substance. Specify monoester content, total glycerides, acid value, saponification value, iodine value, hydroxyl value, water and physical form on the COA. GMO can be a viscous liquid, paste or semi-solid depending on composition and temperature. It is distinct from triolein, the glycerol triester of oleic acid (CAS 122-32-7). For food, cosmetic or pharmaceutical use, select a grade supported by the relevant monograph and compliance documents rather than relying on the CAS number alone.

Technical information

Product	Glyceryl Monooleate (GMO) CAS 111-03-5
CAS number	111-03-5
EC / list number	203-827-7
Molecular formula / identity	C₂₁H₄₀O₄ (nominal 1-monoolein; commercial GMO is a glyceride mixture)
Synonyms	Glycerol monooleate; Glyceryl oleate; 1-Monoolein; Glycerol 1-monooleate; 1-Oleoyl-rac-glycerol
Grade	Industrial/formulation grade; composition controlled by monoester and analytical specification, not a generic 99% purity claim
Packaging	Confirm current packaging, net weight, storage conditions and destination requirements for the selected grade

Handling and documentation

Specifications may vary by grade and batch. Confirm the current TDS, COA and SDS before purchase or use. Store and handle the product in accordance with the SDS and applicable site procedures.

FAQ - Technical & Supply Chain

Q:
Is commercial Glyceryl Monooleate a single pure monoester?

A: Usually not. Commercial Glyceryl Monooleate may contain mono-, di- and triglycerides, positional isomers, free glycerol and free fatty acid. The required material should therefore be defined by composition and agreed analytical limits, rather than assumed to be a single 99% substance from its product name.
Q:
Which controls are relevant when qualifying a Glyceryl Monooleate grade?

A: Confirm monoester content or total glycerides as applicable, free glycerol, acid value, water, colour and the required physical form, together with test methods. The acceptance specification should be based on the intended application; a product label or CAS number alone does not establish functional equivalence.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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