What is Propylene Glycol Alginate CAS 9005-37-2?

Propylene Glycol Alginate, commonly abbreviated as PGA and listed as E405, is the propylene glycol ester of alginic acid. It is supplied as a white to light-yellow powder and is used as an acid-tolerant thickener, stabilizer, and emulsifier in food, pharmaceutical, and cosmetic formulations.

How should formulators choose the viscosity and use level of Propylene Glycol Alginate?

The typical 1% solution viscosity range is about 20-500 mPa.s, and the normal use level is around 0.2-0.7% by weight depending on the target texture and acid content. Lower-viscosity grades generally suit beverages and high-shear systems, while higher-viscosity grades provide more body in sauces, dressings, and dairy products.

What are the main applications of Propylene Glycol Alginate E405?

In food, PGA is used in acidic beverages, beer foam stabilization, salad dressings, sauces, and frozen dairy. It also acts as a controlled-release binder or film former in pharmaceuticals and as an acid-tolerant stabilizer in creams and lotions.

Propylene Glycol Alginate (PGA) CAS 9005-37-2

Propylene Glycol Alginate, commonly abbreviated as PGA and listed as E405, CAS 9005-37-2, is the propylene glycol ester of alginic acid supplied as an acid-tolerant thickener, stabilizer and emulsifier. Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 9005-37-2
Synonyms: PGA, Hydroxypropyl alginate, Propylene glycol ester of alginic acid, 1,2-Propanediol alginate, Alginic acid, ester with 1,2-propanediol, E405
Einecs: 618-414-0
Molecular Formula: (C₉H₁₄O₇)ₙ
Grade: Food Grade / Pharmaceutical Grade
Package: 25kg/drum or 25kg/kraft bag

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Product Description

Propylene Glycol Alginate (PGA) CAS 9005-37-2 is the propylene glycol ester of alginic acid, also known as hydroxypropyl alginate, with the repeat-unit formula (C₉H₁₄O₇)ₙ and EINECS 618-414-0.

Synonyms: PGA; Hydroxypropyl alginate; Propylene glycol ester of alginic acid; 1,2-Propanediol alginate; Alginic acid, ester with 1,2-propanediol; E405.

CAS: 9005-37-2.

Molecular formula: (C₉H₁₄O₇)ₙ.

It is supplied as a white to light-yellow powder.

It is used as an acid-tolerant thickener, stabilizer and emulsifier in food, pharmaceutical and cosmetic formulations.

Unlike sodium alginate, PGA remains functional in low-pH systems such as fruit drinks, yogurt beverages and beer.

This acid stability allows PGA to suspend pulp, stabilize emulsions and improve beer foam.

It is used in acidic beverages, beer foam stabilization, salad dressings, sauces and frozen dairy.

The typical 1% solution viscosity is about 20-500 mPa·s, with a normal use level of about 0.2-0.7% by weight.

The degree of esterification is typically 80.0% or higher, with alginic acid purity about 40.0-45.0%.

It also acts as a controlled-release binder or film former in pharmaceuticals and as an acid-tolerant stabilizer in creams and lotions.

Store in a cool, dry, dark environment; it is sensitive to heat and moisture, with prolonged exposure above 25 °C reducing viscosity.

Protect from heat and moisture, and keep containers hermetically sealed when not in use.

Confirm appearance, degree of esterification, purity, viscosity, loss on drying, ash content and grade as required.

Use suitable eye and skin protection during handling, and wash skin contact with soap and water.

Confirm packaging with the requested quantity and destination requirements.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended application, required grade, viscosity, quantity, packaging, destination and document needs.

FAQ - Technical & Supply Chain

Q:
What is Propylene Glycol Alginate CAS 9005-37-2?

A: Propylene Glycol Alginate, commonly abbreviated as PGA and listed as E405, is the propylene glycol ester of alginic acid. It is supplied as a white to light-yellow powder and is used as an acid-tolerant thickener, stabilizer, and emulsifier in food, pharmaceutical, and cosmetic formulations.
Q:
Why is PGA preferred over sodium alginate in acidic beverages?

A: Sodium alginate tends to gel or precipitate below about pH 4, while PGA remains functional in low-pH systems such as fruit drinks, yogurt beverages, and beer. This acid stability allows PGA to suspend pulp, stabilize emulsions, and improve beer foam without reacting prematurely.
Q:
How should formulators choose the viscosity and use level of Propylene Glycol Alginate?

A: The typical 1% solution viscosity range is about 20-500 mPa.s, and the normal use level is around 0.2-0.7% by weight depending on the target texture and acid content. Lower-viscosity grades generally suit beverages and high-shear systems, while higher-viscosity grades provide more body in sauces, dressings, and dairy products.
Q:
What are the main applications of Propylene Glycol Alginate E405?

A: In food, PGA is used in acidic beverages, beer foam stabilization, salad dressings, sauces, and frozen dairy. It also acts as a controlled-release binder or film former in pharmaceuticals and as an acid-tolerant stabilizer in creams and lotions.

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