Propylene glycol alginate

Propylene glycol alginate (CAS 9005-37-2), abbreviated PGA and approved as E405, is a modified alginate ester derived from alginic acid.

Where is Propylene glycol alginate used?

• Food and beverage: stabilises salad dressings, sauces and acidic beverages by preventing phase separation
• Brewing: improves and sustains foam head stability in beer
• Pharmaceuticals: liquid oral dosage forms and topical gels needing controlled rheology and acid tolerance
• Personal care: thickener and film-former in lotions and hair care products at lower pH
• Unlike standard alginates, it remains stable and functional in acidic conditions.

Good to know: Unlike standard alginates, it remains stable and functional in acidic conditions. The degree of esterification varies by grade and affects acid stability and emulsification performance; buyers should confirm it against their application.

Commercial specifications

• Cream to white powder in varying particle sizes
• Food-grade (FCC compliant) and pharmaceutical-grade meeting USP or Ph. Eur. specifications
• Degree of esterification varies by grade