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Polyglyceryl Polyricinoleate (PGPR): The Flow Master
Polyglyceryl Polyricinoleate (PGPR) is a specialized emulsifier derived from castor oil and glycerin, essential in modern food technology. Its primary selling point is viscosity reduction. In chocolate manufacturing, it dramatically lowers the "yield value," allowing thick mixtures to flow smoothly. This enables thinner coatings and reduces the need for expensive cocoa butter, saving costs while maintaining quality.
As a powerful Water-in-Oil (W/O) emulsifier, PGPR creates stable blends in high-fat products like margarine and dressings, preventing separation. It also improves the texture of ice cream coatings, ensuring they adhere smoothly without cracking. With excellent heat stability, it performs reliably during high-temperature processing, making it a versatile tool for creating consistent, high-quality food textures.
Items | Specifications | Results |
Appearance（25℃） | viscous liquid | viscous liquid |
Colour | Light yellow, yellow to brown | Yellow |
Acid Value(mgKOH/g） | ≤6.0 | 0.3 |
Saponification Value(mgKOH/g） | 160-190 | 188 |
(pb)Lead Value(mgKOH/g） | ≤2.0 | Not detected |
Iodine Value(g/100g) | 75-95 | 85 |
Mass spectrum | No ion peaks with differences of 44,58 or their integer multiples appear | Complies |
Conclusion | The product conforms to the above specifications. | |
Polyglyceryl Polyricinoleate (PGPR) is a specialized emulsifier and rheology modifier used primarily in food and industrial applications.
It is a complex ester synthesized from polyglycerol (derived from glycerin) and polyricinoleic acid (derived from castor oil). In simple terms, it acts as a "molecular bridge" that allows oil and water to mix, but its most powerful function is reducing viscosity in fat-based systems.
Here are the specific selling points and characteristics that make it valuable, particularly in food technology:
Key Selling Points
1. Superior Viscosity Reduction (The "Flow" Agent)
This is PGPR's most famous selling point, especially in the chocolate industry. It dramatically lowers the yield value (resistance to flow) of chocolate and cocoa products.
Benefit: It makes thick chocolate mixtures flow more easily, allowing for thinner, more uniform coatings on candies or biscuits.
Efficiency: It allows manufacturers to reduce the amount of expensive cocoa butter needed while maintaining the same flow properties.
2. Excellent Emulsification (Water-in-Oil)
PGPR is a classic Water-in-Oil (W/O) emulsifier. It has a low HLB value (approx. 1-2.5), meaning it loves oil more than water.
Benefit: It creates very stable emulsions in high-fat products like margarine, spreads, and salad dressings, preventing the water phase from separating out.
3. Improved Mold Release & Texture
In chocolate molding, PGPR helps air bubbles escape the mixture quickly.
Benefit: This results in a smooth, glossy finish without "pinholes" or air pockets. It also prevents "chocolate bloom" (white discoloration) and improves the adhesion of coatings to ice cream (preventing the coating from cracking or falling off).
4. Heat Stability
PGPR is highly stable at high temperatures (up to 90°C and above).
Benefit: It maintains its performance during high-heat processing like baking or frying, unlike some other emulsifiers that might degrade.
Technical Snapshot
Here is a quick breakdown of its physical properties and usage:
Property Specification / Value
Appearance Viscous, amber/brownish liquid
Solubility Soluble in oils/fats; Insoluble in water/ethanol
CAS Number 29894-35-7 (General) / 107615-51-0 (Specific variants)
HLB Value ~1 - 2.5 (Lipophilic/Oil-loving)
Regulatory Status Approved in GB 2760 (China), FDA (USA), EU
Common Applications
Because of these selling points, you will typically find this ingredient in:
Chocolate & Confectionery: To reduce viscosity, save cocoa butter costs, and ensure smooth molding.
Spreads & Margarines: To stabilize the water-in-oil emulsion and prevent splattering.
Ice Cream Coatings: To ensure the chocolate shell adheres well to the ice cream without cracking.
Meat Products: To improve texture and water retention in sausages.
Storage Note: It should be stored in a cool, dry place. It has a long shelf life (typically 24 months) and remains pumpable at room temperature.
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