Overview
Diglycerol stearate is a polyglycerol ester formed by the esterification of diglycerol with stearic acid. As a non-ionic surfactant, it serves primarily as an emulsifier and stabilizer in various industrial applications. The compound belongs to the broader class of polyglyceryl esters, which are valued for their multifunctional properties in formulation chemistry. In commercial production, diglycerol stearate is typically manufactured through controlled esterification processes under specific temperature and catalyst conditions. The resulting product demonstrates excellent compatibility with both oil and water phases, making it particularly useful in emulsion systems. Its amphiphilic nature allows it to reduce surface tension between immiscible substances.
Physical and Chemical Properties
As a waxy solid at room temperature, diglycerol stearate exhibits moderate thermal stability with a melting point range of 55-60°C. The compound shows characteristic ester group absorption bands in infrared spectroscopy around 1735 cm⁻¹. Its HLB (Hydrophile-Lipophile Balance) value typically falls between 3-6, indicating stronger lipophilic than hydrophilic tendencies. The ester demonstrates good oxidative stability due to its saturated fatty acid component (stearic acid). Unlike ionic surfactants, it maintains stability across a wide pH range (3-9) without hydrolysis concerns. Its solubility profile makes it particularly effective in oil-based systems, though it can facilitate water-in-oil emulsion formation when combined with other emulsifiers.
Main Applications
In cosmetics, diglycerol stearate functions as a key emulsifier in creams, lotions, and makeup products, providing stable textures and improved spreadability. The pharmaceutical industry utilizes it in ointment bases and topical drug delivery systems due to its skin compatibility and non-irritating properties. The food sector employs food-grade diglycerol stearate as an emulsifier in baked goods, whipped toppings, and confectionery products (E475 food additive). Industrial applications include its use in lubricant formulations and as a processing aid in plastic manufacturing. Recent developments explore its potential in nanoemulsion technology for enhanced bioactive compound delivery.
Safety and Storage
Regulatory agencies including FDA and EFSA approve diglycerol stearate for specific food and cosmetic applications within defined concentration limits. The material presents low acute toxicity (oral LD50 >2000 mg/kg in rats) and shows no evidence of skin sensitization in standard patch tests. Proper storage requires protection from moisture and temperatures exceeding 40°C to prevent lump formation. Bulk quantities should be stored in original sealed containers away from oxidizing agents. Industrial users should implement standard personal protective equipment (gloves, goggles) when handling powdered forms to prevent eye or respiratory irritation.
B2B Procurement Guide
Industrial buyers should specify required purity levels (typically 95-99%) and request certificates of analysis for each batch. Food and pharmaceutical applications demand USP/NF or FCC grade materials with appropriate documentation. Key quality indicators include acid value (<5 mg KOH/g), peroxide value (<10 meq/kg), and heavy metal content limits. Leading manufacturers are concentrated in Europe, North America, and Asia, with production capacities ranging from hundreds to thousands of metric tons annually. Minimum order quantities vary significantly between suppliers (100kg-1MT), with contract manufacturing options available for large-volume users. Sample testing is recommended to verify performance in specific formulations before bulk purchasing.
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