Monolinolein, also known as 1-monolinolein (glycerol monolinoleate), is a polyunsaturated monoglyceride obtained by esterification of glycerol with linoleic acid. It is valued for its emulsifying capacity and its emerging bioactive properties, making it relevant in pharmaceutical, biochemical, and formulation research.
Chemical Structure
Monolinolein has the molecular formula C21H38O4 and a molecular weight of approximately 354.5 g/mol. Its structure consists of a glycerol backbone esterified at the sn-1 position with a linoleoyl chain (18:2, 9Z,12Z). This unsaturated acyl chain confers a conical molecular geometry, which favors the formation of inverse non-lamellar lipid phases and contributes to its unique self-assembly and interfacial properties.
Physical Properties
The compound appears as a colorless to pale yellow liquid under standard conditions, with a melting point of approximately 14–15 °C, a density of about 0.981 g/cm³, and a boiling point near 485 °C. Monolinolein is sensitive to light and elevated temperatures, exhibits low solubility in water, and displays surfactant behavior that enables stabilization of oil-in-water emulsions in complex formulations.
Biological Role
Monolinolein is considered a plant-derived metabolite and has been investigated for potential antiviral activity. Through its linoleic acid moiety, it contributes to the supply of essential fatty acids involved in maintaining membrane fluidity and serving as precursors for eicosanoid synthesis in lipid-mediated signaling pathways. Additionally, it demonstrates moderate radical-scavenging activity, linking it functionally to oxidative stress modulation and lipid metabolism.