Monodocosahexaenoin, also known as 1-monodocosahexaenoin or 1-DHA monoglyceride, is a highly polyunsaturated monoglyceride esterified from glycerol and docosahexaenoic acid (DHA, 22:6 n-3) at the sn-1 position. This ultra-long-chain omega-3 lipid is studied for its roles in neuroprotection, ferroptosis inhibition, and advanced lipid nanocarrier systems, extending structure–function trends observed for monoeicosapentaenoin and other polyunsaturated fatty acid (PUFA) monoglycerides.
Chemical Structure
Monodocosahexaenoin has the molecular formula C25H38O4 and a molecular weight of approximately 402.6 g/mol. Its glycerol backbone is esterified with all-cis-4,7,10,13,16,19-docosahexaenoic acid, containing six double bonds. This high degree of unsaturation confers pronounced molecular curvature, extreme conformational flexibility, and elevated susceptibility to lipid peroxidation, comparable to other highly unsaturated monoglycerides such as monolinolenin.
Physical Properties
The compound is typically obtained as a light-sensitive oil with a characteristic odor and a low density of approximately 0.94 g/cm³. It is practically insoluble in water but readily soluble in non-polar organic solvents such as chloroform. For long-term stability, storage at 2–8 °C or −20 °C under an inert atmosphere is recommended to minimize oxidative degradation. It is considered chemically neutral (near-neutral pH) and is not reported to present explosive or significant irritant hazards under standard laboratory handling conditions.
Biological Role
As a bioactive derivative of DHA, monodocosahexaenoin has been investigated for its ability to modulate ferroptosis by limiting oxidative lipid damage and iron-dependent cell death in experimental disease models. It may contribute to the maintenance of neuronal membrane fluidity and serve as a metabolic precursor for specialized pro-resolving mediators, including resolvins and neuroprotectins. Owing to its amphiphilic structure and high unsaturation level, it is also hypothesized to enhance antimicrobial membrane-disruptive activity relative to less unsaturated monoglyceride analogs.
