Improving water dispersibility and bioavailability of luteolin using microemulsion system

Area of Science:

• Pharmacology
• Biochemistry
• Drug Delivery Systems

Background:

• Luteolin, a flavonoid, has known health benefits but suffers from poor water solubility, limiting its bioavailability.
• Microemulsion systems show promise for improving the absorption of poorly soluble compounds.

Purpose of the Study:

• To evaluate the oral absorption and metabolic profile of luteolin delivered via a microemulsion system.
• To compare the bioavailability of luteolin in microemulsion (WD-L) versus conventional form (CO-L).

Main Methods:

• Preparation of water-dispersed luteolin (WD-L) using a microemulsion system.
• Oral administration of WD-L and CO-L to rats.
• Analysis of luteolin and its metabolites in plasma using pharmacokinetic methods.

Main Results:

• WD-L exhibited superior water dispersibility compared to CO-L.
• The primary metabolite in plasma for both groups was luteolin-3'-O-β-glucuronide.
• The plasma area under the curve (AUC) for luteolin-3'-O-β-glucuronide was 2.2-fold higher in the WD-L group.

Conclusions:

• Microemulsion delivery significantly improves the oral bioavailability of luteolin.
• The metabolic profile of luteolin remains consistent regardless of the delivery system.
• Microemulsion systems offer a viable strategy for optimizing luteolin delivery.