Dual-Mechanism Gastroretentive Tablets with Encapsulated Gentian Root Extract

Area of Science:

• Pharmaceutical Technology
• Drug Delivery Systems
• Natural Product Chemistry

Background:

• Gentian (Gentiana lutea) root extract contains gentiopicroside, a bioactive compound with systemic effects but poor bioavailability and short half-life.
• Developing gastroretentive systems aims to enhance gentiopicroside's therapeutic efficacy through improved absorption and prolonged action.

Purpose of the Study:

• To formulate and characterize mucoadhesive-floating gastroretentive tablets encapsulating gentian root extract.
• To optimize the formulation for enhanced gentiopicroside bioavailability and local gastric action.

Main Methods:

• Solid lipid microparticles containing gentian root extract were prepared using lyophilized double emulsions.
• Tablets were produced by direct compression using sodium bicarbonate and microparticles.
• Quality by Design (QbD) principles were applied to assess critical formulation and process parameters.

Main Results:

• Trehalose content and high-shear-homogenization time were identified as critical factors influencing formulation properties.
• The optimized formulation achieved high gentiopicroside encapsulation efficiency (95.13%), good stability, and flowability.
• Developed tablets demonstrated adequate mucoadhesion, floating lag time (275s), and biphasic gentiopicroside release, remaining stable for 18 months.

Conclusions:

• Successfully developed dual-mechanism gastroretentive tablets for gentian root extract delivery.
• The formulation resists gastric enzymes, ensuring drug release in the small intestine, even with rapid gastric emptying.