Simple Approach to Enhance Green Tea Epigallocatechin Gallate Stability in Aqueous Solutions and Bioavailability:...

Area of Science:

• Nutritional Science
• Pharmaceutical Chemistry
• Biochemistry

Background:

• Epigallocatechin gallate (EGCG), a key green tea polyphenol, possesses significant antioxidant and anti-infectious properties.
• Low bioavailability and instability hinder EGCG's clinical application, despite extensive research into delivery systems like nanotechnology.
• Existing methods for improving EGCG stability and bioavailability have faced challenges in industrial scalability.

Purpose of the Study:

• To develop a simple, stable, and bioavailable aqueous EGCG formulation for clinical trials.
• To address challenges in EGCG delivery systems for large-scale administration, particularly for patients with swallowing difficulties.

Main Methods:

• Development of a simple aqueous EGCG solution.
• Comprehensive characterization using HPLC-UV-mass spectrometry, infrared spectroscopy, and density functional theory.
• Stability testing according to ICH guidelines and bioavailability assessment in rats.

Main Results:

• An EGCG-sucrose complex unexpectedly enhanced EGCG stability in aqueous media.
• The formulated solution demonstrated stability for at least 24 months at 2-8 °C and ambient temperatures.
• Significant improvement in oral bioavailability in rats compared to EGCG powder in hard-gel capsules.

Conclusions:

• The developed aqueous EGCG formulation offers a simple and stable platform for EGCG administration.
• This formulation shows potential for overcoming bioavailability limitations and facilitating clinical development of EGCG.
• The EGCG-sucrose complex presents a promising strategy for stabilizing EGCG in aqueous solutions.