Spiral-Dextrin Complex Crystals: Efficient Approach for Colon-Targeted Resveratrol Delivery

Area of Science:

• Pharmaceutical Sciences
• Materials Science
• Drug Delivery Systems

Background:

• Resveratrol (Res) has therapeutic potential but poor gastrointestinal stability.
• Developing effective drug delivery systems is crucial for Res bioavailability.
• Colon-specific delivery can enhance Res therapeutic efficacy by bypassing upper GI degradation.

Purpose of the Study:

• To develop a novel colon-specific drug delivery system for resveratrol using spiral dextrin (SD).
• To compare the anti-digestion ability of a spiral dextrin/resveratrol (SD/Res) crystal with an SD/Res inclusion complex (SD/Res IC).
• To investigate the effect of SD chain length on the properties and performance of the SD/Res crystal.

Main Methods:

• Novel encapsulation and co-crystallization method to prepare SD/Res crystals.
• Preparation of SD/Res inclusion complexes (SD/Res IC) via encapsulation and co-precipitation.
• Characterization using X-ray diffraction (XRD) and scanning electron microscopy (SEM).
• In vitro digestion studies to assess gastrointestinal stability and targeted release.

Main Results:

• SD/Res crystals exhibited more regular crystallite structures than SD/Res ICs.
• Encapsulation ability and thermostability of SD/Res crystals increased with SD chain length.
• SD/Res ICs showed small intestine-targeted release, while SD/Res crystals provided colon-specific delivery.
• SD-1/Res crystal demonstrated superior thermal and gastrointestinal stability.

Conclusions:

• The novel SD/Res crystal system functions as an effective colon-specific drug delivery system.
• This system successfully protects resveratrol from degradation in the upper gastrointestinal tract.
• The SD-1/Res crystal is a promising candidate for enhanced resveratrol delivery to the colon.