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Nanocrystallization and Microencapsulation of Natural Pigments for Improved Dissolution and Stability
Zhitao Cai1, Hanyan Gong1, Sishu Li1
1School of Pharmacy, Shenyang Pharmaceutical University, Shenhe District, No. 103 Wenhua Road, Wulihe Subdistrict, 110016, Shenyang, Liaoning, People's Republic of China.
AAPS Pharmscitech
|January 29, 2026
Summary
A novel nanosuspension-microencapsulation system significantly improves the dissolution, stability, and processing of natural lipophilic pigments like curcumin and lutein for pharmaceutical use.
Area of Science:
- Pharmaceutical Sciences
- Materials Science
- Nanotechnology
Background:
- Natural lipophilic pigments (e.g., curcumin, lutein) have poor water solubility, low dissolution rates, and photothermal instability, limiting their pharmaceutical applications.
- Developing effective delivery systems is crucial for enhancing the bioavailability and stability of these valuable compounds.
Purpose of the Study:
- To develop and optimize a nanosuspension-microencapsulation delivery system for natural lipophilic pigments.
- To enhance the dissolution, stability, and powder properties of curcumin and lutein for pharmaceutical formulation.
Main Methods:
- Nanosuspensions (NS) of curcumin (CUR) and lutein (LUT) were prepared using antisolvent precipitation and optimized with wet media milling, using Hydroxypropyl methylcellulose E5 (HPMC-E5) as a stabilizer.
- Nanosuspensions were converted into microcapsules via spray drying and fluidized bed coating with sucrose-based cores.
- Surface modification and powder properties (flowability, compressibility) were evaluated.
Main Results:
- Curcumin-NS and lutein-NS showed significantly enhanced dissolution rates compared to raw pigments (CUR-NS: 93.3% in 5 min; LUT-NS: 85.1% in 120 min).
- Microencapsulation via fluidized bed coating yielded microcapsules with excellent flowability (angle of repose ~20°) and direct compression suitability.
- Accelerated stability tests demonstrated 1.3- to fourfold improvements in resistance to heat, light, and humidity for microcapsules compared to raw pigments.
Conclusions:
- The developed nanosuspension-microencapsulation strategy effectively enhances the dissolution, stability, and processing performance of poorly soluble natural pigments.
- This approach shows significant promise for industrial formulation and application of natural pigments in pharmaceuticals.
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