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Stable environmentally sensitive cationic hydrogels for controlled delivery applications.

Namita Deo¹, S Ruetsch, K R Ramaprasad

¹TRI/Princeton, 601 Prospect Avenue, P. O. Box 625, Princeton, NJ 08542, USA. ndeo@triprinceton.com

Journal of Cosmetic Science

|January 19, 2011

Summary

New cationic hydrogels synthesized from N-isopropylacrylamide (NIPAM) and (3-acrylamidopropyl)trimethylammonium chloride (AAPTAC) show enhanced stability and tunable properties. These thermosensitive materials offer potential in drug delivery and environmental remediation.

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Area of Science:

Materials Science
Polymer Chemistry
Biomaterials

Background:

Thermosensitive hydrogels are crucial for controlled release applications.
Cationic hydrogels often suffer from limited pH stability.
Developing stable, responsive hydrogels is an ongoing challenge.

Purpose of the Study:

To synthesize novel thermosensitive, cationic hydrogels with enhanced colloidal stability.
To investigate the influence of a new cationic comonomer on hydrogel properties.
To explore the potential applications of these hydrogels in drug delivery and environmental remediation.

Main Methods:

Dispersion copolymerization of N-isopropylacrylamide (NIPAM) and (3-acrylamidopropyl)trimethylammonium chloride (AAPTAC).
Characterization of hydrogel particle size, colloidal stability, and hydrophobicity/hydrophilicity.
Utilized pyrene fluorescence spectroscopy for hydrophobicity analysis.

Main Results:

Synthesized stable poly(NIPAM-co-AAPTAC) hydrogels with a broad pH stability range (1.5-11.0).
Demonstrated significant sensitivity to temperature, pH, and salt concentration, with particle size decreasing with increased temperature and salt.
Hydrophobicity/hydrophilicity was effectively controlled by pH and temperature.

Conclusions:

The novel cationic comonomer significantly enhances hydrogel stability across a wide pH range.
These thermosensitive hydrogels exhibit tunable properties suitable for controlled active delivery in cosmetic and medical fields.
Potential applications include scavenging environmental toxins and developing advanced drug delivery systems.