Formulation of polyphthalaldehyde microcapsules for immediate UV-light triggered release.

Area of Science:

• Materials Science
• Polymer Chemistry
• Drug Delivery

Background:

• Responsive drug reservoirs activated by remote stimuli are crucial for various applications.
• Key challenges include cost-efficient formulation, industrial scalability, and achieving immediate, rather than continuous, release upon activation.

Purpose of the Study:

• To develop UV-sensitive microcapsules capable of immediate triggered release.
• To investigate polyphthalaldehyde-based microcapsules using internal phase separation and explore their morphology and release kinetics.

Main Methods:

• Preparation of polyphthalaldehyde-based microcapsules via internal phase separation.
• Development of a fluorescence microscopy method for in-situ study of microcapsule morphology and triggered release.
• Evaluation of microcapsule sensitivity to acid and UV triggers.

Main Results:

• A core-shell morphology was achieved through slow emulsion-to-suspension transformation, contrasting with previous findings.
• Poly(methacrylic acid)-stabilized microcapsules exhibited immediate UV-triggered release.
• Microcapsules released core content within one minute of UV light exposure in both aqueous and dry environments.

Conclusions:

• UV-sensitive polyphthalaldehyde microcapsules with thin shells and weak spots enable immediate triggered release.
• The formulation is cost-efficient and suitable for industrial scale-up.
• The developed microcapsules represent a significant advancement in stimuli-responsive drug delivery systems.