Development and characterization of photo-responsive cinnamoly modified alginate

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Drug Delivery Systems

Background:

• Alginate is a versatile polysaccharide for biomaterial development.
• Photo-crosslinkable hydrogels offer tunable properties for advanced applications.
• Controlled drug release remains a key challenge in pharmaceutical science.

Purpose of the Study:

• To synthesize and characterize a novel photo-crosslinkable hydrogel based on cinnamoyl-modified alginate (Alg-CN).
• To evaluate the potential of the Alg-CN hydrogel as an efficient drug carrier for paracetamol.
• To investigate the influence of UV light exposure on hydrogel cross-linking and drug release kinetics.

Main Methods:

• Alginic acid was modified via methyl ester and hydrazide intermediates.
• Cinnamoyl chloride was used to functionalize alginate, forming Alg-CN.
• Synthesized derivatives were characterized using spectral and instrumental techniques.
• Photo-crosslinking was achieved via UV-induced [2π+2π] cycloaddition of cinnamoyl moieties.
• Drug release studies were conducted by monitoring paracetamol diffusion from the hydrogel.

Main Results:

• Successful synthesis and characterization of cinnamoyl-modified alginate (Alg-CN).
• Demonstrated initiator-free photo-crosslinking of Alg-CN upon UV exposure, forming cyclobutane bridges.
• UV-induced cross-linking was confirmed by changes in UV spectra and gelation.
• The developed hydrogel exhibited tunable swelling behavior with UV exposure time.
• Controlled release of paracetamol was achieved, modulated by the degree of cross-linking.

Conclusions:

• Cinnamoyl-modified alginate (Alg-CN) forms efficient photo-crosslinkable hydrogels.
• The Alg-CN hydrogel system provides a promising platform for controlled drug delivery.
• Tunable cross-linking via UV light allows for precise control over drug release rates.