Advances In 3D-Printed Ultraviolet Light Responsive Hydrogels In Drug Release - A Mini Review
DOI:
https://doi.org/10.15282/Keywords:
UV Light Responsive Hydrogel, Photoresponsive Hydrogel , Characterization Techniques , Stimuli/StimulusAbstract
This review digs into how ultraviolet (UV) light-responsive hydrogels, paired with cutting-edge 3D and 4D printing, enable personalized drug delivery. These hydrogels can absorb UV light and shift the structure, so that the hydrogels can release the drug straight to the target site. Photochromic compounds like azobenzene, spiropyran, and spirooxazine give the function of absorbing UV light to activate the release mechanism of the drugs to the target area. These molecules flip back and forth in response to UV light, letting the hydrogel swell, change its pores, and control the movement of drugs through it. Basically, the hydrogel becomes a programmable carrier. By using 3D and 4D printing, these hydrogels can be built with various precision, containing tiny channels, built-in drug reservoirs, and complex, layered shapes. The review lines up UV-responsive hydrogels against traditional drug delivery systems and shows how these hydrogels are better at releasing drugs on demand, limiting exposure to the rest of the body, and cutting down on side effects. To understand on how these hydrogels work, the review also discussing a few tests of the hydrogels: FTIR, UV-Vis spectroscopy, SEM, and rheology. These tests show whether the hydrogels hold up physically, stay chemically stable, and actually respond to UV light according to the wavelength and area of the hydrogel exposed to the UV light. As for the disadvantages affected the hydrogels performance towards manufacturing process—cost, environmental impact, how to scale up production, and whether these materials stay safe in the body for a long term. The review looks at how researchers are tackling these problems, from suggestion of the materials themselves, to mixing in hybrid polymers, to adding nanoparticles for extra responsiveness. The paper points to new frontiers: hydrogels that respond to visible or near-infrared light, platforms that respond to more than one trigger, and smart 4D-printed patches that adapt to patients in real time. Overall, UV-responsive, 3D-printed hydrogels are shaping up to be a big leap forward for safer, smarter, and more sustainable healthcare.
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