Light-responsive polymer microcapsules as delivery systems for natural active agents
- Institute for Polymers, Composites and Biomaterials (IPCB-CNR), Via Campi Flegrei, 34, 80078 Pozzuoli, NA (Italy)
- Department of Chemical, Materials and Production Engineering (DICMAPI), University of Naples “Federico II”, P. le Tecchio, 80, 80125 Napoli (Italy)
In this work we report the preparation and the release behavior of UV-responsive polymeric microcapsules containing essential oils as a core. The oil acted also as a monomer solvent during polymerization. Accordingly, the potentially toxic organic solvent traditionally used was replaced with a natural active substance, resulting in a more sustainable functional system. Polymer shell was based on a lightly cross-linked polyamide containing UV-sensitive azobenzene moieties in the main chain. The micro-sized capsules were obtained via interfacial polycondensation in o/w emulsion, and their mean size was measured via Dynamic Light Scattering. Shape and morphology were analyzed through Scanning Electron and Optical Microscopy. UV-responsive behavior was evaluated via spectrofluorimetry, by assessing the release kinetics of a fluorescent probe molecule upon UV light irradiation (λ{sub max}=360 nm). The irradiated samples showed an increase in fluorescence intensity, in accordance with the increase of the probe molecule concentration in the release medium. As for the un-irradiated sample, no changes could be detected demonstrating the effectiveness of the obtained releasing system.
- OSTI ID:
- 22609160
- Journal Information:
- AIP Conference Proceedings, Vol. 1736, Issue 1; Conference: 8. international conference on times of polymers and composites: From aerospace to nanotechnology, Naples (Italy), 19-23 Jun 2016; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CAPSULES
CONCENTRATION RATIO
ECOLOGICAL CONCENTRATION
ELECTRON SCANNING
EMULSIONS
ESSENTIAL OILS
FLUORESCENCE
IRRADIATION
LIGHT SCATTERING
MONOMERS
OPTICAL MICROSCOPY
ORGANIC SOLVENTS
POLYAMIDES
POLYMERIZATION
TOXICITY
ULTRAVIOLET RADIATION
VISIBLE RADIATION