Abstract
In this study, spherical alginate beads containing pyranine (P y ) as a fluorescence probe were prepared by ionotropic gelation of a sodium alginate solution. The steady state fluorescence technique was used to study pyranine release from the alginate beads crosslinked with calcium, barium and aluminum ions, respectively. The slow release of P y was observed with the time drive mode of the spectrophotometer at 512 nm. Fluorescence emission intensity (I p ) from P y was monitored during the release process, and the encapsulation efficiency (EE) of pyranine from the alginate beads was calculated. The Fickian Diffusion model was used to measure the release coefficients, D sl . It was seen that the slow release coefficients of pyranine from the alginate beads crosslinked with Ca2+, Ba2+, and Al3+ ions increased in the following order: D sl (Al3+)> D sl (Ca2+)> D sl (Ba2+). In contrast, the initial amount of pyranine and EE into the beads showed the reverse behavior.
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Experiments were carried out at the Spectroscopy Laboratory of the Department of Molecular Biology and at the Capillary Electrophoresis Laboratory of the Department of Chemistry at Istanbul Technical University.
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Kaygusuz, H., Erim, F.B., Pekcan, Ö. et al. Cation Effect on Slow Release from Alginate Beads: A Fluorescence Study. J Fluoresc 24, 161–167 (2014). https://doi.org/10.1007/s10895-013-1282-y
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DOI: https://doi.org/10.1007/s10895-013-1282-y