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Incorporation of low molecular weight biocides into polystyrene-divinyl benzene beads with controlled release characteristics.

Triclosan and phosphonium salt biocides have been separately incorporated into polystyrene-divinylbenzene (PS-DVB) beads by suspension polymerization. Ultraviolet (UV) absorption measurements have been used to monitor the release of these low molecular weight biocides out of the PS-DVB beads immersed in water-ethanol mixtures and in physiological saline. The release of the biocide agents is strongly dependent on either the DVB or/and the antimicrobial composition ratio in the beads. An increase of biocide incorporation in the PS/ DVB beads was accompanied by a corresponding enhancement of its concentration in liquid mixtures. On the contrary, higher cross-linking densities hindered the biocide migration out of the beads by diminishing its release rate into either the aqueous ethanol solutions or the natural serum. Moreover, Fourier transform Raman (FT-Raman) spectra and Attenuated Total Reflectance Infrared (ATR-FTIR) measurements of the PS-DVB-Triclosan and PS-DVB-phosphonium salt beads, before and after their immersion in water-ethanol solutions, gave a similar qualitative evidence of the biocide release.[1]

References

  1. Incorporation of low molecular weight biocides into polystyrene-divinyl benzene beads with controlled release characteristics. Iconomopoulou, S.M., Andreopoulou, A.K., Soto, A., Kallitsis, J.K., Voyiatzis, G.A. Journal of controlled release : official journal of the Controlled Release Society. (2005) [Pubmed]
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