Abstract
We report on the synthesis of microcapsules (MCs) containing self-assembled nanoparticles formed from poly[diallylammonium chloride-co-(sulfur dioxide)] in the presence of citrate and silica sol nanoparticles. The MCs are spherical, and SEM and optical microscopy reveal them to have micrometer size. The fluorescent probe curcumin was encapsulated in the MCs and found to be located in the shell. The fluorescence of curcumin in the MCs is altered depending on their microenvironment. Effects of pH and ammonia on the fluorescence of curcumin in the MCs also were studied. The brightness of the probe in the MCs increases on addition of DNA. The effect was used to determine DNA from fish sperm by fluorometry. The association constant (K) is 4 000 mL.g−1, and the number of binding sites is ~1.0.
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Financial support provided by American University of Beirut, Lebanon and Lebanese National Council of Scientific Research (LNCSR), Lebanon to carry out this work is greatly acknowledged.
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Patra, D., Aridi, R. & Bouhadir, K. Fluorometric sensing of DNA using curcumin encapsulated in nanoparticle-assembled microcapsules prepared from poly(diallylammonium chloride-co-sulfur dioxide). Microchim Acta 180, 59–64 (2013). https://doi.org/10.1007/s00604-012-0903-5
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DOI: https://doi.org/10.1007/s00604-012-0903-5