Multi-fluorescent silica colloids for encoding large combinatorial libraries

Matthews, D. C., Grondahl, L., Battersby, B. J. and Trau, M. (2001) Multi-fluorescent silica colloids for encoding large combinatorial libraries. Australian Journal of Chemistry, 54 9-10: 649-656. doi:10.1071/CH01120


Author Matthews, D. C.
Grondahl, L.
Battersby, B. J.
Trau, M.
Title Multi-fluorescent silica colloids for encoding large combinatorial libraries
Journal name Australian Journal of Chemistry   Check publisher's open access policy
ISSN 0004-9425
Publication date 2001
Sub-type Article (original research)
DOI 10.1071/CH01120
Volume 54
Issue 9-10
Start page 649
End page 656
Total pages 8
Place of publication Australia
Publisher CSIRO Publishing
Collection year 2001
Language eng
Subject C1
250103 Colloid and Surface Chemistry
270800 Biotechnology
780103 Chemical sciences
0306 Physical Chemistry (incl. Structural)
Abstract Large chemical libraries can be synthesized on solid-support beads by the combinatorial split-and-mix method. A major challenge associated with this type of library synthesis is distinguishing between the beads and their attached compounds. A new method of encoding these solid-support beads, 'colloidal bar-coding', involves attaching fluorescent silica colloids ('reporters') to the beads as they pass through the compound synthesis, thereby creating a fluorescent bar code on each bead. In order to obtain sufficient reporter varieties to bar code extremely large libraries, many of the reporters must contain multiple fluorescent dyes. We describe here the synthesis and spectroscopic analysis of various mono- and multi-fluorescent silica particles for this purpose. It was found that by increasing the amount of a single dye introduced into the particle reaction mixture, mono- fluorescent silica particles of increasing intensities could be prepared. This increase was highly reproducible and was observed for six different fluorescent dyes. Multi-fluorescent silica particles containing up to six fluorescent dyes were also prepared. The resultant emission intensity of each dye in the multi-fluorescent particles was found to be dependent upon a number of factors; the hydrolysis rate of each silane-dye conjugate, the magnitude of the inherent emission intensity of each dye within the silica matrix, and energy transfer effects between dyes. We show that by varying the relative concentration of each silane-dye conjugate in the synthesis of multi-fluorescent particles, it is possible to change and optimize the resultant emission intensity of each dye to enable viewing in a fluorescence detection instrument.
Keyword Chemistry, Multidisciplinary
Monodisperse
Spheres
Dispersions
Particles
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemistry and Molecular Biosciences
 
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Created: Tue, 14 Aug 2007, 15:56:25 EST