Application of Fluorescent Nanocrystals (q-dots) for the Detection of Pathogenic Bacteria by Flow-Cytometry |
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Authors: | Eran Zahavy Vered Heleg-Shabtai Yossi Zafrani Daniele Marciano and Shmuel Yitzhaki |
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Institution: | (1) Department of Infectious Diseases, Israel Institute for Biological Research, P.O. Box 19, Ness-Ziona, 74100, Israel;(2) Department of Physical Chemistry, Israel Institute for Biological Research, P.O. Box 19, Ness-Ziona, 74100, Israel;(3) Department of Organic Chemistry, Israel Institute for Biological Research, P.O. Box 19, Ness-Ziona, 74100, Israel |
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Abstract: | Fluorescent semiconductor nanocrystals (q-dots) benefit from practical features such as high fluorescence intensity, broad
excitation band and emission diameter dependency. These unique spectroscopic characterizations make q-dots excellent candidates
for new fluorescent labels in multi-chromatic analysis, such as Flow-Cytometry (FCM). In this work we shall present new possibilities
of multi-labeling and multiplex analysis of pathogenic bacteria, by Flow-Cytometry (FCM) analysis and new specific IgG—q-dots
conjugates. We have prepared specific conjugates against B. anthracis spores (q-dots585-IgGαB. anthracis and q-dots655-IgGαB.anthracis). These conjugates enabled us to achieve double staining of B. anthracis spores which improve the FCM analysis specificity versus control Bacillus spores. Moreover, multiplexed analysis of B. anthracis spores and Y. pestis bacteria was achieved by using specific antibodies labeled with different q-dots to obtain: q-dots585-IgGαB. anthracis and q-dots655-IgGαY.pestis, each characterized by its own emission peak as a marker. Specific and sensitive multiplex analysis for both pathogens has
been achieved, down to 103 bacteria per ml in the sample. |
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