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Ask LI-COR if you can get their IRDye800 conjugated to dextran.  It is very
bead like and would probably work for what you need.  On a related note:
What are you going to use to detect such a long wavelength?

http://www.licor.com/bio/products/reagents/irdye/irdye800cw.jsp

Craig



On Tue, Sep 24, 2013 at 8:49 AM, Ko, Alex <[log in to unmask]> wrote:

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> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
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>
> We are developing a tissue phantom with components that will absorb ~
> 800nm (not two-photon) and fluoresces at longer wavelength. Anyone knows
> any commercially available fluorescent beads /nanoparticles that we can use
> to create small fluorescent sources within the tissue phantom ?
>
> I have searched on the internet and found most commercial products are
> working with excitation below 700nm.
> Any comments are appreciated.
>
>
> ---------------------------
> Alex C-T. Ko
> Medical Devices
> National Research Council Canada
>