[Cytometry] Qdot issue

Vinko Tosevski tosevski at immunology.uzh.ch
Fri May 13 04:11:01 EDT 2011

Hi Farooq,

When we were considering the inclusion of Qdots to our routine
staining panels, the only thing that made us feel a bit uncomfortable
was their advertised shelf life... We were told by local Invitrogen
people that their Qdot conjugated antibodies have a shelf life of 6-12
months. Maybe this is what you're seeing? Why don't you just try to
stain antibody capturing beads or try spectroscopy, to see if your
Qdot is still performing as a fluorochrome at all.


Vinko Tosevski
Institute of Experimental Immunology
University of Zurich, Irchel campus
Building 44, Room J42
Winterthurerstrasse 190
CH-8057 Zurich
Tel:  +41 44 6353706
Fax: +41 44 6356883
tosevski at immunology.uzh.ch

On Thu, May 12, 2011 at 5:29 PM, Farooq, Fouzia CONT NMRC
<Fouzia.Farooq at med.navy.mil> wrote:
> I have run into an dilemma with a Qdot in my flow panel.  I am using a 10
> color panel that has huCD45RA-Q605.  I have been running experiments using
> this panel for about 4 months now and I hadn't had any problems until about
> 2-3 weeks ago where I opened up a new vial of the Ab and when I acquired
> there was no staining.  I am only adding this ab in my surface cocktail.
> I did purchase the ab back in December (bought 7 vials) because I wanted to
> keep the lot num consistent throughout the study.  It worked great for a
> while and then it stopped all of a sudden.  I've done multiple experiments
> testing varying conditions and still no staining.  I am not seeing any
> clumps in the vial and I'm storing ab at the recommended conditions.
> I was wondering if anyone else has observed maybe similar issues? Lot I'm
> using is #834666.
> Thank you in advance,
> Fouzia Farooq
> Flow Cytometry Center, 3W48
> Division of Malaria Vaccine Development
> 503 Robert Grant Ave
> Silver Spring, MD 20910
> 301.319.3125
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