Alexa 546 vs 555

[mmodel]

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Dear List

 

Which Alexa dye do people prefer for use with a 543 laser, Alexa 546 or 555? Thanks!

 

Mike Model

Kent State University

 

 

[Kurt Thorn]

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Alexa 555 has a pretty low quantum yield.  I generally prefer 546,
though I've never used either with a 543 laser.

Kurt

MODEL, MICHAEL wrote:

> Search the CONFOCAL archive at
> http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
>
> Dear List
>
>  
>
> Which Alexa dye do people prefer for use with a 543 laser, Alexa 546
> or 555? Thanks!
>
>  
>
> Mike Model
>
> Kent State University
>
>  
>
>  
>

--
Kurt Thorn, PhD
Director, Nikon Imaging Center
University of California San Francisco

UCSF MC 2140
Genentech Hall Room S252
600 16th St.
San Francisco, CA 94158-2517

http://nic.ucsf.edu
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[Danielle Crippen]

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We use alexa 555 standard with the 543 laser and it’s great—fairly bright and stable (for fixed sample labeling at least).  I would hesitate to use 546 with the 543 laser…having a look at the Invitrogen fluorescence spectra viewer (no commercial interest) it will show that 543 laser will excite alexa 546 at about 40% efficiency, but alexa 555 at about 70% efficiency….of course these measurements are done in particular buffers etc. etc…just something to consider…

 

Cheers,

 

d

 

Danielle Crippen

Morphology and Imaging Core Manager

Buck Institute for Age Research

8001 Redwood Blvd

Novato, CA 94945

415-209-2046

 

---

From: Confocal Microscopy List [mailto:[hidden email]] On Behalf Of MODEL, MICHAEL
Sent: Monday, July 28, 2008 1:53 PM
To: [hidden email]
Subject: Alexa 546 vs 555

 

Dear List

 

Which Alexa dye do people prefer for use with a 543 laser, Alexa 546 or 555? Thanks!

 

Mike Model

Kent State University

 

 

[Jan Grawe]

Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
We initially used Alexa546, but have since switched to Al555, as the 546 seemed to bleach rather quickly in our hands. We find the 555 more photostable.
A number of groups here also use Cy3 with good results.


Best regards,

Janne

Jan Grawé
Cell Analysis Core Facility
Rudbecklaboratoriet/C5
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SWEDEN

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