freeze-drier for HPLC fractions

[John K. Troyer]

On 19 Sep 1995, Denni Schnapp wrote:

> 
> Dear netters,
> 
> We are doing a lot of reverse phase HPLC separation of peptides
> with ACN gradients in 0.1% TFA. We need to freeze-dry our HPLC
> fractions and are currently thinking about obtaining our own
> freeze-drying system. Several people have told me that neither ACN
> nor TFA are particularly good for the pump. So, does anyone know
> about what type of (cheap!) pump may be best suited for the job?
> Any experiences?
> 
> Thanks for your advise!



Denni:


ACN and TFA are not very good for the pump.  However, I have used a Savant 
"Speed-Vac" with a cold trap to dry my HPLC samples instead of a 
classic freeze drier.  As long as the cold trap is maintained, there should 
be little damage to the pump.  Hope this helps.



Regards,

John


********************************************
John K. Troyer, PhD
University of Maryland School of Medicine
Departmant of Biological Chemistry
(410) 706-7518
jtroyer at umabnet.ab.umd.edu
********************************************