On Fri, 13 Aug 1999, KuS wrote:
> Hello,
>> I would just like to know if the principles of the freeze-drying in a
> lyophilizator and in a speed-vac machine are the same?
>> Thanks,
>> Barbara (info at kos-computers.si)
Hi Barbara,
Well, although both freeze-drying (lyophilization) and speed-vac drying
involve pulling a vacuum on your samples, the process of removal of water
in each instrument is different. With freeze-drying, the samples are
frozen, and water is removed through the process of sublimation- solid
water is lost as a gas. With a speed-vac, the sample is not frozen but is
usually heated in a chamber while being spun at high rpm's; liquid water
is lost as a gas.
Reno
*************************************************************************
Reno T. Nguyen
Chesapeake Biological Laboratory /----\ /-----\ /
Univ. MD Center for Environmental Science / / / /
P.O. Box 38 / /______/ /
Solomons, MD 20688 / / \ /
/ / //
Tel: (410) 326-7261 \_______/ \_______/ \_______/
(410) 326-7409
Fax: (410) 326-7341
E-mail: reno at cbl.umces.edu
************************************************************************
