[Histonet] Isopentane

Markus F. Meyenhofer micro <@t> superlink.net
Tue Dec 16 20:47:12 CST 2008

Isopentane is cooled by liquid N2!
To freeze tissue direct in LN2  is not the best way to freeze tissue due to 
the Leidenfrost effect, creating an insulating gas layer between the tissue 
and the liquid and delaying the speed of freezing = an increase in ice 
crystal formation.
Markus F. Meyenhofer

----- Original Message ----- 
From: "Tony Henwood" <AnthonyH <@t> chw.edu.au>
To: "Dana Settembre" <settembr <@t> umdnj.edu>; "carmen loiselle" 
<carmen_loiselle <@t> hotmail.com>; "pathology education" 
<histonet <@t> pathology.swmed.edu>
Sent: Tuesday, December 16, 2008 6:19 PM
Subject: RE: [Histonet] Isopentane

Try liquid nitrogen


Tony Henwood JP, MSc, BAppSc, GradDipSysAnalys, CT(ASC)
Laboratory Manager & Senior Scientist
Tel: 612 9845 3306
Fax: 612 9845 3318
the children's hospital at westmead
Cnr Hawkesbury Road and Hainsworth Street, Westmead
Locked Bag 4001, Westmead NSW 2145, AUSTRALIA

-----Original Message-----
From: histonet-bounces <@t> lists.utsouthwestern.edu
[mailto:histonet-bounces <@t> lists.utsouthwestern.edu] On Behalf Of Dana
Sent: Wednesday, 17 December 2008 5:27 AM
To: carmen loiselle; pathology education
Subject: Re: [Histonet] Isopentane

Hello Carmen,
Sorry I have no alternative.  I know most labs use that.
When I worked in a neuropathology lab the isopentane was kept in the
refrigerator - an explosion proof one. I believe that means there's no
lightbulb inside and no inner working of a lightbulb inside either.

Dana Settembre, HT ASCP
Immunohistochemistry Lab
UMDNJ - University Hospital
Newark, NJ    USA

>>> carmen loiselle <carmen_loiselle <@t> hotmail.com> 12/16/08 12:24 PM

Hello ,

I currently work in a neuromuscular lab and all muscle biopsies received
should be cut frozen, no formalin fixed tissues.  My concern though, is
to work with isopentane , a well known excellent heat conductor but also
it has the bad reputation of being very explosive.
In fact , I've been told that few years ago, a lab close by of where I
work , did explode because of this solution.  Is there , in your
knowledge, any other chemical we can use as replacement and that give as
good results.

Any input will be greatly appreciated

Merry XMas to all and happy New Year

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