Re: "Who is the first"
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Using 1% or greater H2O2 to block endogenous peroxidase has a detrimental
effect
on the epitope recognised by anti CD4 clone 1F6 (ref. datasheet).
NC recommends blocking with 0.5% H2O2 before unmasking the antigen,
but in my hands, best results with this antibody were obtained when
endogenous
peroxidase was blocked after incubation of primary antibody
(higher concentrations of H2O2 may then be used)
Please take a look at "Blocking Peroxidase", Discussion Board at
http://home.no.net/immuno or go there directly at:
http://home.no.net/immuno2/yabb-bin/yabb/YaBB.cgi?board=news;action=display;
num=1031669926
Hogne Roed Nilsen
http://home.no.net/immuno
immunohistochemistry@netcom.no
Date: 12 Apr 2003 22:10:59 -0600
From: IHC World
Subject: Re: "Who is the first"
RE: "Who is the first"In theory, blocking of endogenous peroxidase activity
can be applied at any step BEFORE incubation of HRP-conjugated antibody. I
usually do the blocking step after HIER/PIER, but have been testing it
before
HIER/PIER. No difference was observed. So I think the key is to be
consistent
cross all experiments.
Richard
IHC World
Email: info@ihcworld.com
Web: www.ihcworld.com
----- Original Message -----
From: Tony Henwood
To: 'Fernando Capela e Silva' ; HISTONET@pathology.swmed.edu
Sent: Wednesday, April 09, 2003 4:43 PM
Subject: RE: "Who is the first"
We block endogenous peroxidase (Methanol-H2O2) before HIER or enzyme
retrieval
Tony Henwood JP, BappSc, GradDipSysAnalys, CT(ASC)
Laboratory Manager
The Children's Hospital at Westmead,
Locked Bag 4001, Westmead, 2145, AUSTRALIA.
Tel: (02) 9845 3306
Fax: (02) 9845 3318
http://www.histosearch.com/homepages/TonyHenwood/default.html
http://us.geocities.com/tonyhenwoodau/index.html
-----Original Message-----
From: Fernando Capela e Silva [mailto:fcs@uevora.pt]
Sent: Wednesday, 9 April 2003 18:31
To: HISTONET@pathology.swmed.edu
Subject: "Who is the first"
In immunohistochemistry "who is the first"?
Pre-treatment (HIER or enzymatic digestion) of tissues and after hydrogen
peroxide to eliminate endogenous activity
or
Hydrogen peroxide to eliminate endogenous activity and after pretreatment
(HIER or enzymatic digestion) of tissues
I already see both procedures. Is not important the order?
With compliments
* * * * * * * * * * * * * * * * * * * * * * * * *
Fernando Capela e Silva
Laborat#243#rio de Biologia da Conserva#231##227#o
Departamento de Biologia
Universidade de ...vora
Apartado 94
7002-554 ...vora
PORTUGAL
Phone: +351-266 760 800
Fax: +351-266 711 231
Email: fcs@uevora.pt
http://evunix.uevora.pt/~fcs/FernandoCapelaSilva.htm
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