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Solublising Casein for use as blocking agent


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#1 Svengali

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Posted 03 July 2002 - 04:04 AM

hi.  A number of groups and protocols recommend the use of casein as a blocking reagent in elisa, western, and so on.  I am aware that it is quite insoluble in water, but the question is, should i try to solublise it, or use it as an insoluble suspension?  If i should solublise it, the big question is, how?  I have read  that it is highly soluble in alkali, but will this then be suitable for the applicationsa i have in mind?  Hope you can help,

Sven


#2 ragno

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Posted 05 July 2002 - 08:44 AM

Hi,
I use alkalisoluble casein (Merck) for blocking agent in western blot ( QIAGEN protocol).
casein preparation :
- make TBS + 1% casein pH 7,5 as :
 1) tris 10mM + Na Cl 150mM + casein without adjust pH (pH 10) with stirring.
 2) Adjust pH with HCl 1N at pH 7,5
3) stir at least 30mn and adjust the final volume

good luck
michel


#3 sklsfx

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Posted 12 July 2002 - 03:53 AM

I have used 0.5% casein in 1xPBS as blocking agent in western blot and ELISA before, but I found it alright even the casein is not soluble. Just stir it for a while and then pipette the supernatant only




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