Details on CNBr Cleavage

[CTHOMPSON at ARSERRC.GOV]

Hello,
I was wondering if anyone could direct me to the correct use of a 
Cyanogen Bromide Activated Matix on Sepharose 4B (by Sigma) which is
lactose and Dextran.  I would like to cleave collagen at its methionine
sites but I don't know if I can hydrate the Sepheraose with solutions
with a pH around 2.0.  Will the cyanogen bromide come off into solution at
that pH?

Craig