One place you might want to look if you don't want to make your own NTA
Agarose (or whatever) is Pharmacia. They now sell Chelating Sepharose FF
(Cat. No: 17-0575-01 for 50ml pack size) which chelates ANY metal ion
(more or less) that you want and comes uncharged i.e. you can charge the
resin as you want. It's _much_ cheaper (I think 50ml is ~80 pounds
sterling) than the pre-charged ripoff resins from Invitrogen etc.
Hope thats of some use,
Dr. Simon Dawson TEL:+44 (0)115 9249924 ex. 44789
Dept. of Biochemistry FAX:+44 (0)115 9422225
Queens Medical Centre Email:Simon.Dawson at .nott.ac.uk
Clifton Boulevard http://www.ccc.nottingham.ac.uk/~mbzspd/Simon.html
U.K. "Back off man, I'm a scientist!" - Bill Murray.