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Na+ Negatively charged groups (red) Na+ Positively charged counterions Rinse in buffer, add ionic compounds. Positive charges (triangles) stick

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Na+

Negatively charged groups (red)

Na+

Na+

Na+

Na+

Na+

Na+

Na+Na+Na+

Na+

Na+

Na+

Na+

Na+ Na+

Positively charged counterions

Rinse in buffer, add ionic compounds. Positive charges (triangles) stick. Negatives (squares) and neutrals (pentagons) do not stick

Na+Na+

Na+

Na+

Sodium ions replaced by positively charged ions

Rinse

Cation Exchange Chromatography

From Wikipedia Commons, Author=Jeffrey M. Vinocurhttp://en.wikipedia.org/wiki/File:Gel_electrophoresis_apparatus.JPG

From Wikipedia Commons. Author = Dr d12http://en.wikipedia.org/wiki/File:DNAgel4wiki.png