Nitrocellulose

Nitrocellulose is "a derivative of cellulose and is also known as cellulose nitrate" (http://www.dow.com/dowwolff/en/industrial_solutions/polymers/nitrocellulose/).

It can be used to absorb proteins from polyacrylamide gels, usually after electrophoresis (http://www.pnas.org/content/76/9/4350.short). See Western blotting