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The selective isolation of acidic proteins using a thin layer of multiwalled carbon nanotubes (MWNTs) functionalized with polydiallyldimethylammonium chloride (PDDA) was demonstrated. A certain amount (20 ml) of a suspension of PDDA-functionalized MWNTs that had been well dispersed by sonication was filtered through an MF-Millipore membrane with a pore aperture of 1.2 μm, and a uniform layer of PDDA-MWNT...
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