TITLE

Selective isolation of acidic proteins with a thin layer of multiwalled carbon nanotubes functionalized with polydiallyldimethylammonium chloride

AUTHOR(S)
Zhuo Du; Yongliang Yu; Jianhua Wang
PUB. DATE
November 2008
SOURCE
Analytical & Bioanalytical Chemistry;Nov2008, Vol. 392 Issue 5, p937
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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 composites with a thickness of ca. 5 μm formed on the membrane. A 4 × 1 cm piece of the obtained membrane was supported by a stainless steel wire mesh and was then sandwiched between two PTFE films with grooved flow-through channels to form an extraction module. This module with a flow inlet and outlet was incorporated into a sequential injection system for performing the on-line separation and preconcentration of acidic protein, i.e., bovine serum albumin (BSA), and the BSA retained on the layer was eluted with a citrate buffer used as stripping reagent. In addition to a significant reduction in flow resistance, a dynamic sorption capacity of 3.8 mg mg−1 or 1.4 mg cm−2 for BSA was achieved using the layer-based system—a 146-fold improvement over that obtained using a packed microcolumn mode. A sample volume of 2.0 ml yielded an enrichment factor of 17, a retention efficiency of 100% and a recovery of 95%, along with a sampling frequency of 20 h−1 and a RSD value of 2.8% at 25 μg ml−1 for BSA. The practical applicability of the system was demonstrated by isolating acidic proteins (especially human serum albumin) from whole blood. [Figure not available: see fulltext.]
ACCESSION #
34851674

 

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