Document Detail

Deoxyribonucleic acid modified poly(dimethylsiloxane) microfluidic channels for the enhancement of microchip electrophoresis.
MedLine Citation:
PMID:  19159778     Owner:  NLM     Status:  MEDLINE    
In this paper, deoxyribonucleic acid (DNA) was employed to construct a functional film on the PDMS microfluidic channel surface and apply to perform electrophoresis coupled with electrochemical detection. The functional film was formed by sequentially immobilizing chitosan and DNA to the PDMS microfluidic channel surface using the layer-by-layer assembly. The polysaccharide backbone of chitosan can be strongly adsorbed onto the hydrophobic PDMS surface through electrostatic interaction in the acidic media, meanwhile, chitosan contains one protonatable functional moiety resulting in a strong electrostatic interactions between the surface amine group of chitosan and the charged phosphate backbone of DNA at low pH, which generates a hydrophilic microchannel surface and reveals perfect resistance to nonspecific adsorption of analytes. Aminophenol isomers (p-, o-, and m-aminophenol) served as a separation model to evaluate the effect of the functional PDMS microfluidic chips. The results clearly showed that these analytes were efficiently separated within 60s in a 3.7 cm long separation channel and successfully detected on the modified microchip coupled with in-channel amperometric detection mode at a single carbon fiber electrode. The theoretical plate numbers were 74,021, 92,658 and 60,552 Nm(-1) at the separation voltage of 900 V with the detection limits of 1.6, 4.7 and 2.5 microM (S/N=3) for p-, o-, and m-aminophenol, respectively. In addition, this report offered an effective means for preparing hydrophilic and biocompatible PDMS microchannel surface, which would facilitate the use of microfluidic devices for more widespread applications.
Ruping Liang; Pengfei Hu; Guihua Gan; Jianding Qiu
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-10-17
Journal Detail:
Title:  Talanta     Volume:  77     ISSN:  1873-3573     ISO Abbreviation:  Talanta     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-01-22     Completed Date:  2009-02-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984816R     Medline TA:  Talanta     Country:  England    
Other Details:
Languages:  eng     Pagination:  1647-53     Citation Subset:  IM    
Department of Chemistry, Nanchang University, Xue fu Road 999, Nanchang 330031, PR China.
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MeSH Terms
Aminophenols / isolation & purification
Dimethylpolysiloxanes / chemistry*
Electrophoresis, Microchip / instrumentation*,  methods,  standards
Microfluidic Analytical Techniques / instrumentation*
Nylons / chemistry*
Reg. No./Substance:
0/Aminophenols; 0/Dimethylpolysiloxanes; 0/Nylons; 0/poly(dimethylsiloxane)-polyamide copolymer; 9007-49-2/DNA; 9012-76-4/Chitosan

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