High yield sample preconcentration using a highly ion-conductive charge-selective polymer.
High yield sample preconcentration using a highly ion-conductive charge-selective polymer.
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DOI:
10.1021/ac101297t
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发表时间:
2010-07-15
影响因子:
7.4
通讯作者:
Ramsey, J. Michael
中科院分区:
文献类型:
--
作者:
Chun, Honggu;Chung, Taek Dong;Ramsey, J. Michael
The development and analysis of a microfluidic sample preconcentration system using a highly ion-conductive charge-selective polymer (poly-AMPS) is reported. The preconcentration is based on the phenomenon of concentration polarization which develops at the boundaries of the poly-AMPS with buffer solutions. A negatively charged polymer, poly-AMPS, positioned between two microchannels efficiently extracts cations through its large cross section, resulting in efficient anion sample preconcentration. The present work includes the development of a robust polymer that is stable over a wide range of buffers with varying chemical compositions. The sample preconcentration effect remains linear to over 3 mM (0.15 pmol) and 500 μM (15 fmol) for fluorescein and TRITC-tagged albumin solutions, respectively. The system can potentially be used for concentrating proteins on microfluidic devices with subsequent analysis for proteomic applications.
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