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
Ramsey, J. Michael
中科院分区:
化学1区
文献类型:
--
作者:
Chun, Honggu;Chung, Taek Dong;Ramsey, J. Michael

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据报道,使用高离子导电电荷选择性聚合物(聚-AMPS)开发和分析了微流体样品预浓缩系统。预浓缩是基于浓度极化现象,该现象在具有缓冲溶液的聚-AMPS的边界处产生。带负电的聚合物聚 AMPS 位于两个微通道之间,通过其大横截面有效提取阳离子,从而实现高效的阴离子样品预浓缩。目前的工作包括开发一种坚固的聚合物,该聚合物在具有不同化学成分的多种缓冲液中保持稳定。对于荧光素和 TRITC 标记的白蛋白溶液,样品预浓缩效果分别在 3 mM (0.15 pmol) 和 500 μM (15 fmol) 以上保持线性。该系统可用于在微流体装置上浓缩蛋白质,并随后进行蛋白质组学应用分析。
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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