Nanocapillaries for open tubular chromatographic separations of proteins in femtoliter to picoliter samples.

Nanocapillaries for open tubular chromatographic separations of proteins in femtoliter to picoliter samples.
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DOI:
10.1021/ac901265t
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发表时间:
2009-09-01
影响因子:
7.4
通讯作者:
Liu, Shaorong
Liu, Shaorong
中科院分区:
化学1区
文献类型:
--
作者:
Wang, Xiayan;Cheng, Chang;Wang, Shili;Zhao, Meiping;Dasgupta, Purnendu K.;Liu, Shaorong

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We have recently examined the potential of bare nanocapillaries for free solution DNA separations and demonstrated efficiencies exceeding 106 theoretical plates/m. In the present work, we demonstrate the use of bare and hydroxypropylcellulose (HPC) coated open tubular nanocapillaries for protein separations. Using 1.5 μm inner diameter (i.d.) capillary columns, hydrodynamically injecting femto to picoliter (fL-pL) volumes of fluorescent or fluorescent dye labeled protein samples, utilizing a pneumatically pressurized chamber containing 1.0 mM sodium tetraborate solution eluent (typ. 200 psi) as the pump and performing on-column detection using a simple laser-induced fluorescence detector, we demonstrate efficiencies of close to a million theoretical plates/m while generating single digit μL volumes of waste for a complete chromatographic run. We achieve baseline resolution for a protein mixture consisting of transferrin, α-lactalbumin, insulin, and α -2-macroglobulin.
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