期刊
ANALYTICA CHIMICA ACTA
卷 1140, 期 -, 页码 168-177出版社
ELSEVIER
DOI: 10.1016/j.aca.2020.09.062
关键词
Electrospray ionization; Microfluidics; Emitter; Reversed-phase chromatography; Mass spectrometry; Monolith
资金
- Danish Council for Independent Research (Sapere Aude grant) [DFF-4184-00537A]
Mass spectrometry (MS) is a key technology for sensitive and high-resolution mass analysis of peptides and proteins. Sample clean-up and chromatographic separation is typically performed prior to MS analysis to limit adduct formation and ionization suppression. Usually, this requires a high-pressure LC pump system equipped with expensive metal chromatographic columns placed in-line of an electrospray ionization (ESI) source. Microfluidic devices coupled to MS have gained considerable attention, due to the promise of low manufacturing costs, low sample consumption and channels with a high surface area to volume ratio and tailorable functional groups. Here, we describe a thiol-ene microfluidic chip capable of fast chromatographic sample clean-up, concentration, and separation of complex protein and peptide mixtures with direct on-chip ESI. On-chip reversed-phase chromatography (RPC) was performed through an in-situ polymerized monolith frit for retaining inexpensive commercially available reversed-phase (RP) spherical particles, while on-chip ESI is achieved through an emitter monolithically implemented by precision micro milling. The on-chip integration of both RPC and ESI emitter allowed for a minimization of dead-volumes and enables very fast sample clean-up, efficient ionization, and mass analysis of peptides and proteins from complex matrices. (c) 2020 Elsevier B.V. All rights reserved.
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