Multichannel open tubular enzyme reactor online coupled with mass spectrometry for detecting ricin
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For counterterrorism purposes, a selective nano liquid chromatography–mass spectrometry (nanoLC-MS) platform was developed for detecting the highly lethal protein ricin from castor bean extract. Manual sample preparation steps were omitted by implementing a trypsin/Lys-C enzyme-immobilized multichannel reactor (MCR) consisting of 126 channels (8 μm inner diameter in all channels) that performed online digestion of proteins (5 min reaction time, instead of 4–16 h in previous in-solution methods). Reduction and alkylation steps were not required. The MCR allowed identification of ricin by signature peptides in all targeted mode injections performed, with a complete absence of carry-over in blank injections. The MCRs (interior volume ≈ 1 μL) have very low backpressure, allowing for trivial online coupling with commercial nanoLC-MS systems. The open tubular nature of the MCRs allowed for repeatable within/between-reactor preparation and performance.
Brandtzaeg, Ole Kristian; Røen, Bent Tore; Enger, Siri; Lundanes, Elsa; Wilson, Steven Ray Haakon. Multichannel open tubular enzyme reactor online coupled with mass spectrometry for detecting ricin. Analytical Chemistry 2017 ;Volum 89.(17) s. 8667-8673