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Roca LS, Adamopoulou T, Nawada SH, Schoenmakers PJ. Introduction of Octadecyl-Bonded Porous Particles in 3D-Printed Transparent Housings with Multiple Outlets. Chromatographia 2022; 85:783-793. [PMID: 35965655 PMCID: PMC9363280 DOI: 10.1007/s10337-022-04156-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 03/29/2022] [Accepted: 03/31/2022] [Indexed: 11/03/2022]
Abstract
AbstractMicrofluidic devices for comprehensive three-dimensional spatial liquid chromatography will ultimately require a body of stationary phase with multiple in- and outlets. In the present work, 3D printing with a transparent polymer resin was used to create a simplified device that can be seen as a unit cell for an eventual three-dimensional separation system. Complete packing of the device with 5-μm C18 particles was achieved, with reasonable permeability. The packing process could be elegantly monitored from the pressure profile, which implies that optical transparency may not be required for future devices. The effluent flow was different for each of the four outlets of the device, but all flows were highly repeatable, suggesting that correction for flow-rate variations is possible. The investigation into flow patterns through the device was supported by computational-fluid-dynamics simulations. A proof-of-principle separation of four standard peptides is described, with mass-spectrometric detection for each of the four channels separately.
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Roca LS, Schoemaker SE, Pirok BW, Gargano AF, Schoenmakers PJ. Accurate modelling of the retention behaviour of peptides in gradient-elution hydrophilic interaction liquid chromatography. J Chromatogr A 2020; 1614:460650. [DOI: 10.1016/j.chroma.2019.460650] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 10/18/2019] [Accepted: 10/22/2019] [Indexed: 10/25/2022]
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Pirok BWJ, Molenaar SRA, Roca LS, Schoenmakers PJ. Peak-Tracking Algorithm for Use in Automated Interpretive Method-Development Tools in Liquid Chromatography. Anal Chem 2018; 90:14011-14019. [PMID: 30396266 PMCID: PMC6282104 DOI: 10.1021/acs.analchem.8b03929] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
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A peak-tracking algorithm
for chromatograms recorded using liquid
chromatography and mass spectrometry was developed. Peaks are tracked
across chromatograms using the spectrometric information, the statistical
moments of the chromatographic peaks, and the relative retention.
The algorithm can be applied to pair chromatographic peaks in two
very different chromatograms, obtained for different samples using
different methods. A fast version of the algorithm was specifically
tailored to process chromatograms obtained during method development
or optimization, where a few similar mobile-phase-composition gradients
(same eluent components, but different ranges and programming rates)
are applied to the same sample for the purpose of obtaining model
parameters to describe the retention of sample components. Due to
the relative similarity between chromatograms, time-saving preselection
protocols can be used to locate a candidate peak in another chromatogram.
The algorithm was applied to two different samples featuring isomers.
The automatically tracked peaks and the resulting retention parameters
generally yielded prediction errors of less than 1%.
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Affiliation(s)
- Bob W J Pirok
- van 't Hoff Institute for Molecular Sciences, Analytical Chemistry Group , University of Amsterdam , Science Park 904 , 1098 XH Amsterdam , The Netherlands.,TI-COAST , Science Park 904 , 1098 XH Amsterdam , The Netherlands
| | - Stef R A Molenaar
- van 't Hoff Institute for Molecular Sciences, Analytical Chemistry Group , University of Amsterdam , Science Park 904 , 1098 XH Amsterdam , The Netherlands
| | - Liana S Roca
- van 't Hoff Institute for Molecular Sciences, Analytical Chemistry Group , University of Amsterdam , Science Park 904 , 1098 XH Amsterdam , The Netherlands
| | - Peter J Schoenmakers
- van 't Hoff Institute for Molecular Sciences, Analytical Chemistry Group , University of Amsterdam , Science Park 904 , 1098 XH Amsterdam , The Netherlands
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Abstract
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Recent
progress in top-down proteomics has driven the demand for
chromatographic methods compatible with mass spectrometry (MS) that
can separate intact proteins. Hydrophilic interaction liquid chromatography
(HILIC) has recently shown good potential for the characterization
of glycoforms of intact proteins. In the present study, we demonstrate
that HILIC can separate a wide range of proteins exhibiting orthogonal
selectivity with respect to reversed-phase LC (RPLC). However, the
application of HILIC to the analysis of low abundance proteins (e.g.,
in proteomics analysis) is hampered by low volume loadability, hindering
down-scaling of the method to column diameters below 2.1 mm. Moreover,
HILIC-MS sensitivity is decreased due to ion suppression from the
trifluoroacetic acid (TFA) often used as the ion-pair agent to improve
the selectivity and efficiency in the analysis of glycoproteins. Here,
we introduce a capillary-based HILIC-MS method that overcomes these
problems. Our method uses RPLC trap-columns to load and inject the
sample, circumventing issues of protein solubility and volume loadability
in capillary columns (200 μm ID). The low flow rates and use
of a dopant gas in the electrospray interface improve protein-ionization
efficiencies and reduce suppression by TFA. Overall, this allows the
separation and detection of small protein quantities (down to 5 ng
injected on column) as indicated by the analysis of a mixture of model
proteins. The potential of the new capillary HILIC-MS is demonstrated
by the analysis of a complex cell lysate.
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Affiliation(s)
- Andrea F G Gargano
- Centre for Analytical Science Amsterdam , Science Park 904 , 1098 XH Amsterdam , The Netherlands.,Amsterdam Institute for Molecules, Medicines and Systems , Vrije Universiteit Amsterdam , de Boelelaan 1083 , 1081 HV Amsterdam , The Netherlands.,Van 't Hoff Institute for Molecular Sciences , Science Park 904 , 1098 XH Amsterdam , Netherlands
| | - Liana S Roca
- Centre for Analytical Science Amsterdam , Science Park 904 , 1098 XH Amsterdam , The Netherlands.,Van 't Hoff Institute for Molecular Sciences , Science Park 904 , 1098 XH Amsterdam , Netherlands
| | - Ryan T Fellers
- Departments of Chemistry and Molecular Bioscience and the Proteomics Center of Excellence , Northwestern University , 2145 N. Sheridan Road , Evanston , Illinois 60208 , United States
| | - Max Bocxe
- Amsterdam Institute for Molecules, Medicines and Systems , Vrije Universiteit Amsterdam , de Boelelaan 1083 , 1081 HV Amsterdam , The Netherlands
| | - Elena Domínguez-Vega
- Amsterdam Institute for Molecules, Medicines and Systems , Vrije Universiteit Amsterdam , de Boelelaan 1083 , 1081 HV Amsterdam , The Netherlands.,Center for Proteomics and Metabolomics , Leiden University Medical Center , Postbus 9600, 2300 RC Leiden , The Netherlands
| | - Govert W Somsen
- Centre for Analytical Science Amsterdam , Science Park 904 , 1098 XH Amsterdam , The Netherlands.,Amsterdam Institute for Molecules, Medicines and Systems , Vrije Universiteit Amsterdam , de Boelelaan 1083 , 1081 HV Amsterdam , The Netherlands
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