Publications de Xiaoqin Zhong | EPFL Graph Search

On-Chip Spyhole Nanoelectrospray Ionization Mass Spectrometry for Sensitive Biomarker Detection in Small Volumes

Hubert Girault, Liang Qiao, Géraldine Margaretha Alice Stauffer, Xiaoqin Zhong

A polyimide microfluidic chip with a microhole emitter (Ø 10–12 μm) created on top of a microchannel by scanning laser ablation has been designed for nanoelectrospray ionization (spyhole-nanoESI) to couple microfluidics with mass spectrometry. The spyhole- ...

2018

Electrostatic spray ionization from 384-well microtiter plates for mass spectrometry analysis based enzyme assay and drug metabolism screening

Hubert Girault, Liang Qiao, Elena Tobolkina, Tzu-En Lin, Xiaoqin Zhong, Yan Deng, Emna Belghith

We have realized the direct ionization of samples from wells of microtiter plates under atmospheric conditions for mass spectrometry analysis without any liquid delivery system or any additional interface. The microtiter plate is a commercially available 3 ...

American Chemical Society2017

New ionization and tagging methods for mass spectrometry

Xiaoqin Zhong

Mass spectrometry (MS) is an essential detection tool in bioanalytical chemistry owing to its exceptional selectivity and sensitivity, paired with rapid analyte identification and quantification. In this thesis, two classical MS and a newly developed ioniz ...

EPFL2017

Mass Barcode Signal Amplification for Multiplex Allergy Diagnosis by MALDI-MS

Hubert Girault, Liang Qiao, Natalia Gasilova, Xiaoqin Zhong

A highly sensitive method based on mass-barcoded gold nanoparticles (AuNPs) and immunomagnetic separation has been developed for multiplex allergy diagnosis by MALDI mass spectrometry in a component-resolved manner. Different analytical probes were prepare ...

American Chemical Society2016

Ambient in situ analysis and imaging of both hydrophilic and hydrophobic thin layer chromatography plates by electrostatic spray ionization mass spectrometry

Hubert Girault, Liang Qiao, Xiaoqin Zhong

Electrostatic spray ionization (ESTASI) mass spectrometry imaging (MSI), recently developed to profile spatial distribution of chemical and biochemical molecules on an insulating surface under ambient conditions, has been applied to identify and quantify c ...

RSC Publishing2015

Electrostatic Spray Ionization Mass Spectrometry Imaging

Hubert Girault, Horst Vogel, Horst Pick, Liang Qiao, Elena Tobolkina, Andreas Stephan Lesch, Alexandra Bondarenko, Xiaoqin Zhong

Imaging samples on a surface by mass spectrometry (MS) requires the combination of MS detection with a scanning mode that enables localized desorption and ionization and/or detection of sample analytes with good spatial resolution. We have developed a new ...

Amer Chemical Soc2014