scholarly journals A high resolution atmospheric pressure matrix-assisted laser desorption/ionization-quadrupole-orbitrap MS platform enables in situ analysis of biomolecules by multi-mode ionization and acquisition

2018 ◽  
Vol 1007 ◽  
pp. 16-25 ◽  
Author(s):  
Bingming Chen ◽  
Chuanzi OuYang ◽  
Zichuan Tian ◽  
Meng Xu ◽  
Lingjun Li
Keyword(s):  
High Resolution ◽  
Atmospheric Pressure ◽  
Laser Desorption ◽  
Laser Desorption Ionization ◽  
Desorption Ionization ◽  
Multi Mode ◽  
Orbitrap Ms ◽  
Matrix Assisted Laser ◽  
Matrix Assisted Laser Desorption

Determination of Triazines and Triazoles in Grapes Using Atmospheric Pressure Matrix-Assisted Laser Desorption/Ionization High-Resolution Mass Spectrometry

2017 ◽  
Vol 100 (3) ◽  
pp. 640-646 ◽  
Author(s):  
Vishal Mahale ◽  
Ajeet Singh ◽  
Gayatri S Phadke ◽  
Avinash D Ghanate ◽  
Dasharath P Oulkar ◽  
...  
Keyword(s):  
High Resolution ◽  
Atmospheric Pressure ◽  
Laser Desorption ◽  
High Mass ◽  
Quantitative Detection ◽  
Laser Desorption Ionization ◽  
Desorption Ionization ◽  
Field Samples ◽  
Matrix Assisted Laser ◽  
Matrix Assisted Laser Desorption

Abstract A chromatography-free atmospheric pressure matrix-assisted laser desorption/ionization high-resolution massspectrometry (AP-MALDI HRMS) method is described for the simultaneous and quantitative detection of triazines and triazoles in grapes. The analytes were detected reproducibly with high mass accuracy (mass error within 5 ppm) and further confirmed by collision-induced dissociation fragmentation in tandem MS. The LODs and LOQs forall the analytes were found to be in the nanogram per gram level (15–20 ng/g LOQ). Internal standard–normalized high-resolution accurate mass–extracted (HR-AM) peak intensities of the detected ions were used to generate the concentration response curves. Linearity (with R2 values around 0.99) was obtained for these curves within a concentration range of 20–200 ng/g of the individual analytes. The accuracy and precision of the method were further established using QC samples. Validation and performancecomparison of the AP-MALDI HRMS method with an existing standard method using LC with triple quadrupole MS was carried out (evaluating sensitivity, accuracy, precision, and analysis time) using 20 table-grape field samples after QuEChERS extraction.

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