Diagnostic approach to thyroid cancer based on amino acid metabolomics in saliva by ultra-performance liquid chromatography with high resolution mass spectrometry

Talanta ◽  
2021 ◽  
pp. 122729
Author(s):  
Jing Zhang ◽  
Xinxin Wen ◽  
Yuting Li ◽  
Jing Zhang ◽  
Xian Li ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Thyroid Cancer ◽  
Liquid Chromatography ◽  
Amino Acid ◽  
High Resolution ◽  
High Resolution Mass Spectrometry ◽  
Ultra Performance Liquid Chromatography ◽  
Diagnostic Approach ◽  
High Resolution Mass ◽  
Resolution Mass

scholarly journals Identification of Auxin Metabolites in Brassicaceae by Ultra-Performance Liquid Chromatography Coupled with High-Resolution Mass Spectrometry

Molecules ◽  
2019 ◽  
Vol 24 (14) ◽  
pp. 2615 ◽  
Author(s):  
Panagiota-Kyriaki Revelou ◽  
Maroula G. Kokotou ◽  
Violetta Constantinou-Kokotou
Keyword(s):  
Mass Spectrometry ◽  
Amino Acids ◽  
Liquid Chromatography ◽  
High Resolution ◽  
Plant Extracts ◽  
High Resolution Mass Spectrometry ◽  
Ultra Performance Liquid Chromatography ◽  
Charge Ratio ◽  
High Resolution Mass ◽  
Resolution Mass

Auxins are signaling molecules involved in multiple stages of plant growth and development. The levels of the most important auxin, indole-3-acetic acid (IAA), are regulated by the formation of amide and ester conjugates with amino acids and sugars. In this work, IAA and IAA amide conjugates with amino acids bearing a free carboxylic group or a methyl ester group, along with some selected IAA metabolites, were studied in positive and negative electrospray ionization (ESI) modes, utilizing high-resolution mass spectrometry (HRMS) as a tool for their structural analysis. HRMS/MS spectra revealed the fragmentation patterns that enable us to identify IAA metabolites in plant extracts from eight vegetables of the Brassicaceae family using a fast and reliable ultra-performance liquid chromatography quadrupole time-of-flight mass spectrometry (UPLC-QToF-MS) method. The accurate m/z (mass to charge) ratio and abundance of the molecular and fragment ions of the studied compounds in plant extracts matched those obtained from commercially available or synthesized compounds and confirmed the presence of IAA metabolites.

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