quadrupole linear ion trap
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Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1760
Author(s):  
Renata Pilkaitytė ◽  
Donata Overlingė ◽  
Zita Rasuolė Gasiūnaitė ◽  
Hanna Mazur-Marzec

This work aims to determine the profiles of cyanopeptides and anatoxin synthetized by cyanobacteria in the Lithuanian part of the Curonian Lagoon (SE Baltic Sea) and to characterize their spatial and temporal patterns in this ecosystem. Cyanometabolites were analysed by a LC-MS/MS system and were coupled to a hybrid triple quadrupole/linear ion trap mass spectrometer. During the investigation period (2013–2017), 10 microcystins, nodularin, anatoxin-a, 16 anabaenopeptins, including 1 oscillamide, 12 aeruginosins, 1 aeruginosamide, 3 cyanopeptolins and 4 microginins were detected. The most frequently detected metabolites were found at all investigated sites. Demethylated microcystin variants and anabaenopeptins had the strongest relationship with Planktothrix agardhii, while non-demethylated microcystin variants and anatoxin had the strongest relationship with Microcystis spp. Low concentrations of some microcystins: [Asp3]MC-RR, MC-RR, MC-LR, as well as a few other cyanopeptides: AP-A and AEG-A were found during the cold period (December–March). Over the study period, Aphanizomenon, Planktothrix and Microcystis were the main dominant cyanobacteria species, while Planktothrix, Microcystis, and Dolichospermum were potentially producers of cyanopeptides and anatoxin detected in samples from the Curonian Lagoon.


2019 ◽  
Vol 11 (21) ◽  
pp. 2756-2762
Author(s):  
Jiaming Fan ◽  
Pengfei Li ◽  
He Liu ◽  
Rui Zhao ◽  
Zhixia Zhao ◽  
...  

A convenient and sensitive LC-MS/MS method fitting for toxicokinetics study was validated for quantitation of paraquat in rat plasma.


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