Solid-Phase Extraction Combined with High-Performance Liquid Chromatography−Atmospheric Pressure Chemical Ionization−Mass Spectrometry Analysis of Pesticides in Water:  Method Performance and Application in a Reconnaissance Survey of Residues in Drinking Water in Greater Cairo, Egypt

2007 ◽  
Vol 55 (2) ◽  
pp. 204-210 ◽  
Author(s):  
Thomas L. Potter ◽  
Mahmoud A. Mohamed ◽  
Hannah Ali
Keyword(s):  
High Performance ◽  
Solid Phase ◽  
Atmospheric Pressure Chemical Ionization ◽  
Mass Spectrometry Analysis ◽  
Ionization Mass ◽  
Method Performance ◽  
Spectrometry Analysis ◽  
Greater Cairo ◽  
Pesticides In Water ◽  
Pressure Chemical Ionization

scholarly journals Photo-Oxidative Protection of Chlorophyll a in C-Phycocyanin Aqueous Medium

Antioxidants ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1235
Author(s):  
Ji-Eun Hong ◽  
Jae-Hyun Lim ◽  
Tae-Yoon Kim ◽  
Hwa-Yong Jang ◽  
Han-Bin Oh ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Chlorophyll A ◽  
Atmospheric Pressure Chemical Ionization ◽  
Aqueous Media ◽  
Mass Spectrometry Analysis ◽  
Ionization Mass ◽  
Spectrometry Analysis ◽  
Pressure Chemical Ionization ◽  
Pressure Chemical

In this study, potential protection of chlorophyll a from illumination and oxidation-induced decomposition has been examined using C-phycocyanin (C-PC) aqueous medium. Photo-oxidation resistance of chlorophyll a was monitored in various aqueous media using ultraviolet-visible spectroscopy and direct-infusion atmospheric pressure chemical ionization mass spectrometry analysis. The spectroscopy results showed that chlorophyll a in C-PC medium experienced the lowest rate of conversion to its derivatives; thus, it was demonstrated that chlorophyll a was mostly intact in the C-PC medium. Furthermore, the C-PC treated with chlorophyll a showed the lowest concentrations of malondialdehyde, and chlorophyll a in C-PC medium did not cause serious damage to human liver cells in vitro after intensive illumination. Therefore, we propose a new method of protecting chlorophyll a from photodegradation and oxidation using C-PC aqueous medium.

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