Determination of Ginsenosides Rb1, Rc, and Rein Different Dosage Forms of Ginseng by Negative Ion Electrospray Liquid Chromatography−Mass Spectrometry

2004 ◽  
Vol 52 (16) ◽  
pp. 4953-4956 ◽  
Author(s):  
Ron Luchtefeld ◽  
Elisabet Kostoryz ◽  
Robert E. Smith
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Dosage Forms ◽  
Negative Ion ◽  
Liquid Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry

scholarly journals Determination of Chloramphenicol Residues in Milk, Eggs, and Tissues by Liquid Chromatography/Mass Spectrometry

2005 ◽  
Vol 88 (2) ◽  
pp. 645-653 ◽  
Author(s):  
Lisa Penney ◽  
Anderson Smith ◽  
Brent Coates ◽  
Arosha Wijewickreme
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Reversed Phase ◽  
Negative Ion ◽  
Liquid Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Relative Standard ◽  
The Matrix ◽  
Working Day

Abstract A new liquid chromatography/mass spectrometry (LC/MS) method is presented for the determination of chloramphenicol (CAP) residues in milk, eggs, chicken muscle and liver, and beef muscle and kidney. CAP is extracted from the samples with acetonitrile and defatted with hexane. The acetonitrile extracts are then evaporated, and residues are reconstituted in 10mM ammonium acetate–acetonitrile mobile phase and injected into the LC system. CAP is determined by reversed-phase chromatography using an Inertsil ODS-2 column and MS detection with negative ion electrospray ionization. Calibration curves were linear between 0.5–5.0 ng/g for all matrixes studied. The relative standard deviations for measurements by this method were generally <12%, and average recoveries ranged from 80 to 120%, depending on the matrix involved. The method detection limits of CAP ranged from 0.2 to 0.6 ng/g, which are comparable to previously reported results. The proposed method is rapid, simple, and specific, allowing a single analyst to easily prepare over 40 samples in a regular working day.

scholarly journals Determination of regulatory ionophore coccidiostat residues in feedstuffs at carry-over levels by liquid chromatography-mass spectrometry

PLoS ONE ◽  
2017 ◽  
Vol 12 (8) ◽  
pp. e0182831 ◽  
Author(s):  
Loredana Annunziata ◽  
Pierina Visciano ◽  
Arianna Stramenga ◽  
Maria Novella Colagrande ◽  
Guido Campana ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Liquid Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Carry Over
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