High-speed liquid chromatography/tandem mass spectrometry for the determination of drugs in biological samples

1986 ◽  
Vol 58 (12) ◽  
pp. 2453-2460 ◽  
Author(s):  
Thomas R. Covey ◽  
Edgar D. Lee ◽  
Jack D. Henion
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Tandem Mass Spectrometry ◽  
Biological Samples ◽  
High Speed ◽  
Tandem Mass ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass

scholarly journals Simultaneous Determination of Global DNA Methylation and Hydroxymethylation Levels by Hydrophilic Interaction Liquid Chromatography–Tandem Mass Spectrometry

2012 ◽  
Vol 17 (7) ◽  
pp. 877-884 ◽  
Author(s):  
Liangtao Zhang ◽  
Lijian Zhang ◽  
Keyuan Zhou ◽  
Xiaoxia Ye ◽  
Junjie Zhang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Tandem Mass Spectrometry ◽  
Simultaneous Determination ◽  
Biological Samples ◽  
Tandem Mass ◽  
Hydrophilic Interaction ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass

Methylation of DNA at the 5-position of cytosine (Cyt) is a well-studied epigenetic pathway implicated in gene silencing and embryogenesis. Recently, in addition to 5-methylcytosine (5mC), substantial amounts of 5-hydroxymethylcytosine (5hmC) have been detected in certain mammalian tissues. Here, we developed and validated a hydrophilic interaction liquid chromatography–tandem mass spectrometry (HILIC-MS/MS) method for the simultaneous determination of Cyt, 5mC, and 5hmC levels in biological samples. DNA was extracted with phenol-chloroform, hydrolyzed using 88% formic acid at 140 °C, separated using a bridged ethylene hybrid HILIC column, and analyzed by tandem MS. The linearity was established over the concentration range of 1 to 500 ng/mL for Cyt, 0.2 to 100 ng/mL for 5mC, and 0.1 to 50 ng/mL for 5hmC, and the correlation coefficients were all >0.99. Limits of detection were 1 pg/mL for Cyt, 45 pg/mL for 5mC, and 57 pg/mL for 5hmC, and the limit of quantification values for Cyt, 5mC, and 5hmC were 2 pg/mL, 90 pg/mL, and 100 pg/mL, respectively. The relative standard deviation (RSD) of the intraday precision ranged from 1.87% to 4.84% and the interday precision from 2.69% to 4.98%. The recovery of the method varied from 88.25% to 104.39%. The method was then applied to the analysis of DNA from biological samples, establishing its potential for helping researchers understand the roles of modified nucleobases in DNA.

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