Quantitative determination of cyclic phosphatidic acid in human serum by LC/ESI/MS/MS.
J Chromatogr B Analyt Technol Biomed Life Sci
; 862(1-2): 161-7, 2008 Feb 01.
Article
in En
| MEDLINE
| ID: mdl-18155973
ABSTRACT
An LC/ESI/MS/MS method for cyclic phosphatidic acid (cPA) quantification in serum is established in the present report. The limit of quantitation of the assay reaches low nanomolar level in human serum and the CV% are within 10%. Using this method, we successfully quantify the levels of two cPA species, 160 and 181, in human serum. We find that the concentrations of 160 cPA in the serum of normal subjects and post-surgery ovarian cancer patients are significantly higher than its corresponding concentration in pre-surgery ovarian cancer patients, supporting the observation that cPA has anti-cancer activity. Another discovery is that the addition of strong acids (such as hydrochloric acid) in human serum may lead to the production of artificial cPA. Therefore, strong acids should be avoided in the extraction of cPA present in a complex matrix. Based on this observation, a new lipid extraction method was developed and used to extract cPA. The extraction recovery is close to 80%, guaranteeing an accurate quantification of cPA by LC/ESI/MS/MS can be performed.
Search on Google
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Phosphatidic Acids
/
Chromatography, Liquid
/
Spectrometry, Mass, Electrospray Ionization
/
Tandem Mass Spectrometry
Type of study:
Diagnostic_studies
/
Observational_studies
Limits:
Female
/
Humans
Language:
En
Journal:
J Chromatogr B Analyt Technol Biomed Life Sci
Journal subject:
ENGENHARIA BIOMEDICA
Year:
2008
Document type:
Article
Affiliation country:
United States