Abstract
Circulating and excretory l-homoarginine (hArg) and asymmetric dimethylarginine (ADMA) are cardiovascular risk factors. l-Arginine (Arg) is the common precursor of hArg and ADMA. This protocol describes gas chromatography–mass spectrometry (GC–MS) and gas chromatography–mass spectrometry–mass spectrometry (GC–MS/MS) methods for the quantitative determination of hArg, Arg and ADMA in biological samples, including human plasma, urine and sputum. Aliquots (10 µL) of native urine, plasma or serum ultrafiltrate (cutoff, 10 kDa), and acetone-deproteinized sputum samples are evaporated to dryness. Then, amino acids are derivatized to their methyl ester N-pentafluoropropionyl derivatives. In parallel, trideuteromethyl ester N-pentafluoropropionyl derivatives of hArg, Arg and ADMA are de novo synthesized from the unlabelled amino acids and used as internal standards. Alternatively, commercially available stable isotope-labeled analogs of hArg, Arg and ADMA are used as internal standards, and they are added to the native biological samples. Quantification is performed by selected ion monitoring in GC–MS and selected reaction monitoring in GC–MS/MS. By these protocols, unlabelled and stable isotope-labeled hArg, Arg and their metabolites including ADMA and ornithine can be measured equally accurately and precisely by GC–MS and GC–MS/MS in several different biological fluids in experimental and clinical settings.
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Abbreviations
- ADMA:
-
Asymmetric dimethylarginine (N G,N G-dimethyl-l-arginine)
- AGAT:
-
Arginine:glycine amidinotransferase
- Arg:
-
Arginine
- CID:
-
Collision-induced dissociation
- EA:
-
Ethyl acetate
- ECNICI:
-
Electron-capture negative-ion chemical ionization
- GC–MS:
-
Gas chromatography–mass spectrometry
- GC–MS/MS:
-
Gas chromatography–mass spectrometry–mass spectrometry
- hArg:
-
Homoarginine
- ID:
-
Internal diameter
- IS:
-
Internal standard
- Me:
-
Methyl
- MeOH:
-
Methanol
- NO:
-
Nitric oxide
- NOS:
-
Nitric oxide synthase
- Orn:
-
Ornithine
- PFP:
-
Pentafluoropropionyl
- PFPA:
-
Pentafluoropropionic anhydride
- QC:
-
Quality control
- SDMA:
-
Symmetric dimethylarginine (N G,N G′-dimethyl-l-arginine)
- SIM:
-
Selected-ion monitoring
- SRM:
-
Selected-reaction monitoring
- TSQ:
-
Triple-stage quadrupole
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Acknowledgments
This work was in part funded by the DFG; SFB 738 (to GW).
Conflict of interest
The authors declare that they have no conflict of interest.
Ethical standard
All animals received humane care in compliance with the German animal protection legislation, the Principles of Laboratory Animal Care, and the Guide for the Care and Use of Laboratory Animals (Institute of Laboratory Animal Resources, National Research Council. Principles of laboratory animal care, and the guide for the care and use of laboratory animals. Washington, DC: National Academies Press; 1996). The study was approved by the government board for animal welfare of Lower Saxony, Germany.
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Kayacelebi, A.A., Knöfel, AK., Beckmann, B. et al. Measurement of unlabeled and stable isotope-labeled homoarginine, arginine and their metabolites in biological samples by GC–MS and GC–MS/MS. Amino Acids 47, 2023–2034 (2015). https://doi.org/10.1007/s00726-015-1984-3
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DOI: https://doi.org/10.1007/s00726-015-1984-3