|Molecular Weight||182.176 g/mol|
Catecholamines are chemical compounds derived from the amino acid tyrosine containing catechol and amine groups. Some of them are biogenic amines. Retention of compounds of catecholamine pathway is achieved on Obelisc N column. All polar compounds are well retained by combination of HILIC and ion-exchange mechanisms. Obelisc N columns produce very good peak shapes for all analytes. Method is very sensitive to amount of ACN, buffer and buffer pH. Retention time changes with variation of main parameters. This method can be used for quantitation of biogenic amines and related compounds (homovanillic acid, dihydroxyphenyl acetic acid, serotonin, dopamine, epinephrine, hydroxytryptophan, epinephrine and DOPA) in urine, blood and other biological fluids. Further optimization of this HPLC method can be used during screening and validation. Amines and acids can be analyzed in the same run and retained by combination of polar organic mode, cation-exchange and anion-exchange modes. Various buffers within specified pH can be employed (ammonium formate, ammonium acetate, sodium phosphate, etc.).
Application Notes: Neurotransmitters DOPAC, homovanillic acid and dopamine were separated by mixed-mode chromatography on Primesep 100 and Primesep 200 HPLC columns. The method can be used for quantification of neurotransmitters with LC/MS compatible conditions. The compounds are retained by combination of reversed-phase, ion-exchange or ion-exclusion mechanisms. The retention time and selectivity of separation can be adjusted by variation of amount of acetonitrile, buffer pH and buffer concentration.
Application Columns: Primesep 100, Primesep 200
Application compounds: Dopac, Homovanillic Acid, Dopamine
Detection technique: UV, LC/MS, ELSD/CAD
Homovanillic and vanilmandelic acid are major catecholamine pathway metabolites. VMA and HVA can be found in urine along with other metabolites. Homovanillic and vanilmandelic acids were separated by combination of weak reversed-phase and anion-exchange mechanisms on the core-shell column. This method can be used for analysis of hydrophilic acidic compounds with LC. MS compatible conditions. Both compounds elute with a good peak shape. Retention time is controlled by amount of acetonitrile, buffer concentration, and buffer pH. Stationary phase does not change its ionization state with the change of buffer pH, but ionization state of acidic compounds is greatly affected by buffer pH.