Aqueous solutions (10 mg/ml) of each neurotransmitter [()-
epinephrine, ()-norepinephrine, dopamine, serotonin and gaminobutyric
acid] were added to a 2H4MBZA methanolic stock
solution so that both reactants were present in equimolar
concentrations with methanol proportion never exceeding 10%.
The mixture was left to react at 37 8C for 16 h and eventual reaction
products were detected by TLC.