The authors had reported the determination of ephedrine by osillopolarography.In acetate buffer（pH 4.0） ephedrine reacted with nitrite to form N-nitrosoephedrine.The reaction needed only 2 minutes with a boiling wat...The authors had reported the determination of ephedrine by osillopolarography.In acetate buffer（pH 4.0） ephedrine reacted with nitrite to form N-nitrosoephedrine.The reaction needed only 2 minutes with a boiling water bath.After removing excessive nitrite,N-nitrosoephedrine gave a well polarographic reductive wave at -0.82V（vs.SCE） in acidic medium.The linear relationship between the concentrations of ephedrine and the peak currents of the osillopolarographic wave was proportional in the range of 0.10～200×10-6 （g/mL.）The method was sensitive,rapid and simple.It had been applied to determine ephedrine in pharmaceuticals with satisfactory results.展开更多
文摘The authors had reported the determination of ephedrine by osillopolarography.In acetate buffer（pH 4.0） ephedrine reacted with nitrite to form N-nitrosoephedrine.The reaction needed only 2 minutes with a boiling water bath.After removing excessive nitrite,N-nitrosoephedrine gave a well polarographic reductive wave at -0.82V（vs.SCE） in acidic medium.The linear relationship between the concentrations of ephedrine and the peak currents of the osillopolarographic wave was proportional in the range of 0.10～200×10-6 （g/mL.）The method was sensitive,rapid and simple.It had been applied to determine ephedrine in pharmaceuticals with satisfactory results.
