the detection limit of the dmnps ether derivative of pgf2 alpha pfb ester was found to be 200 fg with a signal-to-noise ratio of 5 when monitoring the ion of m/z 653 ( [ m - 181 ] - ) in the high-resolution mode ( r = 2500 ) using ammonia as a reagent gas .
C0002607
ammonia
C0017110
gas