in this simple and rapid `` '' high-performance '' '' liquid-chromatographic method for determining nitrazepam in plasma , serum , or whole blood , the sample at ph 7.4 is extracted into diethyl ether with an internal standard ( prazepam ) , chromatographed , and detected at 280 nm with a fixed-wavelength ultraviolet detector .
C0032105
n plas
C0229671
, ser