This chapter describes two different methods using reversed-phase HPLC with electrochemical detection on a boron-doped diamond (BDD) working electrode for the direct, routine, sensitive and simultaneous measurement of a number of aminothiols, disulfides, and thioethers, in either plasma or tissue homogenates.

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A method for the HPLC separation of phosphatidylglycerol (PG), phosphatidylinositol (PI), phosphatidylcholine (PC), and sphingornyelin (SPH) was achieved using five in-series columns packed with LiChrosorb, Partisil, and p-Porasil adsorbents, a solvent mixture of chloroform/methanol/ammonium hydroxide (50 : 36 : 6.7, by volume), and a Pye LCM2 Moving Wire (FID) detector. The same phospholipid mixture was also separated using four p-Porasil columns with the same eluent and detector. The latter conditions were found to be suitable for the analysis of phospholipids obtained after centrifuging, extraction, and precipitation of surface-active lipid components of patient amniotic fluid collected at amniocentesis section. The lecithin/ sphingomyelin (US) ratios, determined by the HPLC method, correlated well with those determined by the TLC technique in four normal pregnancies, whereas results of shake tests did not correlate too well with L/S ratios determined by the above two chromatographic methods. Besides the lecithin/ sphingomyelin ratio, the present method was able to supply additional information: the concentrations of phosphatidylglycerol and phosphatidylinositol, for prediction of fetal lung maturity, and the palmitic acid content of amniotic fluid phosphatidyicholine. 0344-71 38/80/080400-05$01 .OO 0 1980 Dr. Alfred Huethig Publishers