title: Simultaneous measurement of lecithin, sphingomyelin, phosphatidylglycerol, phosphatidylinositol, phosphatidylethanolamine, and phosphatidylserine in amniotic fluid.
abstract: A one-dimensional thin-layer chromatographic method is described by which the ratios and proportions of lecithin, sphingomyelin, phosphatidylglycerol, phosphatidylinositol, phosphatidylethanolamine, and phosphatidylserine in amniotic fluid may be simultaneously determined. Commercial chromatographic plates, 10 X 7.5 cm, pretreated with cupric chloride, are used. The solvent system is chloroform/methanol/ammonium hydroxide (30/17/1.5 by vol). The plates are sprayed with a cupric acetate (350 g/L)/phosphoric acid (80 mL/L) reagent and charred on a hot plate to make the phospholipids visible. The percentage of each phospholipid present is determined by direct reflectance or transmission densitometry. The correlation coefficients for the lecithin/sphingomyelin, phosphatidylinositol/sphingomyelin, and phosphatidylglycerol/sphingomyelin ratios of the two scanning methods are 0.971, 0.980, and 0.955, respectively, for between-day analyses.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D002855:Chromatography, Thin Layer / Q000379:methods; D002908:Chronic Disease; D005260:Female; D005865:Gestational Age; D006801:Humans; D007674:Kidney Diseases / Q000378:metabolism; D010713:Phosphatidylcholines / Q000032:analysis*; D010714:Phosphatidylethanolamines / Q000032:analysis*; D010715:Phosphatidylglycerols / Q000032:analysis*; D010716:Phosphatidylinositols / Q000032:analysis*; D010718:Phosphatidylserines / Q000032:analysis*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000378:metabolism; D012016:Reference Values; D013109:Sphingomyelins / Q000032:analysis*
chemical_list: D010713:Phosphatidylcholines; D010714:Phosphatidylethanolamines; D010715:Phosphatidylglycerols; D010716:Phosphatidylinositols; D010718:Phosphatidylserines; D013109:Sphingomyelins