Integrated gas chromatography-mass spectrometry.
D002079:Butter; D002197:Capillary Action; D002849:Chromatography, Gas / Q000295:instrumentation*; D003201:Computers; D005227:Fatty Acids / Q000032:analysis; D005243:Feces / Q000032:analysis; D005898:Glass; D006371:Helium; D006801:Humans; D007223:Infant; D013058:Mass Spectrometry / Q000295:instrumentation*; D008433:Mathematics; D008970:Molecular Weight; D011453:Prostaglandins / Q000032:analysis; D013256:Steroids / Q000032:analysis; D013696:Temperature; D013997:Time Factors
D005227:Fatty Acids; D011453:Prostaglandins; D013256:Steroids; D006371:Helium; D002079:Butter