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, Quantification of OS in biological matrices after partial or total evaporation. The plasma concentrations of 13 different OS were measured by GC-MS. These included 5,6a-EC, 5,6b-EC, CT and OCDO. Samples were prepared according to either classical methodologies (total evaporation) or by directly injecting the crude product of the TMS derivatization reaction for GC/MS analysis (partial evaporation). A) Results of the GC/MS quantification. B) Graph showing the percentage enrichment between the two procedures
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