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Derivatization with N-methyl-N-(tert-butyldimethylsilyl)trifluoroacetamide (MTBSTFA) was used for gas chromatography–mass spectrometry (GC–MS) analysis of citrulline and ornithine. Aqueous 50μl aliquots at 1 and 10mM concentrations were dried and derivatized separately, and 70eV electron ionization or CH 4 positive chemical ionization were used. Ornithine produced a single GC peak. Physiological...
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