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Concomitant oxygen‐18 enrichment in commercial carbon‐13 labelled urea
Author(s) -
Iida Katsumi,
Chiyoda Takeshi,
Kajiwara Masahiro
Publication year - 1996
Publication title -
journal of labelled compounds and radiopharmaceuticals
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 47
eISSN - 1099-1344
pISSN - 0362-4803
DOI - 10.1002/(sici)1099-1344(199612)38:12<1133::aid-jlcr935>3.0.co;2-#
Subject(s) - chemistry , urea , oxygen , carbon fibers , carbon 14 , radiochemistry , concomitant , nuclear chemistry , environmental chemistry , organic chemistry , medicine , nuclear physics , physics , materials science , composite number , composite material
By mass spectroscopy, 50‐fold oxygen‐18 enrichment over natural abundance was observed in commercial 13 C‐urea (99 atom % 13 C) synthesized from 13 C‐carbon monoxide that had been 13 C‐enriched by cryogenic distillation. In contrast, 13 C‐urea synthesized from 13 C‐potassium cyanide (a 13 C‐labelled compound having no oxygen atom) showed the natural abundance level of oxygen‐18.