Carbon-13 fractionation in the oxidation of propionate of natural isotopic composition with permanganate and manganate

by Zieliñski, Mieczyslaw; Fry, Arthur J.; Zieliñska, A.; Ogrinc, N.; Papiernik-Zieliñska, H.; Kobal, I.

Carbon-13 fractionation in the oxidation of sodium propionate of natural isotopic composition with permanganate in water solution and with manganate in alkaline solution has been investigated and compared with carbon-14 kinetic isotope effects in the oxidation of (3-C-14) - and (2-C-14) propionate with permanganate. The experimental carbon-13 isotope ratios, R(C-13/C-12)(cumul.), corrected for dilution of R(C-13/C-12), by carbon dioxide derived from all external sources and by carbon dioxide derived from (C-1) and from (C-3) of propionate at its complete and partial oxidations, used for calculation of C-13 alpha KIE, provided the carbon-13 isotope effects corresponding to initial oxidation of alpha carbon, which correlate well with (2-C-14) KIE determined previously, (k(12)/k(13) -1)x100 congruent to 1/2(k(12)/k(14) -1)x100 congruent to 1/2(4.6+/-0.3) at 373 K. The possibility of extension of isotope ratio measurements, using modern double collector mass spectrometers, from geochemical, biomedical, agriculture and environmental research to carbon-13 isotope effects studies in chemical organic reactions is briefly discussed.

Journal
Nukleonika
Volume
45
Issue
4
Year
2000
Start Page
221
URL
http://www.ichtj.waw.pl/ichtj/nukleon/back/full/vol45_2000/v45n4p221f.pdf
ISBN/ISSN
1508-5791; 0029-5922