Can I use mass spectrometry to determine 13C/12C isotope ratio of glucose with a precision and reproducibility of 0.5 per mille ?

I know it can be done by first converting glucose to carbon dioxide and using an isotope-ratio MS (or by Isotope Ratio Infrared Spectroscopy). But can I do it by recording mass spectra of glucose?

30 August 2016 5,229 4 View