Table I. Summarized data of possible uses of stable isotopes in the analysis of other molecule classes.
A detailed analysis of other components of biomolecules, especially 14N/15N and 34S/36S stable isotope pairs, is given. The relative differences between the light and heavy slopes are similar to or larger than those for 12C/13C but are negative and would therefore result in a negative slope. Nonetheless, it is especially clear that 15N could be used for an analogous study design.
| Stable isotopes | Mr | ΔMr | ΔMr − 1 (except S, 4) | Slope direction |
|---|---|---|---|---|
| 12C | 12.000000 | 1.003355 | 0.003355 | Positive |
| 13C | 13.003355 | |||
| 14N | 14.003074 | 0.997035 | −0.002965 | Negative |
| 15N | 15.000109 | |||
| 32S | 31.972071 | 3.995010 | −0.004990 | Negative |
| 36S | 35.967081 |