Table 3. Isotope Information Summary of Vanillin from Different Sources.
| vanillin source | pMC (±0.2%)a | activity (±0.03 dpm/g)b | δ13C (‰)c | δ13C (‰)c literature values50 |
|---|---|---|---|---|
| 4-methyl guaiacol | 104.11 | 14.12 | –25.2 | |
| eugenol | 104.18 | 14.13 | –31.6 | –31.7 to −29.951 |
| ferulic acid | 102.13 | 13.85 | –37.0 | –37.9 to −35.152 |
| lignin | 114.43 | 15.52 | –27.8 | –28.7 to −26.953 |
| vanilla | 99.93 | 13.46 | –19.6 | –22.2 to −17.8 |
| commercial | <0.44 | 0 | –25.5 |
a
pMC = ASample/AStandard × 100%, where ASample is the radioactivity ratio of the sample (dpm/g) and AStandard is the radioactivity ratio of standard reagent (13.56 dpm/g).
b
Activity, radioactivity ratio; dpm/g, decay number of 1 g carbon in the sample (A).
c
The 13C isotope ratio
is calculated as
where RSample is
the stable C isotope ratio 13C/12C in the sample
to be detected, and RStandard is the stable
C isotope ratio 13C/12C in the standard sample.
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1 |