Table 2. Experimental Values of the Isotopic Composition of δ13C of myo- and scyllo-Inositol and Variation between the Two δ13C in Authentic Samples of CRM and in Samples from the Market.
| sample | geographical origin | δ13C scyllo-inositol (‰, vs V-PDB) | δ13C myo-inositol (‰, vs V-PDB) | δ13C scyllo – δ13C myo | myo-inositol (mg/kg) | scyllo-inositol (mg/kg) | ratio (myo-inositol/scyllo-inositol) | |
|---|---|---|---|---|---|---|---|---|
| authentic CRM samples | A | Puglia | –28.6 | –28.2 | –0.4 | 1650 | 260 | 6 |
| B | Italy | –28.6 | –26.2 | –2.4 | 1420 | 230 | 6 | |
| C | Italy | –28.6 | –29.4 | 0.8 | 1300 | 150 | 9 | |
| D | Italy | –28.2 | –29.4 | 1.2 | 1350 | 210 | 6 | |
| E | Italy | –27.0 | –27.4 | 0.4 | 1470 | 250 | 6 | |
| F | Italy | –27.0 | –28.2 | 1.2 | 1760 | 270 | 7 | |
| G | Italy | –26.6 | –29.0 | 2.4 | 1310 | 200 | 7 | |
| H | Italy | –25.0 | –25.8 | 0.8 | 1510 | 180 | 8 | |
| I | Sicily | –25.0 | –26.2 | 1.2 | 1790 | 210 | 9 | |
| mean | –27.2 | –27.8 | 0.6 | |||||
| SD | 1.5 | 1.4 | 1.3 | |||||
| minimum | –28.6 | –29.4 | –2.4 | |||||
| maximum | –25.0 | –25.8 | 2.4 | |||||
| market’s CRM | L | Italy | –23.4 | –25.8 | 2.4 | 1010 | 160 | 6 |
| M | Italy | –22.2 | –27.8 | 5.6 | 1550 | 220 | 7 | |
| N | Italy | –21.8 | –27.8 | 6.0 | 1340 | 190 | 7 | |
| O | Spain | –21.8 | –27.4 | 5.6 | 2020 | 270 | 7 | |
| P | Spain | –19.0 | –23.4 | 4.4 | 820 | 110 | 7 | |
| Q | Spain | –25.0 | –21.0 | –4.0 | 800 | 110 | 7 | |
| R | Spain | –25.8 | –25.8 | 0.0 | 930 | 130 | 7 |