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. 2022 Sep 7;36(21):e9380. doi: 10.1002/rcm.9380

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© 2022 The Authors. Rapid Communications in Mass Spectrometry published by John Wiley & Sons Ltd.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Weight of samples plotted against their measured atomic C/N ratios. Open circles represent unsolubilised dentine samples; filled circles represent solubilised dentine samples. (A) Samples sent to Iso‐Analytical for CN analysis. (B) Samples sent to SFU for CNS analysis. Blue dash‐dotted lines indicate the theoretical ideal threshold of atomic C/N ratio for quality control at 3.3. Red line in (A) indicates the recommended analytical weight threshold for isotope analysis at 0.3 mg [Color figure can be viewed at wileyonlinelibrary.com]