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Updated: Aug 11, 2026

Design and Operation of a Continuous 13C and 15N Labeling Chamber for Uniform or Differential, Metabolic and Structural, Plant Isotope Labeling
Published on: January 16, 2014
Natural 13C/12C ratio variations in human populations
Human tissue samples reveal variations in carbon-13 to carbon-12 (13C/12C) isotope ratios, linked to diet. These findings are crucial for understanding human metabolism and biomedical research.
Area of Science:
- Biogeochemistry
- Human Physiology
- Stable Isotope Analysis
Background:
- Naturally occurring carbon isotope ratios (13C/12C) in human tissues reflect dietary intake.
- Understanding these baseline variations is essential for interpreting biomedical data.
Purpose of the Study:
- To present baseline data on 13C/12C ratios in human tissues from diverse populations.
- To explore the relationship between diet and tissue isotope composition.
- To assess the implications for biomedical investigations.
Main Methods:
- Analysis of endogenous tissue samples (brain, liver, lung) from autopsy cases.
- Determination of 13C/12C ratios using mass spectrometry.
- Comparison of data from Long Island (New York, USA), Bergen (Norway), and Lucerne (Switzerland).
Main Results:
- Significant differences in average delta13C values were observed across populations.
- Long Island samples showed a distinct average delta13C of -16.2 +/- 1.0.
- Samples from Switzerland (-20.6 +/- 1.0) and Norway (-20.7 +/- 1.0) exhibited similar, lower delta13C values.
Conclusions:
- Observed variations in human tissue 13C/12C ratios are primarily attributed to differences in regional diets.
- These dietary-influenced isotopic signatures have important implications for interpreting results in biomedical research, particularly in fields like metabolomics and nutritional studies.
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