ハチミツの原産地をストロンチウム同位体で判別（Analysis Explores Honey, Strontium Isotopes to Determine Geographic Origin）

2025-09-25 パシフィック・ノースウェスト国立研究所（PNNL）

＜関連情報＞

• https://www.pnnl.gov/publications/analysis-explores-honey-strontium-isotopes-determine-geographic-origin
• https://www.sciencedirect.com/science/article/abs/pii/S0889157525006374

ストロンチウム同位体分析による蜂蜜の地理的起源の特定：ラトビアとインドの測定値とモデル予測との比較による実現可能性調査 Geographic source attribution of honey by strontium isotope analyses: Latvia and India measurements compared to model predictions in a feasibility study

Lisa B. Kant, Megan K. Nims, Abdullah D. Shouaib, Kelly C. McHugh, Tyler D. Schlieder, Eirik J. Krogstad, Elizabeth H. Denis
Journal of Food Composition and Analysis  Available online: 24 May 2025
DOI:https://doi.org/10.1016/j.jfca.2025.107822

Highlights

• Measured ⁸⁷Sr/⁸⁶Sr of honey from known locations in USA, Latvia, and India.
• Significant difference between mean ⁸⁷Sr/⁸⁶Sr in honey from Latvia and India.
• The ⁸⁷Sr/⁸⁶Sr of the honey compared well with previously published regional data.
• Predicted ⁸⁷Sr/⁸⁶Sr based on Bataille et al. (2020) random forest isoscape model.
• More research on how Sr is incorporated into honey is needed to improve predictions.

Abstract

Strontium isotope ratios (⁸⁷Sr/⁸⁶Sr) can be used to determine the geographic origin of agricultural products. In this feasibility study we measured the ⁸⁷Sr/⁸⁶Sr of honey samples from Richland, WA, USA, Latvia, and India, and compared the results to published ⁸⁷Sr/⁸⁶Sr from surrounding areas and values predicted based upon a random forest isoscape model from Bataille et al. (2020). While the ⁸⁷Sr/⁸⁶Sr of the honey samples compared well with previously published data, the model did not accurately predict the ⁸⁷Sr/⁸⁶Sr of the honey samples, demonstrating that further refinement of the model would be beneficial. Because Sr cycling in terrestrial ecosystems is complex, the ⁸⁷Sr/⁸⁶Sr of honey is likely to reflect several sources (e.g., nectar, surface water, dust) and may change over time. In order to accurately predict the ⁸⁷Sr/⁸⁶Sr of honey, models must consider local geology, ecology, and bee behavior. Additional research examining how Sr is incorporated into honey is needed to inform models.