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LC-MS/MSを用いたビタミンA安定同位体トレーサーの分析
Georg Lietz1, Dan Astley2, Alice Goddard3
1Human Nutrition and Exercise Research Centre, Newcastle University; georg.lietz@newcastle.ac.uk.
Journal of visualized experiments : JoVE
|January 19, 2026
まとめ
レチノール同位体希釈(RID)法は、質量分析法を用いてビタミンAレベルを正確に測定する。この技術は、ヒトの総体内貯蔵量(TBS)推定の速度と感度を高める。
科学分野:
- 生化学
- 分析化学
- ヒト栄養学
背景:
- ビタミンAの総体内貯蔵量(TBS)の正確な評価は、人間の健康にとって非常に重要です。
- レチノール同位体希釈(RID)法は、血漿同位体比の正確な測定に依存しています。
研究 の 目的:
- 標識および非標識レチノイドを分析するための、高速、高感度、同時LC-MS/MS法を説明すること。
- 長い抽出および誘導体化を回避して、RID法のためのレチノールの定量化を最適化すること。
主な方法:
- 標識(13Cまたは2H)レチノールを用いた安定同位体希釈。
- 大気圧化学イオン化(APCI)を用いた液体クロマトグラフィー-タンデム質量分析(LC-MS/MS)。
- レチノール分離のための溶媒抽出を含む血漿サンプル調製。
主要な成果:
- オンカラムで6 fmolという低検出限界で高感度を達成しました。
- LC-MS/MSにより、標識および非標識レチノイドの同時分析が可能になり、レチノールと酢酸レチノールを区別できます。
- 血漿から内因性および標識レチノールの分離と定量に成功しました。
結論:
- LC-MS/MSは、RID法におけるレチノール定量のための効率的かつ高感度なアプローチを提供します。
- 記載された方法は、ビタミンA総体内貯蔵量(TBS)の推定の精度と効率を向上させます。
- この分析戦略は、ビタミンAの状態に関連する栄養評価と公衆衛生戦略の改善をサポートします。
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