碳和同位素组成的复制日式饮食的复制饮食的日本
1Faculty of Life Sciences, Toyo University, Asaka, Saitama, Japan.
Rapid communications in mass spectrometry : RCM
|February 20, 2025
概括
在日本测量了整个饮食中的稳定同位素比 (δ13C和 δ15N). 虽然海鲜摄入与较高的δ15N相关,但其在日本饮食同位素值中的作用需要进一步调查.
科学领域:
- 营养科学 营养科学
- 稳定的同位素生态学
- 人类饮食研究 人类饮食研究
背景情况:
- 稳定的同位素比 (δ13C和 δ15N) 对于饮食和营养研究至关重要,但对整个饮食的测量很少.
- 验证基于同位素的饮食分析需要从整个饮食中获得全面的同位素数据.
研究的目的:
- 测量来自日本的重复饮食样本中的碳和稳定同位素比率 (δ13C和 δ15N).
- 研究基于性别,年龄和海鲜消费的饮食同位素比例的潜在变化.
主要方法:
- 在2016-2017年期间,从日本成年人 (65名男性,85名女性) 收集了150个重复的饮食样本.
- 使用元素分析仪-同位素比质谱法测量 δ13C和 δ15N.
主要成果:
- 平均饮食 δ13C 为 -24.3 ‰, δ15N 为 3.58 ‰,没有显著的性别或年龄差异.
- 含有海鲜的饮食显示,与没有海鲜的饮食相比,含有海鲜的饮食显著更高的δ15N (3.60‰).
- 自20世纪90年代以来,观察到日本饮食中δ15N的下降趋势,与减少的海鲜消费保持一致,但老年人的饮食尽管摄入海鲜量较高,但没有增加δ15N.
结论:
- 海鲜作为日本饮食N的主要决定因素的直接影响仍然不确定.
- 需要进一步研究分析已知定量成分的饮食,以充分了解影响饮食 δ 值的因素.
更多相关视频
12:10Stable Isotopic Profiling of Intermediary Metabolic Flux in Developing and Adult Stage Caenorhabditis elegans
Published on: February 27, 2011
13.5K
10:16Design 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
21.9K
相关概念视频
Mass Spectrometry: Isotope Effect
1.9K
Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the difference between the molecular mass. Furthermore, the intensity of these signals is dependent on the...
1.9K
¹³C NMR: ¹H–¹³C Decoupling
994
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
994
Overview of Nitrogen Metabolism
7.8K
Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
7.8K
Carbon-13 (¹³C) NMR: Overview
5.5K
Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
5.5K
The Carbon Cycle
36.9K
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
36.9K
Radioactive Decay and Radiometric Dating
33.0K
Radioactivity is a spontaneous disintegration of an unstable nuclide and is a random process, as all the nuclei in the sample do not decay simultaneously. The number of disintegrations per unit time is called the activity (A), which is directly proportional to the number of nuclei in the sample. The decay constant (λ) is an average probability of decay per nucleus in unit time.
33.0K
