1H NMR用于对乳清和WPC-80进行比较代谢分析
Ingrid Sousa1, Gaia Meoni2, Leonardo Tenori2
1Department of Agronomy, Food, Natural Resources, Animals and Environment, University of Padua, 35020 Legnaro, Italy.
Metabolites
|December 24, 2025
概括
质子核磁共振 (1H NMR) 揭示了乳清和乳清蛋白缩物 (WPC-80) 中不同的代谢物概况. 加工大大改变了这些乳制品副产品的成分,影响了它们的营养和功能性质.
科学领域:
- 乳制品科学 乳制品科学
- 代谢学 代谢学 代谢学
- 分析化学 分析化学
背景情况:
- 代谢物是食品质量和健康影响的关键指标.
- 质子核磁共振 (1H NMR) 光谱是乳制品行业代谢物分析的强大工具.
- 乳清和乳清蛋白缩物 (WPC-80) 是具有独特成分的重要乳制品副产品.
研究的目的:
- 用1H NMR光谱学描述和比较乳清和WPC-80的代谢组成.
- 为了确定特定的代谢物,使乳清与WPC-80有所区别.
- 了解加工对乳清制品代谢概况的影响.
主要方法:
- 从帕米贾诺-雷贾诺奶制品公司采集了五个乳清和四个WPC-80样本.
- 应用1HNMR光谱法用于代谢物分析.
- 统计分析包括曼·惠特尼U测试,主要组件分析 (PCA) 和部分最小平方差分分析 (PLS-DA).
主要成果:
- 与WPC-80相比,乳清呈现出高水平的二甲基硫,糖酸盐,酸盐,烟酸盐和乳糖.
- 在WPC-80中,希斯提丁,甲酸盐,葡萄糖+葡萄糖-6-酸盐,酸盐和胆的度显著更高.
- 像hippurate,valine,乳酸盐 + threonine和uracil这样的代谢物仅在乳清中检测到,这表明加工引起的变化.
结论:
- 从Parmigiano Reggiano乳清中加工WPC-80引入了显著的代谢差异.
- 鉴定到的代谢差异为乳清制品的营养和功能特性提供了洞察力.
- 这些知识可以引导开发创新的乳制品成分和功能性食品,以获得工业和健康的好处.
相关概念视频
01:07Proton (¹H) NMR: Chemical Shift
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Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei...
Absorption signals of all the protium nuclei...
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01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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00:48¹H NMR of Labile Protons: Deuterium (²H) Substitution
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This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
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01:13¹H NMR: Complex Splitting
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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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