固态 P-MAS-NMR 光谱法测定宠物食品中的磷形态。

Speciation of Phosphorus in Pet Foods by Solid-State P-MAS-NMR Spectroscopy.

机构信息

Nuclear Magnetic Resonance Facility, University of California at Davis, Davis, California 95616, United States.

Waltham Petcare Science Institute, Mars Petcare, Freeby Lane, Waltham on the Wolds LE14 4RT, U.K.

出版信息

J Agric Food Chem. 2023 Jun 7;71(22):8602-8612. doi: 10.1021/acs.jafc.2c07339. Epub 2023 May 25.

DOI:10.1021/acs.jafc.2c07339

PMID:37227713

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10251508/

Abstract

Solid-state magic angle spinning P NMR spectroscopy is used to identify and quantify phosphorus-containing species in pet foods. The measurement is challenging due to the long spin-lattice relaxation times (s). Data acquisition times are shortened by acquiring data with a tip angle smaller than 90° and shortening the repetition time. However, the spin-lattice relaxation times (s) of the different P compounds are quite different, necessitating a separate measurement for each compound in the pet food. Knowledge of is used to calculate the relative amount of P in the samples. Samples of known concentration are also measured, enabling the quantitative measurement of total phosphorus content.

摘要

采用固态魔角旋转 P NMR 光谱法来鉴定和定量分析宠物食品中的含磷物质。由于自旋晶格弛豫时间（T1）较长，因此测量具有挑战性。通过使用小于 90°的探头角和缩短重复时间来采集数据，可以缩短数据采集时间。然而，不同磷化合物的自旋晶格弛豫时间（T1）差异很大，因此需要对宠物食品中的每种化合物进行单独测量。利用 T1 的知识可以计算出样品中磷的相对含量。还测量了已知浓度的样品，从而能够对总磷含量进行定量测量。