title: The application of HPLC and microprobe NMR spectroscopy in the identification of metabolites in complex biological matrices.
abstract: Nuclear magnetic resonance (NMR)-based metabolomics can be used directly to identify a variety of metabolites in biological fluids and tissues. Metabolite analysis is an important part of life science and metabolomics research. However, the identification of some metabolites using NMR spectroscopy remains a big challenge owing to low abundance or signal overlap. It is important to develop a method to measure these compounds accurately. Two-dimensional NMR spectroscopy, metabolite prediction software packages, and spike-in experiments with authentic standards are often used to solve these problems, but they are costly and time-consuming. In this study, methods were developed to identify metabolites in complex biological mixtures using both high-performance liquid chromatography (HPLC) and off-line microprobe NMR spectroscopy. With use of these methods, 83 and 73 metabolites were identified in Sprague Dawley rat urine and feces, respectively. Among them, 40 and 45 metabolites, respectively, could not be identified with traditional NMR methods. Our research revealed that the combination of HPLC and NMR techniques could significantly improve the accuracy of trace and overlapped metabolite identification, while offering an effective and convenient approach to identify potential biomarkers in complex biological systems.
authors: State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China.
authors: Zhaoxia
authors: Z
authors: Miao
authors: Mengxia
authors: M
authors: Jin
authors: Xia
authors: X
authors: Liu
authors: Wei
authors: W
authors: Guo
authors: Xiangju
authors: X
authors: Jin
authors: Hongyue
authors: H
authors: Liu
authors: Yinghong
authors: Y
authors: Wang
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005243:Feces; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008297:Male; D055432:Metabolomics / Q000379:methods*; D017207:Rats, Sprague-Dawley; D016482:Urinalysis / Q000379:methods*