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Zhou D, Wang X, Zou J, Song J, Su P, Yang Y, Wu L. Determination of [Glu 1]-fibrinopeptide B purity by gas chromatography - isotope dilution mass spectrometry. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:1741-1747. [PMID: 38372017 DOI: 10.1039/d3ay02114a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/20/2024]
Abstract
The present work assessed the purity of [Glu1]-fibrinopeptide B (GFB) as a model peptide using gas chromatography - isotope dilution mass spectrometry. GFB and various isotope-labeled amino acids were hydrolyzed in HCl and then derivatized using optimized procedures. The primary impurity in GFB was also identified and used to correct the final result. A method repeatability of 0.5% was achieved and linear calibrations were obtained for five amino acids. The LOD and LOQ were 0.041 to 0.096 μg g-1, and 0.16 to 0.56 μg g-1, respectively. The purity of GFB was found to be (0.715 ± 0.012) g g-1. This technique exhibited comparable accuracy to that obtainable from liquid chromatography - isotope dilution mass spectrometry but at lower cost. This method could be employed as a reference technique or in fields such as clinical diagnostics or bio-pharmaceutical peptide purity analysis.
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Affiliation(s)
- Dongmei Zhou
- National Institute of Metrology, P.R. China, No. 18, North Third Ring East Road, Beijing, China.
| | - Xianxia Wang
- National Institute of Metrology, P.R. China, No. 18, North Third Ring East Road, Beijing, China.
| | - Jun Zou
- China Quality Certification Centre, Building 3, Zone 9, No. 188, South Fourth Ring West Road, Fengtai District, Beijing, China.
| | - Jiayi Song
- Beijing University of Chemical Technology, North Third Ring Road 15, Chaoyang District, Beijing, China.
| | - Ping Su
- Beijing University of Chemical Technology, North Third Ring Road 15, Chaoyang District, Beijing, China.
| | - Yi Yang
- Beijing University of Chemical Technology, North Third Ring Road 15, Chaoyang District, Beijing, China.
| | - Liqing Wu
- National Institute of Metrology, P.R. China, No. 18, North Third Ring East Road, Beijing, China.
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Graham TR, Chun J, Schenter GK, Zhang X, Clark SB, Pearce CI, Rosso KM. 27 Al NMR diffusometry of Al 13 Keggin nanoclusters. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2022; 60:226-238. [PMID: 34536037 DOI: 10.1002/mrc.5218] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 08/01/2021] [Accepted: 09/13/2021] [Indexed: 06/13/2023]
Abstract
Although nanometer-sized aluminum hydroxide clusters (i.e., ϵ-Al13 , [Al13 O4 (OH)24 (H2 O)12 ]7+ ) command a central role in aluminum ion speciation and transformations between minerals, measurement of their translational diffusion is often limited to indirect methods. Here, 27 Al pulsed field gradient stimulated echo nuclear magnetic resonance (PFGSTE NMR) spectroscopy has been applied to the AlO4 core of the ϵ-Al13 cluster with complementary theoretical simulations of the diffusion coefficient and corresponding hydrodynamic radii from a boundary element-based calculation. The tetrahedral AlO4 center of the ϵ-Al13 cluster is symmetric and exhibits only weak quadrupolar coupling, which results in favorable T1 and T2 27 Al NMR relaxation coefficients for 27 Al PFGSTE NMR studies. Stokes-Einstein relationship was used to relate the 27 Al diffusion coefficient of the ϵ-Al13 cluster to the hydrodynamic radius for comparison with theoretical simulations, dynamic light scattering from literature, and previously published 1 H PFGSTE NMR studies of chelated Keggin clusters. This first-of-its-kind observation proves that 27 Al PFGSTE NMR diffusometry can probe symmetric Al environments in polynuclear clusters of greater molecular weight than previously considered.
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Affiliation(s)
- Trent R Graham
- Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Jaehun Chun
- Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Gregory K Schenter
- Pacific Northwest National Laboratory, Richland, WA 99354, USA
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA
| | - Xin Zhang
- Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Sue B Clark
- Pacific Northwest National Laboratory, Richland, WA 99354, USA
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA
| | - Carolyn I Pearce
- Pacific Northwest National Laboratory, Richland, WA 99354, USA
- Department of Crop & Soil Sciences, Washington State University, Pullman, WA 99164, USA
| | - Kevin M Rosso
- Pacific Northwest National Laboratory, Richland, WA 99354, USA
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Vuckovic I, Denic A, Charlesworth MC, Šuvakov M, Bobart S, Lieske JC, Fervenza FC, Macura S. 1H Nuclear Magnetic Resonance Spectroscopy-Based Methods for the Quantification of Proteins in Urine. Anal Chem 2021; 93:13177-13186. [PMID: 34546699 DOI: 10.1021/acs.analchem.1c01618] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We described several postprocessing methods to measure protein concentrations in human urine from existing 1H nuclear magnetic resonance (NMR) metabolomic spectra: (1) direct spectral integration, (2) integration of NCD spectra (NCD = 1D NOESY-CPMG), (3) integration of SMolESY-filtered 1D NOESY spectra (SMolESY = Small Molecule Enhancement SpectroscopY), (4) matching protein patterns, and (5) TSP line integral and TSP linewidth. Postprocessing consists of (a) removal of the metabolite signals (demetabolization) and (b) extraction of the protein integral from the demetabolized spectra. For demetabolization, we tested subtraction of the spin-echo 1D spectrum (CPMG) from the regular 1D spectrum and low-pass filtering of 1D NOESY by its derivatives (c-SMolESY). Because of imperfections in the demetabolization, in addition to direct integration, we extracted protein integrals by the piecewise comparison of demetabolized spectra with the reference spectrum of albumin. We analyzed 42 urine samples with protein content known from the bicinchoninic acid (BCA) assay. We found excellent correlation between the BCA assay and the demetabolized NMR integrals. We have provided conversion factors for calculating protein concentrations in mg/mL from spectral integrals in mM. Additionally, we found the trimethylsilyl propionate (TSP, NMR standard) spectral linewidth and the TSP integral to be good indicators of protein concentration. The described methods increase the information content of urine NMR metabolomics spectra by informing clinical studies of protein concentration.
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Affiliation(s)
- Ivan Vuckovic
- Metabolomics Core, Mayo Clinic, Rochester, Minnesota 55905, United States
| | - Aleksandar Denic
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota 55905, United States
| | | | - Milovan Šuvakov
- Department of Quantitative Health Sciences, Center for Individualized Medicine, Mayo Clinic, Rochester, Minnesota 55905, United States
| | - Shane Bobart
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota 55905, United States
| | - John C Lieske
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota 55905, United States
| | - Fernando C Fervenza
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota 55905, United States
| | - Slobodan Macura
- Metabolomics Core, Mayo Clinic, Rochester, Minnesota 55905, United States.,Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota 55905, United States
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