1
|
Maroto A, Fouque DJD, Lartia R, Memboeuf A. LC-MS accurate quantification of a tryptic peptide co-eluted with an isobaric interference by using in-source collisional purification. Anal Bioanal Chem 2023; 415:7211-7221. [PMID: 37864586 DOI: 10.1007/s00216-023-04989-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 10/01/2023] [Accepted: 10/04/2023] [Indexed: 10/23/2023]
Abstract
Interferences from isobaric and isomeric compounds represent a common problem in liquid chromatography coupled to mass spectrometry (LC-MS). In this paper, in-source purification and chromatographic separation were combined with the aim of identifying isobaric contamination and quantifying accurately a compound despite the presence of an isobaric co-eluted interference. This is achieved by totally fragmenting in-source the precursor ions of the isobaric interference providing then LC-pseudo-MS2 capability, which allows an accurate quantification without the need for optimizing the chromatographic conditions to separate the co-eluted interference. To illustrate this concept, mixtures of tryptic and non-tryptic peptides were used. The ratio of peak areas of the tryptic peptide and its isotopically labelled internal standard was used not only for quantification with an internal standard calibration curve but also to know (1) if an isobaric interference co-eluted with the tryptic peptide; and (2) what is the minimum cone voltage necessary to ensure the complete removal of isobaric interference. This strategy was applied to quantify the tryptic peptide of two standards with known concentrations and, intentionally contaminated with the isobaric interference. The confidence intervals of the concentrations calculated with the internal standard calibration curve were 8.0 ± 0.5 μM (prepared at 8.0 μM) and 15.7 ± 0.5 μM (prepared at 16.1 μM) that confirm the tryptic peptide can be correctly quantified by in-source purification without the need for improving the chromatographic separation from its isobaric interference.
Collapse
Affiliation(s)
- Alicia Maroto
- Univ Brest, CNRS, UMR 6521 CEMCA, F-29200, Brest, France
| | | | - Rémy Lartia
- Univ Grenoble-Alpes, CNRS, UMR 5250 DCM, F-38058, Grenoble, France
| | | |
Collapse
|
2
|
Jeanne Dit Fouque D, Maroto A, Memboeuf A. Structural analysis of a compound despite the presence of an isobaric interference by using in-source Collision Induced Dissociation and tandem mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2021; 56:e4698. [PMID: 33480458 DOI: 10.1002/jms.4698] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 12/14/2020] [Accepted: 12/17/2020] [Indexed: 06/12/2023]
Abstract
The presence of an isobaric contaminant can drastically affect MS and MS/MS patterns leading to erroneous structural and quantitative analysis, which is a real challenge in mass spectrometry. Herein, we demonstrate that MS and MS/MS structural analysis of a compound can be successfully performed despite the presence of an isobaric interference with as low as few millidaltons mass difference by using pseudo-MS3 . To this end, in-source collisional excitation (in-source CID) and the Survival Yield (SY) technique (energy-resolved collision induced dissociation MS/MS) were performed on two different source geometries: a Z-spray and an orthogonal spray (with a transfer capillary) ionization sources on two different mass spectrometers. By using soft ionization conditions, the SY curve for the mixture is a linear combination of the SY curves from the pure compounds demonstrating the presence of two components in the mixture. In the case of harsher ionization conditions, the SY curve of the mixture perfectly overlaps the SY curve from the pure analyte. This observation demonstrates the isobaric interference has been completely removed by in-source CID fragmentation, independently of the source design, leaving then the analyte precursor ions only. Therefore, by measuring the MS spectrum in harsh ionization conditions and according to SY criterium, the compound of interest can be made free from isobaric interference paving the way for, for example, unequivocal HPLC-MS as well as HPLC-MS/MS structural and quantitative analysis despite the presence of a co-eluting isobaric interference.
Collapse
Affiliation(s)
| | - Alicia Maroto
- Univ Brest, UMR UBO-CNRS 6521, Brest, F-29200, France
| | | |
Collapse
|
3
|
Fitzgerald B, Mahapatra S, Farmer DK, McNeil MR, Casero RA, Belisle JT. Elucidating the Structure of N1-Acetylisoputreanine: A Novel Polyamine Catabolite in Human Urine. ACS OMEGA 2017; 2:3921-3930. [PMID: 28782053 PMCID: PMC5537715 DOI: 10.1021/acsomega.7b00872] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 07/14/2017] [Indexed: 06/07/2023]
Abstract
An untargeted metabolomics approach was utilized to determine urinary metabolites that could serve as small-molecule biomarkers for treatment response to standard tuberculosis treatment. However, the majority of metabolites that most accurately distinguished patient samples at the time of diagnosis from those at 1 month after the start of therapy lacked structural identification. The detection of unknown metabolite structures is a well-known limitation of untargeted metabolomics and underscores a need for continued elucidation of novel metabolite structures. In this study, we sought to define the structure of a urine metabolite with an experimentally determined mass of 202.1326 Da, classified as molecular feature (MF) 202.1326. A hypothesized structure of N1-acetylisoputreanine was developed for MF 202.1326 using in silico tools and liquid chromatography-tandem mass spectrometry (LC-MS/MS). In the absence of a commercial standard, synthetic N1-acetylisoputreanine was generated using enzymatic and chemical syntheses, and LC-MS/MS was used to confirm the structure of MF 202.1326 as N1-acetylisoputreanine, a proposed terminal polyamine catabolite that had not been previously detected in biological samples. Further analysis demonstrated that N1-acetylisoputreanine and an alternative form of this metabolite, N1-acetylisoputreanine-γ-lactam, are both present in human urine and are likely end-products of polyamine metabolism.
Collapse
Affiliation(s)
- Bryna
L. Fitzgerald
- Mycobacteria
Research Laboratories, Department of Microbiology, Immunology and
Pathology, Colorado State University, 1682 Campus Delivery, Fort Collins, Colorado 80523, United States
| | - Sebabrata Mahapatra
- Mycobacteria
Research Laboratories, Department of Microbiology, Immunology and
Pathology, Colorado State University, 1682 Campus Delivery, Fort Collins, Colorado 80523, United States
| | - Delphine K. Farmer
- Department
of Chemistry, Colorado State University, 1872 Campus Delivery, Fort Collins, Colorado 80523, United States
| | - Michael R. McNeil
- Mycobacteria
Research Laboratories, Department of Microbiology, Immunology and
Pathology, Colorado State University, 1682 Campus Delivery, Fort Collins, Colorado 80523, United States
| | - Robert A. Casero
- The
Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, 1650 Orleans Street, Baltimore, Maryland 21287, United
States
| | - John T. Belisle
- Mycobacteria
Research Laboratories, Department of Microbiology, Immunology and
Pathology, Colorado State University, 1682 Campus Delivery, Fort Collins, Colorado 80523, United States
| |
Collapse
|
4
|
Abdelhamid AO, Gomha SM, Shawali AS. Utility of N-aryl 2-aroylhydrazono-propanehydrazonoyl chlorides as precursors for synthesis of new functionalized 1,3,4-thiadiazoles with potential antimicrobial activity. J Adv Res 2014; 6:885-93. [PMID: 26644926 PMCID: PMC4642155 DOI: 10.1016/j.jare.2014.08.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Revised: 08/10/2014] [Accepted: 08/15/2014] [Indexed: 11/26/2022] Open
Abstract
Starting from N-aryl 2-aroylhydrazono-propanehydrazonoyl chlorides, a series of new functionalized 1,3,4-thiadiazoles were prepared. The structures of the compounds prepared were confirmed by both elemental and spectral analyses as well as by alternate synthesis. The mechanisms of the studied reactions are outlined. The antimicrobial activities of the compounds prepared were screened and the results showed that most of such compounds exhibit considerable activities.
Collapse
Affiliation(s)
- Abdou O Abdelhamid
- Department of Chemistry, Faculty of Science, University of Cairo, Giza 12613, Egypt
| | - Sobhi M Gomha
- Department of Chemistry, Faculty of Science, University of Cairo, Giza 12613, Egypt
| | - Ahmad S Shawali
- Department of Chemistry, Faculty of Science, University of Cairo, Giza 12613, Egypt
| |
Collapse
|
5
|
Multistage fragmentation of ion trap mass spectrometry system and pseudo-MS3 of triple quadrupole mass spectrometry characterize certain (E)-3-(dimethylamino)-1-arylprop-2-en-1-ones: a comparative study. ScientificWorldJournal 2014; 2014:702819. [PMID: 24701185 PMCID: PMC3950359 DOI: 10.1155/2014/702819] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Accepted: 12/19/2013] [Indexed: 11/18/2022] Open
Abstract
A new approach was recently introduced to improve the structure elucidation power of tandem mass spectrometry simulating the MS3 of ion trap mass spectrometry system overcoming the different drawbacks of the latter. The fact that collision induced dissociation in the triple quadrupole mass spectrometer system provides richer fragment ions compared to those achieved in the ion trap mass spectrometer system utilizing resonance excitation. Moreover, extracting comprehensive spectra in the ion trap needs multistage fragmentation, whereas similar fragment ions may be acquired from one stage product ion scan using the triple quadrupole mass spectrometer. The new strategy was proven to enhance the qualitative performance of tandem mass spectrometry for structural elucidation of different chemical entities. In the current study we are endeavoring to prove our hypothesis of the efficiency of the new pseudo-MS3 technique via its comparison with the MS3 mode of ion trap mass spectrometry system. Ten pharmacologically and synthetically important (E)-3-(dimethylamino)-1-arylprop-2-en-1-ones (enaminones 4a–j) were chosen as model compounds for this study. This strategy permitted rigorous identification of all fragment ions using triple quadrupole mass spectrometer with sufficient specificity. It can be used to elucidate structures of different unknown components. The data presented in this paper provide clear evidence that our new pseudo-MS3 may simulate the MS3 of ion trap spectrometry system.
Collapse
|
6
|
Lee SH, Choi DW. Comparison between Source-induced Dissociation and Collision-induced Dissociation of Ampicillin, Chloramphenicol, Ciprofloxacin, and Oxytetracycline via Mass Spectrometry. Toxicol Res 2013; 29:107-14. [PMID: 24278636 PMCID: PMC3834448 DOI: 10.5487/tr.2013.29.2.107] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 06/24/2013] [Accepted: 06/25/2013] [Indexed: 11/24/2022] Open
Abstract
Mass spectrometry (MS) is a very powerful instrument that can be used to analyze a wide range of materials such as proteins, peptides, DNA, drugs, and polymers. The process typically involves either chemical or electron (impact) ionization of the analyte. The resulting charged species or fragment is subsequently identified by the detector. Usually, single mass uses source-induced dissociation (SID), whereas mass/mass uses collision-induced dissociation (CID) to analyze the chemical fragmentations Each technique has its own advantages and disadvantages. While CID is most effective for the analysis of pure substances, multiple- step MS is a powerful technique to get structural data. Analysis of veterinary drugs ampicillin, chloramphenicol, ciprofloxacin, and oxytetracycline serves to highlight the slight differences between SID and CID. For example, minor differences were observed between ciprofloxacin and oxytetracycline via SID or CID. However, distinct fragmentation patterns were observed for ampicllin depending on the analysis method. Both SID and CID showed similar fragmentation spectra but different signal intensities for chloramphenicol. There are several factors that can influence the fragmentation spectra, such as the collision energy, major precursor ion, electrospray mode (positive or negative), and sample homogeneity. Therefore, one must select a fragmentation method on an empirical and case-by-case basis.
Collapse
Affiliation(s)
- Seung Ha Lee
- Department of Environmental Health, College of Health Sciences, Korea University, Seoul, Korea
| | | |
Collapse
|