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Qiu X, Chen F, Liu T, Feng F, Zhang Y, Feng X, Zhang F. Developing CHCA/PPD as a novel matrix for enhanced matrix-assisted laser desorption/ionization-mass spectrometry imaging for analysis of antibiotics in grass carp tissues. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2023; 37:e9428. [PMID: 36346288 DOI: 10.1002/rcm.9428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2022] [Revised: 10/18/2022] [Accepted: 11/05/2022] [Indexed: 06/16/2023]
Abstract
UNLABELLED Antibiotics have important medical value, but they need to be monitored when used as veterinary drugs. We report α-cyano-4-hydroxycinnamic acid/p-phenylenediamine (CHCA/PPD) hybrid as a novel matrix for enhanced matrix-assisted laser desorption/ionization-mass spectrometry imaging (MALDI-MSI) in situ the spatial distribution of antibiotic drugs in grass carp tissues. METHOD We have used MALDI-TOF-MSI in positive ion mode for the analysis of quinolones and sulfonamides in grass carps. A novel CHCA/PPD matrix was prepared and applied using a simple method to improve the analysis. RESULTS Compared with the traditional matrix, CHCA/PPD significantly improved the detection intensity of quinolones and sulfonamides with better sensitivity (17.20%-94.30%) and reproducibility. For demonstration, this novel matrix was successfully applied to visualize enrofloxacin (ENR) in grass carp tissues, with the entire abundance differences clearly observed based on MALDI-MSI. The concentration levels in different tissues were determined, with a calibration curve of 10-2000 μg/ml (R2 > 0.993). CONCLUSION This study was the first to introduce CHCA/PPD as a novel matrix, and the classical acid-base mixing was used to improve the ionization effect of the traditional matrix CHCA in MALDI. Based on CHCA/PPD, MALDI-MSI detected ENR in different grass carp tissues for the first time and realized the spatial distribution and concentration detection.
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Affiliation(s)
- Xin Qiu
- Institute of Food Safety, Chinese Academy of Inspection and Quarantine, Beijing, Daxing District, China
- Key Laboratory of Food Quality and Safety for State Market Regulation, Beijing, Daxing District, China
- Department of Pharmacy, West China Second University Hospital, Sichuan University, Chengdu, China
| | - Fengming Chen
- Institute of Food Safety, Chinese Academy of Inspection and Quarantine, Beijing, Daxing District, China
- Key Laboratory of Food Quality and Safety for State Market Regulation, Beijing, Daxing District, China
| | - Tong Liu
- Institute of Food Safety, Chinese Academy of Inspection and Quarantine, Beijing, Daxing District, China
- Key Laboratory of Food Quality and Safety for State Market Regulation, Beijing, Daxing District, China
| | - Feng Feng
- Institute of Food Safety, Chinese Academy of Inspection and Quarantine, Beijing, Daxing District, China
- Key Laboratory of Food Quality and Safety for State Market Regulation, Beijing, Daxing District, China
| | - Yuan Zhang
- Department of Pharmacy, China Medical University, Shenyang, Shenbei New District, China
| | - Xuesong Feng
- Department of Pharmacy, China Medical University, Shenyang, Shenbei New District, China
| | - Feng Zhang
- Institute of Food Safety, Chinese Academy of Inspection and Quarantine, Beijing, Daxing District, China
- Key Laboratory of Food Quality and Safety for State Market Regulation, Beijing, Daxing District, China
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Viral Biomarker Detection and Validation Using MALDI Mass Spectrometry Imaging (MSI). Proteomes 2022; 10:proteomes10030033. [PMID: 36136311 PMCID: PMC9506211 DOI: 10.3390/proteomes10030033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 08/18/2022] [Accepted: 09/05/2022] [Indexed: 11/21/2022] Open
Abstract
(1) Background: MALDI imaging is a technique that still largely depends on time of flight (TOF)-based instrument such as the Bruker UltrafleXtreme. While capable of performing targeted MS/MS, these instruments are unable to perform fragmentation while imaging a tissue section necessitating the reliance of MS1 values for peptide level identifications. With this premise in mind, we have developed a hybrid bioinformatic/image-based method for the identification and validation of viral biomarkers. (2) Methods: Formalin-Fixed Paraffin-Embedded (FFPE) mouse samples were sectioned, mounted and prepared for mass spectrometry imaging using our well-established methods. Peptide identification was achieved by first extracting confident images corresponding to theoretical viral peptides. Next, those masses were used to perform a Peptide Mmass Fingerprint (PMF) searched against known viral FASTA sequences against a background mouse FASTA database. Finally, a correlational analysis was performed with imaging data to confirm pixel-by-pixel colocalization and intensity of viral peptides. (3) Results: 14 viral peptides were successfully identified with significant PMF Scores and a correlational result of >0.79 confirming the presence of the virus and distinguishing it from the background mouse proteins. (4) Conclusions: this novel approach leverages the power of mass spectrometry imaging and provides confident identifications for viral proteins without requiring MS/MS using simple MALDI Time Of Flight/Time Of Flight (TOF/TOF) instrumentation.
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