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Li A, Sun J, Yan H, Li D, Xu W. SAM-SFM: High-Efficiency and High-Resolution Tandem Mass Spectrometry Enabled by Sinusoidal Amplitude Modulation of Multiple Sinusoidal Frequency-Modulated Waveforms. Anal Chem 2024; 96:2183-2190. [PMID: 38247304 DOI: 10.1021/acs.analchem.3c05156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
In miniature ion trap mass spectrometry, achieving a balance between isolation resolution and efficiency is a formidable challenge. The presence of absorption curves causes target ions to inadvertently absorb energy from AC signal components near their resonant frequencies. To mitigate this issue, SAM-SFM waveforms introduce a parameter known as the decreasing factor. Unlike SWIFT waveforms, SAM-SFM's spectral profile intentionally departs from a rectangular window, adopting an arch-shaped excitation window to minimize the impact on target ions and improve ion isolation efficiency. SAM-SFM waveforms have the advantage of low computational complexity, enabling real-time computation using an embedded FPGA technology. Regardless of any parameter changes, the FPGA can consistently guarantee waveform output within 1 μs. This not only enhances throughput but also eliminates the need for a PC in miniature mass spectrometry devices. The performance of SAM-SFM has been validated on an improved "Brick" miniature ion trap mass spectrometer. Comparative experiments with SWIFT waveforms confirm the lossless unit-mass isolation capabilities of SAM-SFM. This waveform has the capability to simultaneously isolate multiple target ions, even allowing for the lossless isolation of ions with lower abundance within isotopic clusters, albeit at the cost of requiring extended isolation durations.
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Affiliation(s)
- Ang Li
- School of Computer Science and Engineering, Northeastern University, Shenyang 110819, China
| | - Jian Sun
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei 430072, China
| | - Haoqiang Yan
- School of Computer Science and Engineering, Northeastern University, Shenyang 110819, China
| | - Dayu Li
- School of Computer Science and Engineering, Northeastern University, Shenyang 110819, China
| | - Wei Xu
- State Key Laboratory of Explosion Science and Technology, School of Life Science, Beijing Institute of Technology, Beijing 100081, China
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Ding X, Yu Q, Lu X, Wang X, Huo X, Qian X. SWIFTSIN: A High-Resolution Ion Isolation Waveform for the Miniaturized Linear Ion Trap Mass Spectrometer by Coarse to Fine Excitation. Anal Chem 2023; 95:2348-2355. [PMID: 36609163 DOI: 10.1021/acs.analchem.2c04225] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
To figure out the reason for the drawback of the stored waveform inverse Fourier transform (SWIFT) waveform and realize the high-resolution ion isolation on the miniaturized linear ion trap mass spectrometer, we studied the efficiency that ions can be excited under different excitation durations and amplitudes at different frequencies and compared the overlap ratios of the effective excitation frequency bandwidths of the adjacent ions. According to this, we proposed a new coarse-to-fine isolation waveform named SWIFTSIN. By superposing one or more sinusoidal waveforms on the SWIFT waveform and modulating the phases of the superposed sinusoidal waveforms, the generated SWIFTSIN waveform can achieve unit mass isolation on the miniaturized linear ion trap mass spectrometer without reducing the intensity of the target ion. The isolation ability of the SWIFTSIN waveform was verified by isolating a single isotope peak in the mixed samples.
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Affiliation(s)
- Xinyue Ding
- Shenzhen International Graduate School, Tsinghua University, Shenzhen518055, China
| | - Quan Yu
- Shenzhen International Graduate School, Tsinghua University, Shenzhen518055, China
| | - Xinqiong Lu
- Shenzhen Chin Instrument Co. Ltd., Shenzhen518055, China
| | - Xiaohao Wang
- Shenzhen International Graduate School, Tsinghua University, Shenzhen518055, China
| | - Xinming Huo
- School of Biomedical Engineering, Shenzhen Campus of Sun Yat-Sen University, Shenzhen518107, China
| | - Xiang Qian
- Shenzhen International Graduate School, Tsinghua University, Shenzhen518055, China
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Välimäki J, Nukareddy P, Uusitalo H, Aapola U. Intraluminal deposits: A rare cause of glaucoma drainage implant total obstruction. Eur J Ophthalmol 2023; 33:307-311. [PMID: 35575733 DOI: 10.1177/11206721221100074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
PURPOSE To report the unforeseen complication of total obstruction of a glaucoma drainage implant (GDI) tube lumen by white deposit material and to present a preliminary report identifying the composition of this material. METHODS Two subjects with a high IOP due to total obstruction of a GDI tube were reviewed. Both patients had a long history with brinzolamide and timolol maleate eye drops. The GDI tube was swept with a 5-0 polypropylene suture stent in order to open the tube. The intraluminal solid sample was successfully collected from the implant tube in one patient. High-performance liquid chromatography-mass spectrometry (HPLC-MS) was used to determine the origin of the intraluminal sample. RESULTS Intraluminal deposits containing components of antiglaucoma drugs e.g., timolol and brinzolamide are a rare cause of total obstruction of GDI tubes. CONCLUSIONS Our study describes a new cause of total obstruction GDI tubes. The long-term use of timolol maleate and brinzolamide and their presence in the intraluminal solid sample collected from the blocked GDI tube suggest that the glaucoma medication may have a role in the pathogenesis. However, the exact mechanism is unknown and requires further studies.
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Affiliation(s)
| | - Praveena Nukareddy
- Department of Ophthalmology, Faculty of Medicine and Health Technology, 7840Tampere University, Tampere, Finland
| | - Hannu Uusitalo
- Department of Ophthalmology, Faculty of Medicine and Health Technology, 7840Tampere University, Tampere, Finland.,Tays Eye Centre, 7840Tampere University Hospital, Tampere, Finland
| | - Ulla Aapola
- Department of Ophthalmology, Faculty of Medicine and Health Technology, 7840Tampere University, Tampere, Finland
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Kushwaha M, Qayum A, Sharma N, Abrol V, Choudhary P, Murtaza M, Singh SK, Vishwakarma RA, Goutam U, Jain SK, Jaglan S. LC-PDA-MS/MS-Based Dereplication Guided Isolation of a New Optical Isomer of 19,20-Epoxycytochalasin-N and Its Cytotoxic Activity. ACS OMEGA 2022; 7:29135-29141. [PMID: 36033687 PMCID: PMC9404496 DOI: 10.1021/acsomega.2c03037] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 07/21/2022] [Indexed: 06/15/2023]
Abstract
The Rosellinia sanctae-cruciana extract was subjected to detailed liquid chromatography tandem mass spectrometry studies. A total of 38 peaks were annotated to m/z 508.26, m/z 510.28, m/z 524.26, m/z 526.28, m/z 540.26, m/z 542.27, and m/z 584.28 [M + H]+. The accurate mass, mutually supported UV/vis spectra, and database search identified these compounds as cytochalasins. Systematic dereplication helped identify a peak at m/z 540.26 [M + H]+ as the new compound. Further, the identified compound was purified by high-performance liquid chromatography and characterized by 2D NMR to be 19,20-epoxycytochalasin N1, a new optical isomer of 19,20-epoxycytochalasin-N. It exhibited substantial cytotoxicity with IC50 values ranging from 1.34 to 19.02 μM. This study shows a fast approach for dereplicating and identifying novel cytochalasin metabolites in crude extracts.
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Affiliation(s)
- Manoj Kushwaha
- Fermentation
& Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu 180001, India
- Department
of Biotechnology, Guru Nanak Dev University, Amritsar 143001, Punjab, India
| | - Arem Qayum
- Cancer
Pharmacology Division, Indian Institute
of Integrative Medicine (CSIR), Canal Road, Jammu 180001, India
- Academy
of Scientific and Innovative Research, Jammu Campus, Jammu 180001, India
| | - Nisha Sharma
- Fermentation
& Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu 180001, India
- Department
of Biotechnology, School of Bioengineering and Biosciences, Lovely Professional University, Phagwara 144411, Punjab, India
| | - Vidushi Abrol
- Fermentation
& Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu 180001, India
| | - Poonam Choudhary
- Fermentation
& Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu 180001, India
| | - Mohd Murtaza
- Fermentation
& Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu 180001, India
- Academy
of Scientific and Innovative Research, Jammu Campus, Jammu 180001, India
| | - Shashank K. Singh
- Cancer
Pharmacology Division, Indian Institute
of Integrative Medicine (CSIR), Canal Road, Jammu 180001, India
- Academy
of Scientific and Innovative Research, Jammu Campus, Jammu 180001, India
| | - Ram A. Vishwakarma
- Medicinal
Chemistry Division, Indian Institute of
Integrative Medicine (CSIR), Canal Road, Jammu 180001, India
| | - Umesh Goutam
- Department
of Biotechnology, School of Bioengineering and Biosciences, Lovely Professional University, Phagwara 144411, Punjab, India
| | - Shreyans K. Jain
- Department
of Biotechnology, School of Bioengineering and Biosciences, Lovely Professional University, Phagwara 144411, Punjab, India
| | - Sundeep Jaglan
- Fermentation
& Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu 180001, India
- Academy
of Scientific and Innovative Research, Jammu Campus, Jammu 180001, India
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Cai T, Guo ZQ, Xu XY, Wu ZJ. Recent (2000-2015) developments in the analysis of minor unknown natural products based on characteristic fragment information using LC-MS. MASS SPECTROMETRY REVIEWS 2018; 37:202-216. [PMID: 27341181 DOI: 10.1002/mas.21514] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Accepted: 06/02/2016] [Indexed: 06/06/2023]
Abstract
Liquid chromatography-Mass Spectrometry (LC-MS) has been widely used in natural product analysis. Global detection and identification of nontargeted components are desirable in natural product research, for example, in quality control of Chinese herbal medicine. Nontargeted components analysis continues to expand to exciting life science application domains such as metabonomics. With this background, the present review summarizes recent developments in the analysis of minor unknown natural products using LC-MS and mainly focuses on the determination of the molecular formulae, selection of precursor ions, and characteristic fragmentation patterns of the known compounds. This review consists of three parts. Firstly, the methods used to determine unique molecular formula of unknown compounds such as accurate mass measurements, MSn spectra, or relative isotopic abundance information, are introduced. Secondly, the methods improving signal-to-noise ratio of MS/MS spectra by manual-MS/MS or workflow targeting-only signals were elucidated; pure precursor ions can be selected by changing the precursor ion isolated window. Lastly, characteristic fragmentation patterns such as Retro-Diels-Alder (RDA), McLafferty rearrangements, "internal residue loss," and so on, occurring in the molecular ions of natural products are summarized. Classical application of characteristic fragmentation patterns in identifying unknown compounds in extracts and relevant fragmentation mechanisms are presented (RDA reactions occurring readily in the molecular ions of flavanones or isoflavanones, McLafferty-type fragmentation reactions of some natural products such as epipolythiodioxopiperazines; fragmentation by "internal residue loss" possibly involving ion-neutral complex intermediates). © 2016 Wiley Periodicals, Inc. Mass Spec Rev 37:202-216, 2018.
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Affiliation(s)
- Tian Cai
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China
- University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Ze-Qin Guo
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
- College of Bioengineering, Chongqing University, Chongqing, 400044, China
| | - Xiao-Ying Xu
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Zhi-Jun Wu
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
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Multiple stage MS in analysis of plasma, serum, urine and in vitro samples relevant to clinical and forensic toxicology. Bioanalysis 2016; 8:457-81. [DOI: 10.4155/bio.16.15] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
This paper reviews MS approaches applied to metabolism studies, structure elucidation and qualitative or quantitative screening of drugs (of abuse) and/or their metabolites. Applications in clinical and forensic toxicology were included using blood plasma or serum, urine, in vitro samples, liquids, solids or plant material. Techniques covered are liquid chromatography coupled to low-resolution and high-resolution multiple stage mass analyzers. Only PubMed listed studies published in English between January 2008 and January 2015 were considered. Approaches are discussed focusing on sample preparation and mass spectral settings. Comments on advantages and limitations of these techniques complete the review.
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