scholarly journals Determination of the sequences of protein-derived peptides and peptide mixtures by mass spectrometry

1971 ◽  
Vol 125 (1) ◽  
pp. 189-201 ◽  
Author(s):  
Howard R. Morris ◽  
Dudley H. Williams ◽  
Richard P. Ambler
Keyword(s):  
Mass Spectrometry ◽  
Prior Knowledge ◽  
Gel Filtration ◽  
Mass Spectrometric ◽  
Peptide Mixture ◽  
Peptide Mixtures ◽  
New Strategy ◽  
First Time ◽  
Resolution Mass

Micro-quantities of protein-derived peptides have been converted into N-acetylated permethyl derivatives, and their sequences determined by low-resolution mass spectrometry without prior knowledge of their amino acid compositions or lengths. A new strategy is suggested for the mass spectrometric sequencing of oligopeptides or proteins, involving gel filtration of protein hydrolysates and subsequent sequence analysis of peptide mixtures. Finally, results are given that demonstrate for the first time the use of mass spectrometry for the analysis of a protein-derived peptide mixture, again without prior knowledge of the protein or components within the mixture.

Mass spectrometric studies of peptides. V. Determination of amino acid sequences in peptide mixtures by mass spectrometry

1973 ◽  
Vol 95 (10) ◽  
pp. 3369-3375 ◽  
Author(s):  
Hans Kaspar. Wipf ◽  
Philip. Irving ◽  
Malcolm. McCamish ◽  
Rengachari. Venkataraghavan ◽  
F. W. McLafferty
Keyword(s):  
Mass Spectrometry ◽  
Amino Acid ◽  
Mass Spectrometric ◽  
Amino Acid Sequences ◽  
Peptide Mixtures

scholarly journals Development of mass spectrometric methods for the determination of emerging pollutants in wastewater

2015 ◽  
Author(s):  
Άννα Μπλέτσου
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Environmental Samples ◽  
Emerging Pollutants ◽  
Mass Spectrometric ◽  
Wide Scope ◽  
Suspect Screening ◽  
Wastewater Samples ◽  
Resolution Mass

The presence of emerging pollutants in environmental samples is unquestionable,since urban, industrial and agricultural activities release in the aquatic environmentgreat amounts of diverse organic micropollutants over the last decade. Environmentalmonitoring is an urgent nowadays, as a part of a holistic environmental riskassessment. The main objective of this thesis was the development of highlysensitive methods for the determination of multi-class emerging pollutants with theuse of different mass spectrometric techniques.First, an introduction on the emerging pollutants is presented, since they encompassa diverse group of compounds, highlighting their wide-scope properties. Specificworkflows and techniques for their determination are then presented, focusing intarget and suspect screening by mass spectrometric techniques and especially in thedevelopment of high-resolution mass analyzers. The experimental section of thethesis consists of three parts: (i) Determination of Linear and Cyclic Siloxanes by gaschromatography hyphenated with mass spectrometry in environmental samples andevaluation of Mass Loadings and Fate in a Wastewater Treatment Plant in Greece(Chapter 3), (ii) Wide-scope quantitative target screening of 2327 emergingcontaminants in wastewater samples with Ultra-Performance Liquid ChromatographyQuadrupole-Time-Of-Flight Mass Spectrometry (UPLC-Q-ToF-HRMS/MS) (Chapter4) and (iii) Suspect screening workflow for the characterization of emerging polarorganic contaminants in wastewater samples with Ultra-Performance LiquidChromatography High-Resolution Mass Spectrometry (UPLC-HRMS/MS) (Chapter5).It is our strong belief that these studies will constitute a step forward in environmental analysis of emerging pollutants

Determination of quaternary ammonium compounds in food products by the method of ultra-performance liquid chromatography/high resolution mass-spectrometry

2020 ◽  
Vol 86 (8) ◽  
pp. 23-31
Author(s):  
V. G. Amelin ◽  
D. S. Bolshakov
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Quaternary Ammonium ◽  
High Resolution Mass Spectrometry ◽  
Food Products ◽  
Quaternary Ammonium Compounds ◽  
High Resolution Mass ◽  
Ammonium Compounds ◽  
Resolution Mass

The goal of the study is developing a methodology for determination of the residual amounts of quaternary ammonium compounds (QAC) in food products by UHPLC/high-resolution mass spectrometry after water-acetonitrile extraction of the determined components from the analyzed samples. The identification and determination of QAC was carried out on an «UltiMate 3000» ultra-high-performance liquid chromatograph (Thermo Scientific, USA) equipped with a «maXis 4G» high-resolution quadrupole-time-of-flight mass spectrometric detector and an ion spray «ionBooster» source (Bruker Daltonics, Germany). Samples of milk, cheese (upper cortical layer), dumplings, pork, chicken skin and ground beef were used as working samples. Optimal conditions are specified for chromatographic separation of the mixture of five QAC, two of them being a mixture of homologues with a linear structure (including isomeric forms). The identification of QAC is carried out by the retention time, exact mass of the ions, and coincidence of the mSigma isotopic distribution. The limits for QAC detection are 0.1 – 0.5 ng/ml, the determination limits are 1 ng/ml for aqueous standard solutions. The determinable content of QAC in food products ranges within 1 – 100 ng/g. The results of analysis revealed the residual amount of QAC present in all samples, which confirms data of numerous sources of information about active use of QAC-based disinfectants in the meat and dairy industry. The correctness of the obtained results is verified by introduction of the additives in food products at a level of 10 ng/g for each QAC. The relative standard deviation of the analysis results does not exceed 0.18. The duration of the analysis is 30 – 40 min.

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