Analysis of the volatile constituents of cooked petai beans (Parkia speciosa) using high-resolution GC/ToF-MS

2008 ◽  
Vol 23 (6) ◽  
pp. 434-440 ◽  
Author(s):  
Eric Frérot ◽  
Alain Velluz ◽  
Alain Bagnoud ◽  
Estelle Delort
Keyword(s):  
High Resolution ◽  
Volatile Constituents ◽  
Tof Ms

scholarly journals Characterization of biomass burning smoke from cooking fires, peat, crop residue and other fuels with high resolution proton-transfer-reaction time-of-flight mass spectrometry

2014 ◽  
Vol 14 (15) ◽  
pp. 22163-22216 ◽  
Author(s):  
C. E. Stockwell ◽  
P. R. Veres ◽  
J. Williams ◽  
R. J. Yokelson
Keyword(s):  
Reaction Time ◽  
High Resolution ◽  
Proton Transfer ◽  
Organic Compounds ◽  
Biomass Burning ◽  
Crop Residue ◽  
Transfer Reaction ◽  
Time Of Flight ◽  
Proton Transfer Reaction ◽  
Tof Ms

Abstract. We deployed a high-resolution proton-transfer-reaction time-of-flight mass spectrometer (PTR-TOF-MS) to measure biomass burning emissions from peat, crop-residue, cooking fires, and many other fire types during the fourth Fire Lab at Missoula Experiment (FLAME-4) laboratory campaign. A combination of gas standards calibrations and composition sensitive, mass dependent calibration curves were applied to quantify gas-phase non-methane organic compounds (NMOCs) observed in the complex mixture of fire emissions. We used several approaches to assign best identities to most major "exact masses" including many high molecular mass species. Using these methods approximately 80–96% of the total NMOC mass detected by PTR-TOF-MS and FTIR was positively or tentatively identified for major fuel types. We report data for many rarely measured or previously unmeasured emissions in several compound classes including aromatic hydrocarbons, phenolic compounds, and furans; many of which are suspected secondary organic aerosol precursors. A large set of new emission factors (EFs) for a range of globally significant biomass fuels is presented. Measurements show that oxygenated NMOCs accounted for the largest fraction of emissions of all compound classes. In a brief study of various traditional and advanced cooking methods, the EFs for these emissions groups were greatest for open 3-stone cooking in comparison to their more advanced counterparts. Several little-studied nitrogen-containing organic compounds were detected from many fuel types that together accounted for 0.1–8.7% of the fuel nitrogen and some may play a role in new particle formation.

Scope and limitations of principal component analysis of high resolution LC-TOF-MS data: the analysis of the chlorogenic acid fraction in green coffee beans as a case study

2011 ◽  
Vol 3 (1) ◽  
pp. 144-155 ◽  
Author(s):  
Nikolai Kuhnert ◽  
Rakesh Jaiswal ◽  
Pinkie Eravuchira ◽  
Rasha M. El-Abassy ◽  
Bernd von der Kammer ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
High Resolution ◽  
Chlorogenic Acid ◽  
Principal Component ◽  
Green Coffee ◽  
Acid Fraction ◽  
Green Coffee Beans ◽  
Coffee Beans ◽  
Tof Ms

Sequential Observation of Alkali‐halide Gas Phase Clusters in High Resolution TOF‐MS and Prediction of Their Structures

2013 ◽  
Vol 26 (6) ◽  
pp. 729-738 ◽  
Author(s):  
Hui Wen ◽  
Yi‐rong Liu ◽  
Kang‐ming Xu ◽  
Teng Huang ◽  
Chang‐jin Hu ◽  
...  
Keyword(s):  
High Resolution ◽  
Gas Phase ◽  
Alkali Halide ◽  
Gas Phase Clusters ◽  
Tof Ms

A new method for high-resolution and high-precision analysis of flunitrazepam and 7-aminoflunitrazepam in human body fluids using a Monolithic SPE SpinTip and UPLC–Q-ToF–MS

2019 ◽  
Vol 37 (2) ◽  
pp. 387-397
Author(s):  
Masaya Fujishiro ◽  
Ai Noguchi ◽  
Xiao-Pen Lee ◽  
Chika Hasegawa ◽  
Takeshi Kumazawa ◽  
...  
Keyword(s):  
High Resolution ◽  
High Precision ◽  
Human Body ◽  
Body Fluids ◽  
New Method ◽  
Precision Analysis ◽  
Tof Ms

scholarly journals Characterization of biomass burning emissions from cooking fires, peat, crop residue, and other fuels with high-resolution proton-transfer-reaction time-of-flight mass spectrometry

2015 ◽  
Vol 15 (2) ◽  
pp. 845-865 ◽  
Author(s):  
C. E. Stockwell ◽  
P. R. Veres ◽  
J. Williams ◽  
R. J. Yokelson
Keyword(s):  
Reaction Time ◽  
High Resolution ◽  
Proton Transfer ◽  
Organic Compounds ◽  
Biomass Burning ◽  
Crop Residue ◽  
Transfer Reaction ◽  
Time Of Flight ◽  
Proton Transfer Reaction ◽  
Tof Ms

Abstract. We deployed a high-resolution proton-transfer-reaction time-of-flight mass spectrometer (PTR-TOF-MS) to measure biomass-burning emissions from peat, crop residue, cooking fires, and many other fire types during the fourth Fire Lab at Missoula Experiment (FLAME-4) laboratory campaign. A combination of gas standard calibrations and composition sensitive, mass-dependent calibration curves was applied to quantify gas-phase non-methane organic compounds (NMOCs) observed in the complex mixture of fire emissions. We used several approaches to assign the best identities to most major "exact masses", including many high molecular mass species. Using these methods, approximately 80–96% of the total NMOC mass detected by the PTR-TOF-MS and Fourier transform infrared (FTIR) spectroscopy was positively or tentatively identified for major fuel types. We report data for many rarely measured or previously unmeasured emissions in several compound classes including aromatic hydrocarbons, phenolic compounds, and furans; many of these are suspected secondary organic aerosol precursors. A large set of new emission factors (EFs) for a range of globally significant biomass fuels is presented. Measurements show that oxygenated NMOCs accounted for the largest fraction of emissions of all compound classes. In a brief study of various traditional and advanced cooking methods, the EFs for these emissions groups were greatest for open three-stone cooking in comparison to their more advanced counterparts. Several little-studied nitrogen-containing organic compounds were detected from many fuel types, that together accounted for 0.1–8.7% of the fuel nitrogen, and some may play a role in new particle formation.

scholarly journals Rapid identification of bacterial isolates from wheat roots by high resolution whole cell MALDI-TOF MS analysis

2013 ◽  
Vol 165 (3-4) ◽  
pp. 167-174 ◽  
Author(s):  
Maria Isabel Stets ◽  
Artur Soares Pinto ◽  
Luciano Fernandes Huergo ◽  
Emanuel Maltempi de Souza ◽  
Vandeir Francisco Guimarães ◽  
...  
Keyword(s):  
High Resolution ◽  
Rapid Identification ◽  
Bacterial Isolates ◽  
Wheat Roots ◽  
Whole Cell ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Ms Analysis ◽  
Tof Ms

Decoration of trastuzumab with short oligonucleotides: synthesis and detailed characterization

2017 ◽  
Vol 15 (42) ◽  
pp. 8923-8928 ◽  
Author(s):  
A. M. Carvalho ◽  
A. Manicardi ◽  
C. Véliz Montes ◽  
S. B. Gunnoo ◽  
R. J. Schneider ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
High Resolution ◽  
Metastatic Breast ◽  
Detailed Characterization ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Oligonucleotides Synthesis ◽  
Tof Ms

Trastuzumab, an antibody prescribed for the treatment of metastatic breast cancer, was covalently conjugated to oligonucleotides and characterized by high resolution MALDI-ToF MS.

A Correction Method for Time to Digital Converter

2012 ◽  
Vol 220-223 ◽  
pp. 2138-2143
Author(s):  
Jie Tao Diao ◽  
Qing Jiang Li ◽  
Peng Wang ◽  
Yi Nan Wang
Keyword(s):  
High Resolution ◽  
Data Processing ◽  
Time Resolution ◽  
Correction Method ◽  
Time Measurement ◽  
Digital Converter ◽  
Resolution Time ◽  
Time To Digital Converter ◽  
Starting Time ◽  
Tof Ms

The hardware structure and the data-processing flow of FPGA based Time to Digital Converter (TDC) are introduced firstly in the essay. Then, according to the issue of inaccuracy in arriving time of external triggers, a correction method is proposed to enhance the accuracy of starting time. In the end, by contrast experiment, it is shown that this correction method could improve the accuracy of starting time effectively. In addition, the minimum time resolution is 400ps, which makes the TDC be adequate for applications in the fields which require high-resolution time measurement, for example, in the application of time-of-flight mass spectrometer (TOF-MS).

Quantitative Multiclass Pesticide Residue Analysis in Apple, Pear, and Grape by Modified QuEChERS and Liquid Chromatography Coupled to High-Resolution Mass Spectrometry

2016 ◽  
Vol 99 (6) ◽  
pp. 1426-1435 ◽  
Author(s):  
Juliana S Munaretto ◽  
Mariela de S Viera ◽  
Manoel L Martins ◽  
Martha B Adaime ◽  
Renato Zanella
Keyword(s):  
High Resolution ◽  
Pesticide Residue ◽  
High Resolution Mass Spectrometry ◽  
Residue Analysis ◽  
Mass Accuracy ◽  
Reliable Technique ◽  
Average Mass ◽  
Modified Quechers ◽  
Tof Ms

Abstract Most of the analytical methods currently applied in food control laboratories are focused on the determination of target compounds using LC coupled to tandem MS, which is an effective technique, but low-resolution MS is limited. Thus, a method for determination of pesticide multiresidues in fruits (pear, apple, and grape) using a modified quick, easy, cheap, effective, rugged, and safe method and LC coupled to quadrupole time-of-flight (Q-TOF) MS was developed and validated. The proposed method showed good linearity (r2 > 0.99) from 1 to 100 μg/L. Recoveries for blank samples spiked at 0.01, 0.04, and 0.10 mg/kg were between 66 and 122%, with RSDs <28%. Respective LOQs for apple, pear, and grape matrixes were 0.01 mg/kg for 112, 120, and 118 compounds, and 0.04 mg/kg for 22, 12, and 17 compounds, and average mass accuracy error was 3.2 ppm. LC with Q-TOF MS detection using protonated molecular ion and/or adducts and mass accuracy provided reliability for the method. The proposed method is effective for pesticide residue determination in apple, pear, and grape samples, proving that high-resolution MS using full scan mode can be a powerful and reliable technique for quantification purposes, being adequate for application in the surveillance of maximum residue limits set by different legislations.

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