The Experts below are selected from a list of 24294 Experts worldwide ranked by ideXlab platform
Felix Hernandez - One of the best experts on this subject based on the ideXlab platform.
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Methodical Approach for the use of gc tof ms for screening and confirmation of organic pollutants in environmental water
Journal of Mass Spectrometry, 2007Co-Authors: Tania Portoles, Elena Pitarch, F J Lopez, Juan V Sancho, Felix HernandezAbstract:The potential of gas chromatography coupled to time-of-flight mass spectrometry (GC-TOF MS) for the screening of organic pollutants in water was explored. After a conventional SPE step with C18 cartridges, the comparison of spectra with available libraries together with an evaluation of the mass accuracy was the first Approach used for the screening and confirmation of target analytes. However, at low analyte concentrations (i.e. below 0.1 µg/l), this procedure was not feasible and the use of the application manager TargetLynx was evaluated. This application allows the selection of up to five representative ions per analyte, measured with high mass accuracy, and their intensity ratio evaluation. Ion selection, extraction mass window and concentration levels were found to be the critical parameters. The reference compound used as ‘lock mass’ was also found to affect to the quality of information obtained in some particular cases. Full spectral acquisition data generated by the TOF MS analyzer allowed investigation of the presence of several analytes in samples in a post-target style, without the need of reanalyze the water samples. Finally, a Methodical Approach was established for the reliable screening and confirmation of organic pollutants (PAHs, pesticides, octyl/nonyl phenols) in real-world samples, which led to satisfactory results of ∼0.1 µg/l. Copyright © 2007 John Wiley & Sons, Ltd.
Tania Portoles - One of the best experts on this subject based on the ideXlab platform.
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Methodical Approach for the use of gc tof ms for screening and confirmation of organic pollutants in environmental water
Journal of Mass Spectrometry, 2007Co-Authors: Tania Portoles, Elena Pitarch, F J Lopez, Juan V Sancho, Felix HernandezAbstract:The potential of gas chromatography coupled to time-of-flight mass spectrometry (GC-TOF MS) for the screening of organic pollutants in water was explored. After a conventional SPE step with C18 cartridges, the comparison of spectra with available libraries together with an evaluation of the mass accuracy was the first Approach used for the screening and confirmation of target analytes. However, at low analyte concentrations (i.e. below 0.1 µg/l), this procedure was not feasible and the use of the application manager TargetLynx was evaluated. This application allows the selection of up to five representative ions per analyte, measured with high mass accuracy, and their intensity ratio evaluation. Ion selection, extraction mass window and concentration levels were found to be the critical parameters. The reference compound used as ‘lock mass’ was also found to affect to the quality of information obtained in some particular cases. Full spectral acquisition data generated by the TOF MS analyzer allowed investigation of the presence of several analytes in samples in a post-target style, without the need of reanalyze the water samples. Finally, a Methodical Approach was established for the reliable screening and confirmation of organic pollutants (PAHs, pesticides, octyl/nonyl phenols) in real-world samples, which led to satisfactory results of ∼0.1 µg/l. Copyright © 2007 John Wiley & Sons, Ltd.
N. A. Trushkin - One of the best experts on this subject based on the ideXlab platform.
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A new Methodical Approach to determine the quantum yield of the conversion of electronic excitation in the reaction centers of purple bacteria
Biophysics, 2008Co-Authors: A. Yu. Borisov, N. A. TrushkinAbstract:A new Methodical Approach is proposed for precise determination (better than ± 2%) of the quantum yield of charge separation in the reaction centers of purple bacteria; for Rhodospirillum rubrum this value proves to be 93.5%.
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A new Methodical Approach to the determination of the quantum yield of the photoelectric conversion of electronic excitations in reaction centers of purple bacteria
Biofizika, 2008Co-Authors: Borisov Aiu, N. A. TrushkinAbstract:A new Methodical Approach has been developed, which enables one to determine with a high precision (approximately 1.5%) the quantum yield of energy conversion in reaction centers isolated from purple bacterium. This parameter for reaction centers from Rhodospirillum rubrum was estimated to be 93.5 +/- 1,5%. Our Methodical Approach makes it possible to calculate quantum yield values for complete photosystems of purple bacteria.
Juan V Sancho - One of the best experts on this subject based on the ideXlab platform.
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Methodical Approach for the use of gc tof ms for screening and confirmation of organic pollutants in environmental water
Journal of Mass Spectrometry, 2007Co-Authors: Tania Portoles, Elena Pitarch, F J Lopez, Juan V Sancho, Felix HernandezAbstract:The potential of gas chromatography coupled to time-of-flight mass spectrometry (GC-TOF MS) for the screening of organic pollutants in water was explored. After a conventional SPE step with C18 cartridges, the comparison of spectra with available libraries together with an evaluation of the mass accuracy was the first Approach used for the screening and confirmation of target analytes. However, at low analyte concentrations (i.e. below 0.1 µg/l), this procedure was not feasible and the use of the application manager TargetLynx was evaluated. This application allows the selection of up to five representative ions per analyte, measured with high mass accuracy, and their intensity ratio evaluation. Ion selection, extraction mass window and concentration levels were found to be the critical parameters. The reference compound used as ‘lock mass’ was also found to affect to the quality of information obtained in some particular cases. Full spectral acquisition data generated by the TOF MS analyzer allowed investigation of the presence of several analytes in samples in a post-target style, without the need of reanalyze the water samples. Finally, a Methodical Approach was established for the reliable screening and confirmation of organic pollutants (PAHs, pesticides, octyl/nonyl phenols) in real-world samples, which led to satisfactory results of ∼0.1 µg/l. Copyright © 2007 John Wiley & Sons, Ltd.
F J Lopez - One of the best experts on this subject based on the ideXlab platform.
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Methodical Approach for the use of gc tof ms for screening and confirmation of organic pollutants in environmental water
Journal of Mass Spectrometry, 2007Co-Authors: Tania Portoles, Elena Pitarch, F J Lopez, Juan V Sancho, Felix HernandezAbstract:The potential of gas chromatography coupled to time-of-flight mass spectrometry (GC-TOF MS) for the screening of organic pollutants in water was explored. After a conventional SPE step with C18 cartridges, the comparison of spectra with available libraries together with an evaluation of the mass accuracy was the first Approach used for the screening and confirmation of target analytes. However, at low analyte concentrations (i.e. below 0.1 µg/l), this procedure was not feasible and the use of the application manager TargetLynx was evaluated. This application allows the selection of up to five representative ions per analyte, measured with high mass accuracy, and their intensity ratio evaluation. Ion selection, extraction mass window and concentration levels were found to be the critical parameters. The reference compound used as ‘lock mass’ was also found to affect to the quality of information obtained in some particular cases. Full spectral acquisition data generated by the TOF MS analyzer allowed investigation of the presence of several analytes in samples in a post-target style, without the need of reanalyze the water samples. Finally, a Methodical Approach was established for the reliable screening and confirmation of organic pollutants (PAHs, pesticides, octyl/nonyl phenols) in real-world samples, which led to satisfactory results of ∼0.1 µg/l. Copyright © 2007 John Wiley & Sons, Ltd.
