نتایج جستجو برای: hplc apci

تعداد نتایج: 33470  

Journal: :Chemical senses 2004
Swen Rabe Robert S T Linforth Ulrich Krings Andrew J Taylor Ralf G Berger

In-mouth volatile release from flavoured water was followed using atmospheric pressure chemical ionization-mass spectrometry (APCI-MS) or using a hand-held, computer-controlled device based on sequential trapping of flavours on Tenax traps. The present results verify recent in vitro data obtained with a sophisticated, fully computerized mouth model apparatus and confirm its validity for the sim...

Journal: :Chemical senses 2011
Masayuki Yabuki David J Scott Loïc Briand Andrew J Taylor

Uptake, retention and release of 5 selected odorants (benzaldehyde, 2-methylpyrazine, 2-isobutyl-3-methoxypyrazine, 2-isobutylthiazole, and 2,4,5-trimethylthiazole) by recombinant rat odor-binding protein 3 (rat-OBP3) were measured in a model system under nonequilibrium conditions. Gaseous odorants were introduced into a 100 mm section of a polar deactivated capillary in which aqueous rat-OBP3 ...

Journal: :Journal of the American Society for Mass Spectrometry 2021

Gas phase reactions between hydrated protons H+(H2O)n and a substance M, as seen in atmospheric pressure chemical ionization (APCI) with mass spectrometry (MS) ion mobility (IMS), were modeled computationally using initial amounts of [M] [H+(H2O)n], rate constants k1 to form protonated monomer (MH+(H2O)x) k2 proton bound dimer (M2H+(H2O)z), diffusion constants. At 1 × 1010 cm–3 (0.4 ppb) for [H...

Journal: :Journal of Food Composition and Analysis 2023

Although gas chromatography–triple quadrupole mass spectrometry (GC-MS/MS) has been applied to the determination of polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) in various food samples, there is insufficient evidence evaluate its equivalence with chromatography–high resolution (HRMS). In present study, two GC-MS/MS instruments different ion sources (advanced electron ionization [EI] a...

Journal: :Journal of Chemical Education 2022

This paper describes the application of an accessible, benchtop mass spectrometer using Atmospheric Solids Analysis Probe (ASAP) for easy sample introduction, coupled with Pressure Chemical Ionization (APCI) as a soft ionization technique, to inquiry-based identification metal composition alloys, including coins. Students experience preparation acetylacetonates via traditional salt metathesis a...

Journal: :Journal of chromatography. A 2011
Miroslav Lísa Eva Cífková Michal Holčapek

Lipids are important components in all biological tissues having many essential roles associated with the proper function of the organism. Their analysis in the biological tissues and body fluids is a challenging task due to the extreme sample complexity of polar lipids and to their amphiphilic character. In this work, we describe a new method for the characterization of the lipid composition i...

Journal: :Journal of agricultural and food chemistry 2007
Angelina Pena Celeste M Lino Rosa Alonso Damia Barceló

A sensitive and specific method is described for the simultaneous determination of oxytetracycline, tetracycline (TC), and chlortetracycline residues in edible swine tissues, by combining liquid chromatography with spectrofluorometric and mass spectrometry detection. The procedure involved a preliminary extraction with EDTA-McIlvaine buffer acidified at pH 4.0, followed by solid-phase extractio...

Journal: :Rapid communications in mass spectrometry : RCM 2005
Keiji G Asano Michael J Ford Bruce A Tomkins Gary J Van Berkel

A self-aspirating heated nebulizer probe is described and demonstrated for use in the direct analysis of analytes on surfaces and in liquid samples by atmospheric pressure chemical ionization (APCI) mass spectrometry. Functionality and performance of the probe as a self-aspirating APCI source is demonstrated using reserpine and progesterone as test compounds. The utility of the probe to sample ...

2013
Ravi K Khajuria Neha Sharma Jawahar L Koul Mahendra K Verma

Studies on piperine ((M 1 )) and its synthetic analogues (M 2-18 ) by positive electrospray ionisation mass spectrometry were carried out in the flow injection mode of analysis in methanol. The MS experiments on these compounds at concentration 5 ng/μL or above yielded dimeric ionic species [2 M + Na](+) which revealed that piperine and its analogues exhibit clustering of ions when the solution...

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