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Development and Validation of a Novel LC-MS/MS-Based Proteomics Method for Quantitation of Retinol Binding Protein 4 (RBP4) and Transthyretin (TTR). [PDF]
J Proteome ResYadav AS +6 more
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Novel LC-MS/MS method for measuring methotrexate in high-dose therapy: a comparative study with commercial EMIT and EIA immunoassays. [PDF]
Pharmacol RepCzajkowska A +6 more
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Development of a Stable Isotope Dilution Assay for Tenuazonic Acid
Journal of Agricultural and Food Chemistry, 2011A stable isotope dilution assay (SIDA) for the Alternaria mycotoxin tenuazonic acid was developed. Therefore, [(13)C(6),(15)N]-tenuazonic acid was synthesized from [(13)C(6),(15)N]-isoleucine by Dieckmann intramolecular cyclization after acetoacetylation with diketene.
Stefan Asam, Michael Rychlik
exaly +4 more sources
International Journal for Vitamin and Nutrition Research, 2005
Different foods and feedstuffs were analyzed for pantothenic acid (PA) by the recently developed stable isotope dilution assay (SIDA) and by the standard method, a microbiological assay (MA). The SIDA involved the use of [13C3, 15N]-pantothenic acid as the internal standard and detection by liquid chromatography-tandem mass spectrometry.
Michael Rychlik
exaly +4 more sources
Different foods and feedstuffs were analyzed for pantothenic acid (PA) by the recently developed stable isotope dilution assay (SIDA) and by the standard method, a microbiological assay (MA). The SIDA involved the use of [13C3, 15N]-pantothenic acid as the internal standard and detection by liquid chromatography-tandem mass spectrometry.
Michael Rychlik
exaly +4 more sources
International Journal for Vitamin and Nutrition Research, 2013
Dual-label stable isotope dilution assays for the simultaneous quantification of isotopologic folates in clinical samples offer the perspective for differentiating between unlabeled folates from endogenous body pools and administered [13C5]-labeled folates from a test dose when performing bioavailability trials.
Michael Rychlik, Cornelia Witthöft
exaly +5 more sources
Dual-label stable isotope dilution assays for the simultaneous quantification of isotopologic folates in clinical samples offer the perspective for differentiating between unlabeled folates from endogenous body pools and administered [13C5]-labeled folates from a test dose when performing bioavailability trials.
Michael Rychlik, Cornelia Witthöft
exaly +5 more sources
Biochimica Et Biophysica Acta - General Subjects, 2003
A stable isotope dilution method was developed to analyse 2-heptyl-3,4-dihydroxyquinoline, also called the Pseudomonas quinolone signal (PQS), directly in Pseudomonas aeruginosa cultures by liquid chromatography coupled to mass spectrometry (LC/MS).
Eric Deziel, Laurence Rahme
exaly +4 more sources
A stable isotope dilution method was developed to analyse 2-heptyl-3,4-dihydroxyquinoline, also called the Pseudomonas quinolone signal (PQS), directly in Pseudomonas aeruginosa cultures by liquid chromatography coupled to mass spectrometry (LC/MS).
Eric Deziel, Laurence Rahme
exaly +4 more sources
Mycotoxin Research, 2011
The Alternaria mycotoxin tenuazonic acid (TA) was quantified in fruit juices (n = 50), cereals (n = 12) and spices (n = 38) using a recently developed stable isotope dilution assay (SIDA). [(13) C6,(15) N]-TA was used as the internal standard. Method validation revealed low limits of detection (LODs) of 0.15 μg/kg (fruit juices), 1.0 μg/kg (cereals ...
Stefan Asam +2 more
exaly +3 more sources
The Alternaria mycotoxin tenuazonic acid (TA) was quantified in fruit juices (n = 50), cereals (n = 12) and spices (n = 38) using a recently developed stable isotope dilution assay (SIDA). [(13) C6,(15) N]-TA was used as the internal standard. Method validation revealed low limits of detection (LODs) of 0.15 μg/kg (fruit juices), 1.0 μg/kg (cereals ...
Stefan Asam +2 more
exaly +3 more sources
Stable isotope dilution assays in mycotoxin analysis
Analytical and Bioanalytical Chemistry, 2007The principle and applications of stable isotope dilution assays (SIDAs) in mycotoxin analysis are critically reviewed. The general section includes historical aspects of SIDAs, the prerequisites and limitations of the use of stable isotopically labelled internal standards, and possible calibration procedures.
Michael, Rychlik, Stefan, Asam
openaire +2 more sources
Quantification of the Mycotoxin Patulin by a Stable Isotope Dilution Assay
Journal of Agricultural and Food Chemistry, 1999Two stable isotope dilution assays for the quantification of patulin [4-hydroxy-4H-furo[3,2-c]pyran-2(6H)-one] in foods were developed using (13)C-labeled patulin as the internal standard. One method was performed by means of LC/MS in negative electrospray ionization mode without derivatization; the other used HRGC/HRMS after trimethylsilylation of the
M, Rychlik, P, Schieberle
openaire +2 more sources