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Proteomics in quality control: Whey protein-based supplements.
UNLABELLED The growing consumption of nutritional supplements might represent a problem, given the concern about the quality of these supplements. One of the most used supplements is whey proteinExpand
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Detection of new urinary exemestane metabolites by gas chromatography coupled to mass spectrometry
Exemestane is an aromatase enzyme complex inhibitor. Its metabolism in humans is not fully described and there is only one known metabolite: 17β-hydroxyexemestane. In this work, excretion studiesExpand
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Detection of designer steroid methylstenbolone in “nutritional supplement” using gas chromatography and tandem mass spectrometry: Elucidation of its urinary metabolites
The use of "nutritional supplements" containing unapproved substances has become a regular practice in amateur and professional athletes. This represents a dangerous habit for their health once noExpand
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Detection of new exemestane metabolites by liquid chromatography interfaced to electrospray-tandem mass spectrometry
Exemestane is an irreversible aromatase inhibitor used for anticancer therapy. Unfortunately, this drug is also misused in sports to avoid some adverse effects caused by steroids administration. ForExpand
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Development of a new sodium diclofenac certified reference material using the mass balance approach and ¹H qNMR to determine the certified property value.
Certified reference materials (CRMs) are essential tools to guarantee the metrological traceability of measurement results to the International System of Units (SI), which means the accuracy andExpand
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Nuclear magnetic resonance using electronic referencing: method validation and evaluation of the measurement uncertainties for the quantification of benzoic acid in orange juice
Quantitative nuclear magnetic resonance measurements have become more popular over the last decade. The introduction of new methods and experimental parameters has been of fundamental importance inExpand
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Analysis of exemestane and 17β-hydroxyexemestane in human urine by gas chromatography/mass spectrometry: development and validation of a method using MO-TMS derivatives.
Trimethylsilylation of anabolic agents and their metabolites is frequently achieved by using the derivatization mixture N-methyl-N-(trimethylsilyl)trifluoroacetamide (MSTFA)/NH(4)I/2-mercaptoethanol.Expand
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Salbutamol extraction from urine and its stability in different solutions: identification of methylation products and validation of a quantitative analytical method.
Salbutamol is commonly used in asthma treatment, being considered a short-effect bronchodilator. This drug poses special interest in certain fields of chemical analysis, such as food, clinical andExpand
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Quantitative nuclear magnetic resonance for purity assessment of polycyclic aromatic hydrocarbons
The application of 1H quantitative nuclear magnetic resonance (1H qNMR) for purity determination of organic compounds is well documented in the literature. The aim of this work is to determine if theExpand
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Development and validation of a suite of standards for the purity assignment of organic compounds by quantitative NMR spectroscopy
The evaluation of seven internal standard reference materials (ISRMs) to act as a 'universal' SI-traceable calibrator suite for organic compound purity determination by quantitative nuclear magneticExpand
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