Combination of several mass spectrometry ionization modes: A multiblock analysis for a rapid characterization of the red wine polyphenolic composition

cited By 11International audienceIn the present study, direct flow injection mass spectrometry was investigated for rapid characterization of the polyphenolic composition of red wines. Atmospheric pressure chemical ionization (APCI) and electrospray ionization (ESI) (in both positive and negative ion modes) have been simultaneously used for a more comprehensive analysis of the samples studied. In this way, four mass spectra have been recorded for each wine. Each spectrum was considered as a fingerprint related to the chemical composition. This methodology was applied to a large number of Beaujolais wines from different grades and different vintages.This data set was processed using a chemometrical multiblock analysis, which allowed to synthesize the whole information collected. The results obtained showed that the wine fingerprints address the composition of the main polyphenolic compounds present in the red wines and can discriminate groups of wines showing different polyphenolic compositions. Multiblock analysis appears as a very promising tool to deal with several data tables of multivariate signals in order to define, by combining the whole information, the best operating protocol according to the desired analytical objectives. © 2010 Elsevier B.V

Chocolates classification according to their volatile compounds fingerprints measured by PTR-ToF-MS

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Dynamics of vasoconstructor-vasodilation potential on the background of the development of experimental diabetic retinopathy

Proved development of endothelial dysfunction in rats that was modeled experimental diabetic retinopathy, as evidenced by increased endothelin-1 levels. It was found that at each stage of the study, pathological vasoconstriction increases (p <0.001 compared with the intact group). It was revealed that simulated diabetic retinopathy negatively affects vasodilation potential, as evidenced by the analysis of the content of S-nitrosothiols in the blood of experimental animals (p <0.001 compared with the data of intact animals). In the analysis of vasoconstrictor-vasodilyatatsiynogo potential at each stage of the experiment proved the prevalence of pathological vasoconstriction (p <0.001). The weakening of the vasodilatory potential was step by step more gradual in comparison w ith the dynamics of the increase in the vasodilation potential. In a comparative experiment characteristic pathological stages most pronounced shifts mounted on stage III of diabetic retinopathy study simulated (180-day)

Organoleptic properties of dark chocolates investigated by direct-injection mass spectrometry (PTR-ToF-MS) and GC-MS-Olfactometry

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Does aroma composition allow to discriminate groups of dark chocolates categorized on the basis of their organoleptic properties? Inputs of direct-injection mass spectrometry (PTR-ToF-MS) and GC-Olfactometry

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Direct mass spectrometry approaches to characterize polyphenol composition of complex samples

cited By 39International audienceLower molecular weight polyphenols including proanthocyanidin oligomers can be analyzed after HPLC separation on either reversed-phase or normal phase columns. However, these techniques are time consuming and can have poor resolution as polymer chain length and structural diversity increase. The detection of higher molecular weight compounds, as well as the determination of molecular weight distributions, remain major challenges in polyphenol analysis. Approaches based on direct mass spectrometry (MS) analysis that are proposed to help overcome these problems are reviewed. Thus, direct flow injection electrospray ionization mass spectrometry analysis can be used to establish polyphenol fingerprints of complex extracts such as in wine. This technique enabled discrimination of samples on the basis of their phenolic (i.e. anthocyanin, phenolic acid and flavan-3-ol) compositions, but larger oligomers and polymers were poorly detectable. Detection of higher molecular weight proanthocyanidins was also restricted with matrix-assisted laser desorption ionization (MALDI) MS, suggesting that they are difficult to desorb as gas-phase ions. The mass distribution of polymeric fractions could, however, be determined by analyzing the mass distributions of bovine serum albumin/proanthocyanidin complexes using MALDI-TOF-MS. © 2008 Elsevier Ltd. All rights reserved

Results from a French Inter‐laboratory Campaign on the Biological Methane Potential of Solid Substrates

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Attitudes about pharmacogenomic testing vary by healthcare specialty

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