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https://www.readbyqxmd.com/read/29352581/facile-gas-chromatography-tandem-mass-spectrometry-stable-isotope-dilution-method-for-the-quantification-of-sesquiterpenes-in-grape
#1
Nina Duhamel, Davide Slaghenaufi, Lisa I Pilkington, Mandy Herbst-Johnstone, Roberto Larcher, David Barker, Bruno Fedrizzi
Sesquiterpenes are a widespread class of compounds of increasing interest found in grapes and wines, amongst many other natural sources. Due to a lack of standards and the complexity of the mass spectra fragmentation, accurate quantification of these low concentration compounds had not previously been accomplished. The current paper presents a new method for the concurrent quantification of several sesquiterpenes. The multivariate method optimisation is presented. Synthesised isotopic standards were utilised in conjunction with solid phase microextraction (SPME) and gas chromatography-tandem mass spectrometry (GC-MS/MS) to perform a standard isotope dilution assay (SIDA)...
January 5, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29351285/wine-yeast-phenomics-a-standardized-fermentation-method-for-assessing-quantitative-traits-of-saccharomyces-cerevisiae-strains-in-enological-conditions
#2
Emilien Peltier, Margaux Bernard, Marine Trujillo, Duyên Prodhomme, Jean-Christophe Barbe, Yves Gibon, Philippe Marullo
This work describes the set up of a small scale fermentation methodology for measuring quantitative traits of hundreds of samples in an enological context. By using standardized screw cap vessels, the alcoholic fermentation kinetics of Saccharomyces cerevisiae strains were measured by following their weight loss over the time. This dispositive was coupled with robotized enzymatic assays for measuring metabolites of enological interest in natural grape juices. Despite the small volume used, kinetic parameters and fermentation end products measured are similar with those observed in larger scale vats...
2018: PloS One
https://www.readbyqxmd.com/read/29347867/the-mediterranean-diet-its-definition-and-evaluation-of-a-priori-dietary-indexes-in-primary-cardiovascular-prevention
#3
Annunziata D'Alessandro, Giovanni De Pergola
We have analysed the definition of Mediterranean Diet in 28 studies included in six meta-analyses evaluating the relation between the Mediterranean Diet and primary prevention of cardiovascular disease. Some typical food of this dietary pattern like whole cereals, olive oil and red wine were taken into account only in a few a priori indexes, and the dietary pattern defined as Mediterranean showed many differences among the studies and compared to traditional Mediterranean Diet of the early 1960s. Altogether, the analysed studies show a protective effect of the Mediterranean Diet against cardiovascular disease but present different effects against specific conditions as cerebrovascular disease and coronary heart disease...
January 18, 2018: International Journal of Food Sciences and Nutrition
https://www.readbyqxmd.com/read/29342836/cool-climate-red-wines-chemical-composition-and-comparison-of-two-protocols-for-%C3%A2-h-nmr-analysis
#4
Violetta Aru, Klavs Martin Sørensen, Bekzod Khakimov, Torben Bo Toldam-Andersen, Søren Balling Engelsen
This study investigates the metabolome of 26 experimental cool-climate wines made from 22 grape varieties using two different protocols for wine analysis by proton nuclear magnetic resonance (¹H-NMR) spectroscopy. The wine samples were analyzed as-is (wet) and as dried samples. The NMR datasets were preprocessed by alignment and mean centering. No normalization or scaling was performed. The "wet" method preserved the inherent properties of the samples and provided a fast and effective overview of the molecular composition of the wines...
January 13, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29341474/effect-of-staining-beverages-on-color-and-translucency-of-cad-cam-composites
#5
S H Q Quek, A U J Yap, V Rosa, K B C Tan, K H Teoh
This study investigated the color (ΔE) and translucency changes (ΔTP) of CAD/CAM composites after exposure to staining solutions using both spectrophotometer and shade-matching device. Direct (Filtek Z350XT [ZT]), indirect (Shofu Ceramage [CE]) and CAD/CAM (Shofu HC Block [HC], Lava Ultimate [LU], Vita Enamic [EN]) composite specimens measuring 12 × 14 × 1.5 mm were fabricated, divided into five groups (n = 8), and immersed in cola, tea, coffee, red wine, distilled water (control) at 37°C for 7 days...
January 17, 2018: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29339827/the-impact-of-so2-on-wine-flavanols-and-indoles-in-relation-to-wine-style-and-age
#6
Panagiotis Arapitsas, Graziano Guella, Fulvio Mattivi
Wine has one of the broadest chemical profiles, and the common oenological practice of adding the antioxidant and antimicrobial sulfur dioxide has a major impact on its metabolomic fingerprint. In this study, we investigated novel discovered oenological reactions primarily occurring between wine metabolites and sulfur dioxide. The sulfonated derivatives of epicatechin, procyanidin B2, indole acetic acid, indole lactic acid and tryptophol were synthesized and for the first time quantified in wine. Analysis of 32 metabolites in 195 commercial wines (1986-2016 vintages) suggested that sulfonation of tryptophan metabolites characterised white wines, in contrast to red wines, where sulfonation of flavanols was preferred...
January 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29338878/mostly-old-wine-in-new-bottles-reply-to-commentaries
#7
Michael G Wade
No abstract text is available yet for this article.
January 12, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29337868/bacteriophage-gc1-a-novel-tectivirus-infecting-gluconobacter-cerinus-an-acetic-acid-bacterium-associated-with-wine-making
#8
Cécile Philippe, Mart Krupovic, Fety Jaomanjaka, Olivier Claisse, Melina Petrel, Claire le Marrec
The Gluconobacter phage GC1 is a novel member of the Tectiviridae family isolated from a juice sample collected during dry white wine making. The bacteriophage infects Gluconobacter cerinus, an acetic acid bacterium which represents a spoilage microorganism during wine making, mainly because it is able to produce ethyl alcohol and transform it into acetic acid. Transmission electron microscopy revealed tail-less icosahedral particles with a diameter of ~78 nm. The linear double-stranded DNA genome of GC1 (16,523 base pairs) contains terminal inverted repeats and carries 36 open reading frames, only a handful of which could be functionally annotated...
January 16, 2018: Viruses
https://www.readbyqxmd.com/read/29337800/old-wine-in-new-bottles-continuous-versus-intermittent-renal-replacement-therapy-in-the-icu
#9
Anne-Cornélie de Pont, Meint Volbeda
No abstract text is available yet for this article.
February 2018: Critical Care Medicine
https://www.readbyqxmd.com/read/29337293/a-teem-sup-tm-sup-a-new-molecular-fingerprinting-technique-simultaneous-absorbance-transmission-and-fluorescence-excitation-emission-matrix-method
#10
Alessia Quatela, Adam Gilmore, Karen E Steege Gall, Marinella Sandros, Karoly Csatorday, Alex Siemiarczuk, Boqian Ben Yang, Loïc Camenen
We investigate the new simultaneous Absorbance-Transmission and fluorescence Excitation-Emission Matrix method for rapid and effective characterization of the varying components from a mixture. The Absorbance-Transmission and fluorescence Excitation-Emission Matrix method uniquely facilitates correction of fluorescence inner-filter effects to yield quantitative fluorescence spectral information that is largely independent of component concentration. This is significant because it allows one to effectively monitor quantitative component changes using multivariate methods and to generate and evaluate spectral libraries...
January 16, 2018: Methods and Applications in Fluorescence
https://www.readbyqxmd.com/read/29334476/biological-control-of-botrytis-cinerea-interactions-with-native-vineyard-yeasts-from-washington-state
#11
Xuefei Wang, Dean A Glawe, Elizabeth K Kramer, David M Weller, Patricia Ann Okubara
Native yeasts are of increasing interest to researchers, grape growers, and vintners because of their potential for biocontrol activity, and their contributions to the aroma, flavor and mouthfeel qualities of wines. To assess biocontrol activity, we tested 11 yeasts from Washington vineyards, representing isolates of Candida saitoana, Curvibasidium pallidicorallinum, Metschnikowia chrysoperlae, Metschnikowia pulcherrima, Meyerozyma guilliermondii, Saccharomyces cerevisiae and Wickerhamomyces anomalus, for ability to colonize 'Thompson Seedless' grape berries, inhibit the growth of Botrytis cinerea in vitro, and suppress disease symptoms on isolated berries...
January 15, 2018: Phytopathology
https://www.readbyqxmd.com/read/29333107/cryptography-standards-in-quantum-time-new-wine-in-old-wineskin
#12
Lidong Chen
No abstract text is available yet for this article.
July 2017: IEEE Security & Privacy
https://www.readbyqxmd.com/read/29332836/fluorescent-and-colorimetric-dual-mode-aptasensor-for-thrombin-detection-based-on-target-induced-conjunction-of-split-aptamer-fragments
#13
Wenna Duan, Xiuzhong Wang, Haixia Wang, Feng Li
Since the lack of detection diversity of the single-signal readout strategy, it is urgent to develop fast and multisignal assay strategies. A highly selective and sensitive assay method with colorimetric and fluorometric dual signals readouts is presented in this paper. It is based on the principle that the target induced conjunction of split aptamer fragments assembled on the surface of Au nanoparticles (AuNPs). In the presence of targets, the color of solution changed from wine red to blue and can be measured both visual inspection and spectrophotometry because of the aggregation of AuNPs...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29330878/identification-of-tentative-marker-in-corvina-and-primitivo-wines-with-cmc-se
#14
Pavel Kessler, Markus Godejohann
This paper introduces CMC-se - a program for computer assisted structure elucidation. In the experimental part, the combination of modern analytical methods (LC-SPE-NMR/MS) and structure elucidation software is used for the identification of tentative markers in red wines.
January 13, 2018: Magnetic Resonance in Chemistry: MRC
https://www.readbyqxmd.com/read/29330778/isotopic-exchange-hplc-hrms-ms-applied-to-cyclic-proanthocyanidins-in-wine-and-cranberries
#15
Edoardo Longo, Fabrizio Rossetti, Matteo Scampicchio, Emanuele Boselli
Cyclic B-type proanthocyanidins in red wines and grapes have been discovered recently. However, proanthocyanidins of a different chemical structure (non-cyclic A-type proanthocyanidins) already known to be present in cranberries and wine possess an identical theoretical mass. As a matter of fact, the retention times and the MS/MS fragmentations found for the proposed novel cyclic B-type tetrameric proanthocyanidin in red wine and the known tetrameric proanthocyanidin in a cranberry extract are herein shown to be identical...
January 12, 2018: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/29330706/color-stability-of-different-composite-resins-after-polishing
#16
Stefano Ardu, O Duc, E Di Bella, I Krejci
The goals of the present study were to evaluate, in vitro, the staining of different composite resins submitted to different common beverages, and to compare the staining effect of each of these solutions. A total of 288 specimens were randomly divided into six groups and immersed for 4 weeks in five staining solutions represented by red wine, orange juice, coke, tea and coffee or in artificial saliva as a control group. When analyzed over a black background, mean ΔE00 values varied from 0.8 for Venus Diamond, Saremco Microhybrid and ELS in saliva and Estelite Posterior in coke to 37...
January 12, 2018: Odontology
https://www.readbyqxmd.com/read/29329885/innoscent-system-advancing-flavor-analysis-using-an-original-gas-chromatographic-analytical-device
#17
A Villière, S Le Roy, C Fillonneau, C Prost
Despite continuous advances in analytical and physiological knowledge, the comprehension of an aroma is still a challenge. Gas chromatography coupled to olfactometry (GC-O) is an efficient method to identify and estimate individual potential of odorants, but there is a gap between this individual characterization and the effective contribution of compounds in the mixture, which is due to complex chemical and perceptual interactions. Therefore, recombination and omission experiments are often performed to achieve an understanding of food aromas...
December 24, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29329871/isolation-of-proanthocyanidins-from-red-wine-and-their-inhibitory-effects-on-melanin-synthesis-in-vitro
#18
Takahiro Fujimaki, Shoko Mori, Manabu Horikawa, Yuko Fukui
The red wines made from Vitis vinifera were identified as skin-whitening effectors by using in vitro assays. OPCs in the wine were evaluated for tyrosinase activity and melanogenesis. Strong tyrosinase inhibitory activity was observed in fractions with high oligomeric proanthocyanidin (OPC) content. Among OPC dimers, a strong inhibitory effect on tyrosinase was observed with OPCs which contain (+)-catechin as an upper unit. Melanogenesis inhibitory effect was observed with OPCs which have (-)-epicatechin as upper units...
May 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29329868/a-procedure-for-the-measurement-of-oxygen-consumption-rates-ocrs-in-red-wines-and-some-observations-about-the-influence-of-wine-initial-chemical-composition
#19
Almudena Marrufo-Curtido, Vanesa Carrascón, Mónica Bueno, Vicente Ferreira, Ana Escudero
The rates at which wine consumes oxygen are important technological parameters for whose measurement there are not accepted procedures. In this work, volumes of 8 wines are contacted with controlled volumes of air in air-tight tubes containing oxygen-sensors and are further agitated at 25 °C until O2 consumption is complete. Three exposure levels of O2 were used: low (10 mg/L) and medium or high (18 or 32 mg/L plus the required amount to oxidize all wine SO2). In each oxygen level, 2-4 independent segments following pseudo-first order kinetics were identified, plus an initial segment at which wine consumed O2 very fast...
May 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29329837/the-fate-and-enantioselective-behavior-of-zoxamide-during-wine-making-process
#20
Xinglu Pan, Fengshou Dong, Na Liu, Youpu Cheng, Jun Xu, Xingang Liu, Xiaohu Wu, Zenglong Chen, Yongquan Zheng
The fate of zoxamide and its enantiomers were evaluated in detail during wine-making process. The enantiomers of zoxamide were separated and determined by ultra-high-performance liquid chromatography coupled with tandem mass spectrometry (UHPLC-MS/MS) after each processing procedure including washing, peeling, fermentation and clarification. Significant enantioselectivity was observed in all three treatments with the half-lives of R-zoxamide and S-zoxamide estimated to be 45.6 and 52.9 h in Group A, 45.0 and 52...
May 15, 2018: Food Chemistry
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