Search results for "Dyes"

showing 10 items of 324 documents

Synthesis of fluorinated Thomsen-Friedenreich antigens: direct deoxyfluorination of αGalNAc-threonine tert-butyl esters.

2011

Selectively 6-fluorinated analogs of the tumor-associated T(N) antigen Fmoc-Thr(α-O-GalNAc)-OtBu can be efficiently prepared using DAST-mediated de(hydr)oxyfluorination reactions of preformed and orthogonally protected glycosyl amino esters without affecting the labile protecting groups and O-glycosidic linkages. The resulting mono- and difluorinated T(N) analogs are interesting building blocks for non-hydrolyzable mucin-type antigen mimetics, as illustrated by the unprecedented synthesis of two different multiply fluorinated Thomsen-Friedenreich derivatives. The reported deoxyfluoro antigen analogs represent important functional probes for carbohydrate-binding proteins and glycosyl-process…

chemistry.chemical_classificationTert butylThreonineAcetylgalactosamineAmino estersCarbohydrate chemistryStereochemistryOrganic ChemistryFluorineBiochemistrychemistry.chemical_compoundEnzymechemistryAntigenGlycosylAntigens Tumor-Associated CarbohydratePhysical and Theoretical ChemistryThreonineFluorescent DyesOrganicbiomolecular chemistry
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First Chemosensor for Selective Detection and Quantification of L-4-Hydroxyproline in Collagen and Other Bio Samples.

2017

Amino pyridine-based rhodamine conjugate (APR) has been developed as a first chemosensor for selective detection and quantification of L-4-Hydroxyproline (Hyp). The “turn-on” fluorescence property of the chemosensor makes it unique for easy estimation of Hyp in collagen and biological samples. peerReviewed

collagenPyridines010402 general chemistry01 natural sciencesAnalytical ChemistryRhodaminesRhodamine03 medical and health scienceschemistry.chemical_compoundHydroxyprolineamino pyridine-based rhodamine conjugate0302 clinical medicinebio samplesPyridinehydroxyprolineta116Density Functional TheoryFluorescent DyesChromatographyRhodaminesFluorescence0104 chemical sciencesselective detectionHydroxyprolinechemistry030220 oncology & carcinogenesischemosensorsCollagenConjugateAnalytical chemistry
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On the synthesis of functionalized porphyrins and porphyrin conjugates via β-aminoporphyrins

2016

International audience; The synthesis of functionalized porphyrins and their conjugates from meso-tetraarylporphyrins through the acylation and the oxidation of beta-aminoporphyrins was investigated. 2,3-Dioxochlorins were prepared by the oxidation of a variety of beta-aminoporphyrins and subsequently used in a condensation reaction with functionalized aromatic aldehydes and ammonium acetate to form beta-functionalized porphyrins bearing a fused imidazole ring. Under optimized experimental conditions both reactions tolerate various functional groups and afford the products in an appropriate overall yield. The mildness and usefulness of this methodology are illustrated by several examples in…

coordination010402 general chemistryRing (chemistry)01 natural sciences[ CHIM ] Chemical SciencesCatalysisphotoinduced electron-transferAcylationchemistry.chemical_compoundMaterials Chemistrypolycyclic compoundsImidazoleOrganic chemistry[CHIM]Chemical Sciencesalpha-dionesbuilding-blockspyrrolic position010405 organic chemistrysensitized solar-cellsbodipy dyesGeneral Chemistryefficient peripheral functionalizationCondensation reactionCombinatorial chemistryPorphyrin0104 chemical scienceswater-solubilizationchemistryYield (chemistry)systemsAmmonium acetateConjugate
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2-[4-(Di­methyl­amino)­phen­yl]-3,3-di­fluoro-3H-naphtho­[1,2-e][1,3,2]oxaza­borinin-2-ium-3-uide

2017

In the title compound, C19H17BF2N2O, a twist about the N—C single bond is observed, making the cross conjugation not as efficient as in the case of a planar structure. The borone complex has tetrahedral geometry. In the crystal, molecules are conected by weak C—H...F hydrogen bonds.

crystal structureBODIPY dyes010405 organic chemistryChemistryHydrogen bondCrystal structure010403 inorganic & nuclear chemistry01 natural sciences0104 chemical sciencesCrystalCrystallographyflurophoreslcsh:QD901-999Single bondCross-conjugationlcsh:CrystallographyIUCrData / International Union of Crystallography
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Analiza etykiet produktów żywnościowych dostępnych w obrocie handlowym w Polsce pod kątem obecności barwników

2016

Barwniki spożywcze są nieodzownym elementem produkcji. Ich zawartość w artykułach żywnościowych jest ściśle limitowana obostrzeniami prawnymi. Ograniczenia zawartości poszczególnych barwników lub nawet zakaz ich stosowania w niekutych krajach związany jest z potencjalnym zagrożeniem dla zdrowia konsumenta. Celem przeprowadzonych badań była ocena występowania barwników w różnych kategoriach produktów spożywczych dostępnych w obrocie handlowym na terenie Opolszczyzny, w oparciu o składy podane na opakowaniach. Materiał badawczy stanowiło 197 produktów spożywczych różnych marek przyporządkowanych do 8 kategorii. Analizę składu artykułów spożywczych dokonano w oparciu o informacje zawarte przez…

food additivessubstancje dodatkowe żywnościfood dyesbarwniki spożywcze
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MAHONIA AQUIFOLIUM AS A PROMISING RAW MATERIAL FOR THE FOOD INDUSTRY

2017

The development of the food industry leads to the expansion of the range of processed raw materials. Mahonia aquifolium today can be attributed to the non-traditional agricultural plants. However, the analysis of the chemical composition of the fruits showed that they contain significant amount of carbohydrates, vitamin C, various minerals, which recommend it for a wider use in the diet. Also due to the presence in the fruits of Mahonia aquifolium anthocyanins can extend of the use as raw material for natural anthocyanin dyes obtaining.

fungifood and beveragesvitamin Clcsh:TP1-1185mineralslcsh:Chemical technologyanthocyaninsnatural dyesScientific Study & Research: Chemistry & Chemical Engineering, Biotechnology, Food Industry
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Investigation of photoluminescence and amplified spontaneous emission properties of cyanoacetic acid derivative (KTB) in PVK amorphous thin films

2018

This work was supported by European Regional Development Fund within the Project No. 1.1.1.1/16/A/046 and A.Riekstins SIA “Mikrotīkls” donation, administered by University of Latvia Foundation.

guest-host systemAmplified spontaneous emissionQuenching (fluorescence)Materials sciencePhotoluminescenceDye lasercyanoacetic acid derivativeQuantum yieldglass forming low molecular weight compounds02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnologyPhotochemistryThreshold energy7. Clean energy01 natural sciences0104 chemical sciencesAmorphous solidamplified spontaneous emission:NATURAL SCIENCES:Physics [Research Subject Categories]0210 nano-technologyLuminescencelaser dyesOrganic Electronics and Photonics: Fundamentals and Devices
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The use of botanical raw materials in hair dyeing

2021

Rynek kosmetyczny bogaty jest w produkty umożliwiające zmianę koloru włosów. Dostępne są trzy możliwości koloryzacji chemicznej zależne od czasu utrzymywania się docelowego koloru. Wśród nich wyróżnia się farbowanie krótkotrwałe, półtrwałe oraz długotrwałe. Przy użyciu składników syntetycznych możliwe jest uzyskanie pełnego przekroju kolorystycznego. Doniesienia o niepożądanych skutkach ubocznych farb chemicznych, zarówno dotyczących skóry głowy jak i struktury włosów przemawiają za powrotem naturalnych sposobów koloryzacji włosów, i za rozwojem tego kierunku. Celem opracowania było przybliżenie możliwości zastosowania surowców roślinnych celem koloryzacji włosów. Scharakteryzowano następuj…

hair dyesynthetic dyesnaturalne pigmentyfarbowanie włosówsurowce roślinnenatural pigmentsbotanical raw materialssyntetyczne barwnikiAesthetic Cosmetology and Medicine
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A new simple chromo-fluorogenic probe for NO2 detection in air.

2015

[EN] A new chromo-fluorogenic probe, consisting of a biphenyl derivative containing both a silylbenzyl ether and a N,N-dimethylamino group, for NO2 detection in the gas phase has been developed. A clear colour change from colourless to yellow together with an emission quenching was observed when the probe reacted with NO2. A limit of detection to the naked eye of about 0.1 ppm was determined and the system was successfully applied to the detection of NO2 in realistic atmospheric conditions.

inorganic chemicalsGas phase reactionsAnalytical chemistryEtherPhotochemistryNO2Nitric Oxidecomplex mixturesCatalysisGas phasechemistry.chemical_compoundQUIMICA ORGANICAChromogenic detectionFluorescent DyesDetection limitBiphenylEmission quenchingSIMPLE (dark matter experiment)Molecular StructureSensorsAirOrganic ChemistryQUIMICA INORGANICAGeneral Chemistryrespiratory systemchemistryChromogenic CompoundsNaked eyeDerivative (chemistry)Chemistry (Weinheim an der Bergstrasse, Germany)
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Facile Synthesis of Fluorescent Polymer Nanoparticles by Covalent Modification-Nanoprecipitation of Amine-Reactive Ester Polymers

2015

Emission wavelength control in fluorescent nanoparticles (NPs) is crucial for their applications. In the case of inorganic quantum dots or dye-impregnated silica NPs, such a control is readily achieved by changing the size of the particles or choosing appropriate fluorescent dyes, respectively. A similar modular approach for controlling the emission wavelength of fluo-rescent polymer NPs, however, is difficult. This article reports on fluorescent polymer NPs, the synthesis of which provides a platform for a modular approach towards the preparation of fluorescent NPs of desired emission wavelength. Atom-transfer radical polymerization (ATRP) is employed to synthesize reactive ester polymers,…

inorganic chemicalschemistry.chemical_classificationMagnetic Resonance SpectroscopyMaterials sciencePolymers and PlasticsPolymersAtom-transfer radical-polymerizationOrganic ChemistryDispersityRadical polymerizationtechnology industry and agricultureNanoparticleQuantum yieldEstersPolymerrespiratory systemPhotochemistryFluorescencePolymerizationchemistryQuantum dotMaterials ChemistryNanoparticlesAminesFluorescent DyesMacromolecular Rapid Communications
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