Search results for "Aqueous medium"

showing 3 items of 33 documents

Retention/release equilibrium of aroma compounds in fat-free dairy gels

2010

BACKGROUND: The replacement of fat by thickeners in fat-free yoghurts leads to an important modification of aroma compound partitioning, with an impact on aroma perception. Investigation of retention/release equilibria allows a good understanding of aroma compound behaviour depending on food composition. RESULTS: Vapour/liquid equilibria of ten aroma compounds (two esters, two ketones, three aldehydes and three alcohols) in several media were studied to investigate the influence of pectin addition to fat-free dairy gel on the retention/release equilibrium. The partition coefficient of each aroma compound was measured by headspace analysis at equilibrium in six media (pure water, low-methoxy…

food.ingredientPectinPolysaccharide01 natural sciencesPhase TransitionDAIRY GELchemistry.chemical_compound0404 agricultural biotechnologyfoodPECTINAROMA RELEASE[SDV.IDA]Life Sciences [q-bio]/Food engineeringAroma compoundFood scienceAromaHYDROPHOBICITYchemistry.chemical_classificationVolatile Organic CompoundsNutrition and DieteticsChromatographyAqueous mediumbiologyFood additive010401 analytical chemistryfood and beveragesFood composition data04 agricultural and veterinary sciencesbiology.organism_classificationDietary Fats040401 food science0104 chemical sciencesPartition coefficientKineticschemistryPectinsDairy ProductsGelsHydrophobic and Hydrophilic InteractionsAgronomy and Crop ScienceFood ScienceBiotechnologyJournal of the Science of Food and Agriculture
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Immobilized Pd on magnetic nanoparticles bearing proline as a highly efficient and retrievable Suzuki–Miyaura catalyst in aqueous media

2015

A magnetically retrievable nanocatalyst was evaluated for amicrowave assisted Suzuki–Miyaura reaction in aqueous media.Excellent yields and conversions were obtained with low Pd loadings(down to 0.01 mol% Pd). It was stable up to 6 months in waterunder aerobic conditions and efficiency remained unaltered evenafter 7 repeated cycles. Refereed/Peer-reviewed

magnetic nanoparticlesProlineMetal Nanoparticles010402 general chemistry01 natural sciencesMicrowave assistedCatalysisCatalysisSuzuki-MiyauraInorganic ChemistryMagneticsMicroscopy Electron Transmission[CHIM]Chemical SciencesOrganic chemistryProlineMetal nanoparticlesComputingMilieux_MISCELLANEOUSAqueous medium010405 organic chemistryChemistryWaterPd loadings0104 chemical sciencesMagnetic nanoparticlesPalladiumNuclear chemistryDalton Transactions
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Speciation of dimethyltin(IV) – and trimethyltin(IV) – carbocysteinate and – glutamate systems in aqueous media

2008

The formation of complex species in the dimethyltin(IV) and trimethyltin(IV)-carboxymethyl-L-cysteinate (carbocysteinate) systems in NaClaq, at different ionic strengths, and in a multicomponent Na+, K+, Ca2+, Mg2+, Cl- and SO42- medium representative of the seawater major composition, is discussed. Experimental results give evidence for the formation of the following species (L¼carbocysteinate): [(CH3)2Sn(L)]0, [(CH3)2Sn(HL)]+, [(CH3)2Sn(OH)(L)]-, [(CH3)2Sn(OH)2(L)]2- in the DMT–CCYS system, and [(CH3)3Sn(HL)]0, [(CH3)3Sn(L)]- and [(CH3)3Sn(OH)(L)]2- in the TMT-CCYS system. The ionic strength dependence of formation constants was taken into account by an extended Debye Huckel type equation…

organotin(IV) compounds; carboxymethyl-L-cysteinate; glutamateChemical Health and SafetyAqueous mediumChemistrydependence on ionic strength of formation constantHealth Toxicology and Mutagenesismedia_common.quotation_subjectInorganic chemistryComplex formationorganotin(IV) compoundGlutamate receptormixed ionic mediaIonic bondingglutamateToxicologycarboxymethyl-L-cysteinateSpeciationspeciationcomplex formationOrganic chemistrySettore CHIM/01 - Chimica Analiticamedia_commonChemical Speciation & Bioavailability
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