Month: December 2022

Boscaino, Floriana published the artcileImpact of Saccharomyces cerevisiae and Metschnikowia fructicola autochthonous mixed starter on Aglianico wine volatile compounds, COA of Formula: C4H10OS, the main research area is Saccharomyces Metschnikowia Aglianico wine volatile; Aglianico wine; Metschnikowia fructicola; S. cerevisiae; Volatile compounds.

Non-Saccharomyces yeasts are metabolically active during grape must fermentations and can contribute with enzymes and metabolites to enhance the complexity and to define the final wine aroma. Nowadays, the use of non-Saccharomyces yeasts in combination with Saccharomyces cerevisiae is a state-of-the art strategy to improve wine composition and/or wine sensory properties. The present paper deals with the new yeast strains of Metschnikowia fructicola and S. cerevisiae, that were selected as representatives of the yeast microbiota isolated from grapes and grape juice of Aglianico cultivar. S. cerevisiae was utilized both as single strain starter and in combination with M. fructicola in exptl. fermentations of Aglianico must. The dynamic of yeast populations was evaluated during the fermentation process analyzing the wine volatile compounds profile. The volatile compounds were identified by SPME-GC/MS. The results, showed that the multiple indigenous yeast starter was able to modulate the volatile compounds profiles and improve the aromatic complexity of wine, with a higher content of esters and terpenes.

Journal of Food Science and Technology (New Delhi, India) published new progress about Almond. 505-10-2 belongs to class alcohols-buliding-blocks, name is 3-(Methylthio)propan-1-ol, and the molecular formula is C4H10OS, COA of Formula: C4H10OS.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ciotlaus, Irina published the artcileCromathographic profile of volatiles of multifloral and unifloral honey collected by Apis mellifera from Transilvania, Romania, HPLC of Formula: 124-76-5, the main research area is chromatog Apis honey Transilvania.

Chromatog. profile of volatiles organic compounds (VOCs) from several varieties of multifloral and unifloral honey produced in Transylvania, Romania, was analyzed in order to determine the differences between them. VOCs collected using solid phase microextraction (SPME) technique were analyzed by gas-chromatog. coupled with mass-spectrometry (GC-MS). The fiber used was Carboxen / PDMS (polydimethylsiloxane) 75μm. By qual. anal., a number of 98 volatiles in unifloral honey and 52 volatiles in multifloral honey were identified. The differences regarding volatile compounds of multifloral honey were observed to be between varieties from different areas of Transylvania (mountain, plain, hill and urban area) while in the case of unifloral assortments (rapeseed, acacia, sunflower and linden) differences were observed at specific compounds Compounds identified in our samples were grouped into main classes of substances: hydrocarbons, alcs., aldehydes, ketones, organic acids and their esters, furan and pyran derivatives and terpenes.

Revista de Chimie (Bucharest, Romania) published new progress about Acacia. 124-76-5 belongs to class alcohols-buliding-blocks, name is rel-(1R,2R,4R)-1,7,7-Trimethylbicyclo[2.2.1]heptan-2-ol, and the molecular formula is C10H18O, HPLC of Formula: 124-76-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Zhang, Qian published the artcileSelf-healable and reprocessible liquid crystalline elastomer and its highly thermal conductive composites by incorporating graphene via in-situ polymerization, SDS of cas: 7575-23-7, the main research area is liquid crystalline elastomer thermally conductive composite thermomech property.

The booming of modern electronic devices featuring increasing power and multi-functionalization demands novel high thermal conductive materials with various functions, such as self-healing property and high deformability, while traditional polymer-based or metallic-based materials could hardly provide. Therefore, we report a high thermal conductive and disulfide-based self-healable and reprocessible liquid crystalline elastomer (SHLCE) composite by incorporating graphene nanoplates (GNPs) fillers. The obtained GNPs/SHLCE composites exhibited desired thermal conductivity (5.08 Wm-1 K-1) when the content of GNPs was 20 wt% to the composites. Moreover, the GNPs/SHLCE composites showed intriguing recycled performance (tensile strength after recycle could maintain over 93% compared with that of original composites). Furthermore, we concluded that the improved thermal conductivity of GNPs/SHLCE composites was beneficial to the thermal induced reprocessible and shelf-healable systems.

Journal of Applied Polymer Science published new progress about Fillers. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, SDS of cas: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Coquelet, Christophe published the artcileDensity and Excess Volume for Four Systems Involving Eugenol and Furan, Recommanded Product: n-Octanol, the main research area is eugenol furan density excess four system.

D. and speed of sound measurements have been performed, at atm. pressure, using an Anton Paar digital vibrating tube densitometer for pure ethanol, 1-octanol, n-hexane, furan and eugenol, from 278.15 to 323.15 K and for the binary mixtures of furan + ethanol, furan + 1-octanol, eugenol + 1-octanol and eugenol + n-hexane from 278.15 to 323.15 K. Excess molar volumes were calculated and compared. The Redlich-Kister correlation was used to correlate the data. In order to identify the most important mol. interaction contributing to the excess molar volume, the Prigogine-Flory-Patterson theory was applied to correlate and predict the excess molar volumes of the mixtures

Journal of Solution Chemistry published new progress about Density. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Recommanded Product: n-Octanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Mirheydari, Seyyedeh Narjes published the artcileVolumetric and acoustic properties of ionic liquid, 1-hexyl-3-methylimidazolium bromide in 1-hexanol, 1-heptanol and 1-octanol at T = (298.15-328.15) K, Recommanded Product: n-Octanol, the main research area is hexyl methylimidazolium bromide ionic liquid volumetric acoustic property.

The d. ρ and speed of sound u of the binary mixtures (1-hexyl-3-methylimidazolium bromide ([HMIm][Br]) + 1-hexanol or 1-heptanol or 1-octanol) were reported at T= (298.15, 308.15, 318.15 and 328.15) K and atm. pressure. Using the exptl.-measured data, the molar volume Vm, excess molar volume , isentropic compressibility κs and isentropic compressibility deviation Δκs were calculated Also, the Jouyban-Acree and Redlich-Kister polynomial equations were used for correlation of (ρ, Vm, u and κs) and ( and Δκs), resp. The obtained percent average relative deviation %ARD and standard deviation σ show that the studied mixtures can be described well by Jouyban-Acree and Redlich-Kister equations, resp.

Physics and Chemistry of Liquids published new progress about Density. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Recommanded Product: n-Octanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Almasi, Mohammad published the artcileStudy of molecular interactions and preferential solvation in binary mixtures of cyclohexane and (C5-C10) 1-alkanol by Kirkwood-Buff integrals, COA of Formula: C8H18O, the main research area is cyclohexane alkanol binary mixture mol interaction Kirkwood Buff integral.

Mixtures formed by cyclohexane + 1-alkanol have been investigated in the framework of the Kirkwood-Buff theory of solution The alcs. considered are 1-pentanol up to 1-decanol. Data for the Kirkwood-Buff integrals, Gij excess or deficit number of mols. around the central ones, Δnij and coefficients of linear solvation, δij are reported. For solutions with a given cyclohexane, the increase in the -CH2 groups of alcs. chain causes a decrease in G12 by the following sequences: 1-decanol > 1-nonanol > 1-octanol > 1-heptanol > 1-hexanol > 1-pentanol. The comparison of G12 and other calculated parameters for cyclohexane + 1-alkanol mixtures reveals that the interactions between similar mols. are more outstanding and the decrease in the alkyl chain of alcs. leads to the weakening of interactions related to the self-association of 1-alkanol, differences in the free volumes, hydrophobic interactions, and structural changes. These trends are consistent with exptl. data on the excess molar volumes.

Fluid Phase Equilibria published new progress about Density. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, COA of Formula: C8H18O.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Fan, Shujie published the artcilePrediction of octanol-water partition coefficients for the SAMPL6- log P molecules using molecular dynamics simulations with OPLS-AA, AMBER and CHARMM force fields, Recommanded Product: n-Octanol, the main research area is octanol water partition mol dynamic; AMBER force field; CHARMM force field; Free energy perturbation; Ligand parametrization; Molecular dynamics; OPLS-AA force field; Octanol-water partition coefficient; Solvation free energy.

All-atom mol. dynamics simulations with stratified alchem. free energy calculations were used to predict the octanol-water partition coefficient log Pow of eleven small mols. as part of the SAMPL6- log P blind prediction challenge using four different force field parametrizations: standard OPLS-AA with transferable charges, OPLS-AA with non-transferable CM1A charges, AMBER/GAFF, and CHARMM/CGenFF. Octanol parameters for OPLS-AA, GAFF and CHARMM were validated by comparing the d. as a function of temperature, the chem. potential, and the hydration free energy to exptl. values. The partition coefficients were calculated from the solvation free energy for the compounds in water and pure (“”dry””) octanol or “”wet”” octanol with 27 mol% water dissolved. Absolute solvation free energies were computed by thermodn. integration (TI) and the multistate Bennett acceptance ratio with uncorrelated samples from data generated by an established protocol using 5-ns windowed alchem. free energy perturbation (FEP) calculations with the Gromacs mol. dynamics package. Equilibration of sets of FEP simulations was quantified by a new measure of convergence based on the anal. of forward and time-reversed trajectories. The accuracy of the log Pow predictions was assessed by descriptive statistical measures such as the root mean square error (RMSE) of the data set compared to the exptl. values. Discarding the first 1 ns of each 5-ns window as an equilibration phase had a large effect on the GAFF data, where it improved the RMSE by up to 0.8 log units, while the effect for other data sets was smaller or marginally worsened the agreement. Overall, CGenFF gave the best prediction with RMSE 1.2 log units, although for only eight mols. because the current CGenFF workflow for Gromacs does not generate files for certain halogen-containing compounds Over all eleven compounds, GAFF gave an RMSE of 1.5. The effect of using a mixed water/octanol solvent slightly decreased the accuracy for CGenFF and GAFF and slightly increased it for OPLS-AA. The GAFF and OPLS-AA results displayed a systematic error where mols. were too hydrophobic whereas CGenFF appeared to be more balanced, at least on this small data set.

Journal of Computer-Aided Molecular Design published new progress about Density. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Recommanded Product: n-Octanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Pinto, Camila N. published the artcileViscosities and Densities of Fatty Alcohol Mixtures from 298.15 to 338.15 K: Estimation by Kay’s Rule and Prediction by the UNIFAC-VISCO and GC-UNIMOD Group Contribution Methods, Safety of n-Octanol, the main research area is viscosity density fatty alc mixture Kay; UNIFAC VISCO UNIMOD group.

The phys. properties d. and viscosity of 21 binary mixtures composed of 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, 1-decanol, 1-undecanol, and 1-dodecanol were determined at temperatures from 298.15 to 338.15 K, stepped by 10 K. Well-known methods, based on the phys. properties of the pure compounds and their compositions in the mixtures, were used to estimate d. (simple form of Kay’s rule) and viscosity (logarithmic form of Kay’s rule). For d. values, the absolute average deviations (AADs) were no higher than 0.06%, when mass fraction was used as the unit of concentration The viscosity calculations resulted in overall AADs from 1.77% (using molar fraction as the unit of concentration) to 1.85% (using mass fraction as the unit of concentration). Addnl., the predictive capability of the UNIFAC-VISCO and GC-UNIMOD models was tested for viscosity. Satisfactory results were found for all the sets of parameters evaluated in the prediction, with AAD values less than 2%, indicating the appropriate application of these models.

Journal of Chemical & Engineering Data published new progress about Density. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Safety of n-Octanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Wang, Hao published the artcileDensities and Viscosities for the Binary Mixtures of n-Nonane with 1-Heptanol, 1-Octanol, 1-Nonanol, and 1-Decanol, Category: alcohols-buliding-blocks, the main research area is density viscosity nonane binary mixture heptanol octanol nonanol decanol.

Densities and viscosities for the binary mixtures of n-nonane/1-heptanol, n-nonane/1-octanol, n-nonane/1-nonanol, and n-nonane/1-decanol were presented in this work. The measurements were carried out using an Anton Paar digital vibrating U-tube densimeter and an Ubbelohde capillary viscometer, and the entire composition range was investigated from 303.15 to 333.15 K at atm. pressure. In addition, the excess molar volumes and viscosity deviations of the mixtures were calculated and discussed. The Redlich-Kister equation was used to correlate the two derived properties. Furthermore, the viscosities of the studied mixtures were fitted to Eyring-type models.

Journal of Chemical & Engineering Data published new progress about Density. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Henriques, Julcelly Dayara de Oliveira published the artcileFlash point and excess molar volumes of binary mixtures containing d-limonene and alcohol compounds from propanol to dodecanol, Safety of n-Octanol, the main research area is limonene excess molar volume binary mixture propanol dodecanol.

D-limonene is a monoterpene naturally found in citrus peels, especially lemons and oranges, and is responsible for their strong odor. D-Limonene has specific properties that enable its use in various industrial segments such as foods, perfumes, beverages, cosmetics, pharmaceuticals, detergents, soaps, insecticides, disinfectants, fine chems., as a biodegradable solvent, and so on. Among the ways in which limonene can be used, the mixture of d-limonene with alc. compounds has a great application potential, since alc. extracts of citrus essential oils have high solubility in aqueous solutions, reducing the occurrence of oxidation reactions as well as increasing the aromatic resistance of the mixture Thus, in this study, the d. (ρ) and excess molar volume data (VEm) of seven binary mixtures of d-limonene with 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 1-octanol, 1-decanol and 1-dodecanol were determined at 298.15 K and throughout the whole mole fraction range. The FP exptl. values were compared to FP values calculated using Liaw’s approach and the activity coefficient models UNIQUAC, NRTL, UNIFAC and Ideal, with an average deviation of (0.55, 0.57, 1.43 and 4.02) K, resp. The interaction parameters of the models UNIQUAC and NRTL were thus shown to be well adjusted and provide a better description of the FP behavior than the ideal and UNIFAC models, as expected.

Journal of Chemical Thermodynamics published new progress about Density. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Safety of n-Octanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts