Esters-buliding-blocks

Boscaino, Floriana published the artcileImpact of Saccharomyces cerevisiae and Metschnikowia fructicola autochthonous mixed starter on Aglianico wine volatile compounds, Application of Ethyl nonanoate, 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. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Application of Ethyl nonanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Chen, Chen published the artcileCharacterisation of the key volatile compounds of commercial Gouda cheeses and their contribution to aromas according to Chinese consumers’ preferences, Quality Control of 110-42-9, the main research area is volatile Gouda cheeses contribution aroma Chinese consumer preference; Aroma compounds; Aroma recombination and omission; Gas chromatography–mass spectrometry; Gas chromatography–olfactometry; Gouda cheese; Sensory evaluation.

A systematic flavoromics-based anal. of samples of 12 com. available Gouda cheeses was performed to determine their key volatile components, the contribution of these components to the aromas of the cheeses, and which aromas were preferred by a panel of Chinese consumers. The sensory anal. results show that the Chinese consumers preferred young and medium cheeses, and that sensory attributes such as ‘milk’ and ‘cream’ were the most popular. Seventy-seven aroma compounds were identified by gas chromatog.-mass spectrometry, and 28 of these were determined to be aroma-active compounds by gas chromatog.-olfactometry anal. and calculation of their odor activity values. Partial least-squares anal. revealed that compounds such as diacetyl and acetoin correlated with aromas preferred by the Chinese consumers, while isobutyric acid, hexanoic acid and valeric acid correlated with aromas disliked by the Chinese consumers. Finally, the flavor contribution of each aroma-active compound was validated through aroma reorganisation and omission experiments

Food Chemistry: X published new progress about Almond. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Quality Control of 110-42-9.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Santos, Filipa published the artcileAcacia, cherry and oak wood chips used for a short aging period of rose wines: effects on general phenolic parameters, volatile composition and sensory profile, Recommanded Product: Ethyl 3-hydroxybutanoate, the main research area is acacia cherry oak wood chip wine phenol volatile composition; phenolic content; rosé wines; sensory profile; volatile composition; wood chip species.

BACKGROUND : There is a restricted knowledge about the potential impact of the use of different wood chip species on the rose wine aging process. Thus, the aim of this work was to evaluate the general phenolic parameters, aroma composition and sensory profile of rose wines during a short maturation (20 aging days) in contact with wood chips from oak, acacia and cherry. In addition, the different wood chips were added to a rose wine without a previous clarification process (unfined wine) and to a rose wine submitted to a clarification process (fined wine). RESULTS : For the brief maturation time considered, the use of different wood chips induced a tendency for an increase of phenolic content, in particular for unfined rose wine aged in contact with acacia chips. For volatile composition, the differentiation was clearer for aldehyde compounds group. Regarding sensorial overall appreciation the panel test preferred the unfined rose wine aged in contact with acacia wood chips. CONCLUSIONS : The results show that, in general, the use of different wood chip species (acacia, cherry and oak) for a brief maturation time of rose wines could play an important role in rose wine characteristics, in particular in their phenolic composition © 2019 Society of Chem. Industry.

Journal of the Science of Food and Agriculture published new progress about Acacia. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Recommanded Product: Ethyl 3-hydroxybutanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Xie, Zean published the artcileSeparation of methyl glycosides and glycerol from aqueous fraction of methyl bio-oils using nanofiltration, Category: esters-buliding-blocks, the main research area is methyl glycoside glycerol aqueous fraction bio oil nanofiltration.

The feasibility of separating small mol. organic compounds in the aqueous fraction of Me bio-oils (AFMBO) using nanofiltration (NF) and reverse osmosis (RO) membranes was studied. Four kinds of com. available NF and RO membranes were studied preliminarily by using model solutions (aqueous solution of Me glycosides and glycerol). The membrane module was spiral wound, which is a more suitable format for industrialization than the flat-sheet format for dead-end filtration. The NF400-600 membrane exhibited the best separation performance; the permeate flux was 48.6 L/(m2·h), the Me glucosides (MEG) rejection ratio was 95.4%, and the transmission of glycerol was 81.0% with an initial concentration of 10 g/L (0.4 MPa, 45 °C). Compared with the model solution, the NF performance of AFMBO, which included permeate flux, rejection of MEG, transmission of glycerol, and separation of the other components in AFMBO, was investigated. The more complex constituents of AFMBO led to NF400-600 permeability and separating property decline compared with the model solution in the same operating conditions; meanwhile more serious and even irreversible membrane fouling occurred. This research provided a reference for membrane separation industrial feasibility and application of AFMBO.

BioResources published new progress about Fouling. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Category: esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Wang, Xiaojie published the artcileLiquid viscosities for methyl hexanoate, methyl heptanoate, methyl caprylate, and methyl nonanoate at high pressures, Formula: C9H18O2, the main research area is methyl hexanoate heptanoate caprylate nonanoate liquid viscosity.

The exptl. measurements for liquid viscosities of four fatty acid Me esters, including Me hexanoate, Me heptanoate, Me caprylate, and Me nonanoate, were carried out with a falling-cylinder viscometer. For the present measurement, the temperature ranges were from 292 K to 362 K and the pressure was reached to 30 MPa. The combined expanded relative uncertainty of the viscosity measurements was within 0.03 with 0.95 confidence level. The viscosity data for each studied esters were correlated by Andrade-Tait equation, and the average absolute relative deviation between the exptl. data and calculated values is 0.31%, 0.44%, 0.38%, and 0.25% for Me hexanoate, Me heptanoate, Me caprylate, and Me nonanoate, resp. The maximum absolute relative deviation is 1.09%, 1.28%, 1.28%, and 0.75%.

Journal of Chemical Thermodynamics published new progress about Density. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Formula: C9H18O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Wang, Xiaojie published the artcileLiquid viscosities of ethyl caprylate and ethyl caprate at elevated temperatures and pressures, Safety of Ethyl octanoate, the main research area is ethyl caprylate caprate viscosity temperature pressure.

In this work, the high-pressure liquid viscosities of Et caprylate and Et caprate were measured at the temperatures from 303 K to 362 K and pressures up to 30 MPa. The measurements were carried out based the falling-cylinder viscosity measurement system which was established in our laboratory The combined expanded relative uncertainty of the present measurement was <0.03 with a confidence level of 0.95. The high-pressure viscosity values were correlated with Andrade-Tait equation. The average relative deviation between exptl. data and calculated results from Andrade-Tait equation for Et caprylate and Et caprate was 0.38% and 0.73%, resp. The maximum relative deviation was 1.32% and 1.96%, resp. Journal of Molecular Liquids published new progress about Density. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Safety of Ethyl octanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Xue, Sa published the artcileGeneral models for prediction densities and viscosities of saturated and unsaturated fatty acid esters, Application of Ethyl nonanoate, the main research area is saturated unsaturated fatty acid ester prediction density.

Biodiesel is a very promising renewable energy, whose properties are determined by fatty acid esters in it. The work aims to develop prediction models based on their mol. structure to estimate the d. and viscosity of saturated and unsaturated fatty acid esters in a wide range of temperature and pressure. Densities and viscosities of Et hexanoate and Et nonanoate were measured from 313.15 K to 363.15 K and at pressures up to 15 MPa to get more exptl. data. The effect of temperature, pressure and mol. structure on d. and viscosity based on the exptl. data in this work and collected from literature found an interesting phenomenon that densities decrease with the increasing carbon atoms number in the chain of the saturated fatty acid esters at low temperature, but there is an opposite trend at high temperature Two models derived from the Tait equation were proposed for densities with the average absolute relative deviation of 0.15% for saturated fatty acid Me esters (FAMEs), 0.13% for saturates fatty acid Et esters (FAEEs), 0.17% for unsaturated FAMEs, 0.06% for unsaturated FAEEs, resp. For viscosity, two models based on the Andrade-Tait model were proposed with the average absolute relative deviation of 1.49% for saturated FAMEs, 0.92% for saturated FAEEs, 4.54% for unsaturated FAMEs and 2.15% for unsaturated FAEEs, resp.

Journal of Molecular Liquids published new progress about Density. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Application of Ethyl nonanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Wang, Xiaojie published the artcileVolumetric properties of n-hexadecane/ethyl octanoate mixtures from 293.15 K to 363.15 K and pressures up to 60 MPa, Synthetic Route of 106-32-1, the main research area is ethyl octanoate hexadecane density vapor pressure.

The densities of pure Et octanoate and n-hexadecane/ethyl octanoate mixtures were measured from 293.15 K to 363.15 K and up to 60 MPa using U-shape vibrating-tube densimeter. The results were correlated as Tait equation, the excess molar volumes, isothermal compressibilities, and isobaric thermal expansivities of the mixtures were calculated and analyzed. In addition, the parameters in the PC-SAFT equation for Et octanoate were obtained based on the high-pressure densities obtained in this work and the vapor pressure in the literatures. The densities of the mixtures were predicted by PC-SAFT equation, the absolute average deviations between the exptl. results and those calculated were less than 0.52%.

Journal of Chemical Thermodynamics published new progress about Density. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Synthetic Route of 106-32-1.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Ozeren, Husamettin D. published the artcileIn Silico Screening of Green Plasticizers for Poly(vinyl chloride), Computed Properties of 539-88-8, the main research area is polyvinyl chloride green plasticizer simulation property.

Phthalate derivative plasticizers used in poly(vinyl chloride) (PVC) processing have been a subject of concern because of their possible toxicity. Hence, there is a growing interest toward new, nontoxic, “”green”” plasticizers. In this work, the performances of biobased plasticizers including esters of succinic, levulinic, oleic, and adipic acids were compared in reference to the conventional plasticizer bis(2-ethylhexyl) phthalate (aka dioctyl phthalate or DOP). For this purpose, mol. dynamics (MD) simulations were used to determine polymer/plasticizer interactions and to predict thermomech. properties of polymer mixtures The variation of glass temperatures (Tg) of the systems was investigated, and the stabilities of the polymer/plasticizer mixtures were compared through the Flory-Huggins solubility parameter. The mech. properties were investigated through nonequilibrium MD simulations. Young’s modulus and yield strength values were predicted through stress-strain curves. The results suggest that succinic acid derivatives have the potential to replace phthalate derivatives due to their good solubility in PVC and their effectiveness in reducing the Tg.

Macromolecules (Washington, DC, United States) published new progress about Density. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Computed Properties of 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Zhao, Guanjia published the artcileThermophysical properties of fatty acid methyl and ethyl esters, Product Details of C11H22O2, the main research area is fatty acid methyl ethyl ester thermophys property.

In present study, surface light scattering (SLS) was used for the simultaneous determination of liquid surface tension and kinematic viscosity of twelve fatty acid esters, including six Me esters (FAMEs) and six Et esters (FAEEs). The SLS apparatus was firstly checked with a reference fluid n-dodecane, and a good agreement of our data from SLS with those from literatures could be found. By utilizing this apparatus, both properties were investigated in the temperature ranges between (298 and 448) K for all substances with an exception of Me myristate and Et myristate covering the temperatures between (323 and 448) K due to their high m.ps. Addnl., the liquid d. and refractive index were determined by an Anton Paar U-tube densimeter between (293 and 453) K and a refractometer from (278 to 358) K, resp. The surface tension and viscosity data obtained from the SLS experiment were fitted to the van der Waals type and the reciprocal temperature-dependent polynomial equations, resp. The quadric and linear functions were adopted to correlate the d. and refractive index data, resp. This work improves the data situation for these fatty acid esters especially at elevated temperatures and provides necessary data and models for the crucial thermophys. properties in connection with the design and optimization of the injection system of an internal combustion engine (ICE).

Journal of Chemical Thermodynamics published new progress about Density. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Product Details of C11H22O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics