Tag: M.W=150-200

Arcari, Stefany Grutzmann published the artcileAroma profile and phenolic content of merlot red wines produced in high-altitude regions in Brazil, Product Details of C11H22O2, the main research area is aroma phenolic Merlot red wine high altitude Brazil.

In Brazil, wine-growing regions of high altitude have been evaluated for the cultivation of grapes destined for the production of quality wines. In this study the phenolic content, the volatile compounds profile and the in vitro antioxidant activity of samples produced in Agua Doce, Campos Novos and Tangara were determined using spectrophotometric and chromatog. techniques. A total of 95 volatile compounds were identified in the samples analyzed, of which borneol is reported in Brazilian Merlot wines for the first time. The quant. results showed that the most important volatile compounds for wine aroma were esters, fatty acids, 1-hexanol and 2-phenylethanol alcs., and C13-norisoprenoids β-damascenone and α-ionone. The phenolic content observed was comparable to the results obtained for Merlot red wines from other regions in Brazil and in other countries. Also, the wine samples were effective in capturing the free radicals DPPH and ABTS.

Quimica Nova published new progress about Altitude (high). 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Product Details of C11H22O2.

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

Braunschmid, Herbert published the artcileFloral scent and pollinators of Cypripedium calceolus L. at different latitudes, Name: Benzyl acetate, the main research area is Cypripedium pollinator floral scent.

Floral scent is an important trait in plant-pollinator interactions. It not only varies among plant species but also among populations within species. Such variability might be caused by various non-selective factors, or, as has been shown in some instances, might be the result of divergent selective pressures exerted by variable pollinator climates. Cypripedium calceolus is a Eurasian deceptive orchid pollinated mainly by bees, which spans wide altitudinal and latitudinal gradients in mainly quite isolated populations. In the present study, we investigated whether pollinators and floral scents vary among different latitudes. Floral scents of three C. calceolus populations in the Southern Alps were collected by dynamic headspace and analyzed by gas chromatog. coupled to mass spectrometry (GC/MS). These data were completed by previously published scent data of the Northern Alps and Scandinavia. The scent characteristics were compared with information on pollinators recorded for present study or available in the literature. More than 80 scent compounds were overall recorded from plants of the three regions, mainly aliphatics, terpenoids, and aromatics Seven compounds were found in all samples, and most samples were dominated by linalool and octyl acetate. Although scents differed among regions and populations, the main compounds were similar among regions. Andrena and Lasioglossum species were the main pollinators in all three regions, with Andrena being relatively more abundant than Lasioglossum in Scandinavia. We discuss natural selection mediated by pollinators and neg. frequency-dependent selection as possible reasons for the identified variation of floral scent within and among populations and regions.

Diversity published new progress about Andrena bicolor. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Name: Benzyl acetate.

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

Taghizadehfard, Mahsa published the artcileViscosity modeling of fatty acid esters and biodiesels based on friction theory and perturbed hard-dimer-chain equation of state, Computed Properties of 110-42-9, the main research area is fatty acid ester biodiesel friction theory viscosity PHDC EOS.

This work deals with the modeling of dynamic viscosities of several fatty acid esters (FAEs) and biodiesels based on the friction theory (FT) along with a perturbed hard-dimer-chain equation of state (PHDC EOS). The model used three mol. parameters (ε, σ, m) and liquid d. as well, all of which were estimated from the PHDC EOS. The PHDC EOS could predict the d. and isothermal compressibility coefficients in 278.15-393.15 K range and pressures up to 210 MPa with the average absolute relative deviations (AARDs) of 0.52% and 4.77%, resp. Then, the proposed FT-based model has been employed for predicting the dynamic viscosities of several FAEs and biodiesels in 293.15-393.15 K and pressures up to 200 MPa. The model predicted 892 exptl. data points for dynamic viscosities of 10 FAEs and 3 biodiesels with the AARD of 1.70%. Further, the degree of accuracy of proposed model has also been compared with some semi-theor. and empirical approaches. Our comparison results revealed the superiority of the proposed model against the literature approaches.

Journal of Molecular Liquids published new progress about Avogadro number. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Computed Properties of 110-42-9.

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

Taghizadehfard, Mahsa published the artcileViscosity modeling of fatty acid esters and biodiesels based on friction theory and perturbed hard-dimer-chain equation of state, Application of Methyl octanoate, the main research area is fatty acid ester biodiesel friction theory viscosity PHDC EOS.

This work deals with the modeling of dynamic viscosities of several fatty acid esters (FAEs) and biodiesels based on the friction theory (FT) along with a perturbed hard-dimer-chain equation of state (PHDC EOS). The model used three mol. parameters (ε, σ, m) and liquid d. as well, all of which were estimated from the PHDC EOS. The PHDC EOS could predict the d. and isothermal compressibility coefficients in 278.15-393.15 K range and pressures up to 210 MPa with the average absolute relative deviations (AARDs) of 0.52% and 4.77%, resp. Then, the proposed FT-based model has been employed for predicting the dynamic viscosities of several FAEs and biodiesels in 293.15-393.15 K and pressures up to 200 MPa. The model predicted 892 exptl. data points for dynamic viscosities of 10 FAEs and 3 biodiesels with the AARD of 1.70%. Further, the degree of accuracy of proposed model has also been compared with some semi-theor. and empirical approaches. Our comparison results revealed the superiority of the proposed model against the literature approaches.

Journal of Molecular Liquids published new progress about Avogadro number. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Application of Methyl octanoate.

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

Rasulov, Suleiman M. published the artcilePpT and liquid-gas phase transition properties (PS,pS,TS) of binary n-hexane + methyl octanoate mixture near the critical point of pure n-hexane, Recommanded Product: Methyl octanoate, the main research area is hexane methyl octanoate binary mixture liquid gas phase transition.

PρT and phase transition properties (PS,ρS,TS) of the dilute binary mixture of n-hexane + Me octanoate have been studied near the critical point of pure n-hexane (solvent). The measurements were performed along 11 liquid, vapor and near-critical isochores between (39.3 and 621.1) kg·m-3 over a temperature range from (293 to 622) K at pressures up to 17.7 MPa for the fixed concentration of x = 0.088 mol fraction (or 0.05 mass fraction) of Me octanoate. The measurements were made using a constant-volume piezometer technique. The study was concentrated in the single – and two- phase regions near the critical point of pure n-hexane to precisely determine the phase boundary properties (PS,ρS,TS) and the critical property (PC,ρC,TC) data of the mixture The measured critical property data for the mixture were used to study of the isomorphic critical behavior of strongly singular properties such as isothermal compressibility KTX and isobaric heat capacity CPX along the critical isochore and the critical isotherm, i.e., Fisher renormalization (mixture-like behavior) of the critical exponent, -γγ/(1 – α), for strongly singular properties of mixture under study. The measured PρT data were also used to estimate the values of phys. meaningful (theor. important) parameters such as characteristic reduced temperature τ1and d. differences Δρ1 of the mixture We found that KTX and CPX of the studied mixture exhibit pure-like behavior along the critical isochore at temperature above 508.52 K (slightly above the critical temperature of pure n-hexane, 507.44 K) and along the critical isotherm at densities above 279.82 kg·m-3 (above the critical d. of pure n-hexane, 232.8 kg·m-3). The measured data were used to estimate the Krichevskii parameter Kkr,structural (Nexc)and volumetric (Vâˆ?) properties of the dilute mixture near the critical point of pure solvent (n-hexane).

Fluid Phase Equilibria published new progress about Binary mixtures. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Recommanded Product: Methyl octanoate.

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

Rani, Manju published the artcileSolid-liquid equilibrium and kinematic viscosity of binary mixture of fatty acid alkyl esters, Quality Control of 110-42-9, the main research area is solid liquid equilibrium kinematic viscosity binary mixture fatty acid.

The separation and recovery of fatty acid alkyl esters (FAAE) is of great significance for various industries. Crystallization is a well-suited separation process for fatty acid mixtures which may be evolved by the understanding of solid-liquid equilibrium (SLE). The SLE and kinematic viscosity (v) at (T=298.15-318.15 K) and (P=0.1 mPa) for binary mixture of FAAE: Me decanoate (1)+ethyl decanoate or Me dodecanoate or Me tetradecanoate (2) has been studied. The deviation in kinematic viscosity (Δv) data was derived using exptl. v data. The measured SLE exhibit general single eutectic point like other organic mixtures The SLE data fit well with universal quasi-chem. (UNIQUAC) equation. The v values were interrelated using different equations recommended by Heric-Brewer, Krishnan-Ladda, and Lulian et al. Theor. estimated values using these empirical equations are in accordance with the exptl. values with percentage standard deviation less than 0.35. The v were also analyzed by means of the McAllister equation. The Δv data were also fitted with the Redlich-Kister polynomial equation. All three binary mixtures showed neg. Δv values.

Korean Journal of Chemical Engineering published new progress about Binary mixtures. 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

Xiao, Zuobing published the artcileIdentification of key aromas of Chinese muskmelon and study of their formation mechanisms, Computed Properties of 111-11-5, the main research area is Chinese muskmelon formation mechanism key aroma identification.

The volatile compounds found in melons (Cucumis melo L.) obtained from three cultivars [Jiashi (JS), Xizhoumi17 (XZM) and Minqin (MQ)] were comprehensively analyzed by gas chromatog.-olfactometry (GC-O), gas chromatog.-mass spectrometry (GC-MS), and GC-flame photometric detection (GC-FPD). The result showed that 46, 45 and 69 volatile compounds were detected in XZM, JS and MQ samples by GC-MS, resp. Besides, 6, 8 and 9 sulfur compounds were detected by GC-FPD, resp. Di-Me sulfide, 1-propanethiol, 3-mercapto-3methylbutanol, 3-methyl-2-buten-1-thiol were detected for the first time in melon. 25 key aroma compounds were identified in MQ muskmelon by omission tests, among which (Z)-6-nonenal, (Z)-6-nonen-1-ol, 3-methylbutanal, 2-methylbutyl acetate, hexanal and Me thioacetate were particularly important. The interaction between three aroma compounds containing nine-carbon straight-chain structure and five thioesters in MQ muskmelon was studied by comparing their olfactory threshold and OAV values. Among the 18 binary mixtures, 8 mixtures showed a synergistic effect, 2 mixtures presented an additive effect, 2 mixtures showed no interaction, 6 mixtures exhibited a masking effect. There is a synergistic effect between (Z)-6-nonenal, (Z)-6-nonen-1-ol and (E, Z)-3,6-nonadien-1-ol, the aroma intensity of the mixture can be predicted by modified vector model.

European Food Research and Technology published new progress about Binary mixtures. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Computed Properties of 111-11-5.

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

Xiao, Zuobing published the artcileIdentification of key aromas of Chinese muskmelon and study of their formation mechanisms, Synthetic Route of 140-11-4, the main research area is Chinese muskmelon formation mechanism key aroma identification.

The volatile compounds found in melons (Cucumis melo L.) obtained from three cultivars [Jiashi (JS), Xizhoumi17 (XZM) and Minqin (MQ)] were comprehensively analyzed by gas chromatog.-olfactometry (GC-O), gas chromatog.-mass spectrometry (GC-MS), and GC-flame photometric detection (GC-FPD). The result showed that 46, 45 and 69 volatile compounds were detected in XZM, JS and MQ samples by GC-MS, resp. Besides, 6, 8 and 9 sulfur compounds were detected by GC-FPD, resp. Di-Me sulfide, 1-propanethiol, 3-mercapto-3methylbutanol, 3-methyl-2-buten-1-thiol were detected for the first time in melon. 25 key aroma compounds were identified in MQ muskmelon by omission tests, among which (Z)-6-nonenal, (Z)-6-nonen-1-ol, 3-methylbutanal, 2-methylbutyl acetate, hexanal and Me thioacetate were particularly important. The interaction between three aroma compounds containing nine-carbon straight-chain structure and five thioesters in MQ muskmelon was studied by comparing their olfactory threshold and OAV values. Among the 18 binary mixtures, 8 mixtures showed a synergistic effect, 2 mixtures presented an additive effect, 2 mixtures showed no interaction, 6 mixtures exhibited a masking effect. There is a synergistic effect between (Z)-6-nonenal, (Z)-6-nonen-1-ol and (E, Z)-3,6-nonadien-1-ol, the aroma intensity of the mixture can be predicted by modified vector model.

European Food Research and Technology published new progress about Binary mixtures. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Synthetic Route of 140-11-4.

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

Owen, Rhodri N. published the artcileTowards a universal ion source: Glow Flow mass spectrometry, Application In Synthesis of 110-42-9, the main research area is ion source glow flow mass spectrometry.

A helium-microplasma ion source (Glow Flow) has been developed and characterised. It is engineered to be a simple design, of low-cost and can be readily retrofitted to most modern mass spectrometers. Initial assessment of its performance has shown it to be robust, reproducible and of high sensitivity. Glow Flow provides broad non-specific detection of samples from polar through to non-polar chemistries making it of wide utility. A study of persistent organic pollutants, polyaromatic hydrocarbons, low average-mol.-mass polymers (polyethyleneimine, polyethylene glycol, and polypropylene glycol) and a complex mixture of fatty-acid Me esters by direct sample introduction using a nebulised heated nitrogen flow was conducted. The ability to make quant. measurement was investigated using Me stearate and a linear calibration plot gave a R2 = 0.999 and limit-of-detection of �00 fmol. This design is extremely stable, in operation. Typical ions commonly observed are intense protonated mol. ions, radical mol. ions, hydride abstracted ions, and oxygen adduct ions. At present this system is valuable to apply to small mol. anal. (m/z < 1000), and is easily interfaced to gas and liquid chromatog., and likely to be useful for imaging. International Journal of Mass Spectrometry published new progress about Electric current. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Application In Synthesis of 110-42-9.

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

Owen, Rhodri N. published the artcileTowards a universal ion source: Glow Flow mass spectrometry, Synthetic Route of 111-11-5, the main research area is ion source glow flow mass spectrometry.

A helium-microplasma ion source (Glow Flow) has been developed and characterised. It is engineered to be a simple design, of low-cost and can be readily retrofitted to most modern mass spectrometers. Initial assessment of its performance has shown it to be robust, reproducible and of high sensitivity. Glow Flow provides broad non-specific detection of samples from polar through to non-polar chemistries making it of wide utility. A study of persistent organic pollutants, polyaromatic hydrocarbons, low average-mol.-mass polymers (polyethyleneimine, polyethylene glycol, and polypropylene glycol) and a complex mixture of fatty-acid Me esters by direct sample introduction using a nebulised heated nitrogen flow was conducted. The ability to make quant. measurement was investigated using Me stearate and a linear calibration plot gave a R2 = 0.999 and limit-of-detection of �00 fmol. This design is extremely stable, in operation. Typical ions commonly observed are intense protonated mol. ions, radical mol. ions, hydride abstracted ions, and oxygen adduct ions. At present this system is valuable to apply to small mol. anal. (m/z < 1000), and is easily interfaced to gas and liquid chromatog., and likely to be useful for imaging. International Journal of Mass Spectrometry published new progress about Electric current. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Synthetic Route of 111-11-5.

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