Tag: M.W=150-200

Dai, Qianying published the artcileInvestigating volatile compounds’ contributions to the stale odour of green tea, HPLC of Formula: 140-11-4, the main research area is Camellia volatile compound stale odor.

Summary : This study aimed to characterize the volatiles that contribute to stale odor of green tea. Volatiles were extracted using headspace solid-phase microextraction (HS-SPME) and analyzed using gas chromatog.-mass spectrometry (GC-MS) and gas chromatog.-olfactometry (GC-O). Results showed that a total of ninety-six volatiles were identified by GC-MS, in which forty-four volatiles were screened out based on Principal component anal. (PCA) and orthogonal projections to latent structures-discriminant anal. (OPLS-DA), and thirty-nine volatiles had a significant variation at the level of 0.05 by anal. of variance (ANOVA). From GC-O anal., fifty-four aromatic volatiles with strong aroma intensity (aroma intensity above 2) were perceived. Further investigation revealed that fifteen volatiles, including 1-octen-3-ol, benzyl alc., benzaldehyde, safranal, β-cyclocitral, (E,E)-3,5-octadien-2-one, (Z,E)-3,5-octadien-2-one, di-Me adipate, dihydroactinidiolide, β-ionone, α-ionone, geranyl acetone, phenylethyl alc., Me decanoate and α-terpineol were responsible for stale odor, besides the former nine compounds were only found in stored tea.

International Journal of Food Science and Technology published new progress about Camellia sinensis. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, HPLC of Formula: 140-11-4.

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

Stevenson, Keisean A. J. M. published the artcileThermodynamics-based modelling of gas chromatography separations across column geometries and systems, including the prediction of peak widths, Recommanded Product: Methyl decanoate, the main research area is thermodn modeling gas chromatog separation across column geometries system; peak width prediction; retention prediction; thermodynamic modeling.

Thermodn.-based models have been demonstrated to be useful for predicting retention time and peak widths in gas chromatog. and two-dimensional gas chromatog. separations However, the collection of data to train the models can be time consuming, which lessens the practical utility of the method. In this contribution, a method for obtaining thermodn.-based data to predict peak widths in temperature-programmed gas chromatog. is presented. Exptl. work to collect data for peak width prediction is identical to that required to collect data for retention time prediction using approaches that we have presented previously. Using this combined approach, chromatograms including retention times and peak widths are predicted with very high accuracy. Typical errors in retention time are < 0.5%, while errors in peak width are typically < 5% as demonstrated using polycycic aromatic hydrocarbons and a mixture containing compounds with aldehyde, ketone, alkene, alkane, alc., and ester functionalities. Journal of Separation Science published new progress about Gas chromatography. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Recommanded Product: Methyl decanoate.

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

Khatun, Habiba published the artcileCharacterization of freeze-dried, oven-dried and blanched house crickets (Acheta domesticus) and Jamaican field crickets (Gryllus assimilis) by means of their physicochemical properties and volatile compounds, Computed Properties of 110-42-9, the main research area is volatile compound Achete Gryllus freeze oven drying blanching.

Edible insects are repeatedly being considered as underutilized food candidate due to their high nutritional value. Although frequent acceptance of whole insects to consumer is still challenging, incorporation of insects in food as powder or paste has been suggested to increase their acceptability. Hence, Acheta domesticus and Gryllus assimilis were subjected to freeze drying, oven drying, and blanching to acquire a clear insight on the impact of the processing methods on the nutritional and phys. properties of both species. Result showed that these three methods had limited effects on the proximate composition, fatty acid and amino acid profile but had significant impact on other parameters for both species. Vitamin B12 in A. domesticus did not change but G. assimilis changed due to the treatment. Freeze drying showed better lightness (L* value) and lower browning index for both cricket species. Oven drying and blanching resulted in lower lipid oxidation values than freeze drying for both cricket species; though lipid oxidation was in all cases well below the rejection limit. Esters were the predominant group of volatile compound in freeze and oven-dried cricket while least amount of volatiles were found in blanched cricket. The volatiles resulted from fatty acid oxidation were higher in freeze-dried crickets, while Maillard reaction products were found in oven-dried samples. Although freeze drying showed higher color quality, oven drying exerted superior effect in terms of nutritional and flavor characteristics followed by blanching treatment.

European Food Research and Technology published new progress about Acheta domesticus. 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

Khatun, Habiba published the artcileCharacterization of freeze-dried, oven-dried and blanched house crickets (Acheta domesticus) and Jamaican field crickets (Gryllus assimilis) by means of their physicochemical properties and volatile compounds, Application In Synthesis of 111-11-5, the main research area is volatile compound Achete Gryllus freeze oven drying blanching.

Edible insects are repeatedly being considered as underutilized food candidate due to their high nutritional value. Although frequent acceptance of whole insects to consumer is still challenging, incorporation of insects in food as powder or paste has been suggested to increase their acceptability. Hence, Acheta domesticus and Gryllus assimilis were subjected to freeze drying, oven drying, and blanching to acquire a clear insight on the impact of the processing methods on the nutritional and phys. properties of both species. Result showed that these three methods had limited effects on the proximate composition, fatty acid and amino acid profile but had significant impact on other parameters for both species. Vitamin B12 in A. domesticus did not change but G. assimilis changed due to the treatment. Freeze drying showed better lightness (L* value) and lower browning index for both cricket species. Oven drying and blanching resulted in lower lipid oxidation values than freeze drying for both cricket species; though lipid oxidation was in all cases well below the rejection limit. Esters were the predominant group of volatile compound in freeze and oven-dried cricket while least amount of volatiles were found in blanched cricket. The volatiles resulted from fatty acid oxidation were higher in freeze-dried crickets, while Maillard reaction products were found in oven-dried samples. Although freeze drying showed higher color quality, oven drying exerted superior effect in terms of nutritional and flavor characteristics followed by blanching treatment.

European Food Research and Technology published new progress about Acheta domesticus. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Application In Synthesis of 111-11-5.

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

Zhong, Yiliu published the artcileCombustion characteristics of aromatic-enriched oil droplets produced by pyrolyzing unrecyclable waste tire rubber, Product Details of C11H22O2, the main research area is aromatic oil droplet combustion pyrolyzing unrecyclable waste tire rubber.

The purpose of this work is to study the combustion characteristics of aromatic-enriched tire pyrolysis oil (TPO) produced from typical small vehicles and truck tires. Pyrolysis oils (NRTO: natural rubber tire oil and SRTO: synthetic rubber tire oil) from two raw radial tire materials were produced and condensed at 25 °C and 130 °C in a three-stage auger pyrolysis reactor under neg. pressure. Combustion particularities were acquired using a single-droplet suspension combustion device and evaluated by five different indicators: kinetics, flame shape, burning rates, flame stand-off ratio (FSR) and mass transfer parameters. It was found that TPO was a potential fuel with higher calorific value (40-44 MJ/kg) and lower combustion apparent activation energy (10-40 MJ/mol) than that of bio-oil and solid fuels. Oil produced from synthetic rubber and condensed at 25 °C exhibited higher stable burning rate (1.93 ± 0.03 mm2/s) than that of nature rubber pyrolysis oil. Comparing with traditional fuels, tire oil droplets displayed higher surface local heat transfer coefficient, but the mass transfer number (B â‰?2.5) and FSR (<3.1) under stable combustion conditions were much lower. The combustion behavior of TPO has partial similarity with unsaturated hydrocarbons and ester biofuels. The reported results support the well-characterized TPO condensates for subsequent atomized combustion in realistic industrial burners. Fuel Processing Technology published new progress about Activation energy. 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

Albalat, Muriel published the artcileAn enzymatic acetal/hemiacetal conversion for the physiological temperature activation of the alkoxyamine C-ON bond homolysis, Application of Benzyl acetate, the main research area is alkoxylamine bond cleavage enzymic acetal hemiacetal conversion.

The potential of alkoxyamines as theranostic agents has been recently promoted by authors groups. The success of such an approach relies on the switch upon enzymic triggering between highly stable precursor alkoxyamines and activated alkoxyamines exhibiting fast homolysis of the C-ON bond. Hence, at 37° in water, benzyl 2-(2,2,6,6-tetramethylpiperidin-N-oxy)-3-ethoxy-3-acetoxypropanoate and benzyl 2-ditert-butylaminoxy-3-ethoxy-3-acetoxy propanoate afford tmax of 2000 s (35% conversion) and 500 s (60% conversion), resp., for the C-ON bond homolysis in the presence of Subtilisin A whereas t1/2 of ca. 42 thousand millenniums and 330 years are expected accordingly to Ea values in n-propanol. These results nicely highlight the on/off switch, provided that an enzymic activity controls the C-ON bond homolysis.

Organic Chemistry Frontiers published new progress about Activation energy. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Application of Benzyl acetate.

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

Shirshin, Konstantin K. published the artcileSpecific Organocatalysis in Amidation Reaction of Fatty Acid Methyl Esters with 3-(Dimethylamino)-1-propylamine, Safety of Methyl decanoate, the main research area is dimethylaminopropyl amine FAME organo catalytic amidation potential energy surface.

Comparison of various organic compounds such as glycols, amines and alkanolamines as organocatalysts in amidation of fatty acid Me esters with 3-(dimethylamino)-1-propylamine was made for the first time. It was exptl. detected that catalysts containing OH-groups (alcs., glycols, glycerol and aminoalcs.) influence the reaction rate. Moreover, catalytic effect is depending on the catalysts geometry significantly. 1,5-diols (e. g. diethylene glycol and diethanolamine) were found to accelerate the reaction more than other OH-groups containing additives. It was supposed, that this catalytic effect is caused by specific associative interactions between reactants and 1,5-diols, what was confirmed by quantum mechanics calculations Catalysts concentration effects on the reaction rate were also investigated.

ChemistrySelect published new progress about Activation energy. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Safety of Methyl decanoate.

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

Huang, Rui published the artcilePhysicochemical characterizations of microalgal methyl esters extracted with hexane and refined by vacuum distillation at different temperatures, Recommanded Product: Methyl decanoate, the main research area is hexane microalgal methyl ester vacuum distillation.

To prepare quality biodiesel from microalgal lipids in pilot-scale reactors, Me esters from microalgal cells were extracted with hexane after direct transesterification and then refined by vacuum distillation The refined Me esters were comprehensively characterized via gas chromatog.-mass spectrometry, Fourier transform IR spectroscopy, NMR, and thermogravimetric anal. The Me ester refined at 255°C-259°C was found to be the ideal fuel with a high fatty acid Me ester content of 94.6%, a low combustion activation energy of 42.1 kJ/mol, and a proper carbon-chain length distributed in C14-C18. Impurities extracted with hexane, such as alkanes and short-chain esters, were separated at 105°C-254°C owing to their low polarity and mol. weight Highly unsaturated Me esters with a long carbon-chain were collected at 260°C-280°C owing to their high b.p. Separation of alkanes, short-chain esters, and highly unsaturated Me esters through vacuum distillation effectively improved the properties of the Me esters extracted with hexane as a fuel and enhanced the economic feasibility of microalgal lipids.

Fuel published new progress about Activation energy. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Recommanded Product: Methyl decanoate.

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

Huang, Rui published the artcilePhysicochemical characterizations of microalgal methyl esters extracted with hexane and refined by vacuum distillation at different temperatures, Category: esters-buliding-blocks, the main research area is hexane microalgal methyl ester vacuum distillation.

To prepare quality biodiesel from microalgal lipids in pilot-scale reactors, Me esters from microalgal cells were extracted with hexane after direct transesterification and then refined by vacuum distillation The refined Me esters were comprehensively characterized via gas chromatog.-mass spectrometry, Fourier transform IR spectroscopy, NMR, and thermogravimetric anal. The Me ester refined at 255°C-259°C was found to be the ideal fuel with a high fatty acid Me ester content of 94.6%, a low combustion activation energy of 42.1 kJ/mol, and a proper carbon-chain length distributed in C14-C18. Impurities extracted with hexane, such as alkanes and short-chain esters, were separated at 105°C-254°C owing to their low polarity and mol. weight Highly unsaturated Me esters with a long carbon-chain were collected at 260°C-280°C owing to their high b.p. Separation of alkanes, short-chain esters, and highly unsaturated Me esters through vacuum distillation effectively improved the properties of the Me esters extracted with hexane as a fuel and enhanced the economic feasibility of microalgal lipids.

Fuel published new progress about Activation energy. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Category: esters-buliding-blocks.

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

Atelge, M. R. published the artcileProduction of biodiesel and hydrogen by using a double-function heterogeneous catalyst derived from spent coffee grounds and its thermodynamic analysis, Recommanded Product: Methyl octanoate, the main research area is hydrogen biodiesel production heterogeneous catalyst spent coffee ground thermodn.

Biodiesel and hydrogen are promising liquid and gas energy source alternatives to satisfy fossil fuel demand. In this study, a heterogeneous catalyst, spent coffee grounds derived activated carbon supported, was synthesized using KOH as an activation agent. The highest iodine number was obtained at 600 °C carbonization temperature and the synthesized catalyst was subjected to the characterization and evaluated in terms of biodiesel and hydrogen production efficiencies. The optimal transesterification reaction parameters were determined as 3 wt% catalyst loading, 9:1 methanol-to-waste cooking oil molar ratio, 90 °C reaction temperature, and 120 min reaction time. Under optimal reaction conditions, the biodiesel yield was 91.57%. For hydrogen production, 100% conversion was observed in all cases. Among the exptl. conditions, the fastest reaction was obtained with the addition of 0.25 g superior catalyst with 2.5% of NaBH4 concentration at 30 °C reaction temperature Moreover, the chosen superior catalyst was successfully reused for five cycles to test the reusability of the catalyst. The catalyst performance was almost the same as of the first cycle after regeneration for both transesterification and dehydrogenation reactions. Addnl., the activation energy of the transesterification and methanolysis reactions was calculated as 19.15 and 15.48 kJ/mol, resp. In the thermodn. aspect, both reactions were endergonic and unspontaneous. Addnl., it can be concluded that the reactants were converted to the products very well due to the indication of entropy change.

Renewable Energy published new progress about Activation energy. 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