Category: esters-buliding-blocks

Chen, Zhiyong published the artcileStudy on the formation of ethyl levulinate from wheat straw based on a model compound, COA of Formula: C7H12O3, the main research area is ethyl levulinate wheat straw glucose microcrystalline cellulose.

Glucose and microcrystalline cellulose were selected as model compounds to investigate the formation of Et levulinate (EL). Optimal glucose and microcrystalline cellulose transformation conditions resulted in yields of 41.05 weight% and 38.56 weight% for EL, 0.73 weight% and 2.63 weight% for ethyl-glucoside (EG), 0.42 weight% and 0.36 weight% for 5-hydroxymethylfurfural (HMF), and 2.18 weight% and 2.16 weight% for 5-ethoxy Me furfural (EMF), resp. Increasing the reaction time and temperature resulted in an optimized yield of EL. These increases also resulted in decreased EG and EMF yield, and the change trend of HMF was not significant. EMF, HMF, and EG are intermediates in the formation of EL. Finally, we concluded that biomass conversion occurs first through cellulose degradation to glucose followed by the production of EG through alcoholysis and hydrolysis and dehydration of the reaction products to produce EL.

Journal of Biobased Materials and Bioenergy published new progress about Liquefaction. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, COA of Formula: C7H12O3.

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

Hommes, Arne published the artcileAerobic oxidation of benzyl alcohol in a slug flow microreactor: Influence of liquid film wetting on mass transfer, Quality Control of 140-11-4, the main research area is oxidation benzyl alc slug microreactor film wetting mass transfer.

Homogeneous Co/Mn/Br catalyzed aerobic oxidation of benzyl alc. in acetic acid to benzaldehyde was performed in polytetrafluoroethylene microreactors operated under slug flow at temperatures up to 150° and pressures up to 5 bar. Depending on the bubble velocity and length, a wetted or dewetted slug flow was observed, characterized typically by a complete or partially wetting liquid film around the bubble body. The latter flow suffered from a limited interfacial area for mass transfer. Experiments at temperatures up to ∼90° were under kinetic control given no product yield difference under wetted and dewetted slug flows and were used to establish a simplified kinetic expression (first order in benzyl alc. and zero order in oxygen). This allows to develop a mass transfer model combined with an instantaneous reaction regime that well described the exptl. results at higher temperatures where mass transfer was limiting in the dewetted slug flow.

AIChE Journal published new progress about Liquid films. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Quality Control of 140-11-4.

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

Liu, Xin published the artcileEco-friendly quantum dots for liquid luminescent solar concentrators, Category: esters-buliding-blocks, the main research area is ecofriendly quantum dot liquid luminescent solar concentrator.

Luminescent solar concentrators (LSCs) are a promising solution to reduce the cost of integrated photovoltaic (PV) cells. Colloidal quantum dots (QDs) were excellent candidates as a new type of absorber/emitter in LSCs, due to their size-tunable absorption and emission, high photoluminescence quantum yield (PLQY) and structure-engineered large Stokes shift. However, to date, the majority of QD-based LSCs employ QDs containing heavy-metal (e.g. Cd or Pb) elements, which limits the potential commercialization of LSCs. Herein, we propose the synthesis of green transition metal ion-doped semiconductor QDs such as Cu-doped ZnInSe QDs and their use as luminophores in LSCs. By tailoring the amount of Cu doping, it was possible to tune the photoluminescent (PL) emissions over the whole visible spectral window and simultaneously enlarge the Stokes shift, reaching a PLQY of 63%. Furthermore, a comparative study between polymer and liquid solar concentrators showed that, under optimal conditions, it is possible to obtain a green, heavy metal free liquid QD-based LSC with a high optical efficiency of over 3.5%. This result is more than two times higher than that of a polymer LSC (ηopt = 1.75%, G = 10), which could be ascribed to the reduced reabsorption losses and avoided energy loss by surface and internal defects resulting from polymerization The waveguides for liquid LSCs could be recycled for tuning the concentrations and changing various luminophores which makes the liquid LSCs cost-effective and environmentally friendly. The success of eco-friendly Cu doped Zn-In-Se QDs for liquid LSCs provides a platform of more efficient and environmentally friendly solar energy harvest systems. In addition, the comparative study between liquid and polymer waveguides provides an opportunity to optimize LSC performance.

Journal of Materials Chemistry A: Materials for Energy and Sustainability published new progress about Luminescence. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Category: esters-buliding-blocks.

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

Lu, Xueyan published the artcileComparative metabolomics of two saline-alkali tolerant plants Suaeda glauca and Puccinellia tenuiflora based on GC-MS platform, Quality Control of 111-11-5, the main research area is Suaeda Puccinellia comparative metabolome; Salt-alkali stress; agroforestry; physiological response; primary metabolites.

Suaeda glauca and Puccinellia tenuiflora are two important saline-alkali tolerant plants that can improve the soil properties. For exploring the different tolerance mechanisms between them, GC-MS-based metabolomics was used to comprehensively evaluate the primary metabolites differences, a total of 51 different metabolites were present in different quantities. The identified compounds were mainly 11 sugars, 7 amino acids, 5 alcs. and 18 organic acids; they play an important role in responding to the saline-alkali stress and distinguish between S. glauca and P. tenuiflora. All identified metabolites classes showed similar trend to largely accumulate in P. tenuiflora roots and S. glauca shoots, this reveals that the two plants used different physiol. strategies to cope with saline-alkali stress.

Natural Product Research published new progress about Metabolomics. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Quality Control of 111-11-5.

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

Pinheiro, Maisa P. published the artcileModulation of Lecitase properties via immobilization on differently activated Immobead-350: Stabilization and inversion of enantiospecificity, Recommanded Product: Benzyl acetate, the main research area is Lecitase Ultra immobilization glutaraldehyde epoxide.

Lecitase Ultra (Leci) was immobilized on Immobead-350 (IB-350) activated with epoxy (EPO), amino-divinylsulfone (DVS) or amino-glutaraldehyde (GLU) groups. Leci-GLU had 27% more activity vs. p-nitro-Ph butyrate (p-NPB) than Leci-EPO, after 3 h of immobilization using 100 mg of enzyme/g of support (immobilization yield was 84.1%, expressed activity vs. p-NPB was around 10%), the covalent immobilization was show for Leci-GLU and Leci-DVS. After 10 consecutive cycles of p-NPB hydrolysis, its activity remained unaltered. Leci-GLU was the most stable preparation at 65°C and pH 7 (29 folds more stable than the free enzyme) and in the presence of 30% acetonitrile at 30°C and pH 7 (almost 2 folds more stable than the free enzyme). Very interestingly, the activity vs. Me mandelate and synthesis of benzyl acetate was quite high. Although the other biocatalysts had preference for the S-Me mandelate, Leci-GLU preferred the R-isomer at pHs 5 (VR/VS = 6.6) and 7 (VR/VS = 3.5). In the enzymic synthesis of benzyl acetate, the most active biocatalyst was also Leci-GLU (2.1 U/mg), being almost 2 folds more active than Leci-DVS. According to the results, it was concluded that the Lecitase immobilization on IB-350 using different chemistries greatly influenced its catalytic properties.

Process Biochemistry (Oxford, United Kingdom) published new progress about Optimization. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Recommanded Product: Benzyl acetate.

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

Bezerra, Rayanne M. published the artcileA new heterofunctional support for enzyme immobilization: PEI functionalized Fe3O4 MNPs activated with divinyl sulfone. Application in the immobilization of lipase from Thermomyces lanuginosus, Application In Synthesis of 140-11-4, the main research area is Thermomyces lanuginosus Fe3O4 lipase immobilization; Divinyl sulfone; Immobilization; Lipase from Thermomyces lanuginosus; Multipoint covalent attachment; Superparamagnetic nanoparticles.

Lipase from Thermomyces lanuginosus(TLL) was immobilized onto a novel heterofunctional support, divinyl sulfone (DVS) superparamagnetic nanoparticles (SPMNs) functionalized with polyethyleneimine (PEI). Particle size and zeta potential measurements, elemental anal., X-ray powder diffraction, magnetic measurements, and IR spectroscopy anal. were used to characterize the TLL preparations At pH 10, it was possible to achieve 100% of immobilization yield in 1 h. The immobilization pH gives TLL preparations with different stabilities; indeed the TLL preparation immobilized at pH 5.0 was the most stable during the thermal inactivation at all pH values. For the hydrolysis of racemic Me mandelate, the nanobiocatalysts immobilized at pH 5.0 and blocked with ethylenediamine (EDA) and ethanolamine (ETA) obtained good enantioselectivities (68% and 72%, resp.) with high catalytic activities in the reaction medium at pH 7.0. The operational stability of the systems was evaluated in the esterification reaction of benzyl alc., obtaining up to 61% conversion after the seventh reaction cycle. These results show that SPMN@PEI-DVS support is a robust strategy for the easy and rapid recovery of the nanobiocatalyst by applying a magnetic field, showing great potential for industrial applications.

Enzyme and Microbial Technology published new progress about Optimization. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Application In Synthesis of 140-11-4.

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

Li, Shujing published the artcileUntargeted volatile metabolomics using comprehensive two-dimensional gas chromatography-mass spectrometry – A solution for orange juice authentication, Quality Control of 123-29-5, the main research area is volatile metabolomics orange juice; Comprehensive two-dimensional gas chromatography; Food authentication; Orange juice; Solid phase micro-extraction.

Orange juice is one of the most consumed fruit juices worldwide and its adulteration has been a long-lasting concern. In this study, an untargeted volatile metabolomics using a comprehensive two-dimensional gas chromatog.-quadrupole mass spectrometry (GC x GC-qMS) was developed to systematically authenticate orange juice. At least 405 citrus whole fruits were collected, belongs to 58 types of orange samples and 23 types of non-orange citrus. The fruit juices were prepared in the laboratory and analyzed using the comprehensive GC x GC-qMS instrument. After optimizing the instrumental settings, this novel method was able to identified ∼250 volatiles in each juice sample, covering a variety types of hydrocarbons, esters, alcs., aldehydes, ketones and others. Combining with unsupervised principal component anal. and supervised partial least squares-discriminant anal. , this novel anal. tool was able to authenticate orange juice from a broad perspectives with a high accuracy in the cross-validation model: 1) differentiating orange juice from non-orange citrus juice (99% accuracy), 2) recognizing orange harvesting years (100% accuracy) and geog. origins (96% accuracy), and 3) distinguishing original pure orange juice from the reconstituted juice (94% accuracy). Key volatile metabolites associated with different categories of samples were also identified after thorough investigation of the loading values of the classification models. These metabolites have high potential to be used as food-markers to design targeted anal. methods for orange juice authentication. This novel comprehensive GC x GC-qMS-based method is ideal for governmental laboratories and the food industry to routinely authenticate orange juice.

Talanta published new progress about Orange juice. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Quality Control of 123-29-5.

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

Parish-Virtue, Katie published the artcileThe impact of postharvest ultra-violet light irradiation on the thiol content of Sauvignon blanc grapes, SDS of cas: 106-32-1, the main research area is thiol compound Sauvignon blanc grapes postharvest UV irradiation; 3-Mercapto hexylacetate; 3-Mercaptohexanol; Postharvest; Thiol precursor; Ultra-violet.

Sauvignon blanc grapes were exposed to an ultra-violet (UV) light source post-hand harvest (whole bunches) or post-machine harvest. The thiol precursors S-3-(hexan-1-ol)-L-cysteine (Cys-3MH) and S-3-(hexan-1-ol)-L-glutathione (GSH-3MH) were quantified in the juices before and after UV treatment. Results showed that irradiation of the grapes with UV light had little to no effect on the thiol precursors. Wines were fermented from the corresponding juices and 18 aroma compounds were quantified. Differences were found between UV treatments of the wines for 3-mercaptohexanol, hexan-1-ol, Et butanoate, Et hexanoate, Et octanoate and phenylethyl alc. However, these changes were not significant (p < 0.05) for both grape media trialled. Future studies involving larger sample sizes and replicate numbers should be completed in order to ascertain any changes in aroma chem. as a result of UV light application to grapes postharvest. Food Chemistry published new progress about UV radiation. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, SDS of cas: 106-32-1.

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

Dana, Mutaz published the artcileFlow cytometry measurement of reactive oxygen species generation: some caveats and their solution, HPLC of Formula: 2044-85-1, the main research area is flow cytometry reactive oxygen species red blood cell.

The redox state is very important in normal physiol. and pathol. Yet, its measurement is not practiced within the clinic. The explanation is principally methodol.-the inadequacy of the methods for application in the clin. laboratory Flow cytometry is routinely utilized in hemato-oncol. and immunol. Measuring of the cellular fluorescence by flow cytometry following loading with 2′ 7′-dichlorodihydrofluorescin diacetate (DCFDA) has become a standard exptl. method for quantification of reactive oxygen species (ROS). However, the DCF fluorescence depends on the probe uptake and esterification as well as the presence of intracellular quenchers. Cells of various types, stages of differentiation or senescence, or under different conditions (e.g., pathol. vs. normal) may differ in these respects. A one-time measurement does not take into consideration these differences. Herein, we describe a protocol that overcomes these caveats by determining the change in DCF fluorescence with time as a measure of the rate of ROS generation. Normal (n = 20) and thalassemia (n = 20) red blood cells (RBCs) samples were loaded with DCFDA, washed, and then incubated in a DCFDA-free medium. DCF fluorescence was measured at different times of incubation by flow cytometry and the mean fluorescence (MFC) calculated The results showed that the rate of increase in the DCF fluorescence was linear in both types of RBCs, regardless of their basal level and Hb content, with thalassemia RBCs demonstrating a 4.5-fold higher rate (265/h) compared with normal RBCs (58/h) (p < 0.001). In conclusion, this pulse-chase procedure may be used for flow cytometry clin. evaluation of general and cell type-specific oxidative stress under normal and pathol. conditions. Reactive Oxygen Species published new progress about Acanthocyte. 2044-85-1 belongs to class esters-buliding-blocks, name is 2',7'-Dichloro-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-3',6'-diyl diacetate, and the molecular formula is C24H14Cl2O7, HPLC of Formula: 2044-85-1.

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

Zhang, Lin published the artcileMetatranscriptomic approach reveals the functional and enzyme dynamics of core microbes during noni fruit fermentation, COA of Formula: C11H22O2, the main research area is Morinda metatranscriptomics microbe fruit fermentation; Enzymes; Flavor; Metabolic function; Metatranscriptomic; Morinda citrifolia L.; Noni.

Noni (Morinda citrifolia L.) has been recognized as an important herb for treating various physiol. disorders worldwide. Fermented noni fruit juice, established as a novel food in European Union, is the most important noni product. However, the structure, functions and enzyme profiles of microbiome during fermentation remain unclear. The metatranscriptomic was used to comprehensively explore the active microbial community and key metabolic function. Acetobacter sp., Acetobacter aceti and Gluconobacter sp. were the major microorganisms and appeared in succession during fermentation According to principal components anal. (PCA) of metabolism-related unigenes by KEGG database, the fermentation process was divided into three stages and almost completed at the end of the second stage. Furthermore, carbohydrate-active enzymes (CAZymes) and the expression of key enzymes in major metabolic pathways were analyzed systematically. Anal. by HS-SPME-GC-MS and odor active value (OAV) revealed that butanoic acid and hexanoic acid were the main volatile compounds for the unpleasant odor of fermented noni fruit juice. The microbiome in the fermentation process lacked key enzymes that degrade butanoic acid and hexanoic acid, which imparted rancid and sweat odor. This study provides theor. basis for product improvement and new product development, thus promoting the development of noni food industry.

Food Research International published new progress about Acetobacter. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, COA of Formula: C11H22O2.

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