Category: esters-buliding-blocks

Lu, Yutong published the artcileEnhancement of Removal of VOCs and Odors from Wood by Microwave-Activated Persulfate, Product Details of C6H12O3, the main research area is VOCs odor wood microwave persulfate.

Since traditional methods for removing volatile organic compounds (VOCs) from wood consume large amounts of energy and generate environmental pollution, it is desired to develop a convenient and green treatment method. Oxidation by microwave-activated persulfate (MW-PS) is a promising alternative method that has been used to eliminate VOCs from wood. The penetration of microwave energy can destroy the wood pit membranes and increase VOC emissions. The VOCs are further degraded by ·OH and SO4•-, which are generated via the activation of microwaves. This phenomenon can be detected by the ESR spectrometry. The 35 types of main VOCs of natural wood were determined, including alkanes/terpenes, alcs./ethers, esters, aldehydes/ketones, and others. In the MW-PS system, 23 compounds were removed with an efficiency of 100%. Specifically, as one of the major compounds, the content of alkanes/terpenes was sharply decreased, and no alcs./ethers and esters were detected. It was found that the optimal conditions of the MW-PS system for the min. release of VOCs from wood were the microwave power of 462 W, irradiation time of 30 min, and PS dosage of 0.5 mmol/L.

ACS Omega published new progress about Fir wood. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Product Details of C6H12O3.

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

Erck, Robert A. published the artcileInvestigations of Polymethacrylate Tribochemical Films Using X-Ray Spectroscopy and Optical Profilometry, Recommanded Product: Dodecyl 2-methylacrylate, the main research area is polymethacrylate tribochem film X ray spectroscopy optical profilometry.

This study investigates the elemental composition and surface morphol. of solid tribochem. films formed on steel surfaces. The reversible addition-fragmentation chain transfer (RAFT) method was used to synthesize nine different metal-free polymers, which were blended into com. base oils. The polymers were either homopolymers of dodecyl methacrylate and ethylhexyl methacrylate or were co-polymers of these monomers with six polar monomers. After tribol. testing at 100°C using the ball-on-flat geometry, the resulting tribochem. films were imaged using SEM and optical microscopy. The resulting tribochem. films have thicknesses around 50-100 nm. Two of the films corresponding to small (P1-imidazole-containing copolymer) and large (P3-less polar homopolymer) wear were cross-sectioned using focused ion beam and analyzed for elemental composition using energy-dispersive X-Ray mapping. Oxygen and nitrogen enrichment was observed, consistent with the relative chem. composition of the precursor polymers. Transmission electron microscopy evidence suggests that at the worn surface, some organic elements penetrate or are mixed into the steel substrate giving an interlocking appearance. The two samples examined with TEM showed that P1 tribofilm is diffused or mixed with the steel substrate more so than P3, suggesting a stronger affinity and contact during tribofilm formation.

Tribology Letters published new progress about Friction. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Recommanded Product: Dodecyl 2-methylacrylate.

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

Yamada, Shinji published the artcileConfined film structure and friction properties of triblock copolymer additives in oil-based lubrication, Recommanded Product: Dodecyl 2-methylacrylate, the main research area is polyolefin friction lubricant oil additive.

The friction properties of a dilute solution of block copolymer additives in poly-α-olefin (PAO) confined between mica surfaces were investigated using the surface forces apparatus Friction measurements were made for poly(11-acrylamidoundecanoic acid)-block-poly(alkyl methacrylate)-block-poly(11-acrylamidoundecanoic acid) with an alkyl chain length of C12 (A5L946A5) in the poly(alkyl methacrylate) blocks. The results were compared to those for a PAO solution of a similar triblock copolymer with an alkyl chain length of C18 (A5S992A5) examined in our previous work (Yamada et al., Langmuir 2015). The friction coefficient μ for A5L946A5/PAO was approx. 0.5, which was one or two orders of magnitude larger than that for A5S992A5/PAO (μ of 0.002-0.039). Detailed anal. of the dynamic thickness and contact geometry enabled us to investigate the difference in the friction reduction abilities of the two additives. A5L946A5 has a high affinity to PAO and the mols. have expanded conformation in PAO; extensive chain entanglement effect results in the formation of a thick and viscous lubricant layer, which gives rise to high friction. On the other hand, A5S992A5 has low affinity to PAO, and the shrunken A5S992A5 mols. adsorbed on the surfaces form a rigid slip plane at the interface, which gives rise to low friction. Our results provide insights into the oil/additive combinations used for low friction in oil-based lubrication.

Polymer Journal (Tokyo, Japan) published new progress about Friction. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Recommanded Product: Dodecyl 2-methylacrylate.

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

Christopher, John A. published the artcileDiscovery of HTL6641, a dual orexin receptor antagonist with differentiated pharmacodynamic properties, SDS of cas: 84937-82-6, the main research area is suvorexant HTL6641 neuroprotectant pharmacokinetics insomnia.

A novel series of potent, selective, and orally efficacious dual antagonists of the orexin receptors has been investigated, resulting in the identification of lead compound 27 (HTL6641). Comprehensive data for 27 are presented, including in vivo PK parameters, confirmation of receptor occupancy through ex vivo binding and efficacy in a rat sleep model. A key feature of the series is a short dissociation half-life, measured by surface plasmon resonance (SPR) using stabilized receptors, and confirmed by radioligand-binding experiments Based on a consideration of the requirements for a potential treatment for insomnia, compound 27 was identified as having the best balance of properties from the chem. series.

MedChemComm published new progress about Insomnia. 84937-82-6 belongs to class esters-buliding-blocks, name is Methyl 2,6-difluoro-4-methoxybenzoate, and the molecular formula is C9H8F2O3, SDS of cas: 84937-82-6.

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

Olegario, Lary Souza published the artcileChemical characterization of four Brazilian brown propolis: An insight in tracking of its geographical location of production and quality control, Application of Methyl octanoate, the main research area is chem characterization four brazilian brown propolis geog location production; Brazil; Brown propolis; GC–MS; Geographical origin; SPME; Volatiles.

The aim of this work was to undertake a detailed anal. on chem. constituents of brown propolis, originating from four different states (Bahia, Minas Gerais, Parana ́and Sergipe) of Brazil. The volatile profile was determined by using HS-SPME-GC-MS along with the determination of total phenolic compounds content, flavonoids and antioxidant activity. A total of 315 volatile compounds were identified, however, several of them have not been reported so far in the Brazilian brown propolis. The terpenes represented the major class with 40.92-84.66% of the total area in the chromatograms. PCA anal. of the majority of compounds successfully indicated the volatile profile of each propolis sample according to their geog. origin. The anal. of volatile compounds and its characterization also varied significantly and confirmed that these depended on the geog. area of collection of propolis. The data generated in this work may help in establishing criteria for quality control and tracking the specific region of propolis production in different states of Brazil.

Food Research International published new progress about Propolis. 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

Martins, Zita E. published the artcileA chemometric approach to compare Portuguese native hops with worldwide commercial varieties, Related Products of esters-buliding-blocks, the main research area is hops linalool headspace solid phase microextraction GC mass spectrometry.

A diversity of native hops can be found in Portugal, but little is known concerning their volatile and sensory profiles. Nowadays, the exponential growth of the craft beer sector and the preference for more flavoured beers promote the research of unexplored wild hops that have the advantage of being well adapted to the Portuguese edaphoclimatic conditions. Therefore, the goal of this study was to characterize the volatile profile of 75 native Portuguese hops and compare with 34 com. varieties by means of headspace solid-phase microextraction gas chromatog./mass spectrometry (HS-SPME-GC/MS), in order to select those that present similarities with commercialized hops and confirm by check-all-that-apply (CATA) anal. if they present similar organoleptic characteristics. Due to the complexity of hop volatile profile and the great number of samples analyzed, robust chemometric treatment of chromatog. and sensorial data was required to make reliable conclusions. Twelve Portuguese hops present a volatile profile and sensory characteristics quite similar to some com. varieties, because 11 Portuguese hops were grouped with the European varieties Challenger, Hallertauer Magnum and Perle, both in volatile profile and sensory anal. and one clustered with American registered varieties.

Journal of Chemometrics published new progress about Taxonomy. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Related Products of esters-buliding-blocks.

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

Martins, Zita E. published the artcileA chemometric approach to compare Portuguese native hops with worldwide commercial varieties, Category: esters-buliding-blocks, the main research area is hops linalool headspace solid phase microextraction GC mass spectrometry.

A diversity of native hops can be found in Portugal, but little is known concerning their volatile and sensory profiles. Nowadays, the exponential growth of the craft beer sector and the preference for more flavoured beers promote the research of unexplored wild hops that have the advantage of being well adapted to the Portuguese edaphoclimatic conditions. Therefore, the goal of this study was to characterize the volatile profile of 75 native Portuguese hops and compare with 34 com. varieties by means of headspace solid-phase microextraction gas chromatog./mass spectrometry (HS-SPME-GC/MS), in order to select those that present similarities with commercialized hops and confirm by check-all-that-apply (CATA) anal. if they present similar organoleptic characteristics. Due to the complexity of hop volatile profile and the great number of samples analyzed, robust chemometric treatment of chromatog. and sensorial data was required to make reliable conclusions. Twelve Portuguese hops present a volatile profile and sensory characteristics quite similar to some com. varieties, because 11 Portuguese hops were grouped with the European varieties Challenger, Hallertauer Magnum and Perle, both in volatile profile and sensory anal. and one clustered with American registered varieties.

Journal of Chemometrics published new progress about Taxonomy. 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

Roshan, Niloufar published the artcileTwo-day enema antibiotic therapy for parasite eradication and resolution of symptoms, Safety of 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate, the main research area is antibiotic enema Blastocystis Dientamoeba infection; Antibiotics; Blastocystis hominis; Dientamoeba fragilis; Parasitic infection; Rectal enema route; Triple therapy.

Blastocystis hominis (B. hominis) and Dientamoeba fragilis (D. fragilis) are two protozoan parasites of human bowel that are found throughout the world. There is still debate about the pathogenicity of these protozoans, despite them being commonly associated with gastrointestinal symptoms and can cause health issue in both children and adults. These parasites are usually transmitted through faecal-oral contact particularly under poor hygiene conditions or food/water contamination. Once a person is infected, the parasites live in the large intestine and are passed in the faeces. To investigate the effect of triple antibiotic therapy using enema infusion in the treatment of B. hominis and D. fragilis infections. This retrospective longitudinal study was conducted in a single medical center, which included fifty-four patients (> 18 years) who were pos. for D. fragilis, B. hominis or both between 2017 and 2018. The treatment consisted of triple antibiotics that were infused over two consecutive days through rectal enema. Faecal samples were collected from participants pre- and post-treatment and were tested for parasites using microscopy and polymerase chain reaction. Patients’ symptoms were recorded prior and after the treatment as well as patient demog. data. Patients (n = 54), were either pos. for B. hominis (37%), D. fragilis (35%) or both (28%). All patients completed the two-day treatment and no serious adverse effect was reported. The most common side effect experienced by the patients during the treatment was urine discoloration which was cleared by six weeks of follow-up. Common symptoms reported prior to treatment were diarrhoea, abdominal pain, constipation and fatigue. Other symptoms included abdominal discomfort, dizziness and blood in the stool. Eighty-nine percent of patients completed a final stool test post-treatment. At six weeks post-treatment, 79% of patients cleared the parasites from their faeces. Symptoms such as abdominal discomfort, dizziness and blood in the stool decreased significantly at both seven days and six weeks post-treatment (P < 0.040). The enema retention time, bowel preparation, previous antibiotic treatment or previous gastrointestinal problems had no significant effect on parasite eradication. Overall, eradication of parasites and improvement of clin. outcomes were observed in treated patients, showing the efficacy of this combination to eradicate the parasites and provide pos. clin. outcome. World Journal of Gastroenterology published new progress about Abdomen. 55981-09-4 belongs to class esters-buliding-blocks, name is 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate, and the molecular formula is C12H9N3O5S, Safety of 2-((5-Nitrothiazol-2-yl)carbamoyl)phenyl acetate.

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

Cincotta, Fabrizio published the artcileInfluence of leaf removal on grape, wine and aroma compounds of Vitis vinifera L. cv. Merlot under Mediterranean climate, Application In Synthesis of 110-42-9, the main research area is Vitis vinifera aroma compound wine grape leaf removal climate.

Merlot is one of the most cultivated cultivars in the world since it easily adapts to different climatic conditions. Leaf removal (LR) is commonly used for red berry varieties but in cold wine-growing areas and nothing has been reported on the effects of LR on Merlot cultivated under Mediterranean climate. The aim of the research is to evaluate the influence of this technique on grape and wine quality as well as wine aroma potential of Merlot cultivated in Sicily. Vines were subjected to LR for two consecutive years, and productivity and chem. parameters were monitored in grapes, whereas chem. composition and volatile aroma compounds, analyzed by gas chromatog. mass spectrometry, were monitored in wines. LR pos. influenced the plant yield, increased the sugar content and decreased the acidity in grapes at harvest. The wines of the defoliated treatment showed a higher content of total polyphenols and anthocyanins, higher color intensity, and lower color hue. Merlot wines obtained under Mediterranean climate were characterized by a high amount of esters and varietal aromas and the content of most of volatiles were even increased by the LR with pos. effects on the aroma potential of Merlot wines. The vintage affected almost all the studied parameters with the warmer and dryer vintage enhancing the LR effects on grapes and wines. This is of great interest in the light of the climate changes towards the global warming and the increasing aridity of the Mediterranean area.

European Food Research and Technology published new progress about Acidity. 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

Cincotta, Fabrizio published the artcileInfluence of leaf removal on grape, wine and aroma compounds of Vitis vinifera L. cv. Merlot under Mediterranean climate, SDS of cas: 123-29-5, the main research area is Vitis vinifera aroma compound wine grape leaf removal climate.

Merlot is one of the most cultivated cultivars in the world since it easily adapts to different climatic conditions. Leaf removal (LR) is commonly used for red berry varieties but in cold wine-growing areas and nothing has been reported on the effects of LR on Merlot cultivated under Mediterranean climate. The aim of the research is to evaluate the influence of this technique on grape and wine quality as well as wine aroma potential of Merlot cultivated in Sicily. Vines were subjected to LR for two consecutive years, and productivity and chem. parameters were monitored in grapes, whereas chem. composition and volatile aroma compounds, analyzed by gas chromatog. mass spectrometry, were monitored in wines. LR pos. influenced the plant yield, increased the sugar content and decreased the acidity in grapes at harvest. The wines of the defoliated treatment showed a higher content of total polyphenols and anthocyanins, higher color intensity, and lower color hue. Merlot wines obtained under Mediterranean climate were characterized by a high amount of esters and varietal aromas and the content of most of volatiles were even increased by the LR with pos. effects on the aroma potential of Merlot wines. The vintage affected almost all the studied parameters with the warmer and dryer vintage enhancing the LR effects on grapes and wines. This is of great interest in the light of the climate changes towards the global warming and the increasing aridity of the Mediterranean area.

European Food Research and Technology published new progress about Acidity. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, SDS of cas: 123-29-5.

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