Month: December 2022

Lee, Minhan published the artcileModular Tuning of Electrophilic Reactivity of Iridium Nitrenoids for the Intermolecular Selective α-Amidation of β-Keto Esters, Category: esters-buliding-blocks, the main research area is dicarbonyl compound trichloroethoxycarbonyl azide iridium catalyst chemoselective amidation; amido dicarbonyl compound preparation.

Ir-catalyzed intermol. amino group transfer to β-keto esters (amides) to α-aminocarbonyl products with excellent chemoselectivity was reported. The key strategy was engineered electrophilicity of the putative Ir-nitrenoids by tuning electronic property of the κ2-N,O chelating ligands, thus facilitated nucleophilic addition of enol π-bonds of 1,3-dicarbonyl substrates.

Journal of the American Chemical Society published new progress about Amidation (chemoselective). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Category: esters-buliding-blocks.

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

Kozawa, Susan K. published the artcileSelf-assembly of amphiphilic ABA random triblock copolymers in water, COA of Formula: C16H30O2, the main research area is self amphiphilic aba random triblock copolymer water.

Self-assembly of amphiphilic ABA random triblock copolymers in water serves as a novel approach to create unique structure micelles connected with flexible linkages. The ABA triblock copolymers consist of amphiphilic random copolymers bearing hydrophilic poly(ethylene glycol) and hydrophobic dodecyl pendants as the A segments and a hydrophilic poly(ethylene oxide) (PEO) as the middle B segment. The A block is varied in dodecyl methacrylate content of 20%-50% and d.p. (DP) of 100-200. By controlling the composition and DP of the A block, various architectures can be tailor-made as micelles in water: PEO-linked double core unimer micelles, PEO-looped unimer or dimer micelles, and multichain micelles. Those PEO-linked or looped micelles further exhibit thermoresponsive solubility in water. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018.

Journal of Polymer Science, Part A: Polymer Chemistry published new progress about Amphiphiles. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, COA of Formula: C16H30O2.

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

Diez-Fernandez, Alazne published the artcileMosquitoes are attracted by the odour of Plasmodium-infected birds, Product Details of C17H34O2, the main research area is Plasmodium Passer Culex odor; Chemical communication; Host preference; Infectious diseases; Olfaction; Olfactometer; Wild birds.

Avian malaria parasites (Plasmodium) are thought to alter the cues such as host odor, used by host-seeking mosquitoes. Bird odor is affected by secretions from the uropygial gland and may play a role in modulating vector-host interactions. We tested the hypothesis that mosquitoes are more attracted to the uropygial secretions and/or whole-body odor (headspace) of Plasmodium-infected house sparrows (Passer domesticus) than to those of uninfected birds. We tested the attraction of nulliparous (e.g. uninfected mosquitoes without previous access to blood) Culex pipiens females towards these stimuli in a dual-choice olfactometer. We used Gas Chromatog.-Mass Spectrometry (GC-MS) analyses to assess whether Plasmodium infection is associated with differences in the chem. composition of uropygial secretions. Mosquitoes were more attracted to the odours of infected than uninfected birds, regardless of sex. However, the significant interaction between infection status and the stimuli (uropygial secretion or headspace) showed that mosquitoes were more attracted to the headspace of infected birds; no differences were found in the case of uropygial secretions. The compounds in the volatile lipophilic fraction of the uropygial secretion did not differ between infected and uninfected birds. These results support the host manipulation hypothesis since avian Plasmodium parasites may be capable of altering their hosts body odor, thereby making infected individuals more attractive to mosquitoes.

International Journal for Parasitology published new progress about Alcohols Role: ANT (Analyte), BSU (Biological Study, Unclassified), ANST (Analytical Study), BIOL (Biological Study). 41114-00-5 belongs to class esters-buliding-blocks, name is Ethyl pentadecanoate, and the molecular formula is C17H34O2, Product Details of C17H34O2.

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

Song, Young-Ran published the artcileEvaluation of Probiotic Properties of Pediococcus acidilactici M76 Producing Functional Exopolysaccharides and Its Lactic Acid Fermentation of Black Raspberry Extract, Quality Control of 123-29-5, the main research area is Pediococcus probiotics exopolysaccharide black raspberry lactic acid; Pediococcus acidilactici; antioxidant; black raspberry; exopolysaccharide; flavors; lactic acid fermentation.

This study aimed to determine the probiotic potential of Pediococcus acidilactici M76 (PA-M76) for lactic acid fermentation of black raspberry extract (BRE). PA-M76 showed outstanding probiotic properties with high tolerance in acidic GIT environments, broad antimicrobial activity, and high adhesion capability in the intestinal tract of Caenorhabditis elegans. PA-M76 treatment resulted in significant increases of pro-inflammatory cytokine mRNA expression in macrophages, indicating that PA-M76 elicits an effective immune response. When PA-M76 was used for lactic acid fermentation of BRE, an EPS yield of 1.62 g/L was obtained under optimal conditions. Lactic acid fermentation of BRE by PA-M76 did not significantly affect the total anthocyanin and flavonoid content, except for a significant increase in total polyphenol content compared to non-fermented BRE (NfBRE). However, fBRE exhibited increased DPPH radical scavenging activity, linoleic acid peroxidation inhibition rate, and ABTS scavenging activity of fBRE compared to NfBRE. Among the 28 compounds identified in the GC-MS anal., esters were present as the major groups. The total concentration of volatile compounds was higher in fBRE than that in NfBRE. However, the undesirable flavor of terpenes decreased. PA-M76 might be useful for preparing functionally enhanced fermented beverages with a higher antioxidant activity of EPS and enhanced flavors.

Microorganisms published new progress about Antimicrobial agents. 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

Ubeda, Cristina published the artcileStudy of the changes in volatile compounds, aroma and sensory attributes during the production process of sparkling wine by traditional method, Recommanded Product: Methyl decanoate, the main research area is sparkling wine aroma sensory property volatile compound; Aging; Impact aroma compounds; Olfactometry; País grape variety; Sensory analysis; Volatile compounds; sparkling wine.

One of the strongest factors that affects the volatile profile of sparkling wine is the winemaking process. Here we focus on determining the effects of the second fermentation and aging on lees of sparkling wine from Pais grape variety combining different anal. techniques for the first time in sparkling wine: gas chromatog./mass spectrometry/olfactometry and sensorial anal. During the second fermentation and aging, there was a significant loss of esters that might be related to the adsorption on lees and ester volatility and chem. hydrolysis. The concentration of several compounds such as some esters (di-Et succinate, Et lactate, and Et isovalerate) increased during aging and could be used as aging markers. Vitispiranes were identified as the best norisoprenoids aging markers for young sparkling wines (12 mo of aging). Also, PCA showed that time of aging on lees affected mostly esters and terpenes. On the other hand, the diminution of fruity/floral impact odorants during aging was not perceived in sensorial trials. Our results suggest that the responsibility for fruity/floral nuances in sparkling wine might reside in a few high-impact aromatic compounds, such as Et isobutyrate, isoamyl acetate, Et hexanoate, β-phenylethanol and di-Et succinate.

Food Research International published new progress about Aging of materials. 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

Ubeda, Cristina published the artcileStudy of the changes in volatile compounds, aroma and sensory attributes during the production process of sparkling wine by traditional method, Related Products of esters-buliding-blocks, the main research area is sparkling wine aroma sensory property volatile compound; Aging; Impact aroma compounds; Olfactometry; País grape variety; Sensory analysis; Volatile compounds; sparkling wine.

One of the strongest factors that affects the volatile profile of sparkling wine is the winemaking process. Here we focus on determining the effects of the second fermentation and aging on lees of sparkling wine from Pais grape variety combining different anal. techniques for the first time in sparkling wine: gas chromatog./mass spectrometry/olfactometry and sensorial anal. During the second fermentation and aging, there was a significant loss of esters that might be related to the adsorption on lees and ester volatility and chem. hydrolysis. The concentration of several compounds such as some esters (di-Et succinate, Et lactate, and Et isovalerate) increased during aging and could be used as aging markers. Vitispiranes were identified as the best norisoprenoids aging markers for young sparkling wines (12 mo of aging). Also, PCA showed that time of aging on lees affected mostly esters and terpenes. On the other hand, the diminution of fruity/floral impact odorants during aging was not perceived in sensorial trials. Our results suggest that the responsibility for fruity/floral nuances in sparkling wine might reside in a few high-impact aromatic compounds, such as Et isobutyrate, isoamyl acetate, Et hexanoate, β-phenylethanol and di-Et succinate.

Food Research International published new progress about Aging of materials. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Related Products of esters-buliding-blocks.

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

Ubeda, Cristina published the artcileStudy of the changes in volatile compounds, aroma and sensory attributes during the production process of sparkling wine by traditional method, HPLC of Formula: 111-11-5, the main research area is sparkling wine aroma sensory property volatile compound; Aging; Impact aroma compounds; Olfactometry; País grape variety; Sensory analysis; Volatile compounds; sparkling wine.

One of the strongest factors that affects the volatile profile of sparkling wine is the winemaking process. Here we focus on determining the effects of the second fermentation and aging on lees of sparkling wine from Pais grape variety combining different anal. techniques for the first time in sparkling wine: gas chromatog./mass spectrometry/olfactometry and sensorial anal. During the second fermentation and aging, there was a significant loss of esters that might be related to the adsorption on lees and ester volatility and chem. hydrolysis. The concentration of several compounds such as some esters (di-Et succinate, Et lactate, and Et isovalerate) increased during aging and could be used as aging markers. Vitispiranes were identified as the best norisoprenoids aging markers for young sparkling wines (12 mo of aging). Also, PCA showed that time of aging on lees affected mostly esters and terpenes. On the other hand, the diminution of fruity/floral impact odorants during aging was not perceived in sensorial trials. Our results suggest that the responsibility for fruity/floral nuances in sparkling wine might reside in a few high-impact aromatic compounds, such as Et isobutyrate, isoamyl acetate, Et hexanoate, β-phenylethanol and di-Et succinate.

Food Research International published new progress about Aging of materials. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, HPLC of Formula: 111-11-5.

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

Ubeda, Cristina published the artcileStudy of the changes in volatile compounds, aroma and sensory attributes during the production process of sparkling wine by traditional method, Recommanded Product: Ethyl octanoate, the main research area is sparkling wine aroma sensory property volatile compound; Aging; Impact aroma compounds; Olfactometry; País grape variety; Sensory analysis; Volatile compounds; sparkling wine.

One of the strongest factors that affects the volatile profile of sparkling wine is the winemaking process. Here we focus on determining the effects of the second fermentation and aging on lees of sparkling wine from Pais grape variety combining different anal. techniques for the first time in sparkling wine: gas chromatog./mass spectrometry/olfactometry and sensorial anal. During the second fermentation and aging, there was a significant loss of esters that might be related to the adsorption on lees and ester volatility and chem. hydrolysis. The concentration of several compounds such as some esters (di-Et succinate, Et lactate, and Et isovalerate) increased during aging and could be used as aging markers. Vitispiranes were identified as the best norisoprenoids aging markers for young sparkling wines (12 mo of aging). Also, PCA showed that time of aging on lees affected mostly esters and terpenes. On the other hand, the diminution of fruity/floral impact odorants during aging was not perceived in sensorial trials. Our results suggest that the responsibility for fruity/floral nuances in sparkling wine might reside in a few high-impact aromatic compounds, such as Et isobutyrate, isoamyl acetate, Et hexanoate, β-phenylethanol and di-Et succinate.

Food Research International published new progress about Aging of materials. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Recommanded Product: Ethyl octanoate.

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

Myasoedova, Yu. V. published the artcileTransformations of Peroxide Products of Non-1-ene Ozonolysis by the Action of Carboxylic Acid Hydrazides, Quality Control of 111-11-5, the main research area is peroxide nonene carboxylic acid hydrazide ozonolysis.

The behavior of aliphatic (cyclohexanecarboxylic) and aromatic (salicylic and isonicotinic) carboxylic acid hydrazides toward peroxide products of ozonolysis of a terminal alkene, non-1-ene, in protic (methanol) and aprotic solvents (THF, methylene chloride) has been studied. These hydrazides are capable of acting as reducing agents or decomposing intermediate peroxides. For the synthesis of N’-octylidene isoniazid derivative, it is advisable to carry out the reaction in methanol, whereas the use of THF as solvent favors formation of N’-octylidenecyclohexane-1-carbonydrazide. Salicylic acid hydrazide showed a low efficiency; in this case, mixtures of the corresponding hydrazone with octanoic acid or its Me ester were formed in a low yield.

Russian Journal of Organic Chemistry published new progress about Hydrazides Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 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

Chacon-Parra, Andres published the artcileA multi-component reaction kinetics model for the hydrothermal liquefaction of carbohydrates and co-liquefaction to produce 5-ethoxymethyl furfural, HPLC of Formula: 539-88-8, the main research area is ethoxymethyl furfural cellulose fructose glucose hydrothermal liquefaction carbohydrate decomposition.

Hydrothermal liquefaction (HTL) as a waste management technol. has been investigated to produce renewable bio-crude and other valuable products from wet biomass and bio-waste. However, carbohydrates as a vital component in biomass have shown to increase the complexity of the process. Undesirable solid yields produced by the carbonisation/re-condensation of reactive carbohydrate intermediates could limit the renewable crude yield and recovery. In the present study, the reaction mechanism and kinetic models for the HTL of monosaccharides and polysaccharides are investigated using gas chromatog.-mass spectrometry (GC-MS) and high-performance liquid chromatog. (HPLC) to characterize, validate and quantify the most abundant organic species in the aqueous phase. The exptl. data and models presented provide an unbiased understanding of the carbohydrate decomposition during HTL conversion, while the anal. of solid products clarifies solid transformations and integrates both phases into a more comprehensive reaction mechanism approach, including a shrinking core model for cellulose. Finally, ethanol and acetic acid were added as co-solvents to elucidate the effects of a fully renewable hydrogen donor solvent system to generate 5-ethoxymethyl furfural and Et levulinate (validated with GC-MS), two renewable fuel additives and promising tunable monomers candidates. Experiments were conducted with glucose, fructose, and cellulose in a batch reactor with 20% by mass premixed feedstock at 250°C and 300°C.

Fuel published new progress about Decomposition. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, HPLC of Formula: 539-88-8.

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