Month: December 2022

Deng, Billy published the artcileNeopentyl Esters as Robust Linkers for Introducing Functionality to Bis-MPA Dendrimers, Quality Control of 86549-27-1, the main research area is neopentyl ester linker functionality bisMPA dendrimer.

A series of neopentyl carboxylic acids bearing functionality amenable to click chem. were prepared and then appended to high-generation bis-MPA dendrons via fluoride-promoted esterification. The nucleophilic stability of neopentyl and non-neopentyl dendrons in acidic to basic phosphate buffers was compared by monitoring degradation via quant. 1H NMR. The neopentyl periphery dendrons were found to be highly resistant to hydrolysis under all exptl. conditions. The neopentyl groups also did not impede click functionalization onto the dendrons.

Macromolecules (Washington, DC, United States) published new progress about Dendrimers Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 86549-27-1 belongs to class esters-buliding-blocks, name is Ethyl 2,2-dimethylpent-4-enoate, and the molecular formula is C9H16O2, Quality Control of 86549-27-1.

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

He, Yingxia published the artcileUnraveling the chemosensory characteristics of strong-aroma type Baijiu from different regions using comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry and descriptive sensory analysis, HPLC of Formula: 539-88-8, the main research area is chemosensory gas chromatog mass spectrometry; 1-Butanol (PubChem CID: 263); 2,3,5-Trimethyl-6-ethylpyrazine (PubChem CID: 28518); 2,6-Dimethylpyrazine (PubChem CID: 7938); 2-Acetylfuran (PubChem CID: 14505); Chemical and sensory profiles; Chinese strong-aroma type Baijiu; Diethyl succinate (PubChem CID: 31249); Dimethyl disulfide (PubChem CID: 12232); Furfural (PubChem CID: 7362); GC × GC-TOFMS; Methanethiol caproate (PubChem CID: 75515); Multivariate analysis; Regionality.

Comprehensive 2D gas chromatog.-time-of-flight mass spectrometry was combined with descriptive sensory anal. to elucidate the specificity of strong-aroma type Baijiu (Chinese liquor) from different regions, based on regionally distinct flavor characterized by chem. and sensory profiles. Numerous potential aroma compounds (262) were identified, among which 58 aroma compounds were significantly different between the samples from Sichuan and Jianghuai regions. Relationships between these potential aroma compounds and sensory attributes were investigated by partial least squares regression and network anal. The compounds that dominantly contributed to the important sensory attributes were identified. The high pyrazines, furanoids, and carbonyls amounts contributed to the high intensities of the cellar, toasted, and grain aroma profiles of the Sichuan region samples, while the high ester and alc. levels contributed to the fruity and floral aroma profiles of the Jianghuai region samples. This approach may have practical application in flavor characterization of other alc. beverages.

Food Chemistry published new progress about Chemoreceptors Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 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

He, Yingxia published the artcileUnraveling the chemosensory characteristics of strong-aroma type Baijiu from different regions using comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry and descriptive sensory analysis, COA of Formula: C9H10O2, the main research area is chemosensory gas chromatog mass spectrometry; 1-Butanol (PubChem CID: 263); 2,3,5-Trimethyl-6-ethylpyrazine (PubChem CID: 28518); 2,6-Dimethylpyrazine (PubChem CID: 7938); 2-Acetylfuran (PubChem CID: 14505); Chemical and sensory profiles; Chinese strong-aroma type Baijiu; Diethyl succinate (PubChem CID: 31249); Dimethyl disulfide (PubChem CID: 12232); Furfural (PubChem CID: 7362); GC × GC-TOFMS; Methanethiol caproate (PubChem CID: 75515); Multivariate analysis; Regionality.

Comprehensive 2D gas chromatog.-time-of-flight mass spectrometry was combined with descriptive sensory anal. to elucidate the specificity of strong-aroma type Baijiu (Chinese liquor) from different regions, based on regionally distinct flavor characterized by chem. and sensory profiles. Numerous potential aroma compounds (262) were identified, among which 58 aroma compounds were significantly different between the samples from Sichuan and Jianghuai regions. Relationships between these potential aroma compounds and sensory attributes were investigated by partial least squares regression and network anal. The compounds that dominantly contributed to the important sensory attributes were identified. The high pyrazines, furanoids, and carbonyls amounts contributed to the high intensities of the cellar, toasted, and grain aroma profiles of the Sichuan region samples, while the high ester and alc. levels contributed to the fruity and floral aroma profiles of the Jianghuai region samples. This approach may have practical application in flavor characterization of other alc. beverages.

Food Chemistry published new progress about Chemoreceptors Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, COA of Formula: C9H10O2.

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

Gundekari, Sreedhar published the artcileChemo- and Regioselective Synthesis of Arylated γ-Valerolactones from Bio-based Levulinic Acid with Aromatics Using H-β Zeolite Catalyst, Related Products of esters-buliding-blocks, the main research area is regioselective valerolactone levulinic zeolite catalyst biomass renewable.

Catalytic coupling of biomass-based mols. to value-added chem. intermediates is an interesting area in biomass research. Arylated γ-valerolactones (Agvls), promising pharmaceutical intermediates that have significant biol. activity, are primarily synthesized currently through petro-route. In this paper, we report successful biomass-based synthesis of Agvls using levulinic acid (LA) and oxygen or sulfur- substituted aromatics over H-β zeolite as catalyst under solvent-free conditions. Under optimized condition, LA and anisole render 90 % conversion of former with 82 % yield of para-substituted γ-lactone. C-C bond formation followed by intra-mol. esterification is witnessed in the course of the reaction, which is highly chemo- and regioselective. Though catalyst deactivated while reuse due to deposition of organic carbon moieties as deduced from several physicochem. techniques, it could be regenerated by simple calcination.

ChemCatChem published new progress about Beta zeolites Role: CAT (Catalyst Use), USES (Uses) (sodium-exchanged, calcinated). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Related Products of esters-buliding-blocks.

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

Pradhan, Tapas R. published the artcileSilaborative Assembly of Allenamides and Alkynes: Highly Regio- and Stereocontrolled Access to Bi- or Trimetallic Skipped Dienes, Synthetic Route of 583-04-0, the main research area is allenyl sulfonamide alkyne three component assembly preparation skipped diene; dienyl sulfonamide preparation coupling silylboration allenylamide alkyne silylboronate; Allenamides; Multicomponent Reactions; Silaboration; Skipped Dienes; Stereocontrol.

A highly stereo- and regiocontrolled multicomponent approach to skipped 1,4-dienes decorated with one boryl and two silyl functionalities, XNR1CH:C(Bpin)CH2CR2:CHSiMe2Ph (X = sulfonyl, acyl; R1 = benzyl, alkyl; R2 = silyl, aryl, alkyl, carboxy) is described, comprising three-component reaction of allenamides XNR1CH:C:CH2 with alkynes R2CCH and silylborane Me2PhSiBpin, catalyzed by Pd2(dba)3. This Pd-catalyzed atom-economical union of allenamides, alkynes, and Me2PhSiBpin (or Et3SiBpin) proceeds without the use of phosphine ligands, instead relying on chelation through the internal amide group of the allenamide sulfonyl. A variety of alkynes, including those derived from complex bioactive mols., can be efficiently coupled with allenamides and Me2PhSiBpin in good yields and with excellent selectivity. The synthetic potential was demonstrated through multiple valuable chemoselective transformations, establishing new disconnections for functionalized dienes. D. functional theory calculations revealed that the reaction first proceeded through borylation of the allenamide, followed by silylation of the alkyne and then reductive elimination, which convergently assemble the skipped 1,4-diene.

Angewandte Chemie, International Edition published new progress about Alkadienes Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 583-04-0 belongs to class esters-buliding-blocks, name is Allyl benzoate, and the molecular formula is C10H10O2, Synthetic Route of 583-04-0.

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

Tejero, Paula published the artcileIn Vitro Biological Control of Aspergillus flavus by Hanseniaspora opuntiae L479 and Hanseniaspora uvarum L793, Producers of Antifungal Volatile Organic Compounds, Category: esters-buliding-blocks, the main research area is Hanseniaspora antifungal volatile organic compound antagonism mycotoxin Aspergillus; aflatoxin production; antagonism; antifungal volatile esters; relative gene expression.

Aspergillus flavus is a toxigenic fungal colonizer of fruits and cereals and may produce one of the most important mycotoxins from a food safety perspective, aflatoxins. Therefore, its growth and mycotoxin production should be effectively avoided to protect consumers’ health. Among the safe and green antifungal strategies that can be applied in the field, biocontrol is a recent and emerging strategy that needs to be explored. Yeasts are normally good biocontrol candidates to minimize mold-related hazards and their modes of action are numerous, one of them being the production of volatile organic compounds (VOCs). To this end, the influence of VOCs produced by Hanseniaspora opuntiae L479 and Hanseniaspora uvarum L793 on growth, expression of the regulatory gene of the aflatoxin pathway (aflR) and mycotoxin production by A.flavus for 21 days was assessed. The results showed that both yeasts, despite producing different kinds of VOCs, had a similar effect on inhibiting growth, mycotoxin biosynthetic gene expression and phenotypic toxin production overall at the mid-incubation period when their synthesis was the greatest. Based on the results, both yeast strains, H. opuntiae L479 and H. uvarum L793, are potentially suitable as a biopreservative agents for inhibiting the growth of A. flavus and reducing aflatoxin accumulation.

Toxins published new progress about Aflatoxins Role: ADV (Adverse Effect, Including Toxicity), BIOL (Biological Study). 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

Kong, Cai-Lin published the artcileFine tuning of medium chain fatty acids levels increases fruity ester production during alcoholic fermentation, Formula: C10H20O2, the main research area is fatty acid fruity ester production alc fermentation; Acyl-CoA: alcohol O-acyltransferases; Alcohol O-acyltransferases; Decanoic acid (PubChem CID:2969); Esterase; Ethyl acetate (PubChem CID: 8857); Ethyl decanoate (PubChem CID: 8048); Ethyl hexanoate (PubChem CID: 31265); Ethyl octanoate (PubChem CID: 7799); Hexanoic acid (PubChem CID: 8892); Higher alcohols; Isoamyl acetate (PubChem CID: 31276); Isoamyl alcohol (PubChem CID: 31260); Isobutyl alcohol (PubChem CID: 6560); Non-Saccharomyces; Octanoic acid (PubChem CID: 379); Saccharomyces cerevisiae; Wine aroma.

Pichia fermentans Z9Y-3 and its intracellular enzymes were inoculated along with S. cerevisiae in synthetic grape must to modulate fruity ester production The levels of ester-related enzymes, ester precursors, and fruity esters were monitored every 24 h during fermentation Results showed that the levels of Et acetate, acetate higher alc. esters (AHEs), short chain fatty acid Et esters (SFEs), and medium chain fatty acid Et esters (MFEs) were significantly enhanced in mixed fermentation Pearson correlation anal. further revealed that higher alcs. and fatty acids played a more important role in fruity ester production than enzymes; Particularly, the correlation coefficient between fatty acids and MFEs was 0.940. In addition, supplementation of medium chain fatty acids (7.2 mg/L) at the metaphase of single S. cerevisiae fermentation improved Et acetate, AHE, SFE, and MFE production by 42.56%, 21.00%, 61.33%, and 90.04%, resp., although the high level of Et acetate might result in off-flavors.

Food Chemistry published new progress about Esters Role: BSU (Biological Study, Unclassified), BIOL (Biological Study) (fruity). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Formula: C10H20O2.

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

Xiao, Zuobing published the artcileOlfactory impact of esters on rose essential oil floral alcohol aroma expression in model solution, Computed Properties of 106-32-1, the main research area is Rosa essential oil floral alc aroma olfactory threshold; Adding effect; Aro matic reconstitution; Perceptive interaction; Rose essential oil.

This study focused on the impact of esters on the perception of floral aroma in rose essential oil. Various aromatic reconstitutions were prepared, consisting of 10 alcs. and 9 esters, all the concentrations found in rose essential oil. Sensory anal. by the triangular tests revealed the interesting behavior of certain compounds among the 9 esters following their addition or omission. The results tend to highlight the important role of Et octanoate, Et tetradecanoate, citronellyl acetate, geranyl acetate, and 2-phenethyl acetate of esters in rose essential oil. The “”olfactory threshold”” (OT) of the 5 esters, the floral reconstitution and the mixtures of ester and floral reconstitution were evaluated in alkanes solution Through the Feller’s additive model anal., it was found that the presence of Et octanoate, Et tetradecanoate, and citronellyl acetate led to a significant in decrease the OT of the mixtures, whereas geranyl acetate raised the OT. The floral reconstitution in alkanes solution was supplemented with the 5 esters at high, medium, and low concentration, then analyzed by quant. descriptive anal. It was revealed that Et octanoate, Et tetradecanoate, and citronellyl acetate adding overall aroma, and geranyl acetate masking the overall aroma perception in a model floral mixture Sensory profiles highlighted changes in the perception of aroma nuances in the presence of the 5 esters, with specific perceptive interactions, and reported on the graph based on two parameters [σ = f(τ)]. This paper provided a reference for the flavourists.

Food Research International published new progress about Damask rose oil Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Computed Properties of 106-32-1.

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

Goncalves da Silva, Maysa Siqueira published the artcileVolatile fatty acids from whey volatilome as potential soil fumigants to control Meloidogyne incognita, Application In Synthesis of 106-32-1, the main research area is whey volatilome potential soil fumigant control Meloidogyne incognita.

Organic residues emit volatile organic compounds (VOCs) that are toxic to plant-parasitic nematodes (PPNs). In this study, we demonstrated that whey produced by cow milk emit VOCs that are toxic to Meloidogyne incognita second-stage juveniles (J2), causing immobility above 80% and significant (P < 0.05) mortality compared to controls. The anal. of the volatilome done by gas chromatog. coupled with mass spectrometry revealed 28 compounds, predominantly carboxylic acids and esters. Four of those volatile fatty acids (VFAs), namely acetic acid, octanoic acid, Et octanoate, and isovaleric acid, were chosen to further studies. The four tested VFAs were toxic to M. incognita J2, with lethal concentration values required to kill 50% of the nematode population (LC50), ranging from 134.30 to 236.08μg mL-1. However, on eggs, only acetic acid and Et octanoate were consistent with J2 hatch inhibition, reaching 80% at a concentration of 1000μg mL-1. In a greenhouse assay, when the VFAs were applied as soil fumigant, M. incognita infectivity and reproduction were significantly (P < 0.05) reduced compared to the neg. control (water). Among them, Et octanoate application reduced (P < 0.05) the number of eggs to the level of the com. fumigant dazomet. Overall, the volatile compounds released by whey were toxic to M. incognita J2 and contained a great diversity of mols. Among the VFAs, Et octanoate stood out and showed the potential to be used in future field studies. Crop Protection published new progress about Carboxylic acids Role: AGR (Agricultural Use), BIOL (Biological Study), USES (Uses). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Application In Synthesis of 106-32-1.

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

Goncalves da Silva, Maysa Siqueira published the artcileVolatile fatty acids from whey volatilome as potential soil fumigants to control Meloidogyne incognita, Application In Synthesis of 123-29-5, the main research area is whey volatilome potential soil fumigant control Meloidogyne incognita.

Organic residues emit volatile organic compounds (VOCs) that are toxic to plant-parasitic nematodes (PPNs). In this study, we demonstrated that whey produced by cow milk emit VOCs that are toxic to Meloidogyne incognita second-stage juveniles (J2), causing immobility above 80% and significant (P < 0.05) mortality compared to controls. The anal. of the volatilome done by gas chromatog. coupled with mass spectrometry revealed 28 compounds, predominantly carboxylic acids and esters. Four of those volatile fatty acids (VFAs), namely acetic acid, octanoic acid, Et octanoate, and isovaleric acid, were chosen to further studies. The four tested VFAs were toxic to M. incognita J2, with lethal concentration values required to kill 50% of the nematode population (LC50), ranging from 134.30 to 236.08μg mL-1. However, on eggs, only acetic acid and Et octanoate were consistent with J2 hatch inhibition, reaching 80% at a concentration of 1000μg mL-1. In a greenhouse assay, when the VFAs were applied as soil fumigant, M. incognita infectivity and reproduction were significantly (P < 0.05) reduced compared to the neg. control (water). Among them, Et octanoate application reduced (P < 0.05) the number of eggs to the level of the com. fumigant dazomet. Overall, the volatile compounds released by whey were toxic to M. incognita J2 and contained a great diversity of mols. Among the VFAs, Et octanoate stood out and showed the potential to be used in future field studies. Crop Protection published new progress about Carboxylic acids Role: AGR (Agricultural Use), BIOL (Biological Study), USES (Uses). 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Application In Synthesis of 123-29-5.

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