Category: esters-buliding-blocks

Li, Huamin published the artcileComparison of fermentation behaviors and properties of raspberry wines by spontaneous and controlled alcoholic fermentations, Safety of Ethyl nonanoate, the main research area is Saccharomyces raspberry wine alc fermentation; Alcoholic fermentation; HS-GC-IMS; Raspberry wine; Sensory evaluation; T. delbrueckii; Volatile compounds.

Torulaspora delbrueckii is a widely studied non-Saccharomyces yeast, described as having a pos. impact on the organoleptic quality of wines, however, little is known about its impact on the production of raspberry wine. In this study, we compared combined use of S. cerevisiae/T. delbrueckii pair, i.e., in sequential inoculation (RT) and co-fermentation (RC) modes, with spontaneous fermentation (RU) and single S. cerevisiae inoculation (RS), on various properties of raspberry wine including fermentation behaviors (using yeast counts and next-generation sequencing method), basic composition (by OIV, 2019), volatile profile (using headspace-gas chromatog.-ion mobility spectrometry), sensory property (by quant. descriptive analyses) and biogenic amine levels. All the alc. fermentations were completed within 9 days; T. delbrueckii was inhibited by S. cerevisiae in the co-culture; and Saccharomyces and Mrakia were the most abundant species in RU. A total of 40 aromas was identified, with RT abundant in volatile esters, ketones and terpenes and others showing relatively lower intensities. During sensory evaluation, RT was characterized by ‘fruity’ and ‘sweet’ notes; RC was notable for a high ‘floral’ attribute; RU scored the highest in ‘pungent’ and RS showed intermedium intensities for most descriptors. Partial least squares regression showed the relationship between aromas and sensory descriptors. As for biogenic amine, RU contained the highest total amount and RS had the least. Overall, RT had greater potential to be used in the production of raspberry wine.

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

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

Yao, Di published the artcileEffect of microbial communities on the quality characteristics of northeast soybean paste: Correlation between microorganisms and metabolites, Quality Control of 111-11-5, the main research area is soybean paste microorganism metabolite microbial community.

To systematically explore the impact of microbial community composition on the quality characteristics of northeast soybean paste, the microbial community structure was determined by high-throughput sequencing technol. and the flavor substance, free amino acid (FAA) and biogenic amine (BA) contents were determined by HS-SPME-GC-MS and HPLC. Furthermore, the correlation between microorganisms and metabolites was investigated. The results indicated that the core bacteria mainly included Tetragenococcus, Bacillus and Lactobacillus; Candida_f__norank, Wickerhamomyces and Aspergillus were the dominant fungi. A total of 139 flavor compounds were detected in all samples, and decamethylcyclopentasiloxane, isoamyl phenylacetate and octamethylcyclotetrasiloxane accounted for the highest proportion. A total of 24 FAAs were detected in the soybean paste. Pantoea, Kroppenstedtia and Kocuria were significantly pos. correlated with most FAAs (p < 0.05). Addnl. 5 BAs were detected in the soybean paste, and the contents of BAs in Y4 were highest, which was affected by different microbes. This study provided relevant information for the microbial community composition and metabolites of northeast soybean paste, which was of great significance for understanding the characteristics and safety of soybean paste. LWT--Food Science and Technology published new progress about Acaulium. 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

Katam, Keerthi published the artcileEffect of solids retention time on the performance of alga-activated sludge association in municipal wastewater treatment and biofuel production, Computed Properties of 110-42-9, the main research area is Chlorella Scenedesmus activated sludge municipal wastewater treatment biofuel production.

Abstract: This research studied the effect of solids retention time (SRT) on algal-activated sludge (AAS) association in carbon-nitrogen-phosphorus removal and lipid synthesis from municipal wastewater. Five 500-mL test reactors were operated at different SRTs (2, 4, 6, 8, and 10 days) parallelly, in a draw-and-fill mode with external aeration. The organic carbon (C), nitrogen (N), and phosphorus (P) removal were pos. correlated with SRT. The highest C, N, and P removal rates of 89, 73, and 91% were observed at 10-day SRT. The algal percentage was more than 60% in the mixed biomass at all the SRTs at a steady state. The lipid content ranged from 15 to 30% and declined with an increase in SRT, with 60% saturated and monounsaturated fatty acid at all the SRTs. The cetane number varied from 56 to 64 indicating a good-quality biofuel. The Fourier transform IR spectroscopy transmittance spectrum for 10-day SRT biomass showed the presence of chloroalkane, alcs., phenols, alkane, esters, allene, alkynes, and phosphine. The AAS system can be used as the main treatment unit for treating municipal wastewater in a single reactor with SRT greater than 4 days.

Journal of Applied Phycology published new progress about Aeration. 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

Varela, Cristian published the artcileEffect of aeration on yeast community structure and volatile composition in uninoculated chardonnay wines, Quality Control of 106-32-1, the main research area is uninoculated chardonnay wine aeration yeast community structure volatile composition.

Uninoculated wines are regarded as having improved mouthfeel and texture and more complex flavor profiles when compared to wines inoculated with com. S. cerevisiae strains. Uninoculated fermentation involves a complex microbial succession of yeasts and bacteria during fermentation Microbial population dynamics are affected by several factors that can ultimately determine if a particular species or strain contributes to wine aroma and flavor. In this work, we have studied the effect of aeration, a common winemaking practice, on the yeast microbiota during uninoculated Chardonnay wine fermentation The timing of aeration and then aeration intensity were evaluated across two successive vintages. While the timing of aeration significantly impacted fermentation efficiency across oxygen treatments, different levels of aeration intensity only differed when compared to the non-aerated control ferments. Air addition increased the viable cell population size of yeast from the genera Hanseniaspora, Lachancea, Metschnikowia and Torulaspora in both vintages. While in 2019, a high relative abundance was found for Hanseniaspora species in aerated ferments, in 2020, T. delbrueckii was visibly more abundant than other species in response to aeration. Accompanying the observed differences in yeast community structure, the chem. profile of the finished wines was also different across the various aeration treatments. However, excessive aeration resulted in elevated concentrations of Et acetate and acetic acid, which would likely have a detrimental effect on wine quality. This work demonstrates the role of aeration in shaping yeast population dynamics and modulating a volatile profile in uninoculated wines, and highlights the need for careful air addition to avoid a neg. sensory impact on wine flavor and aroma.

Fermentation published new progress about Aeration. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Quality Control of 106-32-1.

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

Zheng, Xiu-Cheng published the artcilePreparation and catalytic performance of tungstophosphoric acid anchored to SiO2@graphene aerogel 3D porous catalysts for the synthesis of ethyl levulinate biofuel, Related Products of esters-buliding-blocks, the main research area is ethyl levulinate biofuel esterification catalyst levulinic acid ethanol; tungstophosphoric acid silica graphene aerogel porous catalyst.

As fuel additives, Et levulinate (EL) can be used up to 5 wt% directly in the regular diesel engines, which can overcome the limited stock of fossil fuels and reduce the environment pollutions to some extent. In this work, the three-dimensional porous hybrids consisting of SiO2 and graphene aerogel, which are denoted as SiO2@GA, are facilely assembled and used as supports for H3PW12O40 (HPW)-based solid acid catalysts. Structural anal. confirms that the resultant HPW/SiO2@GA catalysts possess unique porous structure (SBET ≥ 257 m2 g-1, Vp ≥ 0.450 cm3 g-1) and exhibit excellent catalytic performance in the synthesis of EL by the esterification of levulinic acid (LA) with ethanol. The conversion of LA can be as high as 92.4% under the reaction conditions. Furthermore, various catalytic reaction parameters are also optimized over the 10 weight% HPW/SiO2@GA catalysts, which exhibit the highest turnover frequency (TOF = 83.91 mmol g-1 h-1) among the resultant catalysts. The results confirm the promising application of the HPW/SiO2@GA heterogeneous catalysts in the synthesis of biofuel.

Journal of Porous Materials published new progress about Aerogels. 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

Gyori, Eniko published the artcileSupercritical CO2 extraction and selective adsorption of aroma materials of selected spice plants in functionalized silica aerogels, Application of Ethyl 4-oxopentanoate, the main research area is supercritical CO2 extraction squalene spathulenol adsorption silica aerogel.

Static supercritical fluid extraction has been used to concentrate the aroma materials of common herbs and spices. The technique has provided a higher number of components and cleaner extract than the one-step ethanol maceration. The one-step supercritical fluid extraction of the aroma compounds has been combined with their in situ adsorption in hydrophilic and hydrophobic silica aerogels. The extracts have been analyzed by a GC-MS technique and 55 aroma compounds have been identified. Most of the compounds have been adsorbed in both polar and apolar silica aerogels with no direct connection with the surface polarity. However, previously undetected compounds enriched to an anal. significant level, while others competed with each other for the active sites on the surface. Functionalized silica aerogels can be used as a new type of aroma storage materials and as selective and tuneable adsorbents for the extraction and enrichment of potentially active components from a complex matrix.

Journal of Supercritical Fluids published new progress about Aerogels. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Application of Ethyl 4-oxopentanoate.

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

Khachatoorian, Careen published the artcileTracing the movement of electronic cigarette flavor chemicals and nicotine from refill fluids to aerosol, lungs, exhale, and the environment, Computed Properties of 140-11-4, the main research area is aerosol lung nicotine electronic cigarette; Electronic cigarettes; Environmental contamination; Flavor chemicals; Human exposure; Nicotine; Retention.

Given the high concentrations of nicotine and flavor chems. in EC (electronic cigarette) fluids, it is important to determine how efficiently they transfer to aerosols, how well they are retained by users (exposure), and if they are exhaled into the environment where they settle of surfaces forming ECEAR (EC exhaled aerosol residue). To quantify the flavor chems. and nicotine in refill fluids, inhaled aerosols, and exhaled aerosols. Then deduce their retention and contribution to ECEAR. Flavor chems. and nicotine were identified and quantified by GC-MS in two refill fluids, smoking machine-generated aerosols, and aerosols exhaled by 10 human participants (average age 21; 7 males). Machine generated aerosols were made with varying puff durations and two wattages (40 and 80). Participants generated exhale ad libitum; their exhale was quantified, and chem. retention and contribution to ECEAR was modeled.””. Dewberry Cream”” had five dominant (≥1 mg/mL) flavor chems. (maltol, ethyl maltol, vanillin, Et vanillin, furaneol), while “”Cinnamon Roll”” had one (cinnamaldehyde). Nicotine transferred well to aerosols irresp. of topog.; however, transfer efficiencies of flavor chems. depended on the chem., puff volume, puff duration, pump head, and EC power. Participants could be classified as “”mouth inhalers”” or “”lung inhalers”” based on their exhale of flavor chems. and nicotine and retention. Lung inhalers had high retention and exhaled low concentrations of EC chems. Only mouth inhalers exhaled sufficient concentrations of flavor chems./nicotine to contribute to chem. deposition on environmental surfaces (ECEAR). These data help distinguish two types of EC users, add to our knowledge of chem. exposure during vaping, and provide information useful in regulating EC use.

Chemosphere published new progress about Aerosols. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Computed Properties of 140-11-4.

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

Guo, Weihong published the artcileMajor constituents of cannabis vape oil liquid, vapor and aerosol in California vape oil cartridge samples, Application of Methyl decanoate, the main research area is cannabis vape oil liquid vapor aerosol major constituent GCMS; EVALI (e-cigarette or vaping product use-associated lung injury); GC-MS; aerosol; delta-9 tetrahydrocannabinol; nontarget; toxin; vape oil; vapor.

During the E-cigarette or Vaping product use Associated Lung Injury (EVALI) outbreak of August 2019 to Feb. 2020, the California Department of Public Health, Food and Drug Laboratory Branch received numerous cannabis vape oil cartridge investigation samples from throughout the state. Many of these products were directly linked to patients; others were collected as part of investigations. We determined the major ingredients and additives in twelve unused cannabis vape oil cartridge samples obtained before (n = 2) and during the EVALI outbreak (n = 10) in California from Sept. 2018 to Dec. 2019. We tested for major constituents in vape oil liquid, vape oil vapor, and vape oil aerosol phases. A nontargeted Gas Chromatog. Mass Spectrometry direct injection screening method was developed for vape oils, a headspace heating module used for vape oil vapors and a solid-phase microextraction (SPME) vaping rig for aerosols generated by vaping. We have identified more than 100 terpenes and natural extracts, 19 cannabinoids, and other potential toxic additives such as Vitamin E Acetate, Polyethylene Glycols, and Medium Chain Triglycerides. We determined more terpenes and minor cannabinoids can be produced via vaporizing and aerosolizing the vape oil. Delta9-THC and potential toxic additives were found at lower levels in the vapor and aerosol than in the vape liquid

Frontiers in Chemistry (Lausanne, Switzerland) published new progress about Aerosols. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Application of Methyl decanoate.

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

Guo, Weihong published the artcileMajor constituents of cannabis vape oil liquid, vapor and aerosol in California vape oil cartridge samples, SDS of cas: 111-11-5, the main research area is cannabis vape oil liquid vapor aerosol major constituent GCMS; EVALI (e-cigarette or vaping product use-associated lung injury); GC-MS; aerosol; delta-9 tetrahydrocannabinol; nontarget; toxin; vape oil; vapor.

During the E-cigarette or Vaping product use Associated Lung Injury (EVALI) outbreak of August 2019 to Feb. 2020, the California Department of Public Health, Food and Drug Laboratory Branch received numerous cannabis vape oil cartridge investigation samples from throughout the state. Many of these products were directly linked to patients; others were collected as part of investigations. We determined the major ingredients and additives in twelve unused cannabis vape oil cartridge samples obtained before (n = 2) and during the EVALI outbreak (n = 10) in California from Sept. 2018 to Dec. 2019. We tested for major constituents in vape oil liquid, vape oil vapor, and vape oil aerosol phases. A nontargeted Gas Chromatog. Mass Spectrometry direct injection screening method was developed for vape oils, a headspace heating module used for vape oil vapors and a solid-phase microextraction (SPME) vaping rig for aerosols generated by vaping. We have identified more than 100 terpenes and natural extracts, 19 cannabinoids, and other potential toxic additives such as Vitamin E Acetate, Polyethylene Glycols, and Medium Chain Triglycerides. We determined more terpenes and minor cannabinoids can be produced via vaporizing and aerosolizing the vape oil. Delta9-THC and potential toxic additives were found at lower levels in the vapor and aerosol than in the vape liquid

Frontiers in Chemistry (Lausanne, Switzerland) published new progress about Aerosols. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, SDS of cas: 111-11-5.

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

Yu, Huan published the artcileDecomposition efficiency and aerosol by-products of toluene, ethyl acetate and acetone using dielectric barrier discharge technique, COA of Formula: C9H10O2, the main research area is toluene ethyl acetate aerosol decomposition efficiency dielec barrier discharge; Aerosol by-products; Decomposition efficiency; Dielectric barrier discharge; Particle size distribution; VOC treatment.

Dielec. barrier discharge (DBD) has been widely used as end-of-pipe technol. to degrade low-concentration volatile organic compound (VOC) emissions. In this work, the influence of DBD conditions including discharge voltage, VOC residence time in DBD plasma, VOC initial concentration and synergistic effect of multiple VOC mixing on the decomposition efficiency of three VOCs (toluene, Et acetate and acetone) were investigated systematically. One focus of this work was to investigate size distribution and chem. composition of aerosol byproducts. The results suggested that high discharge voltage, long residence time and low VOC initial concentration would increase VOC removal ratio and their conversion to CO2. Among the three VOCs, toluene was easiest to form particles with a mode diameter between 40 and 100 nm and most difficult to be decomposed completely to CO2. Maximum aerosol yield from toluene was observed to account for 13.1 ± 1.0% of initial concentration (400 ppm) in the condition of discharge voltage 6 kV and residence time 0.52 s. Gas chromatog.-mass spectrometry anal. showed that non-nitrogen containing benzene derivatives, nitrophenol derivatives and amines were the main components of toluene aerosol byproducts. For Et acetate and acetone, aerosols could only be produced in the condition of high discharge voltages (>7.5 kV) and long gas residence time (≥0.95 s) with a bimodal distribution below 20 nm. When the mixture of three VOCs was fed into the plasma, we observed a strong synergistic effect that led to higher VOC removal ratio, but lower conversion of decomposed VOCs to CO2 and aerosols.

Chemosphere published new progress about Aerosols. 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