Esters-buliding-blocks

Aszyk, Justyna published the artcileConcentration levels of selected analytes in the gas phase of an e-cigarette aerosol, Related Products of esters-buliding-blocks, the main research area is electronic cigarette gas phase aerosol.

The aerosols generated from e-cigarettes are composed of liquid and gas phases resulting from vaporized e-liquid The apportioning of substances from e-liquid into the liquid and gas phases during e-cigarette use has not been extensively studied. Partitioning of e-liquid components between the gas and the liquid phase of the aerosol influences the substances inhaled and exhaled by the users, leading to second-hand exposure. It seems important to determine which compounds and how much of them are transferred into the gas phase and may immediately enter the bloodstream. For this purpose, a method based on thermal desorption followed by gas chromatog. coupled with tandem mass spectrometry (GC-MS/MS) in electron ionization mode was developed. As in a previous study, an automatic generator of an aerosol from an e-cigarette with a collection tube filled with melt-blown non-woven fabric disks and equipped with Tenax TA sorption tubes was used. The melt-blown non-woven fabric is designed to capture liquid phase compounds, while sorption tubes are meant to sorb compounds in the gas phase of the aerosol. To control the e-liquid mass changes before and after a puff session, quantitation based on the mass change tracking approach (MCT) was applied. Accuracy of the developed method ranged between 91% and 110% regardless of the spiking level, with precision and reproducibility better than 10%. The limits of detection (LODs) ranged from 0.015 to 0.076 ng of substance emitted/mg of consumed e-liquid, while limits of quantitation (LOQs) ranged from 0.045 to 0.23 ng of substance emitted/mg of consumed e-liquid Most of the compounds are deposited in the liquid phase of the aerosol, while only trace levels of some substances may be observed in an actual, non-condensed gas phase.

Microchemical Journal published new progress about Adsorption. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Related Products of esters-buliding-blocks.

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

Jaoued-Grayaa, Najeh published the artcileDesign of molecularly imprinted polymer materials relying on hydrophobic interactions, Formula: C16H30O2, the main research area is acrylic molecularly imprinted polymer crosslinking hydrophobic silica adsorption kinetics.

The design of molecularly imprinted polymers (MIPs) for the specific binding of hydrophobic mols. (mitotane) was investigated by considering monomers and crosslinking agents with variable hydrophobic character, Me methacrylate, Bu methacrylate and lauryl methacrylate as functional monomers, and ethylene glycol dimethacrylate and 1,6-hexanediol dimethacrylate as crosslinking agents. MIPs were bound to a porous silica support by means of a radical transfer reaction with grafted 3-mercaptopropyl groups. Equilibrium adsorption isotherms to molecularly imprinted and non-imprinted materials were modeled with the Volmer and Langmuir-Volmer isotherms, giving the thermodn. parameters of adsorption. The most hydrophobic monomer provided the highest selective adsorption although strong non-selective adsorption and the intrinsic softness of poly(lauryl methacrylate) is detrimental to selectivity. Adsorption was exothermic with a predominant enthalpic contribution. Adsorption kinetics were fast due to the high accessibility of mol. imprints on the surface of the thin MIP layer coating the porous silica support.

Colloids and Surfaces, A: Physicochemical and Engineering Aspects published new progress about Adsorption. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Formula: C16H30O2.

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

Zhao, Deyang published the artcileInsights into bimetallic synergistic effect towards γ-valerolactone production under Co doped Zr-TiO2, HPLC of Formula: 539-88-8, the main research area is titanium oxide valerolactone production structural optical property.

Co doped into 5% Zr-TiO2 (Co@5% Zr/-TiO2) was prepared by a simple, facile sol-gel method, and employing in the catalytic transfer hydrogen (CTH) process starting from Et levulinate (EL) to γ-valerolactone (GVL). Lewis/Bronsted acid ratio and BET surface area increased with the incorporation of Co into Ti-Zr-O support. In addition, the synergistic effect between Co-Zr in TiO2 enhanced the strong acid strength sites. Co@5% Zr-TiO2 exhibited the highest catalytic performance (EL conversion 95%, GVL yield 88%) under optimum condition (0.2 M EL, 15 mL 2-PrOH, 190°C, 11 h). Noticeably, Co@5% Zr-TiO2 exhibited higher stability in 4th recycling experiments as compared to 5% Zr-TiO2 under identical condition. From computational calculation, EL adsorption process was more spontaneous with ΔEad= -8.240 eV. The protonation process made the reactants get close to the surface with a bonded O12-Ti2.179 Å and O6-Zr of 2.376 Å. Finally, GVL showed a strong leaving trend after the formation.

Molecular Catalysis published new progress about Adsorption. 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

Riboni, N. published the artcileA simple and efficient Solid-Phase Microextraction – Gas Chromatography – Mass Spectrometry method for the determination of fragrance materials at ultra-trace levels in water samples using multi-walled carbon nanotubes as innovative coating, HPLC of Formula: 6259-76-3, the main research area is fragrance material multiwalled CNT SPE GC MS water pollution; Emerging contaminants; Fragrance materials; Multi-walled carbon nanotubes; Personal care products; Solid-phase microextraction; Water sample.

The occurrence of emerging contaminants is becoming of increasing importance to assess the impact of anthropogenic activities onto the environment. The present study reports for the first time the development and validation of an efficient method for the simultaneous determination of fragrance materials in water samples based on the use of a novel multiwalled carbon nanotubes (MWCNTs)-based solid-phase microextraction coating. Helical MWCNTs were selected as adsorbent material due to their outstanding extraction performance. The multicriteria method of desirability functions allowed the optimization of the exptl. conditions in terms of extraction time and extraction temperature Validation proved the reliability of the method for the determination of the analytes at ultra-trace levels, obtaining detection limits in the 0.2-13 ng/L range, good precision, with relative standard deviations lower than 20% and recovery rates in the 80 ± 12%-111 ± 11%. Superior enrichment factors compared to com. fibers were also calculated Finally, applicability to real sample anal. was demonstrated.

Talanta published new progress about Adsorbents. 6259-76-3 belongs to class esters-buliding-blocks, name is Hexyl 2-hydroxybenzoate, and the molecular formula is C13H18O3, HPLC of Formula: 6259-76-3.

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

Mohan, Akhil published the artcileLiquid fuel from waste tires: novel refining, advanced characterization and utilization in engines with ethyl levulinate as an additive, Product Details of C7H12O3, the main research area is ethyl levulinate additive liquid fuel waste tire engine.

Pyrolysis is a promising thermochem. strategy to convert scrap tires into diesel-like fuels. Crude tire pyrolysis oil (CTPO) was produced in a 10 ton rotating autoclave reactor by thermal depolymerization of the tire polymers. In this work, the prior-reported straightforward and inexpensive strategy of upgrading CTPO using a combination of silica gel (as adsorbent) and petroleum ether (as the solvent) has been scaled up with minimal loss in mass of oil and improved physicochem. characteristics (e.g., lowered acid value, low sulfur content). The upgraded TPO (StTPO) was characterized extensively to better understand their chem. compositions, physicochem. properties, and combustion characteristics. StTPO was mixed with diesel in different volumetric proportions and the blends were studied for performance and emission characteristics in a single-cylinder engine. The use of biomass-derived Et levulinate (EL) as a fuel oxygenate improved the cold-flow properties of StTPO-diesel blends as well as lowered the exhaust emissions (e.g., lower NOx). A fuel blend consisting of 50% diesel, 40% StTPO, and 10% EL demonstrated the best fuel properties in the single-cylinder diesel engine.

RSC Advances published new progress about Adsorbents. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Product Details of C7H12O3.

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

Han, Linglin published the artcileMussel-inspired, robust and self-healing nanocomposite hydrogels: Effective reusable absorbents for removal both anionic and cationic dyes, Synthetic Route of 142-90-5, the main research area is self healing nanocomposite hydrogel adsorbent dye removal.

Polydopamine (PDA) composited LAPONITE cross-linked hydrophobically associated (PLHA) hydrogels were facilely constructed by in situ polymerization The PLHA hydrogel exerted improved mech. properties and excellent stability with an addnl. crosslinking agent LAPONITE, which guaranteed the hydrogel could be utilized for long-time and reusable application. Notably, the self-healing property of PLHA gels could be achieved easily by the hereinafter three factors: hydrophobic association, LAPONITE and PDA. Compared with the pristine hydrophobic associated (HA) gel, excellent dye adsorption capacity toward both anionic and cationic dyes came out in PLHA gels owing to the neg. charges on LAPONITE and abundant functional groups on PDA nanoparticles such as amine groups, catechol groups and aromatic moieties. The PLHA gels could bind organic dyes via various ways, including coordination, electrostatic interaction, hydrogen bonding or π-π stacking interaction. Compared with the reported works, our proposed method provided the opportunity to prepare a novel robust, self-healing phys. dual cross-linked hydrogels, which have the potential to be applied in tissue engineering and the reusable adsorbents of organic colorants.

Colloids and Surfaces, A: Physicochemical and Engineering Aspects published new progress about Adsorbents. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Synthetic Route of 142-90-5.

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

Shabnam, Rukhsana published the artcileCumulative effect of hydrophobic PLMA and surface epoxide groups in composite polymer particles on adsorption behavior of congo red and direct red-75, Related Products of esters-buliding-blocks, the main research area is composite polymer particle hydrophobic PLMA epoxide dye adsorption.

Industrial applications of hydrophobic materials are numerous, particularly as adsorption beads to remove organic pollutants. In this research combined effect of hydrophobicity and reactive epoxide group on the adsorption behavior of dye mols. by composite polymer particles was investigated. Lauryl methacrylate (LMA) a poor water soluble long chain vinyl monomer is com. available. Polystyrene/poly(LMA-divinyl benzene) or PS/P(LMA-DVB) composite seed particles were first prepared by slightly modified activated swelling of micron-sized PS seed particles utilizing either water or water-ethanol dispersion medium. The influence of poly(vinyl alc.) (PVA) as steric stabilizer on the size and size distribution was evaluated. The poor solubility of LMA in the continuous phase hindered the homogeneous swelling of PS particles even in the presence of ethanol (5% weight/weight) and resulted in fairly polydispersed PS/P(LMA-DVB) composite seed particles. The composite seed particles were then functionalized with epoxide group by seeded polymerization of glycidyl methacrylate (GMA) to produce PS/P(LMA-DVB)/PGMA composite polymer particles. The epoxide functionalized PS/P(LMA-DVB)/PGMA composite polymer particles were used to adsorb two kinds of azo dyes, congo red (CR) and direct red-75 (DR-75). The effects of initial dye concentration at 303 and 323 K on adsorption behavior were investigated and the adsorption was explained by adsorption isotherms. Temperature dependent adsorption measurements were also carried out at identical initial dye concentration The adsorption results showed that inclusion of reactive epoxide group on/near the surface of hydrophobic PS/P(LMA-DVB) composite seed particles improved the adsorption capacity of dye mols.

Arabian Journal of Chemistry published new progress about Adsorbents. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Related Products of esters-buliding-blocks.

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

Nurerk, Piyaluk published the artcileSolid-phase extraction based on MIL-101 adsorbent followed by gas chromatography tandem mass spectrometry for the analysis of multiclass organic UV filters in water, Recommanded Product: Isopentyl 3-(4-methoxyphenyl)acrylate, the main research area is UV filter water pollution detection Metal organic framework adsorbent; Experimental design; Gas chromatography tandem mass spectrometry; Metal organic frameworks; Solid-phase extraction; UV filters.

A metal organic framework material MIL-101 was developed as an effective solid-phase extraction adsorbent for the extraction of eleven UV filters compounds The MIL-101 adsorbent was packed into a polypropylene cartridge and connected at the outlet tip with the Visiprep vacuum manifolds allowing process up to 12-port SPE samples, simultaneously. The extracted UV filters were quantified by gas chromatog.-tandem mass spectrometry. Several parameters affecting the extraction efficiency of the target analytes, i.e. desorption conditions, sample pH, the addition of salt and sample volume were optimized by ANOVA anal. followed by a multifactorial design. The sample breakthrough volume of the developed method was also evaluated. The SPE-GC-MS/MS method was validated in terms of linearity (R2 ≥ 0.9973), accuracy (with satisfactory recovery from 82% to 105%), precision (relative standard deviation of less than 10%) and limits of detection ranging from 1.0 to 11.7 ng L-1. The validated method was successfully applied for the extraction and quantification of the target UV filters in different types of water samples, including lake, river, seawater and swimming pool waters. The most often found UV filters were octocrylene, 4-methylbencylidene camphor and homosalate that also came out with the highest concentrations, up to 4000 ng L-1, particularly in swimming pool waters.

Journal of Chromatography A published new progress about Adsorbents. 71617-10-2 belongs to class esters-buliding-blocks, name is Isopentyl 3-(4-methoxyphenyl)acrylate, and the molecular formula is C15H20O3, Recommanded Product: Isopentyl 3-(4-methoxyphenyl)acrylate.

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

Du, Changsheng published the artcileProperty Regulation of Conjugated Oligoelectrolytes with Polyisocyanide to Achieve Efficient Photodynamic Antibacterial Biomimetic Hydrogels, Product Details of C24H14Cl2O7, the main research area is polyisocyanide conjugated oligoelectrolyte biomimetic hydrogel property regulation; antibacterial biomimetic hydrogel; conjugated oligoelectrolyte; photodynamic therapy; polyisocyanide; reactive oxygen species.

Fabricating antibacterial hydrogels with antimicrobial drugs and synthetic biocompatible biomimetic hydrogels is a promising strategy for practical medical applications. Here, we report a bicomponent hydrogel composed of a biomimetic polyisocyanopetide (PIC) hydrogel and a photodynamic antibacterial membrane-intercalating conjugated oligoelectrolyte (COE). The aggregation behavior and aggregate size of the COEs in water can be regulated using the PIC hydrogel, which could induce COEs with higher reactive oxygen species (ROS) production efficiency and increased association of COEs toward bacteria, therefore enhancing the antibacterial efficiency. This strategy provides a facile method for developing biomimetic hydrogels with high antibacterial capability.

ACS Applied Materials & Interfaces published new progress about Adsorbents. 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, Product Details of C24H14Cl2O7.

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

Marsaulina, Hutagaol Debora published the artcileApplication of ultraviolet spectrophotometry with dual wavelength method for the simultaneous determination of ecstasy tablet content, Computed Properties of 55981-09-4, the main research area is methylene dioxymetamphetamine methamphetamine aracetamol caffeine ephedrine dual wavelength method.

Ecstasy is a type of narcotic tablet and is very popularly used as a stimulant. The main content is Methylene dioxymetamphetamine (MDMA) and Methamphetamine (MA), but because a large amount of demand is not balanced with sufficient supply, ecstasy tablets are often adulterated with various contents, such as Paracetamol (PCT), Caffeine (KFN) and Ephedrine (EFD). Ecstasy tablets are often combined with other active compounds so that they can cause problems in determining the levels of tablets carried out in the Police Forensic Lab, so a cheaper, effective, and fast method is needed in determining the levels of these tablets. The research was conducted exptl. with the spectrophotometric method, namely the dual-wavelength method, then the validation was tested based on the validation parameters, namely linearity, accuracy, precision, LOD and LOQ. Then, this method was applied to determine levels of MA, EFD, KFN and PCT in tablet preparations The results showed that the application of the dual-wavelength method for the assay was carried out at λ 250.6 nm and 263 nm for KFN, at λ 263 nm and 281.8 nm for MA, at λ 259.4 nm and 255 nm for PCT at λ 255 nm and 236 nm for EFD, resp. with a level result of 40.05; 1.63; 38.11; 20.21 for MA, EFD, KFN and PCT resp., and with good precision and accuracy. The dual-wavelength UV spectrophotometric method was successfully applied to determine the levels of MA, EFD, KFN and PCT mixtures in tablets.

Asian Journal of Pharmaceutical Research and Development published new progress about Absorption. 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, Computed Properties of 55981-09-4.

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