Tag: M.W=200-250

Verhagen, Rory published the artcileCalibration parameters for the passive sampling of organic UV filters by silicone; diffusion coefficients and silicone-water partition coefficients, Application In Synthesis of 71617-10-2, the main research area is organic UV filter passive sampling silicone water partition coefficient; Diffusion coefficient; Organic UV filters; Partition coefficient; Passive sampling; Single dose design.

In recent years, organic UV filters (UVFs) received considerable attention as a group of emerging contaminants, including in Australia where the use of UVFs is particularly relevant. Passive sampling using polymers has become widely used for routine monitoring of chems. in the aquatic environment. Application of passive samplers for monitoring chems. in the water relies on calibration data such as chem.’s polymer-water partition coefficient (Kpw) and diffusion coefficients in the sampling material (Dp), for understanding uptake and kinetic limitations. In the present study, Kpw and Dp for nine UVFs were estimated Kpw values were determined in different water – polymer partition experiments where (1) a given mass of chems. was dosed into the water and (2) into the polymer. Diffusion coefficients were determined using the stacking method. The estimated log Kpw and log Dp ranged from 2.9 to 6.4 L kg-1 and -11.1 to -10.5 m2s-1, resp. The sufficient high Dp allows application of kinetic models that only consider water boundary-controlled uptake for converting silicone sampler uptake into an aqueous phase concentration using the presented Kpw.

Chemosphere published new progress about Diffusion. 71617-10-2 belongs to class esters-buliding-blocks, name is Isopentyl 3-(4-methoxyphenyl)acrylate, and the molecular formula is C15H20O3, Application In Synthesis of 71617-10-2.

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

Kim, Sehyun published the artcileIn Vitro and In Vivo Human Body Odor Analysis Method Using GO:PANI/ZNRs/ZIF-8 Adsorbent Followed by GC/MS, SDS of cas: 6259-76-3, the main research area is graphene oxide polyaniline zinc nanorod ZIF 8 body odor; GO:PANI/ZNRs/ZIF−8; headspace-in needle microextraction; human body odor; needle-based adsorbent; response surface methodology; volatile organic compounds.

Among various volatile organic compounds (VOCs) emitted from human skin, trans-2-nonenal, benzothiazole, hexyl salicylate, α-hexyl cinnamaldehyde, and iso-Pr palmitate are key indicators associated with the degrees of aging. In our study, extraction and determination methods of human body odor are newly developed using headspace-in needle microextraction (HS-INME). The adsorbent was synthesized with graphene oxide:polyaniline/zinc nanorods/zeolitic imidazolate framework-8 (GO:PANI/ZNRs/ZIF-8). Then, a wire coated with the adsorbent was placed into the adsorption kit to be directly exposed to human skin as in vivo sampling and inserted into the needle so that it was able to be desorbed at the GC injector. The adsorption kit was made inhouse with a 3D printer. For the in vitro method, the wire coated with the adsorbent was inserted into the needle and exposed to the headspace of the vial. When a cotton T-shirt containing body odor was transferred to a vial, the headspace of the vial was saturated with body odor VOCs. After volatile organic compounds were adsorbed in the dynamic mode, the needle was transferred to the injector for anal. of the volatile organic compounds by gas chromatog./mass spectrometry (GC/MS). The conditions of adsorbent fabrication and extraction for body odor compounds were optimized by response surface methodol. (RSM). In conclusion, it was able to synthesize GO:PANI/ZNRs/ZIF-8 at the optimal condition and applicable to both in vivo and in vitro methods for body odor VOCs anal.

Molecules published new progress about Body odor. 6259-76-3 belongs to class esters-buliding-blocks, name is Hexyl 2-hydroxybenzoate, and the molecular formula is C13H18O3, SDS of cas: 6259-76-3.

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

Velema, Willem A. published the artcileTrapping Transient RNA Complexes by Chemically Reversible Acylation, Synthetic Route of 51984-71-5, the main research area is Escherichia DsrA rpoS RNA complex acylation BINARI crosslinker; RNA complexes; acylation; bioorthogonal chemistry; crosslinking; nucleic acids.

RNA-RNA interactions are essential for biol., but they can be difficult to study due to their transient nature. While crosslinking strategies can in principle be used to trap such interactions, virtually all existing strategies for crosslinking are poorly reversible, chem. modifying the RNA and hindering mol. anal. We describe a soluble crosslinker design (BINARI) that reacts with RNA through acylation. We show that it efficiently crosslinks noncovalent RNA complexes with mimimal sequence bias and establish that the crosslink can be reversed by phosphine reduction of azide trigger groups, thereby liberating the individual RNA components for further anal. The utility of the new approach is demonstrated by reversible protection against nuclease degradation and trapping transient RNA complexes of E. coli DsrA-rpoS derived bulge-loop interactions, which underlines the potential of BINARI crosslinkers to probe RNA regulatory networks.

Angewandte Chemie, International Edition published new progress about Acylation. 51984-71-5 belongs to class esters-buliding-blocks, name is Ethyl 2-methyl-5-nitro-3-pyridinecarboxylate, and the molecular formula is C9H10N2O4, Synthetic Route of 51984-71-5.

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

Shabani, Mahtab published the artcileLong-lasting adsorption of golden flower oil on polyvinyl alcohol/clinoptilolite (PVA/CP) xerogel particles, COA of Formula: C13H18O3, the main research area is polyvinyl alc clinoptilolite xerogel golden flower oil adsorption.

The present work aimed to study the adsorption and desorption characteristics of Golden Flower Oil (GFO) on xerogel particles made of Clinoptilolite (CP), a natural zeolite and polyvinyl alc. (PVA). Firstly, chem. composition and phys. characteristics of GFO (by GC/MS) and CP (by SEM and BET) were thoroughly characterized. PVA/CP xerogel was synthesized then and characterized by SEM, BET, TGA, and DSC techniques. Adsorption of the 12 GFO components on the CP and PVA/CP xerogel surface was investigated in different concentrations of GFO components. Both adsorbents showed concentration-independent and selective adsorption for GFO components. The selective adsorption index showed a direct relationship with polarity (δP) of the components and inversely correlated with their molar volume (Vm). Adsorption isotherms of the components were fitted by Langmuir, Freundlich, and Temkin equations. Maximum monolayer GFO adsorption on PVA/CP surface was equal to 231.93 mg g-1 compared to 198.73 mg g-1 for CP as an adsorbent. The maximum desorbed amount for each of the components was directly related to the Vm parameter and the weight percentage of each GFO component in the oil and inversely related to δP. Multilayer desorbed amount from PVA/CP xerogel particles (366.03 mg g-1) was less than that for CP particles (573.36 mg g-1) supporting PVA/CP for retaining GFO for longer periods.

Applied Clay Science published new progress about Adsorption. 6259-76-3 belongs to class esters-buliding-blocks, name is Hexyl 2-hydroxybenzoate, and the molecular formula is C13H18O3, COA of Formula: C13H18O3.

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

Santana-Viera, Sergio published the artcileUV filters and UV stabilisers adsorbed in microplastic debris from beach sand, Computed Properties of 71617-10-2, the main research area is UV filter stabilizer microplastic beach sand adsorption pollution vector; Adsorption; Beach sand; Microplastics; Pollution vector; UV filters and stabilisers.

Microplastics (MPs) in oceans adsorb different types of pollutants, which can neg. impact the food chain. The extensive use of personal care products (PCPs) has led to their ubiquitous environmental presence, and their partition between plastic matrixes and surroundings is determined by their physico-chem. characteristics and environmental conditions. This work develops and applies a methodol. to determine 12 UV filters (UVFs) and UV stabilizers (UVSs) in MPs collected in beach sand. The analyzes were carried out by ultrasound-assisted extraction and ultrahigh-performance liquid chromatog. with tandem mass spectrometry detection. The validated procedure was applied to MPs samples taken in sand samples from 13 beaches on the Canary Islands (Spain). The results showed the presence of 10 UV filters and UV stabilizers at concentrations between 1 and 4031 ng·g-1, where octocrylene was the most frequently found. The target analytes were present in all the sampling beaches.

Marine Pollution Bulletin published new progress about Adsorption. 71617-10-2 belongs to class esters-buliding-blocks, name is Isopentyl 3-(4-methoxyphenyl)acrylate, and the molecular formula is C15H20O3, Computed Properties of 71617-10-2.

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

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

Cervellieri, Salvatore published the artcileMass spectrometry-based electronic nose to authenticate 100% Italian durum wheat pasta and characterization of volatile compounds, Recommanded Product: Hexyl 2-hydroxybenzoate, the main research area is electronic nose durum wheat pasta volatile compound mass spectrometry; Authentication; Chemometrics; Durum wheat pasta; Geographical origin; MS-based electronic nose; Volatile organic compounds.

Headspace solid-phase microextraction (HS-SPME) coupled with mass spectrometry-based electronic nose (MS-eNose), in combination with multivariate statistical anal. was used as untargeted method for the rapid authentication of 100% Italian durum wheat pasta. Among the tested classification models, i.e. PCA-LDA, PLS-DA and SVMc, SVMc provided the highest accuracy results in both calibration (90%) and validation (92%) processes. Potential markers discriminating pasta samples were identified by HS-SPME/GC-MS anal. Specifically, the content of a pattern of 8 out of 59 volatile organic compounds (VOCs) was significantly different between samples of 100% Italian durum wheat pasta and pasta produced with durum wheat of different origins, most of which were related to different lipidic oxidation in the two classes of pasta. The proposed MS-eNose method is a rapid and reliable tool to be used for authenticating Italian pasta useful to promote its typicity and preserving consumers from fraudulent practices.

Food Chemistry published new progress about Durum wheat. 6259-76-3 belongs to class esters-buliding-blocks, name is Hexyl 2-hydroxybenzoate, and the molecular formula is C13H18O3, Recommanded Product: Hexyl 2-hydroxybenzoate.

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

Jeon, Byoungjun published the artcileEnhanced predictive capacity using dual-parameter chip model that simulates physiological skin irritation, Application of Hexyl 2-hydroxybenzoate, the main research area is chip model skin irritation endothelium toxicity; Alternative to animal testing; Organ on a chip; Reconstructed human epidermis; Skin irritation; Skin on a chip; Toxicity.

Current alternatives to animal testing methods for skin irritation evaluation such as reconstructed human epidermis models are not fully representing physiol. response caused by skin irritants. Skin irritation is physiol. induced by the dilation and increased permeability of endothelial cells. Thus, our objectives were to mimic physiol. skin irritation using a skin-on-a-chip model and compare predictive capacities with a reconstructed human epidermis model to evaluate its effectiveness. To achieve our goals, the skin-on-a-chip model, consisting of three layers representing the epidermal, dermal and endothelial components, was adapted. Cell viability was measured using the OECD TG 439 protocol for test substance evaluation. The tight junctions of endothelial cells were also observed and measured to assess physiol. responses to test substances. These parameters were used to physiol. evaluate cell-to-cell interactions induced by test substances and quantify model accuracy, sensitivity, and specificity. Based on in vivo data, the classification accuracy of twenty test substances using a dual-parameter chip model was 80%, which is higher than other methods. Besides, the chip model was more suitable for simulating human skin irritation. Therefore, it is important to note that the dual-parameter chip model possesses an enhanced predictive capacity and could serve as an alternative to animal testing for skin irritation.

Toxicology In Vitro published new progress about Endothelium. 6259-76-3 belongs to class esters-buliding-blocks, name is Hexyl 2-hydroxybenzoate, and the molecular formula is C13H18O3, Application of Hexyl 2-hydroxybenzoate.

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

Morales, M. L. published the artcileVolatile metabolites produced by different flor yeast strains during wine biological ageing, SDS of cas: 6259-76-3, the main research area is volatile metabolite yeast strain wine biol aging; Flor yeast; GC-MS analysis; Heatmap; Sherry wine; Volatile compound.

Sherry white wine called Fino is produced by dynamic biol. ageing under the action of flor yeasts using traditional practices aimed at ensuring uniform quality and characteristics over time. These kinds of yeasts provide typical sensory properties to Fino wines. Although there are studies of the volatile composition of these wines submitted to biol. ageing in wood barrels, there is a lack of knowledge on the particular volatile profile produced by different flor yeast strains from Sherry zone wineries. For this reason, the aim of this study was to analyze the volatile profiles produced by 15 pure culture flor velum yeasts, with the goal of observing their suitability for obtaining high quality Fino sherry wines. Volatile composition was determined by dual sequential stir bar sorptive extraction, followed by GC-MS anal. All yeast strains studied produced the increase of most acetals, highlighting acetaldehyde diethylacetal which was the compound that most increased. Among terpenes, nerolidol and farnesol underwent remarkable increases. However, results showed that in a month of biol. ageing, significant differences were observed among the volatile metabolites produced by flor yeast strains studied. Only some of them stood out for their high production of volatile compounds characteristic of Sherry Fino wines, which are good candidates for producing starter cultures.

Food Research International published new progress about Metabolites. 6259-76-3 belongs to class esters-buliding-blocks, name is Hexyl 2-hydroxybenzoate, and the molecular formula is C13H18O3, SDS of cas: 6259-76-3.

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