Month: November 2022

Hydrolytic degradation of isosorbide-based polycarbonates: Effects of terminal groups, additives, and residue catalysts was written by Yan, Shengdi;Wu, Guozhang. And the article was included in Polymer Degradation and Stability in 2021.SDS of cas: 102-09-0 The following contents are mentioned in the article:

The hydrolysis degradation of bisphenol-A polycarbonate (BPA-PC), isosorbide (ISB)-co-1,4-cyclohexanedimethanol (CHDM) polycarbonate (IcC-PC), and BPA-PC/IcC-PC reactive blends were systematically investigated. The terminal hydroxyl groups of BPA-PC, thermally derived chem. structure on IcC-PC chains, and derivatives from phosphite antioxidants trigger severe hydrolysis degradation 1H-NMR anal. shows that carbonate groups connected to the BPA unit are most susceptible to hydrolysis, followed by ISB and CHDM units, demonstrating that the acidity of monomers plays a key role in the hydrolysis degradation of polycarbonates. Residual catalysts may cause significant hydrolysis in BPA-PC/IcC-PC reactive blends. Hydrolysis prefers to occur on the exo position of ISB unit with a low steric hindrance rather than on the endo position with a high electrophilicity, indicating that the residual catalyst acts as a Lewis acid and likely promotes hydrolysis through coordination mechanism. The hydrolysis resistance of BPA-PC/IcC-PC blends with a Na-based catalyst is lower than that of blends with K- and Cs-based catalysts because of the strong coordination ability. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0SDS of cas: 102-09-0).

Diphenyl carbonate (cas: 102-09-0) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.SDS of cas: 102-09-0

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

A new population of pequi (Caryocar spp.) developed by Brazilian indigenous people has agro-industrial and nutraceutical advantages was written by dos Santos da Silva, Marcelo;Alves-Santos, Aline Medeiros;dos Santos, Ingrid Duarte;Wagner, Roger;Naves, Maria Margareth Veloso;Cordeiro, Madison Willy Silva. And the article was included in European Food Research and Technology in 2020.Safety of Isopentyl hexanoate The following contents are mentioned in the article:

Abstract: Phys. and chem. properties of 190 fruit samples from 26 matrixes of a new population of Caryocar spp. were investigated. Whole fruit, named giant pequi, was composed of 67% shell (exocarp and external mesocarp) and 33% pyrene, and the edible pulp (internal mesocarp) comprised 46% pyrene and 15% total fruit mass. The pulp presented moderate contents of energy (269 kcal/100 g) and lipid (16/100 g), mainly monounsaturated fatty acids (56/100 g lipids); high carotenoid concentration (47 μg/g) and considerable phenolic content (101 mg GAE/100 g). Gallic and p-coumaric acids were the main phenolic compounds identified in the pulp, and the larger classes of volatile compounds were esters and monoterpenes, mostly Et hexanoate (44%) and β-cis-ocimene (21%). The giant pequi features higher pyrene and pulp yields, and its edible pulp has a lighter color and lower energy and lipid contents compared to those of common species of pequi, as well as is rich in carotenoids and is a source of polyphenols and volatile compounds These attributes are highly promising for agro-industrial use, with great potential for nutritional and nutraceutical applications. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Safety of Isopentyl hexanoate).

Isopentyl hexanoate (cas: 2198-61-0) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Safety of Isopentyl hexanoate

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

Effects of ultrasound and ultra-high pressure pretreatments on volatile and taste compounds of vacuum-freeze dried strawberry slice was written by Wang, Chao;Zhang, Lihui;Qiao, Yu;Liao, Li;Shi, Defang;Wang, Jun;Shi, Liu. And the article was included in LWT–Food Science and Technology in 2022.Synthetic Route of C10H20O2 The following contents are mentioned in the article:

The influences of ultra-high pressure (UHP), ultrasound (US) and their combination (UHP-US) assisted vacuum-freeze drying on volatile and taste compounds of strawberry slices were analyzed by GC-MS, HS-GC-IMS, HPLC, E-tongue as well as sensory anal. Three pretreatments of vacuum-freeze dried strawberry slices could increase the concentrations of characteristic volatile compounds (hexanoates and 2,5-dimethyl-4-methoxy-3(2H)-furanone), especially UHP-US (P < 0.05) sample, the increase of compounds associated with floral, fruity and sweet notes. Meanwhile, these pretreatments would ameliorate the taste of dried strawberry slices, individual sugars (glucose and fructose) increased, while the organic acids (malic acid and citric acid) contents decreased, which was consistent with the result of E-tongue. On the other hand, the taste of US sample was better than other samples, the glucose and fructose content (sweetness) of US sample increased by 19.42%, 23.51%, resp., whereas the malic acid content (sourness) was decreased for 5.03%. All in all, US pretreatment would help to better improve the critical flavors for vacuum-freeze dried strawberry slices. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Synthetic Route of C10H20O2).

Octyl acetate (cas: 112-14-1) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Synthetic Route of C10H20O2

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

Regional convergence in the reaction of heterosubstituted allylic carbanions via allylic aluminum and boron ate complexes was written by Yamamoto, Yoshinori;Yatagai, Hidetaka;Saito, Yoshikazu. And the article was included in Journal of Organic Chemistry in 1984.Electric Literature of C14H24O2 The following contents are mentioned in the article:

The regiochem. in reactions of heterosubstituted allylic carbanions (I) is highly controlled via allylic Al or B ate complexes which direct both carbonyl compounds and reactive halides to the α-position with high regioselectivity. For example, carbonyl compounds react with I [R = Me₂CHO (II), MeOCH₂O (III), Me₂CHS (IV), PhSe, Me₃Si] at the α-position via the ate complexes. Although the reactions of the ate complexes (V) with aldehydes generally produce a mixture of erythro and threo isomers, the Al ate complex of III gives the erythro isomer with very high stereoselectivity. This procedure is applied to the stereoselective synthesis of exo-brevicomin. With allylic halides, the II and IV substituted allylic carbanions again react at the α-position via the ate complexes. However, the coupling mode is entirely different; the α-α’ coupling product is obtained from II, while the α-γ’ coupling product is produced from IV. This study involved multiple reactions and reactants, such as (E)-Dodeca-9,11-dien-1-yl acetate (cas: 50767-78-7Electric Literature of C14H24O2).

(E)-Dodeca-9,11-dien-1-yl acetate (cas: 50767-78-7) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Electric Literature of C14H24O2

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

Macronutrient Proportions and Fat Type Impact Ketogenicity and Shape the Circulating Lipidome in Dogs was written by Jackson, Matthew Irick. And the article was included in Metabolites in 2022.Application of 26662-94-2 The following contents are mentioned in the article:

Many physiol. processes including ketogenesis are similar in dogs and humans, but there is little information available on the effect of carbohydrate restriction in dogs. Here, the ketogenicity and serum metabolic profiles of dogs were assessed after they had consumed high carbohydrate (HiCHO); high protein, low carbohydrate (PROT_LoCHO); or high fat, low carbohydrate (FAT_LoCHO) foods. Thirty-six dogs were fed HiCHO for 4 wk, then randomized to PROT_LoCHO or FAT_LoCHO for 5 wk. Dogs then crossed over to the other food for an addnl. 5 wk. Generally, reduction of dietary carbohydrate by replacement with either protein or fat increased the energy required to maintain body weight, and fat had a greater effect. Postabsorptive energy availability derived mainly from glucose and triglycerides with HiCHO, from gluconeogenic amino acids and fatty acids with PROT_LoCHO, and from fatty acids and β-hydroxybutyrate with FAT_LoCHO. This study demonstrated that the reduction of carbohydrate in canine foods is potentially beneficial to dogs based on improvements in metabolism and supports the use of low-carbohydrate foods as safe and effective for healthy adult dogs. This study involved multiple reactions and reactants, such as (2R,9Z)-1-(((2-Aminoethoxy)(hydroxy)phosphoryl)oxy)-3-(palmitoyloxy)propan-2-yl oleate (cas: 26662-94-2Application of 26662-94-2).

(2R,9Z)-1-(((2-Aminoethoxy)(hydroxy)phosphoryl)oxy)-3-(palmitoyloxy)propan-2-yl oleate (cas: 26662-94-2) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Application of 26662-94-2

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

Comparison of volatile compounds released by entomopathogenic fungi was written by Bojke, Aleksandra;Tkaczuk, Cezary;Stepnowski, Piotr;Golebiowski, Marek. And the article was included in Microbiological Research in 2018.Formula: C15H22O2 The following contents are mentioned in the article:

Entomopathogenic fungi are fungal species which are used as a potential source of biopesticides. These fungi produce secondary metabolites which in insects can cause disruption in the normal functioning of their bodies, disease or even death. In order to fully characterize the physiol. of entomopathogenic fungi we should identify the volatile organic compounds which are involved in this process. Therefore, we conducted a qual. and quant. anal. of volatile compounds produced by entomopathogenic fungi. Seven different species of fungi were analyzed: Metarhizium anisopliae, Metarhizium flavoviride, Pandora sp., Isaria fumosorosea, Hirsutella danubiensis, Batkoa sp. and Beauveria bassiana. The analyses were performed using the HS-SPME/GC-MS technique. In the analyzed fungi, 63 volatile compounds were identified and classified into the following groups: aldehydes, ketones, alcs., esters, acids, terpenes and others. The results show that entomopathogenic fungi produce a wide profile of secondary metabolites. Principal Components Anal. was used to determine whether sep. classes of fungi can be distinguished from one another based on their metabolite profiles. This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Formula: C15H22O2).

2-Ethylhexyl benzoate (cas: 5444-75-7) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Formula: C15H22O2

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

Influence of Microwave Heating on Chemical Properties of Liquefied Lignocellulosic Residues was written by Briones, Rodrigo;Serrano, Luis;Sequeiros, Ane;Labidi, Jalel. And the article was included in Industrial & Engineering Chemistry Research in 2013.Quality Control of Ethyl 3-ethoxypropanoate The following contents are mentioned in the article:

The chem. composition of liquid products obtained from liquefaction of several agro-industrial wastes was analyzed and the effects of microwave treatments were investigated, evaluating changes in chem. composition, structure, and phys. properties, looking forward to exploring new utilization routes or processing paths for these liquid products. Gas chromatog.-mass spectrometry (GC-MS) showed that the chem. components of liquefied products can be divided into several groups: furans, alcs., and esters and acid derivatives The microwave evaluation showed that irradiation at constant power levels affects the compositions of liquefied products. Fourier transform IR (FT-IR) spectroscopic anal. showed increases in the absorption bands of carbonyl and CH groups, which suggests that microwaves induced more intensive oxidation of hydroxyl groups into carbonyl groups. Elemental anal. indicated higher carbon and lower oxygen contents and higher heat heating value (20 MJ/kg) in treated products with respect to untreated samples. The use of liquefied products as a new energy source has advantages such as their liquid state, convenient energy value, and renewability. This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9Quality Control of Ethyl 3-ethoxypropanoate).

Ethyl 3-ethoxypropanoate (cas: 763-69-9) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Quality Control of Ethyl 3-ethoxypropanoate

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

Nanostructured-lipid carriers-Chitosan hydrogel beads carrier system for loading of resveratrol: A new method of topical application was written by Wu, Bi;Li, Yang;Li, Yuan Y.;Shi, Zhi H.;Bian, Xiao H.;Xia, Qiang. And the article was included in Journal of Biomaterials Applications in 2022.Related Products of 31566-31-1 The following contents are mentioned in the article:

The aim of this study was to develop nanostructured-lipid carriers (NLC) encapsulated by Chitosan hydrogel beads for the efficient topical carrier. Dynamic light scattering (DLS), X-ray diffraction (XRD), Differential scanning calorimetry (DSC), and attenuated total reflectance-Fourier transform IR spectroscopy (ATR-FTIR) were conducted to study the influence of the encapsulation on the characteristic of resveratrol-loaded NLC, and the results showed that there was no impact on resveratrol-loaded NLC. Chitosan hydrogel beads could significantly improve the phys. stability of resveratrol-loaded NLC. In vitro release study revealed that resveratrol-loaded NLC-Chitosan hydrogel beads had a more significant sustained-release effect on resveratrol. In vitro transdermal studies suggested that the skin permeation of resveratrol was promoted by the effect of Chitosan hydrogel beads and increased resveratrol distribution in the skin. In vitro cytotoxicity showed that resveratrol-loaded NLC-Chitosan hydrogel beads did not exert a hazardous effect on L929 cells. Hence, NLC-Chitosan hydrogel beads might be a promising method for topical applications of resveratrol. This study involved multiple reactions and reactants, such as Glyceryl monostearate (cas: 31566-31-1Related Products of 31566-31-1).

Glyceryl monostearate (cas: 31566-31-1) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Related Products of 31566-31-1

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

Bioinspired nanoemulsions stabilized by phosphoethanolamine and phosphoglycerol lipids was written by Caianiello, Carlo;D’Avino, Marcellino;Cavasso, Domenico;Paduano, Luigi;D’Errico, Gerardino. And the article was included in Nanomaterials in 2020.Application In Synthesis of (2R,9Z)-1-(((2-Aminoethoxy)(hydroxy)phosphoryl)oxy)-3-(palmitoyloxy)propan-2-yl oleate The following contents are mentioned in the article:

Water-in-oil (W/O) nanoemulsions stabilized by phospholipids (PLs) are increasingly exploited in a wide spectrum of applications, from pharmaceuticals to food and cosmetic formulations. In this work, we report the design and optimization of an innovative emulsion based on a mixture of phosphoethanolamine (PE) and phosphoglycerol (PG) PLs, inspired by the composition of the inner leaflet of a bacterial outer membrane. Using the natural oil squalene as the continuous organic phase, no addnl. emulsion stabilizer is needed. On the other hand, a small amount of Span 80 is required when dodecane is used. The obtained nanoemulsions are stable for at least two hours, thus allowing the droplet size and distribution to be characterized by Dynamic Light Scattering (DLS) and the lipid layer structure and dynamics to be analyzed by ESR (EPR) spectroscopy. The results indicate that squalene shallowly intercalates among the lipid tail termini, being unable to deeply penetrate the adsorbed lipid monolayer. The altered lipid dynamics are proposed to be the reason for the enhanced emulsion stability, this paving the way to future implementations and possible applications. This study involved multiple reactions and reactants, such as (2R,9Z)-1-(((2-Aminoethoxy)(hydroxy)phosphoryl)oxy)-3-(palmitoyloxy)propan-2-yl oleate (cas: 26662-94-2Application In Synthesis of (2R,9Z)-1-(((2-Aminoethoxy)(hydroxy)phosphoryl)oxy)-3-(palmitoyloxy)propan-2-yl oleate).

(2R,9Z)-1-(((2-Aminoethoxy)(hydroxy)phosphoryl)oxy)-3-(palmitoyloxy)propan-2-yl oleate (cas: 26662-94-2) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Application In Synthesis of (2R,9Z)-1-(((2-Aminoethoxy)(hydroxy)phosphoryl)oxy)-3-(palmitoyloxy)propan-2-yl oleate

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

Identification and characterization of key aroma compounds in Chinese high altitude and northernmost black tea (Camellia sinensis) using distillation extraction and sensory analysis methods was written by Chen, Xiaohua;Sun, Haiyan;Qu, Dong;Yan, Fei;Jin, Wengang;Jiang, Hai;Chen, Chen;Zhang, Yifan;Li, Chongyong;Xu, Zhimin. And the article was included in Flavour and Fragrance Journal in 2020.COA of Formula: C8H16O2 The following contents are mentioned in the article:

The studied Chinese northernmost black tea made of the tea leaves harvested at high altitude and low climatic temperature location and special tea manufacturing process presented strong honey-like, moderated green/grass and weak floral and fruity aromas. Its aroma was significantly different from other black tea. The key compounds responsible for these aromas were identified and quantified by gas chromatog.-mass spectrometry (GC-MS), gas chromatog.-olfactometry (GC-O), aroma extract dilution anal. (AEDA), aroma reconstitution and exclusion experiments methods. A total of fifty-eight aroma compounds were found in the black tea. Among them, phenylacetaldehyde, E-2-hexenal, E,E-2,4-nonadienal, 2-methylbutanoic acid Et ester, β-ionone, linalool, α-ionone and geraniol were mainly responsible for the black tea aroma. They offered honey-like, floral, green/grassy, violet-like and fruity aromas in the tea infusion. Although E,Z-2,6-nonadienal was one of the major volatile compounds, its unique cucumber-like odor was not perceived in the tea fusion. The special growing location and processing for the tea leaves may contribute to the unique aroma of the black tea. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0COA of Formula: C8H16O2).

Methyl heptanoate (cas: 106-73-0) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.COA of Formula: C8H16O2

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