Month: December 2022

Study on chemical compositions and antimicrobial activity of the volatile oil of Dictyophora echinovalvata was written by Tan, Dongfei;Wu, Ruojing;Liang, Ming;Lin, Yuexin. And the article was included in Junwu Xitong in 2002.Recommanded Product: (E)-Dodeca-9,11-dien-1-yl acetate The following contents are mentioned in the article:

The volatile oil of Dictyophora echinovalvata was extracted by water-steaming method with ether as extractant and the extraction rate was 0.45%. The chem. compositions of the volatile oil had been separated and identified by means of Gas Chromatog.-Mass Spectrometry. Twenty nine compositions were identified from 36 separated peaks, and the major components were oxacyclotetradecan-2-one, 13-methyl- (23.53%), 9,12-octadecadienoic acid (Z,Z)- (17.56%), selinene (12.37%), hexadecanoic acid (8.20%), 9-hexadecenoic acid (7.84%), (-)-lepidozenal (7.82%), etc., which were made up to 97.76% of the quantity of volatile oil. The antimicrobial activity of the volatile oil was preliminarily tested in the suspensions of Escherichia coli, Staphylococcus aureus, Saccharomyces cerevisiae, Candida albicans, Aspergillus niger, Penicillium chrysogenum and Rhizopus nigricans, resp., when the volatile oil was diluted by 100 times, 50 times and 25 times. The results showed that P. chrysogenum and S. cerevisiae were the most sensitive, next R. nigricans and A. niger, and then C. albicans, S. aureus and E. coli. This study involved multiple reactions and reactants, such as (E)-Dodeca-9,11-dien-1-yl acetate (cas: 50767-78-7Recommanded Product: (E)-Dodeca-9,11-dien-1-yl acetate).

(E)-Dodeca-9,11-dien-1-yl acetate (cas: 50767-78-7) 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. Polyesters are important plastics, with monomers linked by ester moieties. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Recommanded Product: (E)-Dodeca-9,11-dien-1-yl acetate

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

Lactic acid fermentation by cells immobilized on various porous cellulosic materials and their alginate/poly-lactic acid composites was written by Kumar, Mrinal Nishant;Gialleli, Angelika-Ioanna;Masson, Jean Bernard;Kandylis, Panagiotis;Bekatorou, Argyro;Koutinas, Athanasios A.;Kanellaki, Maria. And the article was included in Bioresource Technology in 2014.SDS of cas: 1731-94-8 The following contents are mentioned in the article:

Porous delignified cellulose (or tubular cellulose, abbr. TC) from Indian Mango (Mangifera indica) and Sal (Shorea robusta) wood and Rice husk, and TC/Ca-alginate/polylactic acid composites, were used as Lactobacillus bulgaricus immobilization carriers leading to improvements in lactic acid fermentation of cheese whey and synthetic lactose media, compared to free cells. Specifically, shorter fermentation rates, higher lactic acid yields (g/g sugar utilized) and productivities (g/L d), and higher amounts of volatile byproducts were achieved, while no significant differences were observed on the performance of the different immobilized biocatalysts. The proposed biocatalysts are of food grade purity, cheap and easy to prepare, and they are attractive for bioprocess development based on immobilized cells. Such composite biocatalysts may be used for the co-immobilization of different microorganisms or enzymes (in sep. layers of the biocatalyst), to efficiently conduct different types of fermentations in the same bioreactor, avoiding inhibition problems of chem. or biol. (competition) nature. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8SDS of cas: 1731-94-8).

Methyl nonadecanoate (cas: 1731-94-8) 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. 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. SDS of cas: 1731-94-8

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

Characterization of acrylic copolymers applied in negative-type photoresist via a ternary composition diagram was written by Lee, Chih-Kang;Don, Trong-Ming;Lin, Dar-Jong;Chen, Chin-Chung;Cheng, Liao-Ping. And the article was included in Journal of Applied Polymer Science in 2008.Safety of Ethyl 3-ethoxypropanoate The following contents are mentioned in the article:

Three-component acrylic copolymers used as a binder for neg.-type photoresists were synthesized and characterized. First, free radical polymerization was employed to synthesize two-component binders, i.e., acrylic ester copolymers with different ratios of benzyl methacrylate (BZMA) and methacrylic acid (MAA). Thermal behavior, viscosity and mol. weight of the prepared two-component binders were studied. Then, a series of three-component binders were prepared through incorporation of another monomer, 2-hydroxyethyl methacrylate (2-HEMA). FTIR was used to examine the evolution of chem. bonds at various stages of the synthetic process. Thermal analyses, TGA and DSC, were used to evaluate the level of enhancement on thermal stabilities of the prepared three-component binders. Finally, an optimal region in the ternary composition diagram of BZMA, MAA, and 2-HEMA can be identified by comparing the results of acid value, viscosity, and mol. weight of the binder. A neg.-type photoresist was prepared using an optimized composition, for which resolution of the circuit could reach the level of 6 μm. This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9Safety of Ethyl 3-ethoxypropanoate).

Ethyl 3-ethoxypropanoate (cas: 763-69-9) 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. Safety of Ethyl 3-ethoxypropanoate

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

A new Bronsted acid MIL-101(Cr) catalyst by tandem post-functionalization; synthesis and its catalytic application was written by Mortazavi, Saeideh-Sadat;Abbasi, Alireza;Masteri-Farahani, Majid. And the article was included in Applied Organometallic Chemistry in 2020.Related Products of 112-14-1 The following contents are mentioned in the article:

A new heterogeneous Bronsted solid acid catalyst was prepared by tandem post-functionalization of MIL-101(Cr) and utilized for acetic acid esterification and alcoholysis of epoxides under solvent-free conditions. First, MIL-101(Cr) was functionalized with pyrazine to achieve MIL-101(Cr)-Pyz. Afterwards, the nucleophilic reaction of MIL-101(Cr)-Pyz with 1,3-propane sultone and next acidification with diluted sulfuric acid gave MIL-101(Cr)-Pyz-RSO₃H Bronsted solid acid catalyst. Various characterization methods such as Fourier transformation IR (FT-IR) spectroscopy, X-ray diffraction (XRD), elemental anal. (CHNS), XPS, SEM (SEM), energy-dispersive X-ray (EDX) spectroscopy, thermal anal. (TGA/DTA), acid-base titration, and N₂ adsorption/desorption anal. were employed to fully characterize the prepared catalyst. The catalyst showed high activity compared to unmodified MIL-101(Cr) in both catalytic acetic acid esterification and alcoholysis of epoxides. It can also be readily isolated from the reaction mixture and reused three times without major decrease in its activity. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Related Products of 112-14-1).

Octyl acetate (cas: 112-14-1) 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. Polyesters are important plastics, with monomers linked by ester moieties. 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. Related Products of 112-14-1

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

Thermal and Mechanical Properties of Triazole Cross-Linked Glycidyl Azide (GAP) and Azido Polycarbonate Networks was written by St-Charles, Jean-Christophe;Dubois, Charles. And the article was included in Propellants, Explosives, Pyrotechnics in 2020.Related Products of 102-09-0 The following contents are mentioned in the article:

Triazole cross-linked energetic polymer networks obtained from the reaction of dialkyne curing agents with glycidyl azide polymers (GAP) or poly(2,2-[bisazidomethyl]propane-1,3-diyl carbonate) (poly[BAMPC]) were studied, and their thermal and mech. properties are reported. The dialkynes studied include bis(propargyl)ether (BPE), bis(propargyl)malonate (BPM), and 4,4â€?diacyanohepta-1,6-diyne (DCHD), three compounds previously described as curing agents for glycidyl azide pre-polymers. The cured polymer networks display a wide range of properties dependent on the nature of the azido pre-polymer, the nature of the dialkyne, the alkyne/azide molar ratio, and the mol. weight of the pre-polymer used. Results confirm that the three dialkynes are effective curing agents able to form rigid networks out of either pre-polymer and that the lighter mol. weight BPE and DCHD both improve mech. properties of cured networks with less dilution of the system′s energetic content. Triazole cross-linked poly(BAMPC) networks were studied for the first time, and promising phys. and mech. properties are reported. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Related Products of 102-09-0).

Diphenyl carbonate (cas: 102-09-0) 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. Related Products of 102-09-0

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

Systematic screening of bifunctional ionic liquid for intensifying esterification of methyl heptanoate in the reactive extraction process was written by Wang, Ruizhuan;Chen, Guzhong;Qin, Hao;Cheng, Hongye;Chen, Lifang;Qi, Zhiwen. And the article was included in Chemical Engineering Science in 2021.Safety of Methyl heptanoate The following contents are mentioned in the article:

For long-chain ester formation, reactive extraction intensified by a bifunctional solvent is a proper process concept as the product ester is usually not soluble in water. To screen a bifunctional ionic liquid (IL), both extraction performance and catalytic activity are considered, taking esterification of methanol and heptanoic acid as example. Based on solute-in-IL infinite dilution activity coefficient generated from DNN-based recommender system, infinite dilution selectivity between product and reactant in ILs is adopted to evaluate extraction performance. The acid dissociation constant (pKa) obtained by quantum chem. calculation is used to evaluate the catalytic activity of ILs. The screened IL, 1-propyl-2,3-dimethylimidazol-3-ium hydrogen sulfate ([IM-3,1,1][HSO₄]), has a high infinite dilution selectivity of 710.77 and pKa of 5.81. Both UNIFAC-IL calculation and exptl. validation are performed to examine phase splitting and reaction results. The screened IL gives higher ester yield and ester phase purity than the most commonly used bifunctional IL [BMIM][HSO₄]. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Safety of Methyl heptanoate).

Methyl heptanoate (cas: 106-73-0) 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. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Safety of Methyl heptanoate

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

Correlation of the abbe number, the refractive index, and glass transition temperature to the degree of polymerization of norbornane in polycarbonate polymers was written by Kato, Noriyuki;Ikeda, Shinya;Hirakawa, Manabu;Ito, Hiroshi. And the article was included in Polymers (Basel, Switzerland) in 2020.COA of Formula: C13H10O3 The following contents are mentioned in the article:

The influences of the average d.p. (D_p), which is derived from Mn and terminal end group, on optical and thermal properties of various refractive indexed transparent polymers were investigated. In this study, we selected the alicyclic compound, Dinorbornane dimethanol (DNDM) homo polymer, because it has been used as a representative monomer in low refractive index polymers for its unique properties. DNDM monomer has a stable amorphous phase and reacts like a polymer. Its unique reaction allows continuous investigation from monomer to polymer. For hydroxy end group and phenolic end group polymers, the refractive index (n_d) decreased with increasing D_p, and both converged to same value in the high D_p region. However, the Abbe number (ν_d) of a hydroxy end group polymer is not dependent on D_p, and the νvd of a phenolic end group polymer is greatly dependent on D_p. As for glass transition temperatures (T_g), both end group series were increased as D_p increased, and both converged to the same value. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0COA of Formula: C13H10O3).

Diphenyl carbonate (cas: 102-09-0) 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. 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.COA of Formula: C13H10O3

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

Vintage analysis of Chinese Baijiu by GC and ¹H NMR combined with multivariable analysis was written by Li, Yicong;Fan, Shuangxi;Li, Anjun;Liu, Guoying;Lu, Wei;Yang, Bo;Wang, Fengxian;Zhang, Xin;Gao, Xiaojuan;Lu, Zhiyuan;Su, Ning;Wang, Guanghao;Liu, Yinuo;Ji, Xin;Xin, Peng;Li, Guohui;Wang, Daobing;Lu, Fuping;Zhong, Qiding. And the article was included in Food Chemistry in 2021.Electric Literature of C11H22O2 The following contents are mentioned in the article:

Economical-driven counterfeit and inferior aged Chinese Baijiu has caused serious concern of publicity in China. In this study, a total of 167 authentic Chinese Baijiu samples with different vintages including 3 flavor types were carefully collected. Gas chromatog. (GC) was used to determine main volatile components and proton NMR (1H NMR) spectroscopy was employed to obtain non-targeted fingerprints of Chinese Baijiu samples. Partial least squares regression (PLSR) models, which were confirmed by internal and external validation, were established for effectively identifying actual storage vintage of Chinese Baijiu with various brands, flavor types. Centering (Ctr), pareto scaling (Par), unit variance scaling (UV) data pretreatment methods, principal components (PCs), and three modified variable selection methods were proposed to successfully optimize the vintage model and effectively extract important vintage characteristic factors. This study demonstrated that NMR and GC combined with multivariate statistical anal. are effective tools for validating vintage authenticity of Chinese Baijiu. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Electric Literature of C11H22O2).

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. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Electric Literature of C11H22O2

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

Dynamics in nutrients, sterols and total flavonoid content during processing of the edible Long-Horned grasshopper (Ruspolia differens Serville) for food was written by Ochieng, Brian O.;Anyango, Joseph O.;Nduko, John M.;Cheseto, Xavier;Mudalungu, Cynthia M.;Khamis, Fathiya M.;Ghemoh, Changeh J.;Egonyu, Peter J.;Subramanian, Sevgan;Nakimbugwe, Dorothy;Ssepuuya, Geoffrey;Tanga, Chrysantus M.. And the article was included in Food Chemistry in 2022.HPLC of Formula: 1731-94-8 The following contents are mentioned in the article:

Long-horned grasshopper (Ruspolia differens Serville) is a tasty delicacy in over 20 African countries. This study evaluated the impact of diverse post-harvest thermal treatment (blanching, boiling, toasting, and deep-frying) on the nutrients, total flavonoid content and sterols preservation of R. differens products. Crude protein, ash, and fiber of R. differens was drastically reduced by deep-frying technique. There was increase in Omega-3 (α-linolenic acid), Omega-6 fatty acid (linoleic and arachidonic acids) and sterols [(22Z)-27-Norergosta-5,22-dien-3β-ol, cholesterol, campesterol, cholest-4-ene-3-one and β-sitosterol] and flavonoids (2-3 folds) during blanching compared to other techniques. The iron and zinc content increased significantly in blanched and boiled products of R. differens. Thus, losses of nutrients, total flavonoid content and sterols during processing of R. differens for food can be mitigated by employing blanching technique, which is cheaper and least time-consuming. The implications of these dietary and therapeutic compounds on human nutrition and health are discussed. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8HPLC of Formula: 1731-94-8).

Methyl nonadecanoate (cas: 1731-94-8) 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.HPLC of Formula: 1731-94-8

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

Analysis of fermentation rule and aromatic composition of olive wine fermented with different species of yeast strains was written by Jiang, Yi-ming;Li, Ji-tao;Wu, Xue-ying;Shu, Jun-xia;Cheng, Li-ping;Jiang, He-ti. And the article was included in Shipin Gongye Keji in 2014.Electric Literature of C15H22O2 The following contents are mentioned in the article:

Using olive as raw materials, the variations of alc. degree, reducing sugar and total acidity were tracked during the whole fermentation of olive wines fermented with three different species of yeast strains. The aromatic compositions of olive wines were extracted The results showed that alc. degree increased gradually, reducing sugar decreased gradually and total acidity increased then decreased during the whole fermentation process fermented with three different species of yeast strains. The fermentation cycle of alc. active dry yeast was shortest. In the olive wine fermented with Saccharomyces cerevisia 1383, alc. degree was highest, reducing sugar was least and total acidity was least. And 50, 49 and 52 kinds of aromatic compounds were identified in olive wines fermented with the Saccharomyces cerevisia 1383, alc. active dry yeast and Saccharomyces cerevisia 1596, resp., and 35 kinds of aromatic compounds were same in the there olive wines. The main aromatic compositions were isopentanol. It was initially identified that olive wine fermented with the Saccharomyces cerevisia 1383 was best. This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Electric Literature of C15H22O2).

2-Ethylhexyl benzoate (cas: 5444-75-7) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. 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.Electric Literature of C15H22O2

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