Month: December 2022

Esterification of Microwave Induced Pyrolytic Oil from Sago Bark Waste was written by Wahi, Rafeah;Yahaya, Syamila Aimi;Lam, Su Shiung;Abdul Aziz, Sharifah Mona;Ngaini, Zainab. And the article was included in Waste and Biomass Valorization in 2020.Reference of 1731-94-8 The following contents are mentioned in the article:

In this study, microwave induced pyrolytic oil from sago bark (SB) was subjected to esterification to improve its properties. Improvement on properties of the pyrolytic oil was performed via esterification with ethanol and the presence of sulfuric acid as a catalyst. The optimum esterification condition was studied using general factorial design. The esterified oil (EO) showed improved properties with pH (4-6), reduced moisture content (2.95-3.45%), d. (0.9-1.1 g cm^-3), and acid value (39.3-123.4 mg KOH^-1 g^-1), and maintained the CV (20.2-21.6 MJ kg^-1). GC-MS anal. showed that EO was sulfur free, and low in carboxylic acid and oxygenated compounds The optimal esterification condition with optimum quality of EO was at 65°C temperature, 60 min reaction time and 1:1 ethanol to oil volume ratio. Results indicated that the EO can be potentially used in robust combustion engines upon properties refinement. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8Reference of 1731-94-8).

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

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

Comparison of methods of external and internal standard for GC determination of docosahexaenoic acid was written by Ivanova, Stefka Achkova;Tsvetkova, Dobrina Doncheva;Obreshkova, Danka Petrova. And the article was included in Bulletin of Pharmaceutical Research in 2018.SDS of cas: 1731-94-8 The following contents are mentioned in the article:

Present study includes the comparison of methods of external and internal standard for the estimation of parameters like linearity and precision in gas chromatog. anal. of docosahexaenoic acid (DHA) with flame ionization detector at temperature 140°C – 280°C and using hydrogen as gas carrier. Linear dependence of the ratio of area of methylated DHA/area of Me nonadecanoate (internal standard) to the DHA concentration was obtained. There was no observed difference between the correlation coefficients for two methods (R² = 0.9928). From the exptl. results, it is obvious that related standard deviation (RSD) for internal standard method is more than RSD for external standard method, which demonstrates that nonadecanoic acid is not a suitable internal standard The external standard method allows achievement of good linearity and precision and is appropriate for identification and determination of DHA and fatty acids in food supplements. 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 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 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.SDS of cas: 1731-94-8

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

UV spectrophotometry in drug control. Part 29: Newer drugs with benzene chromophores in the molecule; part 4: Effects of substitution and solvents was written by Kracmar, Josef;Kracmarova, J.. And the article was included in Pharmazie in 1983.Electric Literature of C17H15NO5 The following contents are mentioned in the article:

UV spectra are given for DL-ibuprofen  [15687-27-1] and mexiletine-HCl  [5370-01-4], baclofen  [1134-47-0], lorcainide-HCl  [58934-46-6], clonidine-HCl  [4205-91-8], and ketoconazole  [65277-42-1], DL-terbutalin sulfate  [23031-32-5], and propafenone-HCl  [34183-22-7], xipamide  [14293-44-8], and benorilate  [5003-48-5] in various solvents. Data on maximum and min. wavelengths, absorptivity (1%, 1 cm), and optimum concentration range for determination of the drugs are tabulated. Solvent effects on hyperchromic, bathochromic, hypochromic, and hypsochromic shifts in the spectra of ibuprofen, baclofen, ketoconazole, and xipamide are discussed. This study involved multiple reactions and reactants, such as 4-Acetamidophenyl 2-acetoxybenzoate (cas: 5003-48-5Electric Literature of C17H15NO5).

4-Acetamidophenyl 2-acetoxybenzoate (cas: 5003-48-5) 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. Electric Literature of C17H15NO5

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

Discovery of Roblitinib (FGF401) as a Reversible-Covalent Inhibitor of the Kinase Activity of Fibroblast Growth Factor Receptor 4 was written by Fairhurst, Robin A.;Knoepfel, Thomas;Buschmann, Nicole;Leblanc, Catherine;Mah, Robert;Todorov, Milen;Nimsgern, Pierre;Ripoche, Sebastien;Niklaus, Michel;Warin, Nicolas;Luu, Van Huy;Madoerin, Mario;Wirth, Jasmin;Graus-Porta, Diana;Weiss, Andreas;Kiffe, Michael;Wartmann, Markus;Kinyamu-Akunda, Jacqueline;Sterker, Dario;Stamm, Christelle;Adler, Flavia;Buhles, Alexandra;Schadt, Heiko;Couttet, Philippe;Blank, Jutta;Galuba, Inga;Trappe, Jorg;Voshol, Johannes;Ostermann, Nils;Zou, Chao;Berghausen, Jorg;Del Rio Espinola, Alberto;Jahnke, Wolfgang;Furet, Pascal. And the article was included in Journal of Medicinal Chemistry in 2020.Category: esters-buliding-blocks The following contents are mentioned in the article:

FGF19 signaling through the FGFR4/β-klotho receptor complex has been shown to be a key driver of growth and survival in a subset of hepatocellular carcinomas, making selective FGFR4 inhibition an attractive treatment opportunity. A kinome-wide sequence alignment highlighted a poorly conserved cysteine residue within the FGFR4 ATP-binding site at position 552, two positions beyond the gate-keeper residue. Several strategies for targeting this cysteine to identify FGFR4 selective inhibitor starting points are summarized which made use of both rational and unbiased screening approaches. The optimization of a 2-formylquinoline amide hit series is described in which the aldehyde makes a hemithioacetal reversible-covalent interaction with cysteine 552. Key challenges addressed during the optimization are improving the FGFR4 potency, metabolic stability, and solubility leading ultimately to the highly selective first-in-class clin. candidate roblitinib. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Category: esters-buliding-blocks).

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. 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.Category: esters-buliding-blocks

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

Anionic ring-opening polymerization behavior of trans-cyclohexene carbonate using metal tert-butoxides: Construction of living anionic ring-opening polymerization by lithium tert-butoxide was written by Kawamoto, Masato;Mori, Yasuyuki;Tsuge, Akihiko;Endo, Takeshi. And the article was included in Journal of Polymer Science (Hoboken, NJ, United States) in 2022.Recommanded Product: 102-09-0 The following contents are mentioned in the article:

Anionic ring-opening polymerization (ROP) behavior of trans-cyclohexene carbonate (CHC) using metal alkoxides as initiators was investigated. As a result, lithium tert-butoxide-initiated ROP of CHC with a high-monomer concentration (10 M) at low temperature (-15 to -10°C) proceeded to afford a poly(trans-cyclohexene carbonate) (PCHC) without undesired side reactions such as mainly backbiting. The suppression of side reactions enables the control of the mol. weight (M_n = 2400-6100) of PCHC with low molar-mass dispersity values (M_w/M_n = 1.16-1.22). Furthermore, by increasing the feed ratio of the monomer to the initiator, the mol. weight increases proportionally, indicating a controllable polymerization The results of a matrix-assisted laser desorption/ionization time-of-flight mass spectrometry anal., a kinetic study, and a chain extension experiment suggested a living nature of this ROP using lithium tert-butoxide. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Recommanded Product: 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, including apples, durians, pears, bananas, pineapples, and strawberries. 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. Recommanded Product: 102-09-0

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

Solid state ¹³C NMR characterization study on fourth generation Ziegler-Natta catalysts was written by Heikkinen, Harri;Liitiae, Tiina;Virkkunen, Ville;Leinonen, Timo;Helaja, Tuulamari;Denifl, Peter. And the article was included in Solid State Nuclear Magnetic Resonance in 2012.Related Products of 5444-75-7 The following contents are mentioned in the article:

In this study, solid-state ¹³C NMR spectroscopy was utilized to characterize and identify the metal-ester coordination in active fourth-generation (phthalate) Ziegler-Natta (ZN) catalysts. It is known that different donors affect the active species in ZN catalysts. However, there is still limited data available of detailed mol. information on how the donors and the active species are interacting. One of the main goals of this work was to get better insight into the interactions of donor and active species. Based on the anisotropy tensor values (δ₁₁, δ₂₂, δ₃₃) from low magic-angle spinning ¹³C NMR spectra in combination with chem. shift anisotropy calculations (δ _aniso and η), both the coordinative metal (Mg/Ti) and the symmetry of this interaction between metal and the internal donor in the active catalyst (MgCl₂/TiCl₄/electron donor) system could be identified. This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Related Products of 5444-75-7).

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. 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.Related Products of 5444-75-7

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

Fast filtration with a vacuum manifold system as a rapid and robust metabolome sampling method for Saccharomyces cerevisiae was written by Yun, Eun Ju;Seo, Seung-Oh;Kwak, Suryang;Oh, Eun Joong;Lee, Sun-Hee;Jin, Yong-Su;Kim, Kyoung Heon. And the article was included in Process Biochemistry (Oxford, United Kingdom) in 2021.Product Details of 31566-31-1 The following contents are mentioned in the article:

For metabolome sample preparation, rapid quenching of cellular metabolism without severe loss of intracellular metabolites is important. Here, we comparatively evaluated the two sampling methods, cold methanol quenching and fast filtration, for one of the most important industrial microorganisms, yeast Saccharomyces cerevisiae. The latter, using a vacuum manifold system capable of processing up to twenty samples simultaneously, was developed here. The results showed that the cold methanol quenching method resulted in severe losses of intracellular metabolites but that sugars and sugar phosphates were highly preserved. In comparison, the fast filtration method better preserved most metabolites with less extracellular contamination. Our results suggested that the fast filtration method with a vacuum manifold system can be widely applied to yeast metabolome anal. due to its simplicity, robustness, and lack of significant intracellular metabolite loss. This study involved multiple reactions and reactants, such as Glyceryl monostearate (cas: 31566-31-1Product Details 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. 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.Product Details of 31566-31-1

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

Chitosan film containing antifungal agent-loaded SLNs for the treatment of candidiasis using a Box-Behnken design was written by Kraisit, Pakorn;Yonemochi, Etsuo;Furuishi, Takayuki;Mahadlek, Jongjan;Limmatvapirat, Sontaya. And the article was included in Carbohydrate Polymers in 2022.COA of Formula: C21H44O5 The following contents are mentioned in the article:

The aim of this study was to combine fluconazole (FZ)-loaded solid lipid nanoparticles (FZ-SLNs) and chitosan films (C-films) for the potential administration of FZ across the buccal mucosa using a Box-Behnken design. The chitosan films containing FZ-SLNs (C-FS-films) and C-films were prepared using a film casting method. The ATR-FTIR anal. confirmed the presence of hydrogen bonds between the NH⁺₃ groups of chitosan and the OH or COO^– groups of glyceryl monostearate in the films. Addnl., FESEM anal. of the morphol. of C-FS-films revealed the presence of FZ-SLNs in the films. Permeation studies using porcine buccal mucosa demonstrated that FZ from the C-FS-films was more permeable than in C-films. The antifungal activity of the C-FS-films was evaluated against Candida albicans, and inhibition zones were observed Thus, C-FS-films represent an exciting drug carrier for the treatment of candidiasis via the buccal mucosa. This study involved multiple reactions and reactants, such as Glyceryl monostearate (cas: 31566-31-1COA of Formula: C21H44O5).

Glyceryl monostearate (cas: 31566-31-1) 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. 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.COA of Formula: C21H44O5

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

Foliar nitrogen application from veraison to preharvest improved flavonoids, fatty acids and aliphatic volatiles composition in grapes and wines was written by Cheng, Xianghan;Ma, Tingting;Wang, Panpan;Liang, Yanying;Zhang, Junxiang;Zhang, Ang;Chen, Qianyi;Li, Wanping;Ge, Qian;Sun, Xiangyu;Fang, Yulin. And the article was included in Food Research International in 2020.Product Details of 2198-61-0 The following contents are mentioned in the article:

This study investigated the effects of foliar nitrogen application from veraison to preharvest (FNVH) on flavonoids, fatty acids and aliphatic volatiles in Cabernet Sauvignon grapes and wines. Solutions with 69 and 138 mg N/plant phenylalanine (P1 and P2, resp.), 69 and 138 mg N/plant urea (U1 and U2, resp.), as well as an aqueous solution without nitrogen (CK), were sprayed three times from veraison to preharvest. U1, P1 had the highest anthocyanins and acylated anthocyanins contents in grapes, resp. U1 and P2 showed great potential to promote the accumulation of flavonols and flavanols in grapes and wines. U2 increased the contents of almost all free aliphatic volatiles in grapes, while it didn’t affect the undesirable smell, and increased the concentrations of fruity esters in wines instead. The study showed FNVH was a useful fertilization way for improving contents of flavonoids and fruity aroma in grapes and wines in deficit-nitrogen vineyards. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Product Details of 2198-61-0).

Isopentyl hexanoate (cas: 2198-61-0) 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. Product Details of 2198-61-0

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

Correlation analysis of physicochemical indexes with lipid oxidation characteristics during manufacturing process of fermented cantonese sausages was written by Huang, Jinzhi;Yang, Rongling;Tang, Daobang;Liu, Xueming. And the article was included in Shipin Kexue (Beijing, China) in 2015.Formula: C20H40O2 The following contents are mentioned in the article:

The acid value (AV) and peroxide value (POV), triobarbituric acid (TBA) value, carbonyl value, total acidity, moisture content, free fatty acid and fat during the production process of fermented Cantonese sausages were determined and their correlations were analyzed. The results showed that the AV, POV, TBA and carbonyl value increased as the production process proceeded. The contents of saturated fatty acids and free fatty acids were enhanced during the whole roasting process while the content of unsaturated fatty acids declined from 8 h onwards, which may be due to the continuous oxidation and hydrolysis of fat during the manufacturing process. In addition, pos. correlations among acid value, peroxide value, TBA, carbonyl value, total acid, moisture and fat content were observed POV was significantly correlated with total acidity. Therefore, rancidity degree and the degree of fat oxidation showed consistent trends during the manufacturing process. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8Formula: C20H40O2).

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. 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.Formula: C20H40O2

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