Tag: 100-200

Effects of cooking conditions on the physicochemical and sensory characteristics of dry- and wet-aged beef was written by Lee, Dongheon;Lee, Hyun Jung;Yoon, Ji Won;Ryu, Minkyung;Jo, Cheorun. And the article was included in Animal Bioscience in 2021.Quality Control of 5-Ethyldihydrofuran-2(3H)-one This article mentions the following:

This study aimed to elucidate the effects of cooking conditions on the physicochem. and sensory characteristics of dry- and wet-aged beef strip loins. Dry- and wet-aged beef aged for 28 days were cooked using different cooking methods (grilling or oven roasting) x cooking temperatures (150鎺矯 or 230鎺矯), and their pH, 2-thiobarbituric acid reactive substances (TBARS), volatile compounds, and color were measured. Cooking conditions did not affect pH; however, grilling resulted in lower TBARS but higher cooking doneness at the dry-aged beef surface compared to oven roasting (p< 0.05). In descriptive sensory anal., the roasted flavor of dry-aged beef was significantly stronger when grill-cooked compared to oven roasting. Dry-aged beef grill-cooked at 150鎺矯 presented a higher intensity of cheesy flavor, and that grilled at 230鎺矯 showed a greater intensity of roasted flavor compared to wet-aged beef at the same condition, resp. Grilling may be effective for enhancing the unique flavor in dry-aged beef. In the experiment, the researchers used many compounds, for example, 5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7Quality Control of 5-Ethyldihydrofuran-2(3H)-one).

5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7) 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鎺?C閳ユ弲閳ユ彊 and O閳ユ弲閳ユ彊 angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C閳ユ彊閳ユ弲 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. Quality Control of 5-Ethyldihydrofuran-2(3H)-one

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

Complementing Pyridine-2,6-bis(oxazoline) with Cyclometalated N-Heterocyclic Carbene for Asymmetric Ruthenium Catalysis was written by Li, Long;Han, Feng;Nie, Xin;Hong, Yubiao;Ivlev, Sergei;Meggers, Eric. And the article was included in Angewandte Chemie, International Edition in 2020.Recommanded Product: Ethyl 3-oxo-3-(thiophen-2-yl)propanoate This article mentions the following:

A strategy for expanding the utility of chiral pyridine-2,6-bis(oxazoline) (pybox) ligands for asym. transition metal catalysis is introduced by adding a bidentate ligand to modulate the electronic properties and asym. induction. Specifically, a ruthenium(II) pybox fragment is combined with a cyclometalated N-heterocyclic carbene (NHC) ligand to generate catalysts for enantioselective transition metal nitrenoid chem., including ring contraction to chiral 2H-azirines (up to 97% ee with 2000 TON) and enantioselective C(sp³)-H aminations (up to 97% ee with 50 TON). In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8Recommanded Product: Ethyl 3-oxo-3-(thiophen-2-yl)propanoate).

Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8) 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. Esters contain a carbonyl center, which gives rise to 120鎺?C閳ユ弲閳ユ彊 and O閳ユ弲閳ユ彊 angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C閳ユ彊閳ユ弲 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: Ethyl 3-oxo-3-(thiophen-2-yl)propanoate

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

Electrochemical fluorination of a benzylic position in sulfolane solvent was written by Laurent, Eliane;Marquet, Bernard;Tardivel, Robert. And the article was included in Journal of Fluorine Chemistry in 1990.Safety of Ethyl 2-fluorophenylacetate This article mentions the following:

The use of sulfolane as a solvent instead of MeCN in the electrofluorination of benzylic derivatives, e.g. RC₆H₄CH₂E [R = H, Cl; E = COMe, CO(OEt), CN)], gives greater yields of benzylic fluorides (e.g. RC₆H₄CFHE) because the formation of acetamido byproducts is prevented. However, the parallel fluorination of the aromatic nucleus is not avoided under these conditions. In the experiment, the researchers used many compounds, for example, Ethyl 2-fluorophenylacetate (cas: 584-74-7Safety of Ethyl 2-fluorophenylacetate).

Ethyl 2-fluorophenylacetate (cas: 584-74-7) 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. 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.Safety of Ethyl 2-fluorophenylacetate

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

Changes in Physicochemical Properties and Volatile Compounds of Roselle (Hibiscus sabdariffa L.) Calyx during Different Drying Methods was written by Juhari, Nurul Hanisah;Martens, Helle Jakobe;Petersen, Mikael Agerlin. And the article was included in Molecules in 2021.Category: esters-buliding-blocks This article mentions the following:

Fresh roselle are high in moisture and deteriorate easily, which makes drying important for extending shelf-life and increasing availability. This study investigated the influence of different drying methods (oven-drying, freeze-drying, vacuum-drying, and sun-drying) on the quality of roselle calyx expressed as physicochem. properties (moisture content, water activity, soluble solids, color), volatile compounds, and microstructure. Oven-drying and freeze-drying reduced moisture content most while vacuum-drying and sun-drying were not as efficient. All drying methods except sun-drying resulted in water activities low enough to ensure safety and quality. Vacuum-drying had no impact on color of the dry calyx and only small impact on color of water extract of calyx. Drying reduced terpenes, aldehydes, and esters but increased furans. This is expected to reduce fruity, floral, spicy, and green odors and increase caramel-like aroma. Sun-drying produced more ketones, alcs., and esters. SEM revealed that freeze-drying preserved the cell structure better, and freeze-dried samples resembled fresh samples most compared to other drying techniques. The study concludes that freeze-drying should be considered as a suitable drying method, especially with respect to preservation of structure. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Category: esters-buliding-blocks).

Methyl2-methylbutyrate (cas: 868-57-5) 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鎺?C閳ユ弲閳ユ彊 and O閳ユ弲閳ユ彊 angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C閳ユ彊閳ユ弲 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. Category: esters-buliding-blocks

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

Direct authentication of three Chinese materia medica species of the Lilii Bulbus family in terms of volatile components by headspace-gas chromatography-ion mobility spectrometry was written by Yuan, Zhi-ying;Qu, Hao-yu;Xie, Meng-zhou;Zeng, Guang;Huang, Hui-yong;Ren, Fang;Chen, Nai-hong. And the article was included in Analytical Methods in 2019.Product Details of 868-57-5 This article mentions the following:

Juandan-Baihe (Lilium lancifolium Thunb.), Lanzhou-Baihe (Lilium davidii var. unicolor), and Jin-Baihe (Lilium trompeten) are of the same family, but of different genera. They have often been used in Chinese Materia Medica (CMM) as Lilii Bulbus in the Chinese market. These three species of CMM are often confused, and thus, for better application, they must be accurately identified. Herein we use a headspace-gas chromatog.-ion mobility spectrometry (HS-GC-IMS) technique as a screening system to authenticate the three species of CMM. The obtained ion mobility data were processed using LAV processing software to identify fingerprints and perform principal component anal. (PCA). From the fingerprints, fifty peaks, for 36 compounds, were identified, among which 3-methylbutanal was the most abundant in Lilium lancifolium Thunb. (JD), butanone was the most abundant in Lilium davidii var. unicolor (LZ), and 3-methylbutanoic acid and 2-heptanone were the most abundant in Lilium trompeten (WP). All three species have a characteristic area in the fingerprint containing their characteristic biomarker. The PCA for the initial solution to original variables showed that the two principal components accounted for 53% and 21% of the total variance. This research is aimed at establishing a green, rapid method based on HS-GC-IMS to provide scientific data for discrimination between Lilii Bulbus from different species. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Product Details of 868-57-5).

Methyl2-methylbutyrate (cas: 868-57-5) 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.Product Details of 868-57-5

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

Silver-mediated annulation between 5-H-1,2,3-thiadiazoles and 1,3-dicarbonyl compounds to construct polysubstituted furans was written by Feng, Mengxia;Jiang, Huanfeng;Huang, Liangbin. And the article was included in Organic Chemistry Frontiers.Recommanded Product: 13669-10-8 This article mentions the following:

An efficient synthesis of polysubstituted furans I [R = Ph, furan-2-yl, 4-MeSC₆H₄, etc.; R¹ = Me, i-Pr, Ph, etc.; R² = CN, C(O)Me, C(O)OEt, etc.] by Ag(I)-mediated annulation between 5-H-1,2,3-thiadiazoles and 1,3-dicarbonyl compounds was reported. The methodol. was characterized by availability of starting materials, good functional group tolerance, and the successful construction of heterocycle-substituted furans. The utilization of this method was evidenced by the gram-scale synthesis and further elaboration of the product. In addition, preliminary control experiments ruled out the formation of an alkynyl silver intermediate. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8Recommanded Product: 13669-10-8).

Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8) 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. 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.Recommanded Product: 13669-10-8

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

Combinatorial Discovery of Fluorescent Pharmacophores by Multicomponent Reactions in Droplet Arrays was written by Burchak, Olga N.;Mugherli, Laurent;Ostuni, Mariano;Lacapere, Jean Jacques;Balakirev, Maxim Y.. And the article was included in Journal of the American Chemical Society in 2011.Application In Synthesis of Methyl 2-aminonicotinate This article mentions the following:

Fluorescence imaging in clin. diagnostics and biomedical research relies to a great extent on the use of small organic fluorescent probes. Because of the difficulty of combining fluorescent and mol.-recognition properties, the development of such probes has been severely restricted to a number of well-known fluorescent scaffolds. Here we demonstrate that autofluorescing druglike mols. are a valuable source of bioimaging probes. Combinatorial synthesis and screening of chem. libraries in droplet microarrays allowed the identification of new types of fluorophores. Their concise and clean assembly by a multicomponent reaction presents a unique potential for the one-step synthesis of thousands of structurally diverse fluorescent mols. Because they are based upon a druglike scaffold, these fluorophores retain their mol. recognition potential and can be used to design specific imaging probes. In the experiment, the researchers used many compounds, for example, Methyl 2-aminonicotinate (cas: 14667-47-1Application In Synthesis of Methyl 2-aminonicotinate).

Methyl 2-aminonicotinate (cas: 14667-47-1) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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 In Synthesis of Methyl 2-aminonicotinate

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

Development of ELISAs for the class-specific determination of organophosphorus pesticides was written by Piao, Yuan Zhe;Kim, Yoo Jung;Kim, Young Ah;Lee, Hye-Sung;Hammock, Bruce D.;Lee, Yong Tae. And the article was included in Journal of Agricultural and Food Chemistry in 2009.Application of 28478-46-8 This article mentions the following:

Enzyme-linked immunosorbent assays (ELISAs) for the class-specific determination of organophosphorus (OP) pesticides were developed from monoclonal antibodies raised against haptens with the functional group common to OP pesticides. To develop antigen-coated, indirect, competitive ELISAs, four haptens with different spacer arm structures were used to prepare antibodies, while eight haptens were tested for use as coating antigens. A total of 32 ELISAs were developed with one selected as the most suitable one based on average IC₅₀ and % CV values. The chosen ELISA showed class-selective response to O,O-di-Et phosphorothioate and phosphorodithioate OP pesticides with negligible cross-reactivity to other types of pesticides. Average IC₅₀ and % CV values of this ELISA for the 12 OP pesticides were 89 ng/mL and 96%, resp. Compared to ELISAs previously developed with the same objective, the current ELISA demonstrates better sensitivity based on much lower mean IC₅₀ values in addition to improved class-selective determination based on considerably lower % CV values as well as precise discrimination against other types of pesticides. In the experiment, the researchers used many compounds, for example, Methyl 4-Hydroxy-2-methoxybenzoate (cas: 28478-46-8Application of 28478-46-8).

Methyl 4-Hydroxy-2-methoxybenzoate (cas: 28478-46-8) 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. Esters contain a carbonyl center, which gives rise to 120鎺?C閳ユ弲閳ユ彊 and O閳ユ弲閳ユ彊 angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C閳ユ彊閳ユ弲 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 of 28478-46-8

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

Chiral Phosphoric Acid-Catalyzed Enantio- and Diastereoselective Allylboration of Aldehydes with 灏?绾?Substituted Allylboronates was written by Yuan, Jinping;Jain, Pankaj;Antilla, Jon C.. And the article was included in Journal of Organic Chemistry in 2022.Application In Synthesis of (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate This article mentions the following:

The catalytic asym. addition of 灏?绾?substituted allylboronates to aldehydes was described. Promoted by 5 mol % chiral H₃PO₄, the reactions were broadly applicable, scalable, and efficient, allowing for the formation of 3,4-anti/syn-homoallylic alcs. bearing adjacent tertiary or quaternary stereogenic centers in a highly enantio- and diastereoselective manner (閳?9% ee and dr >20:1). The rigid chair-like transition state involving the chiral H₃PO₄ contributed to the highly controlled reaction. In the experiment, the researchers used many compounds, for example, (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3Application In Synthesis of (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate).

(E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3) 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. 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.Application In Synthesis of (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate

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

1,6-Heptadiynes disubstituted at position 4 by acetyl, ethoxycarbonyl, and nitrile groups was written by Plouin, Dominque;Glenat, Rene. And the article was included in Comptes Rendus des Seances de l’Academie des Sciences, Serie C: Sciences Chimiques in 1972.Recommanded Product: Diethyl 2-(prop-2-yn-1-yl)malonate This article mentions the following:

The title compounds, RR1C(CH2C椤氬挵H)2 (I), were prepared in 84-92% yields by condensing HC椤氬挵CH2Br with CH2RR1 in K2CO3-Me2CO. The formation of minor products, substituted furans, and MeCOCH(CH2C椤氬挵H)2, was discussed. Four I (R = COMe, CO2Et; R1 = COMe, CO2Et, CN) were prepared In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Recommanded Product: Diethyl 2-(prop-2-yn-1-yl)malonate).

Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) 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. 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.Recommanded Product: Diethyl 2-(prop-2-yn-1-yl)malonate

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