Month: January 2023

Characterization of key odor-active compounds in pure chicken powder and the effect of yeast extract, using instrumental and sensory techniques was written by Shen, Dong-Yu;Li, Meng-Ke;Zhao, Mu;Li, Jie;Cui, Xinyue;Zou, Ting-Ting;Song, Huan-Lu;Xiong, Jian;Li, Ku. And the article was included in Journal of Food Composition and Analysis in 2023.SDS of cas: 695-06-7 This article mentions the following:

Pure chicken powder (PCP) is a reliable source of mellow chicken soup flavor in seasoning, but it has some unstable compounds and is prone to lipid oxidation, which leads to unpleasant odor. Adding yeast extract (YE) can reduce the off-odor intensity of PCP. Based on the results of gas chromatog.-olfactometry-mass spectrometry (GC-O-MS), two-dimensional comprehensive gas chromatog.-olfactometry-mass spectrometry (GCxGC-O-MS) and combined aroma extract dilution anal. (AEDA), 14 key odor-active compounds were identified. Internal standard curve method was used for quant. anal., and the odor activity value (OAV) was calculated Octanal, 1-octen-3-ol and hexanal were found to be the most vital odor-active compounds in PCP. The odor-active compounds of YE were studied by the same method, and di-Me trisulfide was identified as the most important odor-active compound of YE. Addnl., recombination and omission experiments were carried out with PCP. Finally, it was found that a low concentration of di-Me trisulfide had masking effect on the odor of PCP. In the experiment, the researchers used many compounds, for example, 5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7SDS of cas: 695-06-7).

5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7) 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. 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: 695-06-7

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

Remote Cooperative Group Strategy Enables Ligands for Accelerative Asymmetric Gold Catalysis was written by Wang, Zhixun;Nicolini, Corrado;Hervieu, Cedric;Wong, Yuk-Fai;Zanoni, Giuseppe;Zhang, Liming. And the article was included in Journal of the American Chemical Society in 2017.Quality Control of Diethyl 2-(prop-2-yn-1-yl)malonate This article mentions the following:

An accelerative asym. gold catalysis is achieved for the first time via chiral ligand metal cooperation. An asym. positioned remote amide group in the designed chiral binaphthyl-based ligand plays the essential role of a general base catalyst and selectively accelerates the cyclizations of 4-allen-1-ols into one prochiral allene face. The reactions are mostly highly enantioselective with achiral substrates, and due to the accelerated nature of the catalysis catalyst loadings as low as 100 ppm are allowed. With a pre-existing chiral center at any of the backbone sp³-carbons, the reaction remained highly efficient and most importantly maintained excellent allene facial selectivities regardless of the substrate stereochem. By using different combinations of ligand and substrate enantiomers, it is now possible to access all four stereoisomers of versatile 2-vinyltetrahydrofurans with exceedingly high selectivity. The underpinning design of this chem. reveals a novel and conceptually distinctive strategy to tackle challenging asym. gold catalysis, which to date has relied on decelerative asym. steric hindrance approaches. In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Quality Control of 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. 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.Quality Control of Diethyl 2-(prop-2-yn-1-yl)malonate

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

Compositional changes of the floral scent volatile emissions from Asian skunk cabbage (Symplocarpus renifolius, Araceae) over flowering sex phases was written by Oguri, Suguru;Sakamaki, Kensuke;Sakamoto, Hikaru;Kubota, Kikue. And the article was included in Phytochemical Analysis in 2019.Recommanded Product: Isopentyl 3-methylbutanoate This article mentions the following:

Introduction : Flowering of the Asian skunk cabbage (Symplocarpus renifolius, Araceae) shows a sequential expression of female, bisexual and male sex phases. The protogynous thermogenic inflorescence has unpleasant odours, but the contributing chem. composition is poorly understood. Objective : To determine the volatile composition of odor emissions from each S. renifolius flowering phase. Methodol. : The dynamic headspace method was used to collect floral volatiles from six intact S. renifolius inflorescences in their natural habitat. Collected volatiles from the three flowering phases were analyzed using gas chromatog.-mass spectrometry/olfactometry (GC-MS/O). Results : Female-phase inflorescences were characterised by an earthy-rotten-minty odor, while male-phase inflorescences typically exhibited a rotten-oily odor. Approx. 160 compounds were detected in volatiles from the three phases. Common to all phases were 3-methylbutyl 3-methylbutanoate, 1,8-cineole, di-Me disulfide and sabinene, together accounting for 52 to 54% of total volatiles. GC-MS/O revealed that at least 28 volatiles including eight S-containing compounds contributed to the unpleasant odor of S. renifolius. Among them, di-Me disulfide (onion-like), methional (potato-like), and the tentatively identified Me dithioformate (garlic-like) were intense odor-active compounds in each floral phase. Addnl., 2-isopropyl-3-methoxypyrazine (IPMP) was a major contributor to the earthy odor that was characteristic of the female phase. Conclusions : No marked changes were observed in floral volatile compositions over the three flowering phases of S. renifolius. Instead, flower phase-dependent proportional changes of minor components (e.g. IPMP and 2,3-butanedione) altered the odor characteristics between the female and male phases. In the experiment, the researchers used many compounds, for example, Isopentyl 3-methylbutanoate (cas: 659-70-1Recommanded Product: Isopentyl 3-methylbutanoate).

Isopentyl 3-methylbutanoate (cas: 659-70-1) 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. 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: Isopentyl 3-methylbutanoate

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

Making of water soluble curcumin to potentiate conventional antimicrobials by inducing apoptosis-like phenomena among drug-resistant bacteria was written by Yadav, Shivangi;Singh, Ashish Kumar;Agrahari, Anand Kumar;Sharma, Kavyanjali;Singh, Anoop Shyam;Gupta, Munesh Kumar;Tiwari, Vinod Kumar;Prakash, Pradyot. And the article was included in Scientific Reports in 2020.Application In Synthesis of (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate This article mentions the following:

The upsurge of multidrug resistant bacterial infections with declining pipeline of newer antibiotics has made it imperative to develop newer mols. or tailor the existing mols. for more effective antimicrobial therapies. Since antiquity, the use of curcumin, in the form of Curcuma longa paste, to treat infectious lesions is unperturbed despite its grave limitations like instability and aqueous insolubility Here, we utilized “click” chem. to address both the issues along with improvisation of its antibacterial and antibiofilm profile. We show that soluble curcumin disrupts several bacterial cellular processes leading to the Fenton′s chem. mediated increased production of reactive oxygen species and increased membrane permeability of both Gram-pos. and Gram-neg. bacteria. We here report that its ability to induce oxidative stress can be harnessed to potentiate activities of ciprofloxacin, meropenem, and vancomycin. In addition, we demonstrated that the soluble curcumin reported herein even sensitizes resistant Gram-neg. clin. isolates to the Gram-pos. specific antibiotic vancomycin, thereby expanding the antibacterial spectrum of this drug. This work shows that the soluble curcumin can be used to enhance the action of existing antimicrobials against both Gram-pos. and Gram-neg. bacteria thus strengthening the antibiotic arsenal for fighting resistant bacterial infections for many years to come. In the experiment, the researchers used many compounds, for example, (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4Application In Synthesis of (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate).

(2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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.Application In Synthesis of (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate

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

Synthesis of Cyclopentenones through Rhodium-Catalyzed C-H Annulation of Acrylic Acids with Formaldehyde and Malonates was written by Yu, Shuling;Hong, Chao;Liu, Zhanxiang;Zhang, Yuhong. And the article was included in Organic Letters in 2021.Synthetic Route of C11H20O4 This article mentions the following:

An efficient rhodium-catalyzed protocol for the synthesis of cyclopentenones I (R¹ = Et, Bn, c-hexyl, etc.; R² = H, Me, Et, Ph; -R¹R²– = -(CH₂)₃-, -(CH₂)₄-; R³ = Me, Et, n-Pr, i-Pr, n-Bu) based on a three-component reaction of acrylic acids, formaldehyde, and malonates via vinylic C-H activation is reported. Exploratory studies showed that 5-alkylation of as-prepared cyclopentenones could be realized smoothly by the treatment of a variety of alkyl halides with a Na₂CO₃/MeOH solution Excess formaldehyde and malonate led to a multicomponent reaction that afforded the multisubstituted cyclopentenones II (R¹ = n-Bu, 3-FC₆H₄, Ph(CH₂)₂, etc.; R² = H, Me, Et, etc.; R³ = Me, Et, n-Pr, i-Pr; -R¹R²– = -(CH₂)₄-) through a Michael addition In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Synthetic Route of C11H20O4).

malonic acid dibutyl ester (cas: 1190-39-2) 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 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. Synthetic Route of C11H20O4

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

Dancing performance of organic droplets in aqueous surfactant solutions was written by Cejkova, Jitka;Schwarzenberger, Karin;Eckert, Kerstin;Tanaka, Shinpei. And the article was included in Colloids and Surfaces, A: Physicochemical and Engineering Aspects in 2019.Recommanded Product: Ethyl 2-hydroxybenzoate This article mentions the following:

Droplet systems remain the subject of a constant fascination in science and technol. Here we focus on organic droplets floating on the surface of aqueous surfactant solutions These droplets can exhibit intriguing interactions. Recently we have found independently in two laboratories that we can observe almost the same complex collective behavior in two different droplet systems. The aim of this paper is to compare both droplets systems, present their differences and show their similar oscillatory behavior. The first system consists of decanol droplets floating on a sodium decanoate solution In the second one, the droplets consist of a mixture of Et salicylate and liquid paraffin and they are placed on the surface of an aqueous sodium dodecyl sulfate solution Although the mechanism of these spatio-temporal interactions of droplets is not fully understood yet, we believe that this behavior is based on the same phenomena. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Recommanded Product: Ethyl 2-hydroxybenzoate).

Ethyl 2-hydroxybenzoate (cas: 118-61-6) 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: Ethyl 2-hydroxybenzoate

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

New europium coordination polymers with efficient energy transfer from conjugated tetracarboxylate ligands to Eu³⁺ ion: syntheses, structures, luminescence and magnetic properties was written by Wang, Li-Feng;Kang, Ling-Chen;Zhang, Wen-Wei;Wang, Fang-Ming;Ren, Xiao-Ming;Meng, Qing-Jin. And the article was included in Dalton Transactions in 2011.Formula: C12H10O4 This article mentions the following:

Two novel lanthanide coordination polymers, [Eu₂(EBTC)(DMF)₅(NO₃)₂]·DMF (1) and [Eu₂(BBTC)_1.5(CH₃OH)₂(H₂O)₂]·7DMF·HNO₃ (2) (EBTC^4- = 1,1′-ethynebenzene-3,3′,5,5′-tetracarboxylate; BBTC^4- = 1,1′-butadiynebenzene-3,3′,5,5′-tetracarboxylate), were successfully synthesized from conjugated ligands of EBTC^4- and BBTC^4-. Although the two tetracarboxylate ligands have similar structures, their different rigidity/flexibility results in quite different networks upon complexation. Complex 1 has a two-dimensional (2-D) layered structure with two crystallog. independent Eu³⁺ ions, one in a distorted monocapped square-antiprism and the other in a distorted square-antiprism coordination geometry. Complex 2 exhibits a three-dimensional (3-D) porous framework, with one type of Eu³⁺ in a distorted square-antiprism and the other in a trigondodecahedron environment. Both 1 and 2 emit the intensely red characteristic luminescence of Eu³⁺ ion at room temperature, with a long lifetime of up to 1.3 and 0.7 ms, resp., during which the ligand emission of EBTC^4-/BBTC^4- was quenched by the Eu³⁺ ion, indicating the existence of efficient energy transfer between the conjugated ligand of EBTC^4-/BBTC^4- and the Eu³⁺ ion. Thus, both EBTC^4- and BBTC^4- are ideal ligands with an “antenna” effect for the Eu³⁺ ion. The two complexes show the single-ion magnetic behaviors of Eu³⁺ with strong spin-orbit coupling interactions even if there are shorter distances (5.714 Å for 1 vs. 4.275 and 5.360 Å for 2) between the neighboring Eu³⁺ ions connected by oxygen atoms of the tetracarboxylates. In the experiment, the researchers used many compounds, for example, Dimethyl 5-ethynylisophthalate (cas: 313648-56-5Formula: C12H10O4).

Dimethyl 5-ethynylisophthalate (cas: 313648-56-5) 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.Formula: C12H10O4

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

Crown Ether Cavity-Containing Copolymers via Controlled Alternating Cyclocopolymerization was written by Jia, Yong-guang;Liu, Ling-yan;Lei, Bin;Li, Jing;Zhu, X. X.. And the article was included in Macromolecules (Washington, DC, United States) in 2011.Application In Synthesis of Benzyl benzodithioate This article mentions the following:

The cyclocopolymn. of difunctional styrenic flexible monomers with maleic anhydride via reversible addition-fragmentation chain transfer (RAFT) has been investigated. The reaction proceeded to yield gel-free copolymers soluble in organic solvents. The kinetic study indicated that the cyclocopolymn. of difunctional styrenic flexible monomer with maleic anhydride proceeded in a controlled manner. The structures of resulting crown ether cavity-containing copolymers were characterized by the use of NMR spectroscopy and MALDI-TOF mass spectrometry. The crown ether cavities in copolymers exhibited a selective recognition for certain dialkylammonium ions. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Application In Synthesis of Benzyl benzodithioate).

Benzyl benzodithioate (cas: 27249-90-7) 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. 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 Benzyl benzodithioate

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

Comparison of two methods for the collection of volatiles from three legumes was written by Bai, Ze-zhen;Yang, Mei-hong;Zhao, Xiang. And the article was included in Caoyuan Yu Caoping in 2021.Related Products of 695-06-7 This article mentions the following:

Volatiles from three legume species, Medicago ruthenica, black soybean and Glycine soja, were extracted by dynamic headspace extraction and solid-phase microextraction (SPME) to investigate the effects of extraction method on the volatile components. Gas chromatog.-mass spectrometry was used to analyze and identify the main components of volatiles. The results showed that the volatile components (mainly alcs., aldehydes, acids, esters, ketones, terpenes and hydrocarbons) extracted by dynamic headspace extraction were different from those by SPME. There were 33, 18 and 16 components of volatiles extracted by dynamic headspace extraction in M. ruthenica, black soybean and Glycine soja, resp., while the corresponding values extracted by SPME were 24, 24 and 22. Some common chems. were extracted using those two different methods, for example, six chems. (including leaf alc., trans-hex-3-en-1-ol, (E)-β-ocimene, 4-ethylbenzaldehyde, cis-3-hexenyl acetate, hexadecane) in M. ruthenica; three chems. (4-ethylbenzaldehyde, cis-3-hexenyl acetate and cyclohexane) in black soybean; and 4 chems. (4-ethylbenzaldehyde, cis-3-hexenyl acetate, oct-1-en-3-ol and 3-octanol) in Glycine soja. The chems., cis-3-hexenyl acetate and 4-ethylpropiophenone were detected in all those three legume species. The main volatile components extracted by dynamic headspace anal. were esters, while the main components extracted by SPME were alcs. As the dynamic headspace anal. could reflect the near-natural state of plants, it is recommended for the collection of volatiles from plants. This study identified the volatile components of three legume species, which could provide reference for further screening of volatile components in legumes that have attracting activity to insects. In the experiment, the researchers used many compounds, for example, 5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7Related Products of 695-06-7).

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. 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.Related Products of 695-06-7

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

Synthesis of medium-chain carboxylic acids or α,ω-dicarboxylic acids from cellulose-derived platform chemicals was written by Li, Xing-Long;Zhang, Kun;Jiang, Ju-Long;Zhu, Rui;Wu, Wei-Peng;Deng, Jin;Fu, Yao. And the article was included in Green Chemistry in 2018.Application of 106-79-6 This article mentions the following:

Medium-chain fatty acids and their derivatives have important applications in the energy and chem. industries. Thus, a series of medium-chain fatty acids were prepared by the selective hydrodeoxygenation of the aldol condensation products derived from cellulose using a metal triflate and Pd/C catalyst system. The selective retention of the carboxyl group is a notable feature of this catalytic system. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Application of 106-79-6).

Dimethyl decanedioate (cas: 106-79-6) 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. 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.Application of 106-79-6

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