Month: December 2022

Monitoring the evolution of volatile compounds using gas chromatography during the stages of production of Moscatel sparkling wine was written by Soares, Rafael Dutra;Welke, Juliane Elisa;Nicolli, Karine Primieri;Zanus, Mauro;Caramao, Elina Bastos;Manfroi, Vitor;Zini, Claudia Alcaraz. And the article was included in Food Chemistry in 2015.Application of 5444-75-7 The following contents are mentioned in the article:

This study reports, for the first time, the main changes that occur with some important aroma compounds of Moscatel sparkling wines during winemaking, measured using headspace solid-phase microextraction, one-dimensional and comprehensive two-dimensional gas chromatog. (GC × GC) with mass spectrometry detection (MS). The best conditions of volatile extraction included the use of PDMS/DVB fiber, 2 mL of wine, 30% of NaCl, 40 °C for 30 min. The chromatog. profile of sparkling wines showed decreasing amounts of monoterpenes (limonene, 4-terpineol, terpinolene, citronellol, α-terpineol, linalool, hotrienol, and nerol oxide), increasing amounts of esters (terpenyl esters, Et octanoate, Et decanoate and hexyl acetate) and alcs. (1-nonanol and 2-phenylethanol). Sixty-nine compounds co-eluted in the first dimension; only six co-eluted in the second dimension. GC × GC/TOFMS allows more detailed study of the volatile profile of sparkling wines. This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Application of 5444-75-7).

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. 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 of 5444-75-7

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

Streamlined Iterative Assembly of Thio-Oligosaccharides by Aqueous S-Glycosylation of Diverse Deoxythio Sugars was written by Wen, Peng;Jia, Peijing;Fan, Qiuhua;McCarty, Bethany J.;Tang, Weiping. And the article was included in ChemSusChem in 2022.Application of 604-69-3 The following contents are mentioned in the article:

A streamlined iterative assembly of thio-oligosaccharides was developed by aqueous glycosylation. Facile syntheses of various deoxythio sugars with the sulfur on different positions from com. available starting materials were described. These syntheses featured efficient chem. methods including our recently reported BTM-catalyzed site-selective acylation. The resulting deoxythio sugars could then be used for the Ca(OH)₂-promoted protecting group-free S-glycosylation in water at room temperature The aqueous glycosylation reaction proceeded smoothly to afford the corresponding 1,2-trans S-glycosides in good yields with high chemo- and stereoselectivity. An appropriate choice of protecting groups for the thiol in the glycosyl donor was necessary for the development of iterative synthesis of thio-oligosaccharides. The aqueous glycosylation was then applied to the synthesis of a trimannoside moiety of N-linked glycans core region. This study involved multiple reactions and reactants, such as (2S,3R,4S,5R,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 604-69-3Application of 604-69-3).

(2S,3R,4S,5R,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 604-69-3) 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 of 604-69-3

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

Aroma profile and phenolic content of merlot red wines produced in high-altitude regions in Brazil was written by Arcari, Stefany Grutzmann;Caliari, Vinicius;Luiz de Souza, Edson;Godoy, Helena Teixeira. And the article was included in Quimica Nova in 2021.Application In Synthesis of Isopentyl hexanoate The following contents are mentioned in the article:

In Brazil, wine-growing regions of high altitude have been evaluated for the cultivation of grapes destined for the production of quality wines. In this study the phenolic content, the volatile compounds profile and the in vitro antioxidant activity of samples produced in Agua Doce, Campos Novos and Tangara were determined using spectrophotometric and chromatog. techniques. A total of 95 volatile compounds were identified in the samples analyzed, of which borneol is reported in Brazilian Merlot wines for the first time. The quant. results showed that the most important volatile compounds for wine aroma were esters, fatty acids, 1-hexanol and 2-phenylethanol alcs., and C13-norisoprenoids β-damascenone and α-ionone. The phenolic content observed was comparable to the results obtained for Merlot red wines from other regions in Brazil and in other countries. Also, the wine samples were effective in capturing the free radicals DPPH and ABTS. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Application In Synthesis of Isopentyl hexanoate).

Isopentyl hexanoate (cas: 2198-61-0) 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 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 Isopentyl hexanoate

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

Tellurolate-induced 1,4-elimination of 1,4-dibromo 2-enes. Syntheses of 1,3-dienes was written by Engman, Lars;Bystroem, Styrbjoern E.. And the article was included in Journal of Organic Chemistry in 1985.Electric Literature of C14H24O2 The following contents are mentioned in the article:

Na 2-thiophenetellurolate (I), generated in catalytic amounts from bis(2-thienyl) ditelluride by NaBH₄, debrominated 1,4-dibromo-2-olefins, e.g., BrCH₂CH:CHCHRBr [II, R = Et, Bu, Me(CH₂)_n, AcO(CH₂)_m; n = 6, 8; m = 7, 8] to 1,3-dienes under mild conditions. The required II were prepared by allylic α,α’-bromination of olefins by N-bromosuccinimide. Terminal olefins yielded, via allylic rearrangement, a mixture of II and 1,2-dibromo-3-olefins. Both isomers were converted to 1,3-dienes (E/Z â‰?9/1) by I. The synthetic utility of the tellurolate-induced debromination was demonstrated in a 2-step synthesis of (E)-CH₂:CHCH:CH(CH₂)₈OAc, the main component of the red bollworm moth sex pheromone. 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 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. Electric Literature of C14H24O2

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

Thymoquinone-loaded chitosan nanoparticles as natural preservative agent in cosmetic products was written by Mondejar-Lopez, Maria;Lopez-Jimenez, Alberto Jose;Martinez, Joaquin C. Garcia;Ahrazem, Oussama;Gomez-Gomez, Lourdes;Niza, Enrique. And the article was included in International Journal of Molecular Sciences in 2022.Recommanded Product: 31566-31-1 The following contents are mentioned in the article:

The current status of controversy regarding the use of certain preservatives in cosmetic products makes it necessary to seek new ecol. alternatives that are free of adverse effects on users. In our study, the natural terpene thymoquinone was encapsulated in chitosan nanoparticles. The nanoparticles were characterized by DLS and TEM, showing a particle size of 20 nm. The chem. structure, thermal properties, and release profile of thymoquinone were evaluated and showed a successful stabilization and sustained release of terpenes. The antimicrobial properties of the nanoparticles were evaluated against typical microbial contaminants found in cosmetic products, showing high antimicrobial properties. Furthermore, natural moisturizing cream inoculated with the aforementioned microorganisms was formulated with thymoquinone-chitosan nanoparticles to evaluate the preservative efficiency, indicating its promising use as a preservative in cosmetics. This study involved multiple reactions and reactants, such as Glyceryl monostearate (cas: 31566-31-1Recommanded Product: 31566-31-1).

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. 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.Recommanded Product: 31566-31-1

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

Different distillation stages Baijiu classification by temperature-programmed headspace-gas chromatography-ion mobility spectrometry and gas chromatography-olfactometry-mass spectrometry combined with chemometric strategies was written by He, Fei;Duan, Jiawen;Zhao, Jiwen;Li, Hehe;Sun, Jinyuan;Huang, Mingquan;Sun, Baoguo. And the article was included in Food Chemistry in 2021.SDS of cas: 2198-61-0 The following contents are mentioned in the article:

Liquid-liquid microextraction (LLME) combined with gas chromatog.-olfactometry-mass spectrometry (GC-O-MS) was used to detect the variations in volatile compounds during the distillation process (head, heart, and tail) of raw Baijiu produced by different layers of fermented grains; 47 aroma compounds were sniffed and identified. Moreover, temperature-programmed headspace gas chromatog.-ion mobility spectrometry (TP-HS-GC-IMS) was applied to characterize the Baijiu distillation process for the first time. The 3D fingerprint spectrum clearly showed a variation in volatile compounds from different distillation stages, and most compounds showed a downward trend. In addition, multivariate statistical anal., including principal component anal. (PCA), partial least squares discriminant anal. (PLS-DA), etc., confirmed ten aroma active markers related to classification, indicating that these markers had a great influence on the flavor of raw Baijiu. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0SDS of cas: 2198-61-0).

Isopentyl hexanoate (cas: 2198-61-0) 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. 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: 2198-61-0

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

Optimization of an intra-oral solid-phase microextraction (SPME) combined with comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry (GC x GC-TOFMS) method for oral aroma compounds monitoring of Baijiu was written by Yu, Yamin;Chen, Shuang;Nie, Yao;Xu, Yan. And the article was included in Food Chemistry in 2022.Name: Isopentyl hexanoate The following contents are mentioned in the article:

The “after-odor” is essential to the quality and consumer preference of Baijiu. An intra-oral solid-phase microextraction (SPME) combined with comprehensive two-dimensional gas chromatog.-time-of-flight mass spectrometry (GC x GC-TOFMS) was developed for oral aroma compounds monitoring of Baijiu. The extraction time, sip volume and rinse time were 120 s, 5 mL, and 10 s, resp. The procedure showed good performances at concentrations of 1.56μg/L-1500 mg/L for different aroma compounds of Baijiu (most R² > 0.9). Furthermore, the optimized procedure detected 85 aroma compounds with different chem. structures and provided good representations of the light, strong, soy sauce and mix aroma type Baijiu’s oral aroma profiles. Principal component anal.’s (PCA) cumulative interpretation rate was 72.42%. The acceptable performance of this procedure can be combined with dynamic sensory evaluation to improve the quality of the Baijiu aroma. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Name: Isopentyl hexanoate).

Isopentyl hexanoate (cas: 2198-61-0) 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.Name: Isopentyl hexanoate

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

Crystallographic Understanding of Photoelectric Properties for C₆₀ Derivatives Applicable as Electron Transporting Materials in Perovskite Solar Cells was written by Xing, Zhou;Li, Shu-Hui;Xu, Piao-Yang;Tian, Han-Rui;Deng, Lin-Long;Yao, Yang-Rong;Chen, Bin-Wen;Xie, Fang-Fang;An, Ming-Wei;Yun, Da-Qin;Xie, Su-Yuan;Zheng, Lan-Sun. And the article was included in Chemical Research in Chinese Universities in 2022.Category: esters-buliding-blocks The following contents are mentioned in the article:

Hundreds of C₆₀ derivatives stand out as electrontransporting materials(ETMs), for example, in perovskite solar cells(PSCs), due to their properties on electron extraction or defect passivation. However, it still lacks of guidelines to update C60-based ETMs with excellent photoelec. properties. In this work, crystallog. data of eight C₆₀-based ETMs, including pristine C₆₀ and the well-known PCBM as well as six newly synthesized fullerenes, are analyzed to establish the connections between derivatized structures and photoelec. properties for the typical carbon cluster of C₆₀. In terms of packing centroid-centroid distance between neighboring carbon cages, the crystallog. data are useful for probing photoelec. properties, such as electrochem. properties, electron mobility and photovoltaic performances, and therefore facilitate to design novel C₆₀-based ETMs for PSCs with high performances. This study involved multiple reactions and reactants, such as Methyl 5-(4-fluorophenyl)-5-oxopentanoate (cas: 149437-67-2Category: esters-buliding-blocks).

Methyl 5-(4-fluorophenyl)-5-oxopentanoate (cas: 149437-67-2) 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, including apples, durians, pears, bananas, pineapples, and strawberries. 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.Category: esters-buliding-blocks

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

Design, synthesis and biological evaluation of carbohydrate-based sulphonamide derivatives as topical antiglaucoma agents through selective inhibition of carbonic anhydrase II was written by Hou, Zhuang;Li, Chuanchao;Liu, Yichuang;Zhang, Miao;Wang, Yitong;Fan, Zhanfang;Guo, Chun;Lin, Bin;Liu, Yang. And the article was included in Journal of Enzyme Inhibition and Medicinal Chemistry in 2020.Category: esters-buliding-blocks The following contents are mentioned in the article:

A series of new carbohydrate-based sulfonamide derivatives were designed, synthesized by employing the so-call ‘sugar-tail’ approach. The compounds were evaluated in vitro against a panel of CAs. Compared to their parent compound p-sulfamoylbenzoic acid, these compounds showed nearly 100-fold improvement in their binding affinities against hCA II in vitro. All of compounds showed great water solubility and the pH value of their water solutions of compounds is 7.0. Such properties are advantageous to make them much less irritating to the eye when applied topical glaucomatous drugs, compared to the relatively highly acidic dorzolamide preparations (pH 5.5). Notably, compounds , , demonstrated to topically lower intraocular pressure (IOP) in glaucomatous animals better than brinzolamide when applied as a 1% solution directly into the eye. Low cytotoxicity on human cornea epithelial cell was observed in the tested concentrations by the MTT assay. This study involved multiple reactions and reactants, such as (2S,3R,4S,5R,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 604-69-3Category: esters-buliding-blocks).

(2S,3R,4S,5R,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 604-69-3) 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. Category: esters-buliding-blocks

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

Comparative investigation of volatile components and bioactive compounds in beers by multivariate analysis was written by Ji, Xiaoyue. And the article was included in Flavour and Fragrance Journal in 2021.Name: Octyl acetate The following contents are mentioned in the article:

The volatile components of nine com. beers were characterized by headspace-solid-phase microextraction (HS-SPME) coupled with gas chromatog.-mass spectrometry (GC-MS). Multivariate anal. was conducted to evaluate the similarities and differences between the volatile components and bioactive compounds present in the target beer samples. Thirty-eight volatile compounds were identified, and their chem. categories were determined Alcs. and esters were determined to be the predominant volatile components in samples. The differences and classifications of the beer samples were analyzed through principal component anal. and cluster anal. The anal. of the volatile compounds in beer samples revealed that the type and content of the volatiles can influence beer quality and taste. The combination of SPME-GC-MS and multivariate statistical anal. proves to be an effective approach for differentiating beer types and for allowing the quality control of beer. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Name: Octyl acetate).

Octyl acetate (cas: 112-14-1) 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. 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.Name: Octyl acetate

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