Tag: 100-200

The effect of saliva on the aroma release of esters in simulated baijiu under the impact of high ethanol concentration was written by Chen, Lu;Wang, Zhe;Liao, Pengfei;Li, Anjun;Zhang, Yanyan;Li, Hehe;Sun, Jinyuan. And the article was included in Journal of Food Composition and Analysis in 2021.SDS of cas: 2198-61-0 The following contents are mentioned in the article:

As one of the most popular traditional spirits in China, baijiu has a unique food matrix with high ethanol concentration and a wealth of aroma compounds The aroma profile volatilized from the cup that has been widely studied may be different from the aroma that consumers perceived during drinking. It is affected by numerous factors, and saliva is a critical one. This study revealed that ex-vivo saliva had a significant pos. or neg. influence on ester release in simulated solutions, and proved that the degree of effects was related to the hydrophobicity of the compounds Moreover, the ethanol concentration of simulated baijiu could alter the effect of saliva on esters. Both the effect intensity and the result would be changed, and the performance of the esters was related to their log P-value. Then we examined the underlying mechanism between saliva components and esters under the effect of diverse ethanol concentrations in simulated baijiu solutions with diverse buffers. The high ethanol concentration of baijiu may make the impact of saliva components on the ester release changeable and different from other food matrixes because of the chem. and biol. change in this system. 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 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. 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.SDS of cas: 2198-61-0

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

Amphiphilic block copolymer PCL-PEG-PCL as stationary phase for capillary gas chromatographic separations was written by Sun, Tao;Shuai, Xiaomin;Ren, Kaixin;Jiang, Xingxing;Chen, Yujie;Zhao, Xinyu;Song, Qianqian;Hu, Shaoqiang;Cai, Zhiqiang. And the article was included in Molecules in 2019.Product Details of 106-73-0 The following contents are mentioned in the article:

This work presents the first example of utilization of amphiphilic block copolymer PCL-PEG-PCL as a stationary phase for capillary gas chromatog. (GC) separations The PCL-PEG-PCL capillary column fabricated by static coating provides a high column efficiency of 3951 plates/m for n-dodecane at 120 °C. McReynolds constants and Abraham system constants were also determined in order to evaluate the polarity and possible mol. interactions of the PCL-PEG-PCL stationary phase. Its selectivity and resolving capability were investigated by using a complex mixture covering analytes of diverse types and positional, structural, and cis-/trans-isomers. Impressively, it exhibits high resolution performance for aliphatic and aromatic isomers with diverse polarity, including those critical isomers such as butanol, dichlorobenzene, dimethylnaphthalene, xylenol, dichlorobenzaldehyde, and toluidine. Moreover, it was applied for the determination of isomer impurities in real samples, suggesting its potential for practical use. The superior separation performance demonstrates the potential of PCL-PEG-PCL and related block copolymers as stationary phases in GC and other separation technologies. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Product Details of 106-73-0).

Methyl heptanoate (cas: 106-73-0) 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. 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.Product Details of 106-73-0

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

Comparative study of the volatile organic compounds of four strawberry cultivars and it relation to alcohol acyltransferase enzymatic activity was written by Parra-Palma, Carolina;Ubeda, Cristina;Gil, Mariona;Ramos, Patricio;Castro, Ricardo I.;Morales-Quintana, Luis. And the article was included in Scientia Horticulturae (Amsterdam, Netherlands) in 2019.Reference of 112-14-1 The following contents are mentioned in the article:

Strawberry is one of the most popular fruits in the world because of its good organoleptic characteristics, as its aroma is a complex characteristic that significantly contributes to fruit quality. In the present work, we performed a comparative study of the differences in the volatile organic compounds (VOCs) contents and the enzymic activity and gene expression of alc. acyltransferases (AATs) in four strawberry (Fragaria x ananassa Duch.) cultivars (Camarosa, Cristal,Monterey and Portola). In the four cultivars esters were the most important group among the observed VOCs; however in terms of differences in concentration, the Monterey and Portola cultivars showed the highest ester concentrations, while Cristal showed the lowest, and Camarosa showed an intermediate concentration With respect to the mRNAs of the genes encoding two enzymes (SAAT and FaAAT2), we observed higher transcript levels in the Monterrey and Portola cultivars than in the other two cultivars (Cristal and Camarosa). Finally, the results suggested a temporal relationship exists between total AAT activities, VOCs contents and mRNA gene expression, which could be valuable for future breeding activities. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Reference of 112-14-1).

Octyl acetate (cas: 112-14-1) 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, including apples, durians, pears, bananas, pineapples, and strawberries. 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 112-14-1

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

The potential correlation between microbial communities and flavors in traditional fermented sour meat was written by Zhong, Aiai;Chen, Wei;Duan, Yufan;Li, Ke;Tang, Xingyu;Tian, Xing;Wu, Zhongqin;Li, Zongjun;Wang, Yuanliang;Wang, Chuanhua. And the article was included in LWT–Food Science and Technology in 2021.Name: Isopentyl hexanoate The following contents are mentioned in the article:

Sour meat is widely consumed because of its unique flavor. However, the microbial community′s structure, the flavor production pathways, and the relationship between microbes and flavors resulting from sour meat fermentation processes remain unclear. In this study, high-throughput sequencing technol. and solid-phase microextraction-gas chromatog.-mass spectrometry were used to analyze the structural composition of microbial communities and changes in volatile flavor substances during the fermentation of sour meat. A total of 124 volatile components and 17 free amino acids were detected throughout the fermentation process, of which Et decanoate, Et butyrate, Et lactate, and other Et substances were among the 21 volatile compounds that underwent significant changes. There was also a small number of acids, alcs., and aldehydes. Lactobacillus, Weissella, Staphylococcus, Kodamaea, Hyphopichia, and Yarrowia were the core microorganisms in fermented sour meat. These dominant microorganisms correlated with the changes in most flavor substances. This study provides a theor. basis for revealing the flavor formation mechanisms in sour meat and the screening of functional strains. 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. 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.Name: Isopentyl hexanoate

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

Preparation of yogurt-flavored bases by mixed lactic acid bacteria with the addition of lipase was written by Huang, Yan-yan;Yu, Jia-jia;Zhou, Qin-yu;Sun, Li-na;Liu, Dong-mei;Liang, Ming-hua. And the article was included in LWT–Food Science and Technology in 2020.Category: esters-buliding-blocks The following contents are mentioned in the article:

Yogurt-flavored bases are widely used in food industry for enhancing flavors. In this study, yogurt-flavored bases by mixed lactic acid bacteria with or without lipase were investigated, which included Streptococcus lactis ACCC 11093 (SL) and Lactobacillus casei subsp. rhamnosus 6013 (LCR), SL and Lactobacillus acidophilus 1.1878 (LAP), and SL and Lactobacillus plantarum DMDL 9010 (LP), resp. Compared with the combination of SL and LCR and the combination of SL and LAP, the combination of SL and LP had higher production of total amino acids, volatile acids and esters, suggesting that the combination of SL and LP was more efficient to produce yogurt-flavored bases. In addition, lipase significantly increased the production of amino acids associated with sweet and bitter flavors, and resulted in rougher milk globule surface and tighter network structure compared with fermentations without the addition of lipase. Furthermore, a total of 54 volatile compounds were detected in yogurt-flavored bases. The production of volatile compounds in fermentations with and without the addition of lipase, was mainly affected by acids and esters, resp. Therefore, the lipase is a favorable supplement for producing yogurt-flavored bases. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Category: esters-buliding-blocks).

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. 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.Category: esters-buliding-blocks

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

Biosynthesis of Cu/KF/Clinoptilolite@MWCNTs nanocomposite and its application as a recyclable nanocatalyst for the synthesis of new Schiff base of benzoxazine derivatives and reduction of organic pollutants was written by Hamedani, Naghmeh Faal;Hargalani, Fariba Zamani;Rostami-Charati, Faramarz. And the article was included in Molecular Diversity in 2022.Electric Literature of C4H7NS The following contents are mentioned in the article:

A new Schiff base of benzoxazine derivativesI (R = ethoxycarbonyl, CN; R¹ = i-Pr, Ph, Bn, etc.; R² = Me, Et; R³ = H, OMe, Me, OH; R⁴ = H, Me) in excellent yields using multicomponent reactions of phthalaldehyde or its derivatives2-CHO3-R³-5-R⁴-C₆H₂CHO primary amines RCH₂NH₂, isothiocyanates R¹N=C=S, 2,4-dihydroxyacetophenone, isopropenylacetylene and Me or Et amine in the presence of catalytic amount of Cu/KF/CP@MWCNTs NCs in water at room temperature were synthesized. Also, the catalytic activity of the green synthesized Cu/KF/CP@MWCNTs NCs was evaluated in the reduction in organic pollutants such as 4-nitrophenol (4-NP) in water at mild conditions. The results indicated that the biosynthesized NCs have very high and effective catalytic activity for organic pollutants within few seconds. As well the antioxidant activity of some synthesized benzoxazine was studied using trapping of radical by DPPH and ferric reduction activity potential (FRAP) experiment The short time of reaction, high yields of product, easy separation of catalyst and products are some benefits of this procedure. This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8Electric Literature of C4H7NS).

Isopropylisothiocyanate (cas: 2253-73-8) 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. 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.Electric Literature of C4H7NS

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

Biosynthesis of Cu/KF/Clinoptilolite@MWCNTs nanocomposite and its application as a recyclable nanocatalyst for the synthesis of new Schiff base of benzoxazine derivatives and reduction of organic pollutants was written by Hamedani, Naghmeh Faal;Hargalani, Fariba Zamani;Rostami-Charati, Faramarz. And the article was included in Molecular Diversity in 2022.SDS of cas: 2253-73-8 The following contents are mentioned in the article:

A new Schiff base of benzoxazine derivativesI (R = ethoxycarbonyl, CN; R¹ = i-Pr, Ph, Bn, etc.; R² = Me, Et; R³ = H, OMe, Me, OH; R⁴ = H, Me) in excellent yields using multicomponent reactions of phthalaldehyde or its derivatives2-CHO3-R³-5-R⁴-C₆H₂CHO primary amines RCH₂NH₂, isothiocyanates R¹N=C=S, 2,4-dihydroxyacetophenone, isopropenylacetylene and Me or Et amine in the presence of catalytic amount of Cu/KF/CP@MWCNTs NCs in water at room temperature were synthesized. Also, the catalytic activity of the green synthesized Cu/KF/CP@MWCNTs NCs was evaluated in the reduction in organic pollutants such as 4-nitrophenol (4-NP) in water at mild conditions. The results indicated that the biosynthesized NCs have very high and effective catalytic activity for organic pollutants within few seconds. As well the antioxidant activity of some synthesized benzoxazine was studied using trapping of radical by DPPH and ferric reduction activity potential (FRAP) experiment The short time of reaction, high yields of product, easy separation of catalyst and products are some benefits of this procedure. This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8SDS of cas: 2253-73-8).

Isopropylisothiocyanate (cas: 2253-73-8) 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: 2253-73-8

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

Molecular modeling of the standard state heat of formation was written by Bagheri, Mehdi;Yerramsetty, Krishna;Gasem, Khaled A. M.;Neely, Brian J.. And the article was included in Energy Conversion and Management in 2013.Formula: C7H14O3 The following contents are mentioned in the article:

The standard heat of formation is a basic thermophys. property required in determining enthalpies of reaction and in thermodn. stability analyses. Further, the enthalpies of formation are important in investigating bond energies, resonance energies and the nature of chem. bonds. Therefore, the development of accurate structure-based estimation methods for large varieties of chem. species is greatly beneficial in enhancing capability in process and product development. In this work, quant. structure-property relationship (QSPR) models were developed for a structurally diverse DIPPR dataset of standard heats of formation comprising 1765 pure compounds involving 82 chem. classes. We have employed both linear and nonlinear QSPR modeling techniques. The linear approach involves the use of constricted binary particle swarm optimization (BPSO) for feature selection and multiple-linear regression. In the nonlinear approach, the optimum network architecture and its associated inputs are identified using a wrapper-based feature selection algorithm combining differential evolution and artificial neural networks. Model predictions for the root-mean-square error of the BPSO and nonlinear approaches were 138 and 97 kJ/mol, resp. This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9Formula: C7H14O3).

Ethyl 3-ethoxypropanoate (cas: 763-69-9) 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.Formula: C7H14O3

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

A superchilling storage-ice glazing (SS-IG) of Atlantic salmon (Salmo salar) sashimi fillets using coating protective layers of Zanthoxylum essential oils (EOs) was written by He, Qi;Li, Ziyin;Yang, Zhao;Zhang, Yangcong;Liu, Jun. And the article was included in Aquaculture in 2020.COA of Formula: C10H20O2 The following contents are mentioned in the article:

Sashimi is a perishable aquatic product. Low temperature offers a promising avenue to preserve sashimi, but traditional frozen methods can hardly avoid the undesirable effects caused by fluids’ freezing. The aim of this work is to establish a superchilling storage-ice glazing (SS-IG) approach using essential oils (EOs) from Zanthoxylum acanthopodium (ZA) and Zanthoxylum simulans (ZS) to preserve sashimi. Different compound of EOs were identified using GC-MS. Twelve main active compositions accounted for 52.85% and 63.19% of the total oils. Fresh salmon sashimi fillets were coated by 0.3% of EOs and stored at (-1 ± 0.2) °C for 25 days. EOs-based ice-glazing layers were formed on the surface of sashimi, while the fluids in sashimi samples still kept at liquid state. As the results, the microstructure and sensory quality of sashimi were maximally maintained. The growth of microbial populations and production of total volatile basic nitrogen (TVB-N) in sashimi were inhibited. The degree of lipid oxidation in sashimi was limited at a low range. The results revealed this SS-IG approach can effectively retain the overall quality of sashimi during storage and will be a promising means for the development of sushi industry. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1COA of Formula: C10H20O2).

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. COA of Formula: C10H20O2

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

Synthesis and biological evaluation of novel 1,3,4-thiadiazole derivatives as possible anticancer agents was written by Cevik, Ulviye Acar;Osmaniye, Derya;Levent, Serkan;Saglik, Begum Nurpelin;Cavusoglu, Betul Kaya;Karaduman, Abdullah Burak;Ozkay, Yusuf;Kaplancikli, Zafer Asim. And the article was included in Acta Pharmaceutica (Warsaw, Poland) in 2020.Name: Isopropylisothiocyanate The following contents are mentioned in the article:

The synthesis of new N-(5-substituted-1,3,4-thiadiazol-2-yl)-2-[(5-(substituted amino)-1,3,4-thiadiazol-2-yl)thio]acetamide derivatives and investigation of their anticancer activities were the aims of this work. All the new compounds′ structures were elucidated by elemental analyses, IR, ¹H NMR, ¹³C NMR and MS spectral data. Anticancer activity studies of the compounds were evaluated against MCF-7 and A549 tumor cell lines. In addition, with the purpose of determining the selectivity of cytotoxic activities, the most active compound was screened against a noncancer NIH3T3 cell line (mouse embryonic fibroblast cells). Among the tested compounds, compound 4y (N-(5-ethyl-1,3,4-thiadiazol-2-yl)-2-((5-(p-tolylamino)-1,3,4-thiadiazol-2-yl)thio)acetamide), showed promising cytotoxic activity against MCF7 cancer cell with an IC₅₀ value of 0.084 ± 0.020 mmol L^-1 and against A549 cancer cell with IC₅₀ value of 0.034 ± 0.008 mmol L^-1, compared with cisplatin. The aromatase inhibitory activity was evaluated for compound 4y on MCF-7 cell line showing promising activity with IC₅₀ of 0.062 ± 0.004 mmol L^-1. This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8Name: Isopropylisothiocyanate).

Isopropylisothiocyanate (cas: 2253-73-8) 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 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.Name: Isopropylisothiocyanate

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