Tag: 100-200

New insights from flavoromics on different heating methods of traditional fermented shrimp paste: The volatile components and metabolic pathways was written by Lu, Kuan;Liu, Lin;Zi, Jiwei;Song, Lin;Xie, Wancui. And the article was included in LWT–Food Science and Technology in 2022.Application In Synthesis of (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate This article mentions the following:

Traditional Chinese fermented shrimp paste is popular with consumers for its unique seafood flavor and fermented aroma. However, different heating methods exerted various flavors, which directly affect consumer choice and the industrialization of shrimp paste. In this study, the effect of four heating methods (steaming, frying, microwaving, and IR) on volatile components of shrimp paste were compared by headspace solid-phase microextraction-gas chromatog.-mass spectrometry (HS-SPME-GC-MS), gas chromatog.-ion mobility spectrometry (GC-IMS) and chemometrics. Results showed that 96 volatile components were identified; The volatile components such as pentanal, Et acetate, di-Me disulfide, and propanal were the characteristic volatile components that could be distinguished between different heating methods. The concentration of phenols and alcs. decreased, and the concentration of ketones and aldehydes increased after heating. The effect of microwave heating on volatile components is closer to that of steaming and frying, while IR heating had the most significant impact on volatile components of shrimp paste. In addition, steaming, frying, microwaving, and IR heating improve the aroma quality of shrimp paste by promoting fat oxidation, protein degradation, the Strecker pathway, and the escape of sulfur-containing compounds Therefore, our results can provide theor. support for improving shrimp paste quality and consumer choice. 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. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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 In Synthesis of (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate

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

Synergistic Catalysis for the Umpolung Trifluoromethylthiolation of Tertiary Ethers was written by Xu, Wentao;Ma, Junyang;Yuan, Xiang-Ai;Dai, Jie;Xie, Jin;Zhu, Chengjian. And the article was included in Angewandte Chemie, International Edition in 2018.COA of Formula: C7H8O2S This article mentions the following:

The first transition-metal-free, site-specific umpolung trifluoromethylthiolation of tertiary alkyl ethers has been developed, achieving the challenging tertiary C(sp³)-SCF₃ coupling under redox-neutral conditions. The synergism of organophotocatalyst 4CzIPN and BINOL-based phosphorothiols can site-selectively cleave tertiary sp³ C(sp³)-O ether bonds in complex mols. initiated by a polarity-matching hydrogen-atom-transfer (HAT) event. The incorporation of several competing benzylic and methine C(sp³)-H bonds in alkyl ethers has little influence on the regioselectivity. Selective difluoromethylthiolation of C-O bonds has also been achieved. This represents not only an important step forward in trifluoromethylthiolation but also a promising means for site-selective C-O bond functionalization of unsym. tertiary alkyl ethers. In the experiment, the researchers used many compounds, for example, Methyl 2-thienylacetate (cas: 19432-68-9COA of Formula: C7H8O2S).

Methyl 2-thienylacetate (cas: 19432-68-9) 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. 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.COA of Formula: C7H8O2S

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

Bio-augmented effect of Bacillus amyloliquefaciens and Candida versatilis on microbial community and flavor metabolites during Chinese horse bean-chili-paste fermentation was written by Lu, Yunhao;Yang, Linzi;Yang, Guohua;Chi, Yuanlong;He, Qiang. And the article was included in International Journal of Food Microbiology in 2021.Electric Literature of C10H18O2 This article mentions the following:

Chinese horse bean-chili-paste (CHCP), a fermented condiment in China, is traditionally manufactured through naturally spontaneous semi-solid fermentation procedures without intentionally inoculated microorganisms. The aim of this study was to investigate the effect on microbiota and quality variations during CHCP fermentation by inoculation of selected autochthonous microorganisms Bacillus amyloliquefaciens and Candida versatilis. The results showed that relative abundance of Bacillus in the samples inoculated with B. amyloliquefaciens were increased from about 0.6% to almost 25%, and the batches bio-augmented with C. versatilis exhibited clearly 0.7 Lg copies/g higher biomass than that of the other samples. By bio-augmentation, six enzyme activities, namely acid protease, leucine aminopeptidase, α-amylase, cellulose, β-glucosidase and esterase, were considerably enhanced. As a result, inoculation of these two strains exhibited significant effect on the volatile profiles of CHCP. B. amyloliquefaciens herein was found to contribute mainly to the accumulation of acids, sulfur-containing compounds and pyrazines, whereas C. versatilis was considerably associated with the formation of alcs., esters and phenols. This study proved that combination of B. amyloliquefaciens and C. versatilis could obtain more extensive aroma profiles, especially for the enrichment of miso-like and fruity flavors, which could provide a guideline for the tailored control of CHCP fermentation process. In the experiment, the researchers used many compounds, for example, 5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9Electric Literature of C10H18O2).

5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9) 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 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.Electric Literature of C10H18O2

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

Palladium catalyzed reactions of unsaturated carbohydrates. A route to C-glycosides was written by Engelbrecht, Gerhardus J.;Holzapfel, Cedric W.. And the article was included in Heterocycles in 1991.Formula: C10H14O4 This article mentions the following:

Glycosyl carbonates e.g., I, are excellent substrates for palladium catalyzed stereoselective C-glycosidations with active methylene compounds giving the C-glycosides in good yields under mild conditions. Thus, I was treated with NaMeC(CO₂Et)₂ in the presence of Pd(PPh₃)₄-PPh₃ to give >70% the C-glycoside II. In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Formula: C10H14O4).

Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) 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. 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.Formula: C10H14O4

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

Manganese and rhenium-catalyzed selective reduction of esters to aldehydes with hydrosilanes was written by Wei, Duo;Buhaibeh, Ruqaya;Canac, Yves;Sortais, Jean-Baptiste. And the article was included in Chemical Communications (Cambridge, United Kingdom) in 2020.Electric Literature of C10H11FO2 This article mentions the following:

The selective reduction of esters RC(O)OR¹ [R = (4-chlorophenyl)methyl, naphthalen-2-ylmethyl, nonyl, etc.; R¹ = Me, Et] to aldehydes RC(O)H (I), via the formation of stable alkyl silyl acetals RCH(OSi(C₂H₅)₃)OR¹ (II), for the first time, was achieved with both manganese, -Mn₂(CO)₁₀– and rhenium -Re₂(CO)₁₀– catalysts in the presence of triethylsilane as reductant. These two methods provide a direct access to a large variety of aliphatic and aromatic alkyl silyl acetals II and to the corresponding aldehydes I upon hydrolysis. The reactions proceeded in excellent yields and high selectivity at room temperature under photo-irradiation conditions (LED, 365 nm, 40 W, 9 h). In the experiment, the researchers used many compounds, for example, Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2Electric Literature of C10H11FO2).

Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2) 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. 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.Electric Literature of C10H11FO2

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

GC-MS analyses of volatile compounds of steamed breads fermented by Chinese traditional starter “Jiaozi” from different regions was written by Wang, Yuan-Hui;Zhao, Jing-Wen;Xu, Fei;Zhang, Qi-Dong;Ai, Zhi-Lu;Li, Bo-Yu. And the article was included in Journal of Food Processing and Preservation in 2021.SDS of cas: 695-06-7 This article mentions the following:

The volatile compounds of Jiaozi-steamed breads (JSBs) fermented by Jiaozi starters from eight regions in China were extracted using simultaneous distillation and extraction (SDE) and headspace solid-phase microextraction and determined using gas chromatog.-mass spectrometry (GC-MS). 1-Hexanol, 3-methyl-1-butanol, phenylethyl alc., benzaldehyde, naphthalene, ethanol, acetic acid, and n-hexadecanoic acid were the main volatiles of JSBs. Principal component anal. exhibited that the volatiles of JSBs from Nanyang City, Xi’an City, and Zhumadian City was neg. correlated to that of other five JSB samples. Cluster anal. demonstrated that the volatile characteristics of JSBs from Heze City, Minqin County, Taian City, Weinan City, and Yuncheng City belonged to a category, and the JSBs of Nanyang City, Xi’an City, and Zhumadian City were different from other five JSBs. It demonstrated that the volatile components of steamed breads in North China and South China were different. From this study, it can be seen that simultaneous distillation and extraction (SDE) can completely extract volatile compositions of steamed breads fermented by Chinese traditional starter “Jiaozi” SDE/GC-MS was suitable for the anal. of JSBs volatile composition The relative contents of 1-hexanol, 3-methyl-1-butanol, phenylethyl alc., benzaldehyde, naphthalene, ethanol, acetic acid, and n-hexadecanoic acid in JSBs were at high level, and their contents could be used as a marker to identify JSBs. The volatile compositions of JSBs made of Jiaozi starters from Heze City, Minqin County, Taian City, Weinan City, and Yuncheng City were similar. However, JSBs of Nanyang City, Xi’an City, and Zhumadian City were different from other five JSBs. The volatile components of steamed breads in North China and South China were different, which reflected the difference in dietary habit in the southern and northern areas of China. 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 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. 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: 695-06-7

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

A Novel Base-Solvent Controlled Chemoselective Azide Attack on an Ester Group versus Keto in Alkyl 3-Substituted 3-Oxopropanoates: Mechanistic Insights was written by Pokhodylo, Nazariy T.;Shyyka, Olga Ya.;Matiychuk, Vasyl S.;Obushak, Mykola D.;Pavlyuk, Volodymyr V.. And the article was included in ChemistrySelect in 2017.Recommanded Product: Ethyl 3-oxo-3-(thiophen-2-yl)propanoate This article mentions the following:

During the exploration of arylazides reactions with alkyl 3-substituted-3-oxopropanoates under the Dimroth reaction conditions (MeONa-MeOH) azide attack on ester group vs. keto was found out in few examples yielding stable 3-alkyl-2-diazo-3-oxo-N-(aryl)propanamides instead of obvious target 1-aryl-5-alkyl-1H-1,2,3-triazole-4-carboxylic acids. The formation of diazo compounds was observed in case of 3-(4,4-diethoxymethyl)-, isopropyl-, cyclopropyl-3-oxopropanoate in the reaction with arylazides, especially, those containing electron-withdrawing substituents. Influence of the base-solvent system on yields of diazo products was investigated and mechanistic insights of Dimroth reaction were discussed. 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. 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 3-oxo-3-(thiophen-2-yl)propanoate

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

Biocatalysed reduction of carboxylic acids to primary alcohols in aqueous medium: A novel synthetic capability of the zygomycete fungus Syncephalastrum racemosum was written by Brenna, Elisabetta;Cannavale, Flavia;Crotti, Michele;Parmeggiani, Fabio;Romagnolo, Alice;Spina, Federica;Varese, Giovanna Cristina. And the article was included in Journal of Molecular Catalysis B: Enzymatic in 2015.COA of Formula: C7H8O2S This article mentions the following:

The zygomycete fungus Syncephalastrum racemosum shows the remarkable capability of reducing carboxylic acids to primary alcs. in water medium, at ambient temperature and pressure. The reaction does not require mol. hydrogen, and in most cases affords quant. transformations. The results herein reported highlight the basic mol. scaffold that can be accepted by the fungus, the effects due to substituents, and also the possibility that carboxylic acids can be generated in the reaction medium by enzymic hydrolysis of the corresponding Me esters. This biocatalyzed reduction implements the scarcely supplied enzymic toolbox for the conversion of carboxylic groups into primary alcs., which can be exploited for the optimization of sustainable synthetic procedures. In the experiment, the researchers used many compounds, for example, Methyl 2-thienylacetate (cas: 19432-68-9COA of Formula: C7H8O2S).

Methyl 2-thienylacetate (cas: 19432-68-9) 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. 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.COA of Formula: C7H8O2S

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

Analysis of volatile compounds, produced in a glucose solution fermented by Saccharomyces bayanus, during fermentation and conservation of fermented solution. 1. Neutral fraction was written by Chung, Sook-Hyun. And the article was included in Han’guk Yongyang Siklyong Hakhoechi in 1995.Category: esters-buliding-blocks This article mentions the following:

Twenty esters, 14 alcs., 5 aldehydes, 5 ketones, 5 lactones, 2 S-containing compounds and 1 hydrocarbon are identified by GC-MS from volatile compounds in a glucose solution containing Yeast-Carbon-Base medium fermented for 64 h by Saccharomyces bayanus at pH 3.5, 25°, 400rpm and 35L/h of aeration for 24h. Under the different conditions of conservation (1∼4), Et 2-hydroxy-4-methylpentanoate, Et succinate, nonanol and phenylacetaldehyde are produced during conservation of fermented solution 17 Esters increased during conservation at 13° for 12 wk and the increase of Et 9-hexadecenoate is important among 13 esters increased during conservation at 35° for 24h. During conservation, aldehydes increased at 35°, but decreased at 13° and the great increase of isobutanal, benzaldehyde and phenylacetaldehyde is observed at 35°. Alc. and lactones increased but ketones decreased during conservation. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0Category: esters-buliding-blocks).

Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0) 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. 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.Category: esters-buliding-blocks

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

Synthesis of substituted indole-3-carboxylates by iron(II)-catalyzed domino isomerization of 3-alkyl/aryl-4-aryl-5-methoxyisoxazoles was written by Bodunov, Vladimir A.;Galenko, Ekaterina E.;Galenko, Alexey V.;Novikov, Mikhail S.;Khlebnikov, Alexander F.. And the article was included in Synthesis in 2018.Category: esters-buliding-blocks This article mentions the following:

The iron(II)-catalyzed domino isomerization of 3-alkyl/aryl-4-arylisoxazoles provided a selective access to a wide range of structurally diverse highly substituted indole-3-carboxylates such as I [R = H, 6-Me, 4-MeO, etc.; R¹ = Me, 4-ClC₆H₄, 2-naphthyl, etc.; R² = Me, pyrrolidin-1-yl]. The operational simplicity, high atom efficiency and the use of stable starting materials and an inexpensive and low-toxicity catalyst were some of the attractive features of this tandem double ring-opening-ring-closure strategy. In the experiment, the researchers used many compounds, for example, Methyl 2-thienylacetate (cas: 19432-68-9Category: esters-buliding-blocks).

Methyl 2-thienylacetate (cas: 19432-68-9) 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.Category: esters-buliding-blocks

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