Tag: 200-300

Identification of Bacillus from Niulanshan Erguotou fermented grain and analysis of flavor compounds in fermentation was written by Yang, Chunxia;Liao, Yonghong;Liu, Junxiong;Hu, Jianhua;Hu, Jiayin;Dou, Shen. And the article was included in Shipin Gongye Keji in 2012.Synthetic Route of C15H22O2 The following contents are mentioned in the article:

Five strains of Bacillus which can produce flavor were screened from Niulanshan Ergoutou fermented grain. Using the sequences anal. of 16S rDNA and phylogenetic tree construction, five strains were identified as Bacillus licheniformis, Bacillus cereus, Bacillus pumilus and Bacillus subtilis. The fermentation broths of five bacillus strains were analyzed by solid phase micro-extraction and chromatog.-mass spectrometry. Removing the compounds of blank, a total of 14 flavor compounds in fermentation broth of Bacillus licheniformis BL-1, 12 flavor compounds in fermentation broth of Bacillus cereus BC-1 and Bacillus pumilus BP-1, 16 flavor compounds in fermentation broth of Bacillus subtilis BS-1, 19 flavor compounds in fermentation broth of Bacillus subtilis BS-2. Except Bacillus pumilus, the fermentation of other four Bacillus strains mainly contained esters compound, and 3-hydroxy-2-butanone was the most important flavor compound However, the fermentation of Bacillus pumilus BP-1 mainly comprised alkynes compound and phenylethyl alc. was the main flavor compound This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Synthetic Route of C15H22O2).

2-Ethylhexyl benzoate (cas: 5444-75-7) 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. 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 C15H22O2

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

Thermo-induced chain scission and oxidation of isosorbide-based polycarbonates: Degradation mechanism and stabilization strategies was written by Yan, Shengdi;Wu, Guozhang. And the article was included in Polymer Degradation and Stability in 2022.Safety of Diphenyl carbonate The following contents are mentioned in the article:

The thermal degradation mechanism and stabilization strategies of isosorbide (ISB)-co-1,4-cyclohexanedimethanol (CHDM) polycarbonate (IcC-PC) and IcC-PC/bisphenol-A polycarbonate (BPA-PC) blends were systematically investigated. IcC-PC is more prone to mol. weight decrease and yellowing than BPA-PC during high-temperature processing. MALDI-TOF-MS and ¹H-NMR anal. results show that ISB-PC and CHDM-PC underwent hydrolysis, β-elimination, and ISB-unit oxidation reactions, in which the former two reactions reduced mol. weight, and the latter induced yellowing. The addition of phosphite antioxidants, which have a strong peroxide removal ability, and free radical scavengers with low steric hindrance can inhibit the hydrolysis and ISB-unit oxidation Accordingly, the thermal stability of IcC-PC is significantly improved. By reducing the reaction time (even if the catalysts loading is increased) and adding antioxidants, the thermal stability of reactive blends can be further improved, and the IcC-PC/BPA-PC transparent alloys close to the PC raw materials were prepared This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Safety of Diphenyl carbonate).

Diphenyl carbonate (cas: 102-09-0) 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, including apples, durians, pears, bananas, pineapples, and strawberries. 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.Safety of Diphenyl carbonate

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

Significant improvements in the characterization of volatile compound profiles in squid using simultaneous distillation-extraction and GC×GC-TOFMS was written by Jin, Yafang;Deng, Yun;Yue, Jin;Zhao, Yanyun;Yu, Wenjuan;Liu, Zhidong;Huang, Hongliang. And the article was included in CyTA–Journal of Food in 2015.Recommanded Product: 5444-75-7 The following contents are mentioned in the article:

The profile of volatiles in squids was characterized using simultaneous distillation-extraction coupled with comprehensive two-dimensional gas chromatog. (GC) and Time-of-Flight mass spectrometry (GC×GC-TOFMS). GC×GC-TOFMS improved the resolution and separation efficiency of the compounds; it not only separated the 52 compounds that co-elute in conventional GC-MS, but also allowed the identification of compounds that were not previously detected (e.g. 2-Octanol). The total contents of volatiles detected by GC×GC-TOFM were about 2.5-fold higher than those analyzed by GC-MS. Among 184 volatiles identified by GC×GC-TOFMS, 119 compounds were reported for the first time in squids, compared with the GC-MS data available in the literature. These volatile classes included aromatic hydrocarbons (39), aliphatic hydrocarbons (22), esters (21), aldehydes (20), alcs. (19), sulfo compounds (18), nitrogenous compounds (17), ketones (14), acids (6), furans (5) and phenols (3). This study proposes a methodol. and presents data that could be used to determine the volatiles in seafood. This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Recommanded Product: 5444-75-7).

2-Ethylhexyl benzoate (cas: 5444-75-7) 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. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Recommanded Product: 5444-75-7

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

The aphid sex pheromone cyclopentanoids: synthesis in the elucidation of structure and biosynthetic pathways was written by Dawson, Glenn W.;Pickett, John a.;Smiley, Diane W. M.. And the article was included in Bioorganic & Medicinal Chemistry in 1996.Synthetic Route of C12H18O3 The following contents are mentioned in the article:

Identification of a range of aphid sex pheromones as comprising the cyclopentanoids (4aS,7S,7aR)-nepetalactone (I), (1R,4aS,7S,7aR)-nepetalactol (II) and the (1S)- and (1R,4aR,7S,7aS)-nepetalactols (III) required samples authenticated by ¹H and ¹³C NMR. These and related compounds were provided by small scale synthesis and extraction from plants in the genus Nepeta (Lamiaceae). The subsequent discovery that the synthetic sex pheromones could attract males, and also parasitic wasps that attack aphids, has created a need for large scale syntheses of the cyclopentanoids. This is afforded by cyclization of the 8-oxo-1-enamine of citronellal as originally developed by Schreiber and co-workers (1986). Investigation into the biosynthesis of the cyclopentanoids by plants for exploiting aphid sex pheromones in crop protection by means of mol. biol. required synthesis of putative biosynthetic intermediates, some with radioactive isotopic labeling, particularly 8-oxidized monoterpene alcs. and aldehydes. This study involved multiple reactions and reactants, such as (2E,6E)-3,7-Dimethyl-8-oxoocta-2,6-dien-1-yl acetate (cas: 37905-02-5Synthetic Route of C12H18O3).

(2E,6E)-3,7-Dimethyl-8-oxoocta-2,6-dien-1-yl acetate (cas: 37905-02-5) 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. Synthetic Route of C12H18O3

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

Overheat diagnosis of power cable based on gas sensors: Device/material exploration was written by Liu, Yang;Geyik, Ugur;Kobald, Arne;Yang, Aijun;Wang, Xiaohua;Weimar, Udo;Rong, Mingzhe;Barsan, N.. And the article was included in Sensors and Actuators, B: Chemical in 2022.Synthetic Route of C15H22O2 The following contents are mentioned in the article:

A review. Monitoring the gas composition around power cables using gas sensors is a promising method for detecting their overheating. In this paper we screened the sensing performance in dry and humid conditions of a variety of com. and homemade sensors. The target gases were 2-Ethylhexanol (2-EH), Dioctyl terephthalate (DOTP), and Benzene; they are the main gases evaporated from overheated polyvinyl chloride (PVC), which is the material of choice for the external insulation of power cables. We found that the tested sensors show different sensing performances to the three target gases, generally with a fast response and slow recovery, the latter especially for 2-EH and DOTP. We also found that the responses to DOTP and 2-EH are correlated and, generally, larger than the ones to benzene. We also showed that by combining the sensors into a sensor array and applying PCA it is possible to distinguish between 2-EH and DOTP, on the one hand, and benzene, on the other hand. However, a more refined pattern recognition method is needed to distinguish between 2-EH and DOTP. This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Synthetic Route of C15H22O2).

2-Ethylhexyl benzoate (cas: 5444-75-7) 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.Synthetic Route of C15H22O2

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

Effect of high hydrostatic pressure and heat sterilization on volatile components in peach juice was written by Xu, Zenghui;Jia, Jianhui;Lu, Xiaolian;Peng, Yijiao;Tian, Xu;Guo, Hong. And the article was included in Shipin Kexue (Beijing, China) in 2012.Formula: C15H22O2 The following contents are mentioned in the article:

In this paper, the effect of high hydrostatic pressure (HHP) and heat sterilization treatments on volatile components in peach juice was investigated. The major volatile components in untreated peach juice were acetic acid, 1-pentanol, 3-methylmethoxy-2-Pr acetate and benzaldehyde. The esters exhibited an increase after HHP treatment, which were acetyl Bu ester and di-Bu phthalate with the content increase by 516.67% and 40.91%, benzaldehyde and nonanal with the content increase by 219.78% and 130.55%. Meanwhile, HHP treatment revealed the occurrence of new compounds such as 3,4-dimethyl-2-hexanone and di-Et phthalate and an obvious loss of alcs. Heat sterilization led to dramatic change of volatile components in peach juice, which exhibited the content decrease of acetyl Bu ester, and complete loss of 1-methoxy-2-Pr acetate, acetic acid, 3-methyl-pentanol and benzyl methanol. However, the increased 2-decen-1-ol (oil flavor) damaged the flavor of peach juice. All of these results indicated that HHP could retain better flavor of peach juice than heat sterilization. This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Formula: C15H22O2).

2-Ethylhexyl benzoate (cas: 5444-75-7) 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. 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. Formula: C15H22O2

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

A Transient Initiator for Polypeptoids Postpolymerization α-Functionalization via Activation of a Thioester Group was written by Borova, Solomiia;Schlutt, Christine;Nickel, Joachim;Luxenhofer, Robert. And the article was included in Macromolecular Chemistry and Physics in 2022.Quality Control of Diphenyl carbonate The following contents are mentioned in the article:

Here, a postpolymn. modification method for an α-terminal functionalized poly-(N-methyl-glycine), also known as polysarcosine, is introduced. 4-(Methylthio)phenyl piperidine-4-carboxylate as an initiator for the ring-opening polymerization of N-methyl-glycine-N-carboxyanhydride followed by oxidation of the thioester group to yield an α-terminal reactive 4-(methylsulfonyl)phenyl piperidine-4-carboxylate polymer is utilized. This represents an activated carboxylic acid terminus, allowing straightforward modification with nucleophiles under mild reaction conditions and provides the possibility to introduce a wide variety of nucleophiles as exemplified using small mols., fluorescent dyes, and model proteins. The new initiator yielded polymers with well-defined molar mass, low dispersity, and high end-group fidelity, as observed by gel permeation chromatog., NMR spectroscopy, and matrix-assisted laser desorption/ionization time-of-flight mass spectroscopy. The introduced method can be of great interest for bioconjugation, but requires optimization, especially for protein conjugation. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Quality Control of Diphenyl carbonate).

Diphenyl carbonate (cas: 102-09-0) 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, including apples, durians, pears, bananas, pineapples, and strawberries. 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.Quality Control of Diphenyl carbonate

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

Corrosion inhibition of carbon steel in HCl solution by aqueous brown onion peel extract was written by Ferreira, K. C. R.;Cordeiro, R. F. B.;Nunes, J. C.;Orofino, H.;Magalhaes, M.;Torres, A. G.;D’Elia, E.. And the article was included in International Journal of Electrochemical Science in 2016.SDS of cas: 5444-75-7 The following contents are mentioned in the article:

The effect of aqueous brown onion peel extract on the corrosion process of carbon steel in 1 mol L-1 HCl was examined The electrochem. results, including the displacement of the corrosion potential and the inhibitory action in both anodic and cathodic polarization curves showed that the examined extract acted as mixed-type inhibitor. The results of the electrochem. impedance measurements showed that the Rct values increased in the presence of inhibitor reaching 94% of inhibition efficiency in the presence of 300 mg L-1 of the extract The inhibition efficiency of C-steel in 1 mol L-1 HCl increased as the temperature increased and the apparent activation energy (Ea) of C-steel dissolution decreased in the presence of the extract, which suggest a strong chemisorptive bond between the components present in the onion extract and the metal surface. The extract anal. showed few volatile compounds with 3(2H)-Furanone, 2-hexyl-5-methyl- as the major volatile compound and a nitrogenous base (5-octadecyl-pyrimidine-2,4,6-trione) which may play an important role in the inhibition process. This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7SDS of cas: 5444-75-7).

2-Ethylhexyl benzoate (cas: 5444-75-7) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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.SDS of cas: 5444-75-7

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

RAFT-polymerized poly(hexafluoroisopropyl methacrylate)s as precursors for functional water-soluble polymers was written by Nuhn, Lutz;Overhoff, Iris;Sperner, Marcel;Kaltenberg, Katrin;Zentel, Rudolf. And the article was included in Polymer Chemistry in 2014.Quality Control of 1,1,1,3,3,3-Hexafluoroisopropylmethacrylate The following contents are mentioned in the article:

Post-polymerization modification of well-defined precursor polymers is a versatile tool to obtain multifunctional water-soluble polymers that cannot be synthesized by common polymerization techniques. For the first time, 1,1,1,3,3,3-hexafluoroisopropyl methacrylate (HFIPMA) based homo and block copolymers were synthesized via RAFT polymerization to provide precise precursors for the post-polymerization modification of the 1,1,1,3,3,3-hexafluoroisopropyl ester side chains with water-soluble amines (methoxy tri(ethylene glycol)amine, 2-hydroxypropylamine and 3-(dimethylamino)-1-propylamine). Sequential aminolysis using Oregon Green cadaverine first, followed by 2-hydroxypropylamine enables access to dye-labeled poly(2-hydroxypropyl methacrylamide) and aminolysis with 3-(dimethylamino)-1-propylamine provides homo and block co-catiomers that complex pDNA in PBS. To this respect, poly(1,1,1,3,3,3-hexafluoroisopropyl methacrylate)s P(HFIPMA)s as precursor polymers may become an alternative route for the synthesis of multifunctional water-soluble polymers for advanced applications. This study involved multiple reactions and reactants, such as 1,1,1,3,3,3-Hexafluoroisopropylmethacrylate (cas: 3063-94-3Quality Control of 1,1,1,3,3,3-Hexafluoroisopropylmethacrylate).

1,1,1,3,3,3-Hexafluoroisopropylmethacrylate (cas: 3063-94-3) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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. Quality Control of 1,1,1,3,3,3-Hexafluoroisopropylmethacrylate

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

Effect of metal oxide composite method on catalytic oxidation performance of aerogel supported Pd catalysts in oxidative carbonylation was written by Peng, Meng;Hong, Chao;Huang, Yuhai;Cheng, Ping;Yuan, Hua. And the article was included in Journal of Organometallic Chemistry in 2020.Application In Synthesis of Diphenyl carbonate The following contents are mentioned in the article:

A series of metal manganese-cerium silicon composite aerogel supported Pd catalysts were prepared by the in-situ method, the precipitation method and the impregnation method. The catalysts were applied to synthesize di-Ph carbonate (DPC) by oxidative carbonylation. The effects of different preparation methods and composite metal oxide contents on catalytic activities were studied. The prepared catalysts were characterized by XRD, FTIR, BET, TEM, H₂-TPR and XPS. The results showed that the metal composite method had a great influence on the catalyst particle size and sp. surface area; the low temperature oxidation performance and surface oxygen species content of the catalysts prepared by different methods were different. The catalyst prepared by the impregnation method has a large sp. surface area and particle size, good low-temperature oxidation performance and more surface adsorption oxygen, which helps to improve the multi-step electron transfer efficiency, to promote the regeneration of the active component Pd²⁺ and to increase catalytic activity. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Application In Synthesis of Diphenyl carbonate).

Diphenyl carbonate (cas: 102-09-0) 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. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Application In Synthesis of Diphenyl carbonate

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