Month: December 2022

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

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

Analysis of polymer parts: buried problems was written by Walzak, Mary Jane;Bloomfield, Heather. And the article was included in Surface and Interface Analysis in 2017.Application In Synthesis of Ethyl 3-ethoxypropanoate The following contents are mentioned in the article:

The anal. of manufactured parts for the source of defects is challenging as these defects are often buried below the surface. An example of this type of problem is a defect that occurs in a molded and multilayered painted part. The automotive industry continues to increase the amount of plastics used in their vehicles in order to reduce weight and increase fuel efficiencies. The polymers are usually specified based on their mech. properties as it is these properties that will dictate the effectiveness of the polymer in replacing a metal part. The paintability of the surface is often a secondary consideration. The polymer alloy of polycarbonate and acrylonitrile/butadiene/styrene is used in some interior and exterior car components. This polymer alloy has a number of mech. properties that make it attractive for use in automotive parts, however, variations in its domain structure can have an effect on its properties. The process of identifying the root cause of a defect occurring on a painted molded polycarbonate/acrylonitrile/butadiene/styrene part will be examined This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9Application In Synthesis of Ethyl 3-ethoxypropanoate).

Ethyl 3-ethoxypropanoate (cas: 763-69-9) 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, 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.Application In Synthesis of Ethyl 3-ethoxypropanoate

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

Effects of three indigenous non-Saccharomyces yeasts and their pairwise combinations in co-fermentation with Saccharomyces cerevisiae on volatile compounds of Petit Manseng wines was written by Zhang, Boqin;Tang, Chong;Yang, Dongqing;Liu, Hui;Xue, Jiao;Duan, Changqing;Yan, Guoliang. And the article was included in Food Chemistry in 2022.Recommanded Product: Isopentyl hexanoate The following contents are mentioned in the article:

The combined use of selected Saccharomyces cerevisiae and non-Saccharomyces strains is becoming an effective way to achieve wine products with distinctive aromas. The purpose of this study was to further improve the wine aroma complexity through optimizing inoculation protocols of multi-starters. The three indigenous non-Saccharomyces strains (Torulaspora delbrueckii, Hanseniaspora vineae, and Lachancea thermotolerans) and their pairwise combinations (co-inoculation) were sequentially inoculated with S. cerevisiae in Petit Manseng grape must, resp. Results evidenced a higher divergence in aroma compounds produced by two different non-Saccharomyces species compared to single species. Especially for the combination of T. delbrueckii and L. thermotolerans, the concentrations of most Et esters were further increased, contributing to a higher score of pineapple note in agreement with sensory anal. Our results highlighted that the inoculation of more than one non-Saccharomyces species is a potential strategy to improve the aroma diversity and quality of industrial wines. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Recommanded Product: 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. 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: Isopentyl hexanoate

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

Transesterification of castor oil for biodiesel production: Process optimization and characterization was written by Elango, Ragul Karthick;Sathiasivan, Kiruthika;Muthukumaran, Chandrasekaran;Thangavelu, Viruthagiri;Rajesh, Mathur;Tamilarasan, Krishnamurthi. And the article was included in Microchemical Journal in 2019.COA of Formula: C20H40O2 The following contents are mentioned in the article:

In the present study, batch scale biodiesel production was carried out using castor oil by alkali-catalyzed transesterification process was reported. Initially, the transesterification parameters like reaction time, catalyst concentration, reaction temperature and oil: methanol molar ratio on biodiesel production was optimized by conventional method followed by statistical based central composite design method. According to the optimized exptl. results, the maximum of 94.9% FAME yield was obtained at 60°C with 1.25% (w/v) KOH catalyst and 1:12 oil: methanol molar ratio for 60 min of reaction, which was in agreement with the predicted yield (93.7%). The purification of crude biodiesel was performed by simple evaporation and silica gel adsorption. The quality of fatty acid Me ester was examined by Fourier Transform IR spectroscopy (FT-IR), Thin layer chromatog. (TLC) and Gas Chromatog.-Mass Spectrometry (GC-MS). The anal. results showed that significant quantity of Me ester groups like ricinoleic, linolenic, palmitic acid and oleic acid were present in the biodiesel. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8COA of Formula: C20H40O2).

Methyl nonadecanoate (cas: 1731-94-8) 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. 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.COA of Formula: C20H40O2

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

Construction and analysis of a food-grade Lactiplantibacillus plantarum esterase/lipase overexpression system was written by He, Xi;Liu, Peng;Tang, Xiaojian;Wang, Ting;Xu, Zhenshang;Hou, Dongdong;Wu, Dan;Han, Ning. And the article was included in LWT–Food Science and Technology in 2022.Safety of Isopentyl hexanoate The following contents are mentioned in the article:

Lactiplantibacillus plantarum (L. plantarum) is widely used in the food industry, especially in meat fermentation and dairy processing, due to its lipase and esterase activities. In this study, lp_1002 from L. plantarum WCFS1 was cloned into the food-grade gene expression vector pMG36n, with nisin used as a selective marker. Furthermore, pMG36n- lp_1002 was retransformed into L. plantarum WCFS1, and lp_1002 was overexpressed in the newly constructed L. plantarum WCFS1 strain. Moreover, recombinant Lp_1002 showed the characteristics of both lipase and esterase. The results from hydrolysis of p-nitrophenylphosphate (pNPP) and triglycerides showed that the hydrolysis activities of the recombinant Lp_1002 were 420% and 360% higher than that of the original strain, resp. In addition, the results of wine MLF fermentation suggest that the recombinant strain significantly reduced the contents of Et esters, acetate esters and other types of esters, which affected wine aroma during brewing. Therefore, the recombinant strain has great application potential in food fermentation This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Safety 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. 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.Safety of Isopentyl hexanoate

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

Discovery of Salidroside Glycoside Analogs as Novel Angiogenesis Agents to Treat Diabetic Hind Limb Ischemia was written by Liu, Caiping;Han, Jingxuan;Marcelina, Olivia;Nugrahaningrum, Dyah Ari;Huang, Song;Zou, Meijuan;Wang, Guixue;Miyagishi, Makoto;He, Yun;Wu, Shourong;Kasim, Vivi. And the article was included in Journal of Medicinal Chemistry in 2022.Related Products of 604-69-3 The following contents are mentioned in the article:

Therapeutic angiogenesis is a potential therapeutic strategy for hind limb ischemia (HLI); however, currently, there are no small-mol. drugs capable of inducing it at the clin. level. Activating the hypoxia-inducible factor-1 (HIF-1) pathway in skeletal muscle induces the secretion of angiogenic factors and thus is an attractive therapeutic angiogenesis strategy. Using salidroside, a natural glycosidic compound as a lead, we performed a structure-activity relationship (SAR) study for developing a more effective and drug angiogenesis agent. We found a novel glycoside scaffold compound (C-30) with better efficacy than salidroside in enhancing the accumulation of the HIF-1α protein and stimulating the paracrine functions of skeletal muscle cells. This in turn significantly increased the angiogenic potential of vascular endothelial and smooth muscle cells and, subsequently, induced the formation of mature, functional blood vessels in diabetic and non-diabetic HLI mice. Together, this study offers a novel, promising small-mol.-based therapeutic strategy for treating HLI. 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: 604-69-3Related Products 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 typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. 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.Related Products of 604-69-3

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

In vivo anti-mildew activity of essential oils against downy mildew of sunflower caused by PLASMOPARA HALSTEDII was written by Er, Yesim;Ozer, Nuray;Katircioglu, Yakup Zekai. And the article was included in European Journal of Plant Pathology in 2021.Formula: C8H16O2 The following contents are mentioned in the article:

Com. essential oils (EO) obtained from different parts of black cumin (N. sativa), mustard (S. nigra), St.John′s wort (H. perforatum), garlic (A. sativum), grape (V. vinifera), and ginger (Z. officinale) plants were evaluated for in vivo anti-mildew activity against pathotypes â€?71â€?and â€?73â€?of P.halstedii. The EOs were examined at concentrations of 0.2%, 0.4%, and 0.6% in susceptible sunflower varietyâ€?8-TR-003â€?as seed, foliar, and seed + foliar treatments. It was concluded that seed treatments could be applicable and appropriate, due to the phytotoxic effects of foliar treatments at increasing concentrations Moreover, it was observed that seed treatments with St.John′s wort, mustard, grape, ginger, or garlic EOs at a concentration of 0.6% exhibited anti-mildew activity with a decrease in sporangium quantity above 80% for pathotypes â€?71â€?and â€?73â€? Seed treatment with grape EO had the highest anti-mildew activity at a concentration of 0.6% and was found to be the most effective with a decrease in sporangium quantity above 90% for both pathotypes of the pathogen. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Formula: C8H16O2).

Methyl heptanoate (cas: 106-73-0) 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.Formula: C8H16O2

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

Analysis of volatile organic compounds in the ambient air of a paper mill- a case study was written by Tong, Xin;Zhang, Zhenbin;Chen, Xiaoquan;Shen, Wenhao. And the article was included in BioResources in 2015.Electric Literature of C20H40O2 The following contents are mentioned in the article:

In this work, volatile organic compounds (VOCs) in the ambient air of a secondary fiber paper mill were analyzed. For the sake of studying pollution comprehensively, four sites in the paper mill were analyzed and active sampling methods were used. Desorption was carried out with two solvents, carbon disulfide and dichloromethane. The compositions of VOCs were determined by gas chromatog.-mass spectrometry (GC-MS) method. The main identified substances in the four sites were as follows: (1) waste paper sorting room: alkanes, phenols, and esters; (2) papermaking workshop: benzene series, alkanes, ethers, and phenols; (3) vacuum pump outlet: benzene series and phenols; and (4) office area: benzene series and phenols. Two main toxic substances in VOCs, the benzene series and phenols, were detected in the ambient air of the paper mill. The benzene series existed in three places along the main process of the paper mill and even existed in the office area, which was far away from the production line. Addnl., phenols were detected in all sampling locations in the paper mill. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8Electric Literature of C20H40O2).

Methyl nonadecanoate (cas: 1731-94-8) 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. 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 C20H40O2

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