Tag: 100-200

Determination of characteristic components in tow flavored filter sticks by P&T-GC-MS and their transfer behavior was written by Ning, Zhen-xing;Zhang, Ding-jie;Yang, Long-yan;Li, Ji-gang;Huang, Shan-song;Ban, Qiang;Zhang, Jun-song. And the article was included in Baozhuang Gongcheng in 2022.Recommanded Product: 659-70-1 This article mentions the following:

The work aims to form a monitoring system for the aroma components in tow flavored filter sticks. Purge & Trap-Gas Chromatog.-Mass Spectrometry/SIM (P&T-GC-MS/SIM) was used to establish a detection method for the characteristic aroma components in tow flavored filter sticks and study the transfer behavior of characteristic aroma components to mainstream smoke. The optimal parameters of Purge & Trap were: 14 min of purging time, 75°C of surging temperature, 50 min/mL of surging flow and 215°C of decomposition temperature, and the Surge & Trap efficiency of aroma components under these conditions was the highest. The 9 aroma components showed good linearity at 0.2�00 ng/mL (r>0.9990), with RSD of 0.15%�.97% (n=6), recovery rate of 83.91%�03.31%, limit of detection of 0.37�3.50 ng/mL and limit of quantification of 1.23�4.99 ng/mL. The transfer rate of main aroma components to particulate matter in mainstream smoke was 1.04%�.63%, and descending order was aldehydes, olefins and esters. The residue rate of aroma components in the tow flavored filter stick was 74.15%�5.71%, and most of the aroma components were trapped in the filter. The method has the advantages of low detection limit, simple treatment process, good repeatability and high sensitivity, and is suitable for the detection and anal. of aroma components in the tow flavored filter sticks. In the experiment, the researchers used many compounds, for example, Isopentyl 3-methylbutanoate (cas: 659-70-1Recommanded Product: 659-70-1).

Isopentyl 3-methylbutanoate (cas: 659-70-1) 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. 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.Recommanded Product: 659-70-1

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

Effects on must and wine volatile composition after biostimulation with a brown alga to Tempranillo grapevines in two seasons was written by Gutierrez-Gamboa, Gaston;Garde-Cerdan, Teresa;Rubio-Breton, Pilar;Perez-Alvarez, Eva P.. And the article was included in Journal of the Science of Food and Agriculture in 2021.Recommanded Product: 5-Hexyldihydrofuran-2(3H)-one This article mentions the following:

Seaweed application has been defined as a novel technique capable of improving the content of secondary metabolites in berries. There is limited available information about its effects on must and wine volatile composition This field trial aimed to study the effects of biostimulation to Tempranillo grapevines through an Ascophyllum nodosum fertilizer applied at a low dosage (Ld) and high dosage (Hd) on must and wine volatile compounds over two seasons. Ld treatment scarcely affected must and wine volatile compounds in both seasons. Hd foliar application increased the content in musts of several individual terpenoids, C13 norisoprenoids, esters, benzenoids, alcs., carbonyl compounds and C6 compounds in 2018. Must yeast assimilable nitrogen conditioned the production of wine volatile compounds These results suggest that seaweeds applications can act as elicitors in Tempranillo, triggering the synthesis of several compounds by the plant in musts during a season with a high rainfall and relative humidity. 2020 Society of Chem. Industry. In the experiment, the researchers used many compounds, for example, 5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9Recommanded Product: 5-Hexyldihydrofuran-2(3H)-one).

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 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. Recommanded Product: 5-Hexyldihydrofuran-2(3H)-one

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

Initiators of the Type Mo(NAr)(CHR’)(OR”)₂ for the Controlled Polymerization of Diethyldipropargylmalonate was written by Adamchuk, Jennifer;Schrock, Richard R.;Tonzetich, Zachary J.;Mueller, Peter. And the article was included in Organometallics in 2006.Electric Literature of C10H14O4 This article mentions the following:

Molybdenum arylimido carbene dialkoxide complexes were prepared by alkoxide and carbene substitution reactions; the prepared complexes were tested in oligomerization of di-Et dipropargylmalonate into cyclopentene-ethylene conjugated oligomers. The reaction between carbene molybdenum alcoholate [Mo(NAr)(trans-CHCH:CHMe)[OCMe(CF₃)₂]₂(quin)] (Ar = 2,6-ⁱPr₂C₆H₃; quin = quinuclidine) and lithium tert-butoxide yields [Mo(NAr)(trans-CHCH:CHMe)(O^tBu)₂(quin)] (1). The achiral,syn isomer could be isolated and was shown in an x-ray study to be a trigonal bipyramid in which quinuclidine is coordinated trans to a syn-butenylidene carbene ligand. A base-free species (2) that contains a five-membered ring as part of a trienylidene unit could be obtained by treating Mo(NAr)(CHCMe₂R)[OCMe(CF₃)₂]₂ (R = Me, Ph) with di-Et 3-isobutenyl-4-vinylcyclopent-3-ene-1,1-dicarboxylate (B) in pentane. The tert-butoxide analog of 2 (3) was obtained straightforwardly and was shown in an x-ray study to be the syn-alkylidene isomer. The reaction between 3-vinyl-3-cyclohexene-1,1-dicarboxylate and Mo(NAr)(CHCMe₃)[OCMe(CF₃)₂]₂ gave Mo(NAr)[(5,5-bis(ethoxycarbonyl)-3-cyclohexen-1-yl)methylene][OCMe(CF₃)₂]₂ (5a),which could be treated with LiO-t-Bu to yield an analogous tert-butoxide species (5b). An x-ray structure of a sample of 5b that retained 2 equiv of LiOCMe(CF₃)₂ showed it to be a dimeric species in which two Mo complexes were joined through a Li₄O₄ heterocubane-type structure binding to one ester oxygen in each of the Mo species. Reactions between di-Et dipropargylmalonate (DEDPM) and tert-butoxides 1, 3, or 5b yielded in oligomers containing cyclopentene rings conjugated by ethenediyl bridges; k_p/k_i values being less than 1. All reactions can be followed by proton NMR spectra of the alkylidene proton region, and all appear to be living polymerizations under the conditions employed. A Wittig-like reaction between di-Et 3-formyl-4-(2-methyl-2-propenyl)cyclopent-3-ene-1,1-dicarboxylate (A) and 2 yielded a sym. pentaene I (C, n = 1) as an ivory-colored solid. The heptene I (D, n = 2) and the nonene I (E, n = 2) could be isolated from reactions between 1 equiv of DEDPM and 3 in CH₂Cl₂ in the presence of 1 equiv of quinuclidine at -30° followed by quenching with aldehyde A. In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Electric Literature of C10H14O4).

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

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

Reactivity and Catalytic Activity of Homobimetallic Vanadium(V) Complex Derived from Bis(5-chlorosalicylaldehyde)oxaloyldihydrazone Ligand was written by Syiemlieh, Ibanphylla;Asthana, Mrityunjaya;Lal, Ram A.. And the article was included in Applied Organometallic Chemistry in 2019.Computed Properties of C9H10O3 This article mentions the following:

Homobimetallic vanadium(V) complex of the composition [(CH₃)₂NH₂⁺]₂[(VO₂)₂(sloxCl)].4H₂O was synthesized from the reaction of V₂O₅ with bis(5-chlorosalicylaldehyde)oxaloyldihydrazone ligand in a 1:1 molar ratio in methanol. The structure of the complex was established by x-ray crystallog. Reactivity of the complex with H₂O₂ leads to bis (monooxidoperoxidovanadate(V)) [{VO(O₂)}₂(sloxCl)]^2- formation and with HCl, oxidohydroxido complex of composition [(VO) (OH)(sloxCl)]^2- was formed. Binding interaction of the complex was also investigated toward protein (BSA) and it is 2.21 × 10⁸ M^-1. The catalytic activity of the complex in the oxidation of alcs. and oxidative bromination of some organic substrates was also studied, and it showed a great potent as a catalyst. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Computed Properties of C9H10O3).

Ethyl 2-hydroxybenzoate (cas: 118-61-6) 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.Computed Properties of C9H10O3

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

Ethyl salicylate and ethyl benzoate for vortex-assisted surfactant-enhanced emulsification microextraction of fungicides in water samples and analysis by high-performance liquid chromatography was written by Santaladchaiyakit, Yanawath;Rattanapukdee, Punyanuch;Hunjangsit, Kannika;Phurimsak, Chayakom;Srijaranai, Supalax. And the article was included in International Journal of Environmental Analytical Chemistry.Application of 118-61-6 This article mentions the following:

Et salicylate (EtSA) and Et benzoate (EtBZ) as alternative extraction solvents have been evaluated for vortex-assisted surfactant-enhanced emulsification microextraction (VASEME) of target fungicides (e.g. carbendazim, thiabendazole, and fuberidazole) before the high-performance liquid chromatog. anal. Under optimum conditions, the preconcentration factors about 16-28 (18-33) and limits of detection in the range of 0.01-0.1 μg/L were achieved for both extraction solvents. Good recoveries in the range of 76.2-118.4% (85.7-114.6%) with the acceptable relative standard deviation lower than 10.4 were obtained at the concentration evaluation of 20 μg/L and 50 μg/L each fungicide in different water sample matrixes. As a result, the proposed extraction solvents can be used as an alternative to other related solvents like Me salicylate (MeSA) and Me benzoate (MeBZ) for the preconcentration of target fungicides. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Application of 118-61-6).

Ethyl 2-hydroxybenzoate (cas: 118-61-6) 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. 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 of 118-61-6

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

Impact of a novel probiotic Lactobacillus strain isolated from the bee gut on GABA content, antioxidant activity, and potential cytotoxic activity against HT-29 cell line of rice bran was written by Ghamry, Mohamed;Ghazal, Ahmed Fathy;Al-Maqtqri, Qais Ali;Li, Li;Zhao, Wei. And the article was included in Journal of Food Science and Technology (New Delhi, India) in 2022.Application of 706-14-9 This article mentions the following:

Rice bran was fermented with Lactobacillus apis, isolated from the bee gut as a novel probiotic strain, and Saccharomyces cerevisiae to investigate the relationship between its metabolites and antioxidant activity, nutraceutical value, and cytotoxic activity against the HT-29 cell line. The findings showed that L. apis improved the antioxidant activity (DPPH of 37.73%) and antioxidant capacity (ABTS of 37.62 mg Trolox/g,), as well as, hydroxyl radical-scavenging activity (91.55%) of rice bran compared to S. cerevisiae. The metabolic anal. of volatile compounds revealed an increase of alcs. and lactones in the samples fermented with S. cerevisiae. While the samples fermented with L. apis displayed an increase of ketones, esters, and thiazoles. On the other hand, L. apis and S. cerevisiae exhibited a significant ability to increase γ-aminobutyric acid during different fermentation times. Compared with non-fermented samples (18.54%), L. apis increased the cytotoxic activity of rice bran against the HT-29 cell line to 34.17%, and S. cerevisiae to 31.34%. These results suggest that the fermentation of rice bran with S. cerevisiae and L. apis provides a promising strategy to improve the antioxidant activity and nutraceuticals of rice bran, and a potential source for plant-based pharmaceutical products. In the experiment, the researchers used many compounds, for example, 5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9Application of 706-14-9).

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.Application of 706-14-9

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

Effects of Volatile Organic Compounds (VOCs) emitted by citrus infested with Aonidiella aurantii on the predator Rhyzobius lophanthae attraction was written by Alsabte, Ahmed;Ahmed, Qasim Hussein;Kayahan, Ali;Karaca, Ismail. And the article was included in Phytoparasitica in 2022.Computed Properties of C12H20O2 This article mentions the following:

This study identifies the volatile organic compounds (VOCs) emitted by citrus when infested with California red scale (Aonidiella aurantii) and determines which of these elicit behavior responses in the predator Rhyzobius lophanthae. Headspace solid-phase micro extractions (HS-SPME) technique combined with gas chromatog.-mass spectrometry (GC-MS) was used to identify compounds and Y-tube olfactometer to determine R. lophanthae behavior responses. According to the results, 22 VOCs were detected in infested citrus plants and some of them were increased in lemon, orange and tangerine by A. aurantii infestation. R. lophanthae individuals were attracted to infested citrus saplings. According to bioassays with the olfactometer, they were attracted to Me salicylate and D-limonene at dosages of 1 and 10μL/mL by using a Y-tube olfactometer. These results explain how citrus volatiles can affect the response of the predator R. lophanthae. In the experiment, the researchers used many compounds, for example, (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3Computed Properties of C12H20O2).

(E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3) 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. 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.Computed Properties of C12H20O2

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

Volatile composition of Baga red wine Assessment of the identification of the would-be impact odorants was written by Rocha, Silvia M.;Rodrigues, Fanny;Coutinho, Paula;Delgadillo, Ivonne;Coimbra, Manuel A.. And the article was included in Analytica Chimica Acta in 2004.Recommanded Product: 15399-05-0 This article mentions the following:

Wines produced from Baga native variety from the Portuguese Bairrada Appellation, harvest 2000, were submitted to a liquid-liquid continuous extraction with dichloromethane and anal. by gas chromatog.-mass spectrometry (GC-MS). A total of 53 compounds were identified and quantified. This wine has 225 mg l^-1 volatile compounds, which include aliphatic and aromatic alcs. (44%), acids (27%), esters (15%), lactones (6%), amides (5%), and phenols (1%). To achieve the identification of the major would-be impact odorants, the aroma index was calculated using the concentration of each volatile component and the corresponding odor threshold reported in the literature. This methodol. proved suitable, as a preliminary step, for the determination of the would-be impact odorants of Baga wine. From the 53 compounds identified, 9 were determined as the most powerful odorants: guaiacol, 3-methylbutanoic acid, 4-ethoxycarbonyl-γ-butyrolactone, isobutyric acid, 2-phenylethanol, γ-nonalactone, octanoic acid, Et octanoate and 4-(1-hydroxyethyl)-γ-butyrolactone. These data suggest Baga wine as a fruity-type product with an aroma correlated to a restricted number of compounds In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0Recommanded Product: 15399-05-0).

Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0) 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. 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: 15399-05-0

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

Essential Oil, Aroma, and Fatty Acid Profiles of Five Endemic Salvia Taxa from Turkey with Chemometric Analysis was written by Ertas, Abdulselam;Akdeniz, Mehmet;Yener, Ismail;Ozturk, Mehmet;Tokul Olmez, Ozge;Firat, Mehmet;Kolak, Ufuk. And the article was included in Chemistry & Biodiversity in 2022.Application In Synthesis of (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate This article mentions the following:

The essential oil, aroma, and fatty acid compositions of Salvia cerino-pruinosa var. cerino-pruinosa, S. cerino-pruinosa var. elazigensis, S. pseudeuphratica, S. rosifolia, and S. kurdica collected in 2015, 2016, and 2017 were analyzed by GC-FID, GC/MS/Head Space and GC/MS. The results were evaluated chemometrically for principal component analyses and hierarchical clustering analyses using Minitab program. The main components of their essential oils have been determined as germacrene-D (41.79 % highest for these species), camphor (55.80 %), linalool (33.38 %), caryophyllene oxide (32.99 %), 1,8-cineole (26.30 %) and geraniol acetate (31.63 %), while for aroma 1,8-cineole (45.95 % highest for these species), camphor (58.54 %), D-limonene (40.83 %), linalool (27.67 %) and cis-linalool oxide (25.87 %). Oleic (72.65 % highest for these species), erucic (44.61 %), 2-palmitoleic (42.17 %) and nervonic (32.61 %) acids were determined as major components of their fatty acids. According to the PCA and HCA, the essential oil components of these Salvia taxa unaffected by the years, and accordingly, the Salvia taxa grouped among themselves. 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. 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.Application In Synthesis of (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate

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

The total synthesis of chlorophyll a was written by Woodward, Robert Burns;Ayer, William A.;Beaton, John M.;Bickelhaupt, Friedrich;Bonnett, Raymond;Buchschacher, Paul;Closs, Gerhard L.;Dutler, Hans;Hannah, John. And the article was included in Tetrahedron in 1990.Safety of Ethyl 4-methyl-1H-pyrrole-3-carboxylate This article mentions the following:

The total synthesis of chlorophyll a starting Knorr’s pyrrole (I) is described with full exptl. detail. Forty six stages are involved to reach the target mol., chlorin e₆ tri-Me ester (II) from which chlorophyll a has already been prepared The four pyrroles which are required for rings A, B, C and D are elaborated largely by known reactions, although with considerable improvements. These pyrroles are manipulated to give two dipyrrin derivatives These are brought together in a carefully controlled, stepwise, condensation to give a single porphyrin product in 50% yield. Eleven steps complete the synthesis. In the experiment, the researchers used many compounds, for example, Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7Safety of Ethyl 4-methyl-1H-pyrrole-3-carboxylate).

Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7) 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. 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.Safety of Ethyl 4-methyl-1H-pyrrole-3-carboxylate

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