Category: 1731-94-8

Phytochemical screening, GC-MS analysis and antioxidant activity of Curcurbita pepo L. using its leaf sample was written by Sunday, Ezekwe Ahamefula;Nnedimma, Nwadike Constance;Peter, Wokocha Gift;Orlando, George Boma. And the article was included in Asian Journal of Biology in 2021.Product Details of 1731-94-8 The following contents are mentioned in the article:

This study evaluated the phytochem. screening, gas chromatog.-mass spectrometry (GCMS) anal. and antioxidant activity of Curcurbita pepo L. using its leaf sample with standard methods. The sample used for the study was procured from Imo State University school farm and was properly identified. Result of phytochem. screening revealed the presence of saponins, flavonoids, alkaloids, steroids, phlobactannins, proteins, and anthraquinnones, while the GC-MS anal. revealed a total of 78 compounds, out which Bis(2-ethylhexyl) phthalate (C24H38O4) had the highest mol. weight, 2,4,6-Octatriene, 2,6-dimethyl- (C10H16) had the highest peak area of 10.21% while Morphinan-6-ol, 4,5-epoxy-N-methyl-, 5α 6α- (C17H21NO2) had the highest retention time. The antioxidant activity of the studied sample was enhanced against the control. Some of the compounds as revealed by GC-MS anal. could be of healthcare or industrial importance. There is need for further studies on the leaf sample to ascertain further the observations of the present study. This study has evaluated the phytochem. screening, GC-MS anal. and antioxidant activity of C. pepo L. using its leaf sample. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8Product Details of 1731-94-8).

Methyl nonadecanoate (cas: 1731-94-8) 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. 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.Product Details of 1731-94-8

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

Taming waste: Waste Mangifera indica peel as a sustainable catalyst for biodiesel production at room temperature was written by Laskar, Ikbal Bahar;Gupta, Rajat;Chatterjee, Sushovan;Vanlalveni, Chhangte;Rokhum, Lalthazuala. And the article was included in Renewable Energy in 2020.Reference of 1731-94-8 The following contents are mentioned in the article:

In the present study, the efficacy of waste peels of mango (Mangifera indica) as a basic catalyst in room temperature transesterification reaction is investigated for biodiesel production from soybean oil. Biowaste based catalyst, Mangifera indica peel ash, was prepared by conventional open air burning of the mango peel. The morphol. and chem. components of the catalyst are investigated using several techniques such as X-ray diffraction (XRD), Fourier Transform IR Spectroscopy (FT-IR), SEM (SEM), Transmission Electron Microscopy (TEM), Thermogravimetric anal. (TGA), X-ray fluorescence (XRF), XPS, Energy-dispersive X-ray spectroscopy (EDS), Brunauer-Emmett-Teller (BET) and Hammett indicator method. The highest biodiesel yield of 98% was attained under the optimized reaction conditions; methanol to oil ration of 6:1, catalyst loading of 6 wt%, and time of 4 h under room temperature Crucially, the catalyst retained its activity up to 4th cycle of reused. The excellent catalytic activity of the ash catalyst could be attributed to the presence of highly basic metal oxides such as K₂O, MgO and CaO, its high surface area and porous nature. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8Reference of 1731-94-8).

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. 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.Reference of 1731-94-8

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

GC-FID methodology validation for the fatty esters content determination in biodiesel with hexadecyl acetate as the internal standard was written by Braun, Joao V.;dos Santos, Vinicius O. B.;Fontoura, Luiz A. M.;Pereira, Evandro;Napp, Amanda;Seferin, Marcus;Lima, Jeane;Ligabue, Rosane;Vainstein, Marilene H.. And the article was included in Quimica Nova in 2017.Related Products of 1731-94-8 The following contents are mentioned in the article:

Biodiesel purity expressed as fatty esters content is one of its most important quality parameters. Although several instrumental methods have been employed, gas chromatog. with internal standard calibration has been the most used. Biodiesel is a very complex matrix, therefore finding a suitable internal standard (IS) is not straightforward. EN14103:2003 standard established Me heptadecanoate (C17:0) as IS. Since this fatty ester is naturally present in some biodiesel feedstock as tallow, that standard was reviewed in 2011, and Me nonadecanoate (C19:0) became the new IS. In turn, C19:0 produces a peak on the chromatogram that is difficult to resolve from Me linoeate (C18:2) and metyl linolenate (C18:3) ones. In this paper, a GC-FID method for the determination of the esters content in Me and Et biodiesel from canola and soy oils, using hexadecyl acetate as a new internal standard was validated. EN14103:2003 was used as reference method. Method selectivity, accuracy (t student parameter < 2.18 from both methods), repeatability (0.1-0.4%), intermediate precision (0.2-1.8%), and robustness (0.1-1.6%) were investigated and considered appropriate for the scope. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8Related Products of 1731-94-8).

Methyl nonadecanoate (cas: 1731-94-8) 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. 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.Related Products of 1731-94-8

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

Sodium titanate nanotubes for efficient transesterification of oils into biodiesel was written by Zaki, Ayman H.;Naeim, Asamaa A.;EL-Dek, Samaa I.. And the article was included in Environmental Science and Pollution Research in 2019.Electric Literature of C20H40O2 The following contents are mentioned in the article:

In this work, sodium titanate nanotubes were prepared by a hydrothermal method for 23 h at 160°C and characterized by high-resolution transmission electron microscopy (HRTEM), field emission SEM (FESEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) methods, and Fourier transform IR (FT-IR) spectroscopy. The obtained nanotubes were used as catalysts in the transesterification of pure and cooked oils under different exptl. conditions (molar ratio, temperature, catalyst weight, and time). The catalyst showed high efficiency depending on the chosen conditions. The biodiesel yield was found to be 95.9% at 80°C for 2 h. The catalyst also showed high activity for cooked oil conversion, with yields of 96.0, 96.0, and 93.58% for the first, second, and third uses of oil, resp. The methanol was recycled and used in another transesterification experiment, and the biodiesel yield reached 91%. D. functional theory, Monte Carlo simulation, and mol. dynamics simulation were employed to clearly understand the transesterification mechanism. The transesterification reaction is represented by a pseudo-first-order kinetics model. [Figure not available: see fulltext.]. 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. 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. 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 C20H40O2

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

Sweet sorghum stalk liquefaction in supercritical methanol: Effects of operating conditions on product yields and molecular composition of soluble fraction was written by Yan, Hong-Lei;Zong, Zhi-Min;Li, Zhan-Ku;Kong, Jiao;Zheng, Quan-Xi;Li, Yan;Wei, Xian-Yong. And the article was included in Fuel Processing Technology in 2017.Computed Properties of C20H40O2 The following contents are mentioned in the article:

Liquefaction of sweet sorghum stalk (SSS) in supercritical methanol was carried out under different conditions, including temperature, holding time, and SSS-to-methanol ratio. Each reaction mixture was filtrated to afford residue and bio-oil (BO, i.e., methanol-soluble portion). The optimal conditions were determined to be 300 °C and 30 min based on the BO yield and the maximum yield of BO is 40.5 wt% with higher heating value of 25.1 kJ g^– 1. Low SSS-to-methanol ratio, i.e., either more methanol volume or less SSS dose, benefits the BO yield. According to gas chromatograph/mass spectrometric anal., the compounds detected in the BOs can be grouped into hydrocarbons, alcs., phenolic compounds (PCs), methoxybenzenes, ketones, esters, and others. Among them, PCs and esters are the most abundant. Guaiacols and alkylphenols are predominant PCs, which were mainly originated from the decomposition of lignin in SSS. Esters can be further classified into long-chain Me esters (LCMEs), short-chain Me esters (SCMEs), di-Me diesters, and polymethyl benzenepolycarboxylates. The variation of esters mainly relied on LCME and SCME change with varied reaction conditions. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8Computed Properties 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. Polyesters are important plastics, with monomers linked by ester moieties. 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.Computed Properties of C20H40O2

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

Rhabdaerophilum calidifontis gen. nov., sp. nov., a novel bacterium isolated from a hot spring, and proposal of Rhabdaerophilaceae fam. nov. was written by Ming, Yu-Zhen;Liu, Lan;Xian, Wen-Dong;Jiao, Jian-Yu.;Liu, Ze-Tao;Li, Meng-Meng;Xiao, Min;Li, Wen-Jun. And the article was included in International Journal of Systematic and Evolutionary Microbiology in 2020.Reference of 1731-94-8 The following contents are mentioned in the article:

A novel thermotolerant bacterial strain was isolated from a hot spring in a Tibetan geothermal field. Phylogenetic anal. of the 16S rRNA gene sequence of the novel strain showed that it belongs to a distinct lineage far from any known taxa. The new isolate shared the highest pairwise sequence identity with Phreatobacter cathodiphilus S-12T (92.8% similarity) according to the 16S rRNA gene sequences. Cells were Gram-stain-neg., aerobic, rod-shaped and formed white round colonies. The strain grew at the ranges of 28-45°C (optimum, 37°C), pH 5.0-7.0 (optimum, pH 6.0) and 0-2% NaCl. The strain was pos. for catalase and oxidase. The major respiratory quinone was ubiquinone Q-10. Polar lipids consisted of diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol and phosphatidylcholine. The major fatty acids were summed feature 8 (C18:1 ω7c and/or C18:1 ω6c). The DNA G+C content was 68.3 mol%. Based on these distinguishing properties, this strain is proposed to represent a new species of a new genus Rhabdaerophilum calidifontis gen. nov., sp. nov., within a new family Rhabdaerophilaceae fam. nov. The type strain of the type species of Rhabdaerophilum calidifontis is SYSU G02060T (=KCTC 72351T=CGMCC 1.17070T). This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8Reference of 1731-94-8).

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. 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.Reference of 1731-94-8

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

Green downstream processing using supercritical carbon dioxide, CO₂-expanded ethanol and pressurized hot water extractions for recovering bioactive compounds from Moringa oleifera leaves was written by Rodriguez-Perez, C.;Mendiola, J. A.;Quirantes-Pine, R.;Ibanez, E.;Segura-Carretero, A.. And the article was included in Journal of Supercritical Fluids in 2016.Product Details of 1731-94-8 The following contents are mentioned in the article:

A green platform based on a three-step downstream processing including the use of supercritical carbon dioxide (ScCO₂), carbon dioxide-expanded ethanol (CXE) and pressurized hot water (PHWE) extractions has been developed to obtain different fractions from Moringa oleifera leaves. Each process was optimized based on the extraction yield. Optimal extracts were functionally characterized by measuring total phenolic (TPC) and total flavonoid contents (TF). The antioxidant activity by TEAC assay was also tested. Moreover, a chem. characterization of the extracts was performed by GC-MS and HPLC-ESI-QTOF-MS. The extraction yields of the optimized process were 3.1, 29.5 and 30.2% resp. The extraction of total phenolics was higher in PHWE than in CXE extract (62.4 vs. 20.3 mg GAE/g leaves) while TF showed the opposite (3.8 vs. 9.6 mg quercetin/g leaves resp.). ScCO₂ fraction was rich in fatty acids such as α-linoleic acid and alkanes. CXE fraction was richer in glycosylated flavonoids than PHWE while the latest fraction was richer in phenolic acids, which could explain the higher antioxidant activity of this fraction (13.4 mmol Eq trolox/100 g dry leaves) compared to CXE (6 mmol Eq trolox/100 g dry leaves). This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8Product Details of 1731-94-8).

Methyl nonadecanoate (cas: 1731-94-8) 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. 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.Product Details of 1731-94-8

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

Integrated analysis and knockdown of RAB23 indicate the role of RAB23 in gastric adenocarcinoma was written by Chen, Hui;Pan, Dun;Yang, Zhihuang;Li, Liangqing. And the article was included in Annals of Translational Medicine in 2019.Safety of Methyl nonadecanoate The following contents are mentioned in the article:

Background: The present study aimed to identify key differentially expressed genes (DEGs) and miRNAs (DEmiRNAs) in gastric adenocarcinoma. Methods: We performed integrated anal. to determine DEGs and DEmiRNAs of gastric adenocarcinoma based on the GEO database. A DEmiRNA-target interaction network was established. GO and KEGG pathway enrichment analyses were utilized. Then, MKN45 cells were transfected with shRNA-RAB23 to knock down the expression of RAB23. CCK-8, transwell and flow cytometry assays were utilized to measure the capacities for cell proliferation, migration and apoptosis, and the apoptosis-related gene and protein levels were measured by using polymerase chain reaction (PCR) and Western blot, resp. Colocalization anal. of Snc1 with the vesicular protein VAMP3 and the endoplasmic reticulum protein Calnexin was performed to assess the influence of RAB23 on vesicle transport. Finally, we performed metabolomic anal. by using gas chromatog. mass spectrometry (GC-MS). Results: We performed MMIA of gastric adenocarcinoma based on two miRNA datasets and two mRNA datasets. A total of 4,586 DEmRNAs and 30 DEmiRNAs were obtained. The DEmRNAs of gastric adenocarcinoma were significantly enriched in PI3K/Akt signaling. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8Safety of Methyl nonadecanoate).

Methyl nonadecanoate (cas: 1731-94-8) 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. 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.Safety of Methyl nonadecanoate

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

Response Factor Correction for Estimation of Ester Content in Biodiesel was written by Singh, Dheer;Chopra, Anju;Kumar, Ravindra;Sastry, M. I. S.;Patel, M. B.;Basu, B.. And the article was included in Chromatographia in 2014.Quality Control of Methyl nonadecanoate The following contents are mentioned in the article:

EN 14103 is generally used for quantification of ester content in biodiesel free of heptadecanoate ester (C17:0) or Me nonadecanoate (C19:0), which are employed as internal standards Ester content obtained by EN 14103 method did not match with theor. value of biodiesel, as the method did not take care of response factors of each component to compensate for changes in detector sensitivities. In this study, the whole range of fatty acid (C₆-C_24:1) Me esters were taken into consideration for the calculation of the ester content. Me nonadecanoate (C19:0) was used as an internal standard The response factors of both the saturated and unsaturated Me esters in the range C₆-C_24:1 were estimated and found in the range 0.97-1.16. The ester content was calculated after applying the response factors of each Me ester. The results obtained by this method agreed well with the theor. value as compared to estimated value using EN14103 method. The results obtained from this method also show good correlation (R² = 0.98) with ¹H-NMR method. Further, this method does not depend on nature of biodiesel feed stock and is applicable to all Me biodiesel samples obtained from different raw materials. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8Quality Control of Methyl nonadecanoate).

Methyl nonadecanoate (cas: 1731-94-8) 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.Quality Control of Methyl nonadecanoate

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

Comparative profiling analysis of woody flavouring from vine-shoots and oak chips was written by Delgado de la Torre, M. Pilar;Priego-Capote, Feliciano;Luque de Castro, M. Dolores. And the article was included in Journal of the Science of Food and Agriculture in 2014.Electric Literature of C20H40O2 The following contents are mentioned in the article:

BACKGROUNDWoody liquid flavourings extracted from different varieties of vine shoots and oak chips have been characterized by gas chromatog.-mass spectrometry to compare the profile of compounds as potential contributors to the organoleptical properties of wine and spirits aged in oak barrels. Oak chips are frequently added to barrels to accelerate the ageing process, while vine shoots are produced in high amounts in wine-producing countries. RESULTSThe extracts were isolated by superheated liquid extraction (SHLE) after optimization of extraction variables. The SHLE protocol was performed using ethanol-water mixtures (pH 3) at 220 °C for 60 min. Compounds were identified using NIST databases, and the resulting profile was used as a dataset for qual. and semi-quant. comparison between extracts obtained from different varieties of vine shoots and oak chips. CONCLUSIONStatistical anal. enabled demonstration of the similarity among extracts from vine shoots and oak wood, providing the first study on this subject. The special role of phenols and furanic derivatives has been described. This study is the first stage for characterization of vine shoots as a byproduct with potential for use in the oenol. field. © 2013 Society of Chem. Industry. 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. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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.Electric Literature of C20H40O2

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