Month: November 2022

On July 31, 2021, Pang, Xiao-Na; Chen, Chang; Huang, Xiao-Ning; Yan, Yin-Zhuo; Chen, Jing-Yu; Han, Bei-Zhong published an article.Electric Literature of 123-25-1 The title of the article was Influence of indigenous lactic acid bacteria on the volatile flavor profile of light-flavor Baijiu. And the article contained the following:

Baijiu (Chinese liquor) is a type of traditional distilled spirit drink produced by spontaneous fermentation Lactic acid bacteria as the predominant bacteria during the fermentation of Baijiu may influence the flavor through the production of enzymes and metabolites. Results showed that there was significant difference in lactic acid bacteria counts between different fermentation periods. Indigenous lactic acid bacteria with high alc. tolerance and esterase activity were selected for fortified fermentation Inoculation with indigenous lactic acid bacteria significantly changed the flavor profile of Baijiu. All the selected strains promoted the formation of Et acetate which is an important flavor in Baijiu. Lactobacillus acetotolerans significantly promoted the formation of Et acetate, Et lactate, ethanol, acetic acid, and 2,4-di-tert-butylphenol. Sensory anal. revealed higher harmony in the samples fermented with L. hilgardii and L. acetotolerans, and higher intensive ester aroma in the samples fermented with L. planturum. The generation of flavors such as esters, alcs. and acids were species or even strain dependent. The results of this work will broaden our knowledge regarding the role of indigenous lactic acid bacteria during Baijiu manufacturing, and provide a potential approach for improving the flavor of Baijiu. The experimental process involved the reaction of Diethyl succinate(cas: 123-25-1).Electric Literature of 123-25-1

The Article related to volatile light flavor baijiu indigenous lactic acid bacteria, Food and Feed Chemistry: Analysis and other aspects.Electric Literature of 123-25-1

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

On April 30, 2020, Olmos-Espejel, Jose J.; Mogica-Garcia, Oscar E.; Duran-Gasca, Gerson J.; Carmona-Lopez, Magaly L. published an article.Reference of 2-Ethylhexyl 2-cyano-3,3-diphenylacrylate The title of the article was Methodology for Analysis of UV Filters in Tilapia Using Off-line MSPD Followed by On-line SPE-LC/UV. And the article contained the following:

Abstract: A sensitive method was developed and validated for the determination of UV filters (oxybenzone, octocrylene, 4-methyl-benzylidene camphor, 2-ethylhexyl-4-methoxycinnamate and avobenzone) in tilapia muscle using matrix solid-phase dispersion followed by online solid-phase extraction-liquid chromatog./UV. The validation showed good linearity from 100 to 3600 ng g-1 with r2 values > 0.98. Precision values with relative standard deviations were < 24% for all analytes. The accuracy was evaluated with the recovery of spiked muscle samples, and it ranged between 89 and 96% for most analytes, except 2-ethylhexyl-4-methoxycinnamate. A pos. matrix effect was observed for oxybenzone, so a matrix-matched calibration curve was used for quantitation purposes. This methodol. was applied to incurred samples of fish exposed to the analytes for 3 days (100μg L-1 each). Residual quantities of the contaminants were measured after 24, 48 and 72 h of exposure, and concentrations ranged between 400 and 2900 ng g-1. The developed method was able to quantify all of the target compounds at trace levels. The experimental process involved the reaction of 2-Ethylhexyl 2-cyano-3,3-diphenylacrylate(cas: 6197-30-4).Reference of 2-Ethylhexyl 2-cyano-3,3-diphenylacrylate

The Article related to uv filter compound tilapia matrix solid dispersion extraction lc, Food and Feed Chemistry: Analysis and other aspects.Reference of 2-Ethylhexyl 2-cyano-3,3-diphenylacrylate

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

On February 15, 2022, Cody, Robert B.; Fukudome, Takao; Ubukata, Masaaki published an article.Application of 123-25-1 The title of the article was Integrated data analysis making use of the total information from gas chromatography and high-resolution time-of-flight mass spectrometry to identify qualitative differences between two whisky samples. And the article contained the following:

Anal. of complex mixtures with gas chromatog. coupled with high-resolution time-of-flight mass spectrometry (GC/HRTOFMS) can produce a large amount of data. A new software program was recently reported that integrates all of the available mass spectrometric information from GC/HRTOFMS anal. into a concise report. New capabilities have now been added to the software to incorporate retention index data and to identify differences between two samples. Two Scotch whisky samples were sampled by solid-phase microextraction (SPME) and analyzed by GC/HRTOFMS. One of the two whisky samples (Sample B) was identical to the other sample (Sample A) except for an addnl. 6-mo storage in sherry casks. Both electron ionization (EI) and chem. ionization (CI) data were obtained using a new GC/TOFMS system (JEOL AccuTOF GC-Alpha) with enhanced resolving power and mass accuracy. Statistical anal. of replicate measurements of the whisky samples was carried out with a new software program (msFineAnal. version 3.2) to identify and assign differences between the samples. There were 124 peaks detected in the two whiskies. Thirteen compounds were detected with a relative peak area greater than 0.05% that were present in greater amounts in the whisky that had been stored in sherry casks for an addnl. 6 mo. Ten of these compounds were identified by the software with high confidence, two were identified as isomers with close retention indexes, and one was identified interactively. The software identified small differences between the two samples that resulted from sherry cask aging. Because all of the information available from the hard and soft ionization analyses for each compound is summarized in a concise integrated report, the operator can rapidly determine the level of confidence for each assignment and inspect the information for compounds that are not present in the database. The experimental process involved the reaction of Diethyl succinate(cas: 123-25-1).Application of 123-25-1

The Article related to whisky ethyl hexadecanoate phenyl decanoate software gas chromatog hrtofms, Food and Feed Chemistry: Analysis and other aspects.Application of 123-25-1

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

On January 31, 2020, Karimali, Despina; Kosma, Ioanna; Badeka, Anastasia published an article.Product Details of 123-25-1 The title of the article was Varietal classification of red wine samples from four native Greek grape varieties based on volatile compound analysis, color parameters and phenolic composition. And the article contained the following:

Four Greek monovarietal red wines, Agiorgitiko of Nemea, Xinomavro of Naousa, Mavrotragano of Santorini and Fociano of Ikaria, were characterized and classified in terms of volatile and phenolic composition Total phenolic content (TPC) and color parameters were also studied. Forty-four volatile compounds were identified and semi-quantified by head space-solid phase microextraction-gas chromatog./mass spectrometry (HS-SPME-GC/MS) and five phenolic compounds were analyzed using high-performance liquid chromatog. (HPLC-DAD). Concerning the total volatile fraction, Xinomavro showed the highest amount as it was particularly rich in alcs., esters and hydrocarbons, while in the other three wine varieties ranged at lower concentrations Furthermore, Xinomavro and Mavrotragano recorded the highest phenolic content, whereas Fociano recorded the lowest concentrations in both TPC and individual phenolic components. As far as classification results are concerned, the application of statistical anal. (multivariate anal. of variance/linear discriminant anal.-MANOVA/LDA), on volatile compounds resulted in a rather high classification rate (87.5%). Finally, the resp. rates for color and TPC phenolics were also quite satisfactory (75% and 62.5%, resp.). The experimental process involved the reaction of Diethyl succinate(cas: 123-25-1).Product Details of 123-25-1

The Article related to grape red wine classification volatile compound color phenolic composition, Food and Feed Chemistry: Analysis and other aspects.Product Details of 123-25-1

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

On April 7, 2002, Huttenloch, Oliver; Laxman, Eltepu; Waldmann, Herbert published an article.COA of Formula: C19H26N2O3 The title of the article was Combinatorial development of chiral phosphoramidite-ligands for enantioselective conjugate addition reactions. And the article contained the following:

Chiral phosphoramidite ligands embodying bispidine frame work and a binaphthyl phosphoramidite for Cu-catalyzed enantioselective conjugate addition reactions were developed employing principles of combinatorial and solid phase chem. The experimental process involved the reaction of tert-Butyl 7-benzyl-9-oxo-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate(cas: 227940-70-7).COA of Formula: C19H26N2O3

The Article related to combinatorial phosphoramidite ligand enantioselective conjugate addition reaction, Alicyclic Compounds: Cyclohexanes and other aspects.COA of Formula: C19H26N2O3

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

Chen, Zhi-Min; Liu, Jianbo; Guo, Jing-Yao; Loch, Maximillan; DeLuca, Ryan J.; Sigman, Matthew S. published an article in 2019, the title of the article was Palladium-catalyzed enantioselective alkenylation of alkenylbenzene derivatives.Product Details of 10472-24-9 And the article contains the following content:

A regioselective and enantioselective palladium-catalyzed relay Heck alkenylation of alkenylbenzene derivatives to construct remote stereocenters was disclosed. Various β-substituted styrenes were readily obtained in moderate yields with good to excellent levels of enantioselectivity. This strategy provided rapid access to enantioenriched δ, ε, ζ and η-alkenyl aryl compounds from simple starting materials. Mechanistic studies suggested that termination of the relay reaction was controlled by affinity of the arene for the Pd complex during migration. The experimental process involved the reaction of Methyl 2-cyclopentanonecarboxylate(cas: 10472-24-9).Product Details of 10472-24-9

The Article related to alkenylarene alkenyl triflate palladium catalyst regioselective enantioselective heck reaction, Alicyclic Compounds: Cyclohexanes and other aspects.Product Details of 10472-24-9

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

On July 15, 2019, Zhou, Han-Chen; Hou, Zhi-Wei; Wang, De-Xing; Ning, Jing-Ming; Wei, Shu published an article.Formula: C9H11NO2 The title of the article was Large scale preparation, stress analysis, and storage of headspace volatile condensates from Jasminum sambac flowers. And the article contained the following:

In this study, a large-scale preparation of jasmine floral volatile condensate (FVC) was conducted using fresh flowers without any extraction solvent involvement. Condensate volatile profiles were compared to those of fresh flowers for their scent characteristics and ability to withstand manufacturing and storage. The FVC possessed a typical jasmine flower scent, a similar odor polygon shape and greatly enhanced odor intensity and character odorants linalool, indole, and Me anthranilate. In late August and Sept. in Fuzhou, China, the ratio of odor activity values for indole/linalool in FVCs was close to that of fresh flowers, indicating that these were suitable local harvest times for FVC preparation Room temperature storage for 30 mo dramatically reduced the abundance of potent odorants and FVC scent intensity, while cold temperature (4 °C) storage was able to maintain FVC clarity and scent intensity. Our findings should be helpful at improving FVC quantity, quality, and storage. The experimental process involved the reaction of Methyl N-Methylanthranilate(cas: 85-91-6).Formula: C9H11NO2

The Article related to jasminum volatile, floral volatile condensates, jasminum sambac, odor activity value: spme, storage, volatile compounds, Food and Feed Chemistry: Analysis and other aspects.Formula: C9H11NO2

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

Wang, Jianwu; Hang, Yuanxin; Yan, Tingting; Liang, Jiahui; Huang, Zhiqiang; Xu, Huilan published an article in 2018, the title of the article was Qualitative analysis of flavors and fragrances added to tea by using GC-MS.Electric Literature of 85-91-6 And the article contains the following content:

A precise identification method was developed to identify the flavors and fragrances added to tea matrix artificially using gas chromatog. with mass spectrometry and gas chromatog. with quadrupole time-of-flight mass spectrometry. The proposed method was based on the corresponding “three-column retention indexes, two exact mass numbers, one mass spectrum matching degree” database of 40 kinds of common flavors and fragrances. The intraday and the interday relative standard deviation of the retention indexes were less than 0.048 and 0.093%, resp. The accuracy of exact mass was between 0.15 and 6.22 ppm. And the validation of the created database was performed by analyzing the tea samples. Thus, the proposed method is suitable for the precise identification of the flavors and fragrances added to tea matrix artificially without standard substances as a reference The experimental process involved the reaction of Methyl N-Methylanthranilate(cas: 85-91-6).Electric Literature of 85-91-6

The Article related to flavoring fragrance additive tea gc ms, accurate mass, flavors and fragrances, retention index, standard mass spectrum, tea, Food and Feed Chemistry: Analysis and other aspects.Electric Literature of 85-91-6

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

On September 22, 1976, Miki, Tosaku; Ineoka, Mari; Isoda, Yoshiro; Okano, Junji published a patent.COA of Formula: C9H14O3 The title of the patent was Active amino acid. And the patent contained the following:

The methylcyclohexanecarboxylic acids I (R = 1-, 2-, or 3-Me), prepared in 5 steps from the oxo esters II (R1 = Me, Et) via treatment with HOCMe2CN, dehydration, hydrogenation, hydrolysis, and reduction, were isomerized on treating with p-MeC6H4SO3H (III) followed by a weakly basic ion exchange resin. Thus, treating a mixture of cis- and trans-I (R = 1-Me) with III in H2O 1 h at room temperature gave cis-I (R = Me).4-MeC6H4SO3H which was eluted through Amberlite IR-45 (OH form) to give cis-I (R = Me). The experimental process involved the reaction of Methyl 1-methyl-4-oxocyclohexanecarboxylate(cas: 37480-41-4).COA of Formula: C9H14O3

The Article related to methylcyclohexanecarboxylic acid isomerization, aminomethylcyclohexanecarboxylic acid, cyclohexanecarboxylic acid aminomethyl, Alicyclic Compounds: Cyclohexanes and other aspects.COA of Formula: C9H14O3

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

On June 21, 2017, Lytra, Georgia; Franc, Celine; Cameleyre, Margaux; Barbe, Jean-Christophe published an article.Category: esters-buliding-blocks The title of the article was Study of Substituted Ester Formation in Red Wine by the Development of a New Method for Quantitative Determination and Enantiomeric Separation of Their Corresponding Acids. And the article contained the following:

A new method was developed for quantifying substituted acids including, where applicable, their various unexplored enantiomeric forms. A new step was added to acids’ usual quantification methods, consisting of extraction, derivatization to Me esters, and gas chromatog. anal.: preliminary extraction was performed at basic pH to eliminate Et esters, thus avoiding their transesterification during derivatization. Quantitation and enantiomeric distribution of some substituted esters and their corresponding acids were established in 31 com. Bordeaux red wines from 0 to 20 years old. A strong pos. correlation was observed between the age of wine and levels of Et 2-methylpropanoate, Et 3-methylbutanoate, Et 2-methylbutanoate, Et (3R)-3-hydroxybutanoate, both enantiomeric forms of Et 2-hydroxy-3-methylbutanoate, and Et (2S)-2-hydroxy-4-methylpentanoate, but not Et (3S)-3-hydroxybutanoate. However, the standard deviations of average concentrations for the corresponding substituted acids were so large that only few correlations between concentrations and age were observed Concentrations of (2S)-2-hydroxy-3-methylbutanoic acid and (2S)-2-hydroxy-4-methylpentanoic acid increased slightly over time, while (2R)-2-hydroxy-4-methylpentanoic acid levels decreased slightly with the age. Variations in the ratio of substituted Et esters to their corresponding acids over time detected thanks to these anal. advances suggested that, in general, acids were continuously esterified during aging. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).Category: esters-buliding-blocks

The Article related to alkyl acid ester enantiomer red wine extraction gc, chiral substituted acids, chiral substituted esters, enantiomeric distribution, Food and Feed Chemistry: Analysis and other aspects.Category: esters-buliding-blocks

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