Tag: 100-200

Volatile and non-volatile metabolite changes in 140-day stored vacuum packaged chilled beef and potential shelf life markers was written by Frank, Damian;Hughes, Joanne;Piyasiri, Udayasika;Zhang, Yimin;Kaur, Mandeep;Li, Yutao;Mellor, Glen;Stark, Janet. And the article was included in Meat Science in 2020.Application In Synthesis of Methyl heptanoate The following contents are mentioned in the article:

During storage of vacuum packaged chilled beef (VPCB), lactic acid bacteria become the dominant microflora, facilitating an extended shelf life. However, at some point, (bio)chem. and organoleptic changes render the meat unacceptable. In this investigation we evaluated volatile and non-volatile metabolite changes in VPCB after 84-, 98-, 120- and 140-days storage at �- 1°C. After 140-days storage, the sensory, volatile and non-volatile data did not indicate spoilage. Minimal changes in volatile signatures of collected weep and on raw and grilled steaks were measured. Changes in selected non-volatile components indicated increased proteolysis (free amino acids, carnosine) and changes in organic acids (lactic, succinic) and nucleotide metabolism Rapid volatile profiling using proton transfer reaction mass spectrometry showed a clear progression of changes in selected compounds over the storage period. An increased concentration of ethanol and other compounds between 120 and 140 days, suggested that volatile changes may be a useful objective indicator of extended storage VPCB quality. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Application In Synthesis of Methyl heptanoate).

Methyl heptanoate (cas: 106-73-0) 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.Application In Synthesis of Methyl heptanoate

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

In vitro human colonic fermentation of indigestible fraction isolated from lunch menus: impact on the gut metabolites and antioxidant capacity was written by Zamora-Gasga, Victor Manuel;Cardenas-Castro, Alicia Paulina;Montalvo-Gonzalez, Efigenia;Loarca-Pina, Maria Guadalupe Flavia;Pedro Alberto, Vazquez-Landaverde;Tovar, Juscelino;Sayago-Ayerdi, Sonia Guadalupe. And the article was included in International Journal of Food Sciences and Nutrition in 2018.Computed Properties of C8H16O2 The following contents are mentioned in the article:

The indigestible fraction (IF) isolated from three lunch menus: Modified Mexican Lunch (MM-L), Traditional Mexican Lunch (TM-L) and Alternative Mexican Lunch (AM-L), was studied in terms of antioxidant capacity (AOX) and metabolites produced through fermentation by human intestinal microbiota. IFs were isolated after withstanding in vitro gastrointestinal digestion and total soluble polyphenols (TSP), condensed tannins (CT), hydrolysable polyphenols (HP) and AOX (DPPH, FRAP) were evaluated. AOX, pH and bacterial metabolites profile changes were also monitored during in vitro colonic fermentation Lunch menus showed differences in IF, TSP, CT and FRAP values (p<.05). TM-L had the highest TSP and CT contents (0.84 and 1.89 g/100 g DW, resp.). Changes in pH and AOX during fermentation were time-dependent and substrate-dependent (p<.05). Butyric acid production was not significantly modified by the IFs (p>.05). Fifty-seven microbiota-produced volatile compounds were detected by SPME-GC-MS. This study shows the potential effects of food habits on bacterial metabolite production This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Computed Properties of C8H16O2).

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

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

Isolation, characterization and biological potential of compounds from flowers of Moringa oleifera was written by Punia, Jyoti;Singh, Rajvir. And the article was included in Journal of the Indian Chemical Society in 2018.Product Details of 106-73-0 The following contents are mentioned in the article:

A phytochem. study of methanolic extract obtained from flowers of Moringa oleifera led to the isolation of seven compounds viz. Me heptanoate, beta-sitosterone, 3,7,11,15-tetramethyl-2-headecen-1-ol, 24-methylene-9,19-cyclolanostan-3-ol and nonacosan-15-one, heneicosanoic acid and Et geranyl acetate. Characterization of these isolated compounds was done by using ¹H NMR, FT-IR, LC-MS and GC-MS. Different solvent fractions were also investigated for total phenolics content, total flavonoids content, total alkaloids content, minerals, DPPH free radical scavenging activity and antifungal activity. Correlation between various phytochems. and antioxidant activity was also calculated at p < 0.01 significant level. A pos. and significant correlation was found between phenols, flavonoids and DPPH free radical scavenging activity. The results of this study revealed that Moringa oleifera flowers can be explored as a potent source of antioxidants in nutritional food supplements. They also possessed promising antifungal activity against Rhizoctonia solani and Fusarium oxysporum. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Product Details of 106-73-0).

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

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

Evaluation of the physiochemical and aromatic qualities of pickled Chinese pepper (Paojiao) and their influence on consumer acceptability by using targeted and untargeted multivariate approaches was written by Ye, Zi;Shang, Zhixun;Li, Meiqi;Qu, Yonghan;Long, Hongjin;Yi, Junjie. And the article was included in Food Research International in 2020.Recommanded Product: 2198-61-0 The following contents are mentioned in the article:

Paojiao, which is traditionally pickled Chinese chili peppers (Capsicum frutescens Linn.), possesses unique flavors. This study was conducted to investigate the flavor, mouthfeel, and consumer acceptability of Paojiao. The quality of six homemade and two industrial Paojiao samples were evaluated by integrating untargeted (to fingerprint volatile fraction) and targeted (to analyze free amino acids or FAAs, capsaicinoids, and texture) approaches. Furthermore, multivariate data anal. (MVDA) was applied to identify the quality characteristics that drive the consumer acceptability for Paojiao. As for the targeted quality, hardness (1.30-10.52 N) and capsaicin (2.22-3.84 mg/g) varied with different samples. The main taste-active FAAs in Paojiao were detected. A total of 127 volatiles were observed, and esters were the major components. Based on sensory anal., the homemade samples received higher acceptability than the industrial samples. MVDA demonstrated that some key volatiles, taste-active FAAs, and chewiness were the discriminant quality attributes affecting consumer acceptability. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Recommanded Product: 2198-61-0).

Isopentyl hexanoate (cas: 2198-61-0) 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. 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: 2198-61-0

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

Use of Dithiasuccinoyl-Caged Amines Enables COS/H₂S Release Lacking Electrophilic Byproducts was written by Cerda, Matthew M.;Mancuso, Jenna L.;Mullen, Emma J.;Hendon, Christopher H.;Pluth, Michael D.. And the article was included in Chemistry – A European Journal in 2020.Computed Properties of C4H7NS The following contents are mentioned in the article:

The enzymic conversion of carbonyl sulfide (COS) to hydrogen sulfide (H₂S) by carbonic anhydrase has been used to develop self-immolating thiocarbamates as COS-based H₂S donors to further elucidate the impact of reactive sulfur species in biol. The high modularity of this approach has provided a library of COS-based H₂S donors that can be activated by specific stimuli. A common limitation, however, is that many such donors result in the formation of an electrophilic quinone methide byproduct during donor activation. As a mild alternative, we demonstrate here that dithiasuccinoyl groups can function as COS/H₂S donor motifs, and that these groups release two equivalent of COS/H₂S and uncage an amine payload under physiol. relevant conditions. Addnl., we demonstrate that COS/H₂S release from this donor motif can be altered by electronic modulation and alkyl substitution. These insights are further supported by DFT investigations, which reveal that aryl and alkyl thiocarbamates release COS with significantly different activation energies. This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8Computed Properties of C4H7NS).

Isopropylisothiocyanate (cas: 2253-73-8) 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.Computed Properties of C4H7NS

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

Perceived aroma characteristic of Tsingtao beer in relation to wort gravity was written by Yu, Haiyan;Xie, Jingru;Xie, Tong;Guo, Wei;Chen, Chen;Tian, Huaixiang. And the article was included in European Food Research and Technology in 2021.Related Products of 112-14-1 The following contents are mentioned in the article:

To investigate the impacts of wort gravity on perceived aroma characteristic of Tsingtao beer, sensory-directed flavor approaches, including sensory quant. descriptive anal. (QDA), gas chromatog.-mass spectrometry (GC-MS), gas chromatog.-olfactometry (GC-O), and aroma recombination experiments were employed. The result of QDA revealed that the aroma intensities of Tsingtao beer varied with the wort gravity. GC-MS determined 50 volatile compounds in all from the four kinds of Tsingtao beer samples with different wort gravity. Concentrations of most compounds were pos. correlated with beer wort gravity. Then 39 aroma-active compounds in the four beer samples were identified by GC-O, and 33 of them were found exited in Y4 sample with the highest wort gravity. The aroma recombination experiments showed that aroma-active compounds with AI �1 (GC-O detected) could simulate the aroma profile, indicating these compounds were aroma perceived compounds There were 16, 17, 19 and 23 aroma perceived compounds in the four kinds of samples, resp., indicating Y4 had the most abundant aroma perceived compounds This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Related Products of 112-14-1).

Octyl acetate (cas: 112-14-1) 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. 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 112-14-1

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

Impact of crossflow microfiltration on aroma and sensory profiles of a potential functional citrus-based food was written by Hammad, Imane;Dornier, Manuel;Lebrun, Marc;Maraval, Isabelle;Poucheret, Patrick;Dhuique-Mayer, Claudie. And the article was included in Journal of the Science of Food and Agriculture in 2022.Related Products of 112-14-1 The following contents are mentioned in the article:

Citrus juices can be cold-concentrated by crossflow microfiltration (CMF) in order to obtain functional foods enriched in carotenoids, flavonoids and pectins. The work aimed to characterize the organoleptic quality of this type of micronutrient-dense foods through their aroma profile and sensory anal. Two citrus concentrates with and without a diafiltration step were compared. Both citrus products were very different, linked to aroma compound, sugar and organic acid contents. Due to its sugar/acidity balance and its better aromatic profile responsible for the citrus-floral flavor, the concentrate without diafiltration was preferred by the sensory panel. Thanks to a simple transfer model, we showed that retention of volatiles clearly varied from one aroma compound to another. The terpene hydrocarbons were the most retained by the membrane during CMF, probably because they were strongly associated with insoluble solids by adsorption. Even though the process modified their organoleptic profiles, both citrus-based products were well rated and can be consumed directly as pleasant functional drinks. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Related Products of 112-14-1).

Octyl acetate (cas: 112-14-1) 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. 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 112-14-1

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

Vintage analysis of Chinese Baijiu by GC and ¹H NMR combined with multivariable analysis was written by Li, Yicong;Fan, Shuangxi;Li, Anjun;Liu, Guoying;Lu, Wei;Yang, Bo;Wang, Fengxian;Zhang, Xin;Gao, Xiaojuan;Lu, Zhiyuan;Su, Ning;Wang, Guanghao;Liu, Yinuo;Ji, Xin;Xin, Peng;Li, Guohui;Wang, Daobing;Lu, Fuping;Zhong, Qiding. And the article was included in Food Chemistry in 2021.Electric Literature of C11H22O2 The following contents are mentioned in the article:

Economical-driven counterfeit and inferior aged Chinese Baijiu has caused serious concern of publicity in China. In this study, a total of 167 authentic Chinese Baijiu samples with different vintages including 3 flavor types were carefully collected. Gas chromatog. (GC) was used to determine main volatile components and proton NMR (1H NMR) spectroscopy was employed to obtain non-targeted fingerprints of Chinese Baijiu samples. Partial least squares regression (PLSR) models, which were confirmed by internal and external validation, were established for effectively identifying actual storage vintage of Chinese Baijiu with various brands, flavor types. Centering (Ctr), pareto scaling (Par), unit variance scaling (UV) data pretreatment methods, principal components (PCs), and three modified variable selection methods were proposed to successfully optimize the vintage model and effectively extract important vintage characteristic factors. This study demonstrated that NMR and GC combined with multivariate statistical anal. are effective tools for validating vintage authenticity of Chinese Baijiu. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Electric Literature of C11H22O2).

Isopentyl hexanoate (cas: 2198-61-0) 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.Electric Literature of C11H22O2

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

Systematic screening of bifunctional ionic liquid for intensifying esterification of methyl heptanoate in the reactive extraction process was written by Wang, Ruizhuan;Chen, Guzhong;Qin, Hao;Cheng, Hongye;Chen, Lifang;Qi, Zhiwen. And the article was included in Chemical Engineering Science in 2021.Safety of Methyl heptanoate The following contents are mentioned in the article:

For long-chain ester formation, reactive extraction intensified by a bifunctional solvent is a proper process concept as the product ester is usually not soluble in water. To screen a bifunctional ionic liquid (IL), both extraction performance and catalytic activity are considered, taking esterification of methanol and heptanoic acid as example. Based on solute-in-IL infinite dilution activity coefficient generated from DNN-based recommender system, infinite dilution selectivity between product and reactant in ILs is adopted to evaluate extraction performance. The acid dissociation constant (pKa) obtained by quantum chem. calculation is used to evaluate the catalytic activity of ILs. The screened IL, 1-propyl-2,3-dimethylimidazol-3-ium hydrogen sulfate ([IM-3,1,1][HSO₄]), has a high infinite dilution selectivity of 710.77 and pKa of 5.81. Both UNIFAC-IL calculation and exptl. validation are performed to examine phase splitting and reaction results. The screened IL gives higher ester yield and ester phase purity than the most commonly used bifunctional IL [BMIM][HSO₄]. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Safety of Methyl heptanoate).

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.Safety of Methyl heptanoate

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

A new Bronsted acid MIL-101(Cr) catalyst by tandem post-functionalization; synthesis and its catalytic application was written by Mortazavi, Saeideh-Sadat;Abbasi, Alireza;Masteri-Farahani, Majid. And the article was included in Applied Organometallic Chemistry in 2020.Related Products of 112-14-1 The following contents are mentioned in the article:

A new heterogeneous Bronsted solid acid catalyst was prepared by tandem post-functionalization of MIL-101(Cr) and utilized for acetic acid esterification and alcoholysis of epoxides under solvent-free conditions. First, MIL-101(Cr) was functionalized with pyrazine to achieve MIL-101(Cr)-Pyz. Afterwards, the nucleophilic reaction of MIL-101(Cr)-Pyz with 1,3-propane sultone and next acidification with diluted sulfuric acid gave MIL-101(Cr)-Pyz-RSO₃H Bronsted solid acid catalyst. Various characterization methods such as Fourier transformation IR (FT-IR) spectroscopy, X-ray diffraction (XRD), elemental anal. (CHNS), XPS, SEM (SEM), energy-dispersive X-ray (EDX) spectroscopy, thermal anal. (TGA/DTA), acid-base titration, and N₂ adsorption/desorption anal. were employed to fully characterize the prepared catalyst. The catalyst showed high activity compared to unmodified MIL-101(Cr) in both catalytic acetic acid esterification and alcoholysis of epoxides. It can also be readily isolated from the reaction mixture and reused three times without major decrease in its activity. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Related Products of 112-14-1).

Octyl acetate (cas: 112-14-1) 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. 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. Related Products of 112-14-1

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