Tag: 100-200

Production and recovery of volatile compounds from fermented fruit by-products with Lacticaseibacillus rhamnosus was written by Hadj Saadoun, Jasmine;Ricci, Annalisa;Cirlini, Martina;Bancalari, Elena;Bernini, Valentina;Galaverna, Gianni;Neviani, Erasmo;Lazzi, Camilla. And the article was included in Food and Bioproducts Processing in 2021.Category: esters-buliding-blocks The following contents are mentioned in the article:

In the last years, due to the increasing interest of consumers in natural products, market and industry choices were more directed towards the use of fragrances and flavors obtained from natural sources. Fermentation is a biol. approach helpful to produce diverse aromatic compounds modifying precursors present in raw material, due to a wide array of extracellular enzymes which could be produced by microorganisms. Following this direction Lacticaseibacillus rhamnosus was employed as a starter for melon and orange byproducts fermentation Simple and vacuum distillation were applied for the recovery of the aromatic fraction and compared to identify the more promising in terms of aromatic profile composition Detection and characterization of aromatic compounds were achieved using Head SpaceSolid Phase MicroExtn. Gas Chromatog.-Mass Spectrometry (HS-SPME/GC-MS) approach. Fermentation led to interesting changes, increasing floral, herbal green and fruity notes. Overall, simple distillation allowed the greater recovery of aromatic compounds in terms of concentration for both substrates. This study highlights a possible strategy to produce complex distillates, composed of a mixture of aroma compounds, to be employed as additives in food, feed or perfumery industries as ingredients of natural origin. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Category: esters-buliding-blocks).

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 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. Category: esters-buliding-blocks

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

Production and recovery of volatile compounds from fermented fruit by-products with Lacticaseibacillus rhamnosus was written by Hadj Saadoun, Jasmine;Ricci, Annalisa;Cirlini, Martina;Bancalari, Elena;Bernini, Valentina;Galaverna, Gianni;Neviani, Erasmo;Lazzi, Camilla. And the article was included in Food and Bioproducts Processing in 2021.COA of Formula: C10H20O2 The following contents are mentioned in the article:

In the last years, due to the increasing interest of consumers in natural products, market and industry choices were more directed towards the use of fragrances and flavors obtained from natural sources. Fermentation is a biol. approach helpful to produce diverse aromatic compounds modifying precursors present in raw material, due to a wide array of extracellular enzymes which could be produced by microorganisms. Following this direction Lacticaseibacillus rhamnosus was employed as a starter for melon and orange byproducts fermentation Simple and vacuum distillation were applied for the recovery of the aromatic fraction and compared to identify the more promising in terms of aromatic profile composition Detection and characterization of aromatic compounds were achieved using Head SpaceSolid Phase MicroExtn. Gas Chromatog.-Mass Spectrometry (HS-SPME/GC-MS) approach. Fermentation led to interesting changes, increasing floral, herbal green and fruity notes. Overall, simple distillation allowed the greater recovery of aromatic compounds in terms of concentration for both substrates. This study highlights a possible strategy to produce complex distillates, composed of a mixture of aroma compounds, to be employed as additives in food, feed or perfumery industries as ingredients of natural origin. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1COA of Formula: C10H20O2).

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. 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.COA of Formula: C10H20O2

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

Synthesis, characterization and investigation of the antioxidant activity of some 1,2,4-benzothiadiazine-1,1-dioxides bearing sulfonylthiourea moieties was written by Harrouche, Kamel;Lahouel, Asma;Belghobsi, Mebrouk;Pirotte, Bernard;Khelili, Smail. And the article was included in Canadian Journal of Chemistry in 2019.Application In Synthesis of Isopropylisothiocyanate The following contents are mentioned in the article:

A series of 1,2,4-benzothiadiazine-1,1-dioxides bearing sulfonylthiourea moiety I [R¹ = H, Me, Ph, Bn, 4-MeOC₆H₄; R² = Me, i-Pr, cyclohexyl, Ph] were synthesized, characterized and screened for their antioxidant activity, using six antioxidant anal. assays comparatively to reference compounds, ascorbic acid and quercetin. The results indicated that several compounds I demonstrated strong antioxidant activity in DPPH, ABTS, H₂O₂ and lipid peroxidation assays where some of them were either as active as or more active than reference compounds However, all compounds I were largely less active than references compounds in the reducing power assay. The thiourea moiety probably played a crucial role in antioxidant activity of target compounds I, as a thiolate ion. The most favorable R¹ groups were hydrogen and Me, followed by Ph and benzyl, whereas most favorable R² group was iPr, followed by Ph and Me. The combination of benzothiadiazine ring with sulfonylthiourea moieties led to valuable new antioxidants, which could be used in treatment or prevention of certain diseases or in field of cosmetics, which needed further investigations in future. This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8Application In Synthesis of Isopropylisothiocyanate).

Isopropylisothiocyanate (cas: 2253-73-8) 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.Application In Synthesis of Isopropylisothiocyanate

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

Synthesis, characterization and investigation of the antioxidant activity of some 1,2,4-benzothiadiazine-1,1-dioxides bearing sulfonylthiourea moieties was written by Harrouche, Kamel;Lahouel, Asma;Belghobsi, Mebrouk;Pirotte, Bernard;Khelili, Smail. And the article was included in Canadian Journal of Chemistry in 2019.Computed Properties of C4H7NS The following contents are mentioned in the article:

A series of 1,2,4-benzothiadiazine-1,1-dioxides bearing sulfonylthiourea moiety I [R¹ = H, Me, Ph, Bn, 4-MeOC₆H₄; R² = Me, i-Pr, cyclohexyl, Ph] were synthesized, characterized and screened for their antioxidant activity, using six antioxidant anal. assays comparatively to reference compounds, ascorbic acid and quercetin. The results indicated that several compounds I demonstrated strong antioxidant activity in DPPH, ABTS, H₂O₂ and lipid peroxidation assays where some of them were either as active as or more active than reference compounds However, all compounds I were largely less active than references compounds in the reducing power assay. The thiourea moiety probably played a crucial role in antioxidant activity of target compounds I, as a thiolate ion. The most favorable R¹ groups were hydrogen and Me, followed by Ph and benzyl, whereas most favorable R² group was iPr, followed by Ph and Me. The combination of benzothiadiazine ring with sulfonylthiourea moieties led to valuable new antioxidants, which could be used in treatment or prevention of certain diseases or in field of cosmetics, which needed further investigations in future. 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 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. 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.Computed Properties of C4H7NS

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

Effects of spontaneous fermentation on microbial succession and its correlation with volatile compounds during fermentation of Petit Verdot wine was written by Chen, Hu;Liu, Yaqiong;Chen, Jiawei;Fu, Xiaofang;Suo, Ran;Chitrakar, Bimal;Wang, Jie. And the article was included in LWT–Food Science and Technology in 2022.COA of Formula: C11H22O2 The following contents are mentioned in the article:

Petit Verdot is widely used in blend wines but only few studies focus on the effect of microorganisms on the aroma formation of its monovarietal wine. This study explored the correlation between microorganisms and aromas during spontaneous fermentation (SF) and inoculated fermentation (IF). The changes of volatile compounds and microbial succession during the wine fermentation were monitored by HS-SPME-GC-MS and HTS. The results showed that SF resulted wines with more aromatic and regional characteristics because of significantly higher content and varieties of higher alcs., acetate esters and C6 compounds, thus highlighting the ‘floral’ and ‘fruity’ characteristics of Petit Verdot wine. The PCA and OPLS-DA showed that there were significant differences in aromas and microorganisms under SF, and IF, while correlations between them were established by OPLS and Spearman (VIP >1, P < 0.05). Among them, four unique core bacteria in SF were pos. correlated (P < 0.05) with four important higher alcs. and most of the esters. Non-Saccharomyces in SF were pos. correlated (P < 0.01) with C6 compounds Therefore, SF had a potential application prospect for improving wine flavor and provided a reference for further understanding the role of microorganisms in the formation of aroma compounds This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0COA of Formula: C11H22O2).

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. 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.COA of Formula: C11H22O2

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

Intrinsic role of pH in altering catalyst properties of NiMoP over alumino-silicate for the vapor phase hydrodeoxygenation of methyl heptanoate was written by Ramesh, Arumugam;Tamizhdurai, Perumal;Suthagar, Krishnan;Sureshkumar, Kandhasamy;Theres, Gubert Sonia;Shanthi, Kannan. And the article was included in New Journal of Chemistry in 2019.Formula: C8H16O2 The following contents are mentioned in the article:

Monometallic and bimetallic Ni₂P, MoP, and NiMoP active species were successfully impregnated on thermally stable, high surface area mesoporous alumino-silicate with an Si/Al ratio of 10 at room temperature via a facile wet impregnation method under both acidic and basic conditions using HCl and NH₄OH as pH regulators, resp. Furthermore, the intrinsic role of pH in altering the physicochem. properties of the catalysts was comprehensively evaluated. The catalysts were tested in a high-pressure stainless steel fixed bed reactor at different temperatures ranging from 275-350°, under 10-40 bar hydrogen pressure for the hydrodeoxygenation (HDO) of Me heptanoate. The reaction pathway and product distribution of Me heptanoate were manifested at different temperatures and pressures. The HDO activity and synergistic factor were found to be remarkably higher for the NiMoP/MAS (10)-A catalyst than the NiMoP/MAS (10)-B catalyst and its monometallic counterparts. This investigation proves that the NiMoP/MAS (10)-A catalyst is a promising catalyst for green fuel production from nonedible oils through hydrodeoxygenation. It was also unequivocally confirmed that the catalytic process does not suffer from any mass transfer resistance; thus, making the scaling up of the reaction more feasible. 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. 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.Formula: C8H16O2

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

Water whitening of solvent-cast thermoplastic polyhydroxyether thin films was written by Maples, Austin L.;Ferguson, Richard C.;Williams, Eric B.;Peterson, Robert;Delatte, David E.;Rawlins, James W.. And the article was included in Proceedings of the Annual International Waterborne, High-Solids, and Powder Coatings Symposium in 2018.Product Details of 763-69-9 The following contents are mentioned in the article:

System and conditionally specific water whitening of model epoxy corrosion control coatings were studied using thermoplastic polyhydoxyether films via UV – visible spectroscopy, attenuated total reflectance – fourier transform IR (ATR-FTIR) spectroscopy, differential scanning calorimetry, SEM, and internal stress measurements to quantify the size/spatial and material performance differences between controlled film variables. The void content and the corresponding reduction in light transmission was evaluated of the chem.-same polymers with differing mol. weights, which varied by the residual solvent concentration and composition in the film. Internal stress measurements yielded distinctly different profiles between annealing and exposure cycles and were mol. weight dependent and represent differences in material characteristics possible in all coatings materials. ATR-FTIR was utilized to compare water breakthrough times in relation to both mol. weight and residual solvent content. Greater solvent content resulted in an increase in water whitening and observed void formation and growth within the film. Lower mol. weight polymers exhibited these changes earlier in time, greater size and quantity vs. conditions and to a greater extent than films comprised of higher mol. weight, chem.-same polymers. This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9Product Details of 763-69-9).

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. 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 763-69-9

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

Characterization of Potent Aroma Compounds in Preserved Egg Yolk by Gas Chromatography-Olfactometry, Quantitative Measurements, and Odor Activity Value was written by Zhang, Yu;Liu, Yuping;Yang, Wenxi;Huang, Jia;Liu, Yingqiao;Huang, Mingquan;Sun, Baoguo;Li, Changlin. And the article was included in Journal of Agricultural and Food Chemistry in 2018.HPLC of Formula: 2253-73-8 The following contents are mentioned in the article:

To characterize potent odor-active compounds in preserved egg yolk (PEY), volatile compounds were isolated by headspace solid-phase microextraction and solvent-assisted flavor evaporation Gas chromatog.-olfactometry (GC-O) and gas chromatog.-mass spectrometry (GC-MS) analyses identified a total of 53 odor-active compounds by comparing the odor characteristics, MS data, and retention indexes with those of reference compounds Twenty-seven odorants were detected in at least five isolates that were extracted and analyzed by the same method, and their flavor dilution (FD) factors, ranging from 1 to 2048, were measured by aroma extract dilution anal. (AEDA). To further determine their contribution to the overall aroma profile of PEY, 22 odorants with FD factors ≥16 and GC-MS responses were quantitated, and their odor activity values (OAVs) were calculated According to the OAV results, 19 odorants with OAVs ≥ 1 are the potent odorants that greatly contribute to the characteristic aroma of PEY. Nine compounds were identified for the first time: (E,Z)-2,6-nonadienal, (E)-2-nonenal, 2-methylbutanal, di-Me disulfide, trimethylamine, methional, di-Me trisulfide, diisopropyl disulfide, and di-Et disulfide. This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8HPLC of Formula: 2253-73-8).

Isopropylisothiocyanate (cas: 2253-73-8) 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. 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. HPLC of Formula: 2253-73-8

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

Aquatic Toxicity Assessment of Esters Towards the Daphnia magna Through PCA-ANFIS was written by Asadollahi-Baboli, M.. And the article was included in Bulletin of Environmental Contamination and Toxicology in 2013.COA of Formula: C7H14O3 The following contents are mentioned in the article:

The widespread production of esters combined with their ability to migrate in different compartments, makes their environmental toxicity important. In this background, the multivariate image anal.-quant. structure-toxicity relationship (MIA-QSTR) method coupled to principal component anal.-adaptive neuro-fuzzy inference systems (PCA-ANFIS) was applied to assess the toxicity of esters to Daphnia magna. In MIA-QSTR, pixels of chem. structures (2D images) stand for descriptors, and structural changes account for the variance in toxicities. The ANFIS procedure was capable of correlating the inputs (PCA scores) with the toxicities accurately. The PCA-ANFIS also was statistically validated for its predictive power using cross-validation, applicability domain and Y-scrambling evaluation procedures. The satisfactory results (R_p² = 0.926, Q_LOO² = 0.887, R_L25 %O² = 0.843, RMSE_LOO = 0.320 and RMSE_L25 %O = 0.379) suggests that the QSTR model could be proposed as an alternative method for aquatic toxicity assessment of esters allowing possible application in the European Union regulation REACH. This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9COA of Formula: C7H14O3).

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. 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.COA of Formula: C7H14O3

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

Prediction of flash points of pure organic compounds: Evaluation of the DIPPR database was written by Alibakhshi, A.;Mirshahvalad, H.;Alibakhshi, S.. And the article was included in Process Safety and Environmental Protection in 2017.Electric Literature of C7H14O3 The following contents are mentioned in the article:

The flash point is one of the most important flammability properties of compounds for the design of inherently safe processes. Many models have been developed to predict the flash point using the DIPPR database. However, for only 740 of the 1628 organic compounds available in the DIPPR database, the data for both flash point and normal b.p. were exptl. determined For the other compounds, at least one of these properties was predicted and therefore is not appropriate for model development. The present study introduces a model to predict the flash points of pure organic compounds using their mol. structures and normal b.ps. The new model exploits the equality of the relative errors observed for the normal b.p. and flash point values predicted using the Joback method. Consequently, the relative error of the predicted normal b.ps. can be used as a scaling factor to modify the predicted flash points. The ability of the model to evaluate the accuracy of a database was investigated. The ratio of the relative error of the predicted flash point to the relative error of the predicted normal b.p. obtained using the Joback method was proposed as a measure to evaluate the accuracy of flash point data. This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9Electric Literature of C7H14O3).

Ethyl 3-ethoxypropanoate (cas: 763-69-9) 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 C7H14O3

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