Month: December 2022

Characterization of the Aroma-Active Compounds in Banana (Musa AAA Red green) and Their Contributions to the Enhancement of Sweetness Perception was written by Xiao, Zuobing;Chen, Haiting;Niu, Yunwei;Zhu, Jiancai. And the article was included in Journal of Agricultural and Food Chemistry in 2021.Category: esters-buliding-blocks The following contents are mentioned in the article:

“Hongmeiren” bananas are popular because of their red peel. Two extraction methods solvent-assisted flavor evaporation and headspace solid-phase microextraction, combined with gas chromatog.-olfactometry and gas chromatog.-mass spectrometry (GC-MS), were used to analyze the volatile components of “Hongmeiren” bananas. A total of 86 aroma compounds were identified by GC-MS, 62 of which were identified as the major aroma-active compounds with an odor activity value â‰?1 or modified frequency â‰?30%. Et (E)-2-butenoate, 4-undecanone, and α-phellandrene were found in bananas for the first time. Sensory experiments showed that eight sweet-associated odorants could significantly achieve the sweetness enhancement effect at 30 g/L sucrose solution by odor-induced changes in taste perception. These experiments suggest that selected odorants can achieve sugar reduction, but with consideration of the sugar concentration The study of the sweetness enhancement effect of individual compounds provides a more direct theor. support for sugar reduction in the food industry. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Category: esters-buliding-blocks).

Octyl acetate (cas: 112-14-1) 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.Category: esters-buliding-blocks

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

Characterization of the Aroma-Active Compounds in Banana (Musa AAA Red green) and Their Contributions to the Enhancement of Sweetness Perception was written by Xiao, Zuobing;Chen, Haiting;Niu, Yunwei;Zhu, Jiancai. And the article was included in Journal of Agricultural and Food Chemistry in 2021.Related Products of 2198-61-0 The following contents are mentioned in the article:

“Hongmeiren” bananas are popular because of their red peel. Two extraction methods solvent-assisted flavor evaporation and headspace solid-phase microextraction, combined with gas chromatog.-olfactometry and gas chromatog.-mass spectrometry (GC-MS), were used to analyze the volatile components of “Hongmeiren” bananas. A total of 86 aroma compounds were identified by GC-MS, 62 of which were identified as the major aroma-active compounds with an odor activity value â‰?1 or modified frequency â‰?30%. Et (E)-2-butenoate, 4-undecanone, and α-phellandrene were found in bananas for the first time. Sensory experiments showed that eight sweet-associated odorants could significantly achieve the sweetness enhancement effect at 30 g/L sucrose solution by odor-induced changes in taste perception. These experiments suggest that selected odorants can achieve sugar reduction, but with consideration of the sugar concentration The study of the sweetness enhancement effect of individual compounds provides a more direct theor. support for sugar reduction in the food industry. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Related Products of 2198-61-0).

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. 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.Related Products of 2198-61-0

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

Enantioseparation using chitosan 2-isopropylthiourea-3,6-dicarbamate derivatives as chiral stationary phases for high-performance liquid chromatography was written by Zhang, Lili;Deng, Hongzhong;Wu, Xuepeng;Gao, Hanyuan;Shen, Jun;Cao, Huaqi;Qiao, Yingjie;Okamoto, Yoshio. And the article was included in Journal of Chromatography A in 2020.Formula: C4H7NS The following contents are mentioned in the article:

A new class of chitosan derivatives with an isopropylthiourea at the 2-position and various carbamates at the 3,6-positions of the glucosamine skeleton was synthesized by the selective thiocarbamoylation of the 2-amino group. The chiral stationary phases (CSPs) were then prepared by coating the obtained chitosan 2-isopropylthiourea-3,6-dicarbamate derivatives onto silica gel. The enantioseparation property of the chitosan-based CSPs was assessed with twelve racemates by high-performance liquid chromatog. (HPLC). The CSPs displayed a characteristic enantioseparation power, which seemed to be significantly affected by the 3,6-substituents of the glucosamine unit. The chitosan derivatives with the 3,6-diphenylcarbamate, except for 2-methylphenylcarbamate, possessed higher enantioseparation abilities than those with the 3,6-dicyclohexylcarbamate. Compared to other chitosan derivatives with 2-various substituents and commercialized Chiralcel OD, the chitosan 2-isopropylthiourea derivatives revealed a relatively higher enantioselectivity for some racemic compounds This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8Formula: C4H7NS).

Isopropylisothiocyanate (cas: 2253-73-8) 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.Formula: C4H7NS

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

Enantioseparation using chitosan 2-isopropylthiourea-3,6-dicarbamate derivatives as chiral stationary phases for high-performance liquid chromatography was written by Zhang, Lili;Deng, Hongzhong;Wu, Xuepeng;Gao, Hanyuan;Shen, Jun;Cao, Huaqi;Qiao, Yingjie;Okamoto, Yoshio. And the article was included in Journal of Chromatography A in 2020.Name: Isopropylisothiocyanate The following contents are mentioned in the article:

A new class of chitosan derivatives with an isopropylthiourea at the 2-position and various carbamates at the 3,6-positions of the glucosamine skeleton was synthesized by the selective thiocarbamoylation of the 2-amino group. The chiral stationary phases (CSPs) were then prepared by coating the obtained chitosan 2-isopropylthiourea-3,6-dicarbamate derivatives onto silica gel. The enantioseparation property of the chitosan-based CSPs was assessed with twelve racemates by high-performance liquid chromatog. (HPLC). The CSPs displayed a characteristic enantioseparation power, which seemed to be significantly affected by the 3,6-substituents of the glucosamine unit. The chitosan derivatives with the 3,6-diphenylcarbamate, except for 2-methylphenylcarbamate, possessed higher enantioseparation abilities than those with the 3,6-dicyclohexylcarbamate. Compared to other chitosan derivatives with 2-various substituents and commercialized Chiralcel OD, the chitosan 2-isopropylthiourea derivatives revealed a relatively higher enantioselectivity for some racemic compounds This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8Name: 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.Name: Isopropylisothiocyanate

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

The effects of dietary quercetin supplementation on the meat quality and volatile profile of rabbit meat during chilled storage was written by North, Megan K.;Dalle Zotte, Antonella;Hoffman, Louwrens C.. And the article was included in Meat Science in 2019.Related Products of 106-73-0 The following contents are mentioned in the article:

Thirty-four New Zealand White rabbits of both sexes were fed a control or supplemented (2 g/kg quercetin dihydrate) diet from weaning until slaughter (13 wk). After post-mortem chilling, excised and minced Longissimus thoracis et lumborum muscles were stored at 3.2 °C under oxygen-permeable wrapping for 1, 3 or 5 days. Color, pH, lipid oxidation (TBARS), antioxidant capacity (FRAP), volatile profile (day 1 and 5) and microbial count (day 5) were determined Quercetin reduced alkane (day 5) and hexanal (day 1) concentrations, but otherwise had minimal antioxidant effect, and did not benefit microbial quality, and thus did not substantially improve the shelf-life. The sex effect was similarly limited. Overall, the pH increased and FRAP decreased during storage, but TBARS did not change and discoloration seemed delayed. The volatile profile was dominated by esters, alcs. and heterocyclic compounds, and while it changed during storage, lipid oxidation products did not increase as expected, suggesting that rabbit meat may have relatively active reducing mechanisms. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Related Products of 106-73-0).

Methyl heptanoate (cas: 106-73-0) 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.Related Products of 106-73-0

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

A Comprehensive Evaluation of the Density of Neat Fatty Acids and Esters was written by Knothe, Gerhard;Steidley, Kevin R.. And the article was included in Journal of the American Oil Chemists’ Society in 2014.Quality Control of Methyl nonadecanoate The following contents are mentioned in the article:

D. is one of the most important phys. properties of a chem. compound, affecting numerous applications. An application in the case of fatty acid esters (biodiesel) is that d. is specified in some biodiesel standards In the present work, the d. of fatty acid Me, Et, Pr, and Bu esters as well as triacylglycerols in the C₈-C₂₄ range was determined in the range of 15-40 °C with a densitometer utilizing the oscillating U-tube technique. Literature data on d. are compiled and compared, showing that data for these compounds are incomplete with discrepancies existing in some cases. Besides known effects such as d. decreasing with increasing chain length and increasing saturation, it is shown that trans fatty compounds exhibit lower d. than cis fatty compounds D. data for several saturated odd-numbered, C₁₈, as well as C₂₀ and C₂₂ polyunsaturated fatty esters are reported for the first time. The d. contribution of compounds with high m.ps. is predicted. An equation is given for the calculation of the d. of mixtures 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. 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. 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. Quality Control of Methyl nonadecanoate

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

Identification of Bacillus from Niulanshan Erguotou fermented grain and analysis of flavor compounds in fermentation was written by Yang, Chunxia;Liao, Yonghong;Liu, Junxiong;Hu, Jianhua;Hu, Jiayin;Dou, Shen. And the article was included in Shipin Gongye Keji in 2012.Synthetic Route of C15H22O2 The following contents are mentioned in the article:

Five strains of Bacillus which can produce flavor were screened from Niulanshan Ergoutou fermented grain. Using the sequences anal. of 16S rDNA and phylogenetic tree construction, five strains were identified as Bacillus licheniformis, Bacillus cereus, Bacillus pumilus and Bacillus subtilis. The fermentation broths of five bacillus strains were analyzed by solid phase micro-extraction and chromatog.-mass spectrometry. Removing the compounds of blank, a total of 14 flavor compounds in fermentation broth of Bacillus licheniformis BL-1, 12 flavor compounds in fermentation broth of Bacillus cereus BC-1 and Bacillus pumilus BP-1, 16 flavor compounds in fermentation broth of Bacillus subtilis BS-1, 19 flavor compounds in fermentation broth of Bacillus subtilis BS-2. Except Bacillus pumilus, the fermentation of other four Bacillus strains mainly contained esters compound, and 3-hydroxy-2-butanone was the most important flavor compound However, the fermentation of Bacillus pumilus BP-1 mainly comprised alkynes compound and phenylethyl alc. was the main flavor compound This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Synthetic Route of C15H22O2).

2-Ethylhexyl benzoate (cas: 5444-75-7) 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. 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. Synthetic Route of C15H22O2

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

Direct synthesis of a jet fuel range dicycloalkane by the aqueous phase hydrodeoxygenation of polycarbonate was written by Wang, Lulin;Li, Guangyi;Cong, Yu;Wang, Aiqin;Wang, Xiaodong;Zhang, Tao;Li, Ning. And the article was included in Green Chemistry in 2021.Application of 102-09-0 The following contents are mentioned in the article:

For the first time, propane-2,2-diyldicyclohexane, a jet fuel range C15 dicycloalkane was directly produced by the aqueous phase hydrodeoxygenation (APHDO) of polycarbonate (PC). Among the investigated catalyst systems, the mixture of Rh/C and H-USY (denoted as Rh/C + H-USY) exhibited the best performance. Over it, a high yield of propane-2,2-diyldicyclohexane (94.9%) was achieved from the APHDO of pure PC pellets after a reaction was carried out at 473 K and 3.5 MPa H2 for 12 h. The Rh/C + H-USY catalyst was stable under the investigated conditions. No evident deactivation was observed during three repeated cycles. When we used a chopped DVD disk (a representative of real PC wastes) as the substrate, a high yield (86.9%) of propane-2,2-diyldicyclohexane was obtained under the same reaction conditions. The propane-2,2-diyldicyclohexane as obtained had a high d. (0.92 g mL^-1) and a high volumetric net heat of combustion (39.6 MJ L^-1). As a potential application, it can be blended into jet fuels to improve the range and payload of airplanes. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Application of 102-09-0).

Diphenyl carbonate (cas: 102-09-0) 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. 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. Application of 102-09-0

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

Stereoselective synthesis of (E)-, (E,Z)- and (E,E)-conjugated dienes via alkylation of 3-sulfolenes as key step was written by Yamada, Sachiko;Ohsawa, Hideto;Suzuki, Takayoshi;Takayama, Hiroaki. And the article was included in Chemistry Letters in 1983.Product Details of 50767-78-7 The following contents are mentioned in the article:

Alkylation of 3-sulfolene in the presence of (Me₃Si)₂NLi gave 40-65% I [R = Bu, Me, Et, heptyl, isoamyl, (CH₂)₃CO₂CMe₃, tetrahydropyranyloxyoctyl (R²), tetrahydropyranyloxyheptyl (R³), CH₂Ph, R¹ = H]. Alkylation of I (R = Bu, heptyl, R³, R¹ = H) gave 55-71% trans–I (R¹ = Bu, heptyl, Me) together with 1-9% of the corresponding cis–I. Thermolysis of trans–I in octane gave (E,Z)-R¹CH:CHCH:CHR, whereas in EtOH in the presence of base (E,E)-R¹CH:CHCH:CHR were obtained quant. Ether cleavage of I (R = R², R¹ = H; R = R³, R¹ = Me), followed by thermolysis, gave (E)-CH₂:CHCH:CH(CH₂)₈OAc and (E,E)-MeCH:CHCH:CH(CH₂)₇OH resp. This study involved multiple reactions and reactants, such as (E)-Dodeca-9,11-dien-1-yl acetate (cas: 50767-78-7Product Details of 50767-78-7).

(E)-Dodeca-9,11-dien-1-yl acetate (cas: 50767-78-7) 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. 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.Product Details of 50767-78-7

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

Property of alkyltri(oxyethyl) β-D-glucopyranosides was written by Fan, Yulin;Fu, Fang;Chen, Langqiu;Li, Jiping;Zhang, Jing;Zhang, Guochao;Liao, Jingyi. And the article was included in Journal of Molecular Liquids in 2021.Electric Literature of C16H22O11 The following contents are mentioned in the article:

Based on reconstructing conventional alkyl β-D-glucopyranosides, alkyltri(oxyethyl) β-D-glucopyranosides (4a-4h, n = 6-16) were prepared by introducing a tri(oxyethyl) group ((-OCH₂CH₂-)₃) as a hydrophilic spacer to improve effectively the related water solubility Their foaming performance, emulsifying property, hygroscopicity, solubility, and thermotropic phase transitions were further investigated. The exptl. results showed that the phase transition temperature (T_iso) increased with increasing their alkyl chain length. Such β-D-glucopyranosides (4b-4h, n = 7-16) showed a smectic focal conic-shaped texture. Their water solubility, surface tension, CMC value, and hygroscopicity decreased with increasing their alkyl chain length. Meanwhile, 4e (n = 10) had the best foamability. In the rapeseed oil/water system, 4f (n = 12) had excellent emulsifying property. Furthermore, 4 (n = 8, 10, 12) and SDS or CTAC had the synergistic effect because their exptl. CMC value was smaller than their ideal CMC value (CMC^id). This study involved multiple reactions and reactants, such as (2S,3R,4S,5R,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 604-69-3Electric Literature of C16H22O11).

(2S,3R,4S,5R,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 604-69-3) 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. 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.Electric Literature of C16H22O11

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