Tag: 100-200

Analysis of microbial community structure and volatile compounds in pit mud used for manufacturing Taorong-type Baijiu based on high-throughput sequencing was written by Liu, Yanbo;Sun, Mengxiao;Hou, Pei;Wang, Wenya;Shen, Xiangkun;Zhang, Lixin;Han, Suna;Pan, Chunmei. And the article was included in Scientific Reports in 2022.Application In Synthesis of Isopentyl hexanoate The following contents are mentioned in the article:

In this study, the pit mud used in manufacturing Taorong-type Baijiu was collected from the upper, middle, lower and bottom layers of pits at Henan Yangshao Liquor Co., LTD. High-throughput sequencing (HTS) technol. was used to analyze the microbial community structure of the pit mud. In addition, the volatile compounds in the pit mud were subjected to preliminary qual. anal. through headspace-solid phase microextraction and gas chromatog.-mass spectrometry (GC-MS). The HTS results demonstrated that there were 5, 3, 5 and 5 dominant bacterial phyla (including 11, 11, 9 and 8 dominant bacterial genera) and 3, 3, 3 and 3 dominant fungal phyla (including 4, 7, 7 and 5 dominant fungal genera) in the pit mud from the F-S (upper), G-Z (middle), H-X (lower) and I-D (bottom) layers, resp. In the qual. anal. of the volatile compounds, a total of 77types of volatile compounds were detected in the pit mud, including 46, 45, 39 and 49 types in the pit mud from layers F-S, G-Z, H-X and I-D, resp. Esters and acids were the two main components of the pit mud. The correlation between the microorganisms present and the main volatile compounds in the pit mud was analyzed. Lentimicrobium, Syner-01 and Blvii28_wastewater-sludge groups were found for the first time in pit mud used for manufacturing Taorong-type Baijiu. The findings of this study could provide a theor. foundation for improving the quality of pit mud and the flavor of Taorong-type Baijiu. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Application In Synthesis of Isopentyl hexanoate).

Isopentyl hexanoate (cas: 2198-61-0) 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. 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.Application In Synthesis of Isopentyl hexanoate

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

Polyimide Polymer Glass-Free Capillary Columns for Gas Chromatography was written by Webster, Jackie G.;Marine, Susan S.;Danielson, Neil D.. And the article was included in Journal of Chromatographic Science in 2011.Safety of Ethyl 3-ethoxypropanoate The following contents are mentioned in the article:

Polymeric polyimide capillary tubing, both uncoated and coated with stationary phases of two polarities, is explored for use as capillary columns for gas chromatog. (GC). These glass-free polyimide columns are flexible and their small winding diameter of less than a cm around a solid support makes them compatible for potential use in portable GC instruments. Polyimide columns with dimensions of 0.32 mm internal diameter × 3 m are cleaned, annealed at 300°, and coated using the static method with phenylmethylsilicone (PMS). Separations of volatile organics were studied isothermally on duplicate sets of polyimide columns by GC with a flame ionization detector using split injection. Unlike the uncoated ones, the coated polyimide columns successfully sep. Grob test mix classes of alkanes, amines, and fatty acid Me esters. The relative standard deviations for retention time and peak area are 0.5 and 2.5 , resp. With the 3 m PMS-coated column connected to a retention gap to permit operation at its optimum flow rate of 30 cm/s, a plate count of 3200 or plate height of 1 mm is possible. Lack of retention and tailing peaks are evident for the polyimide polymer capillary columns as compared to that of a 3 m com. cross-linked PMS fused silica capillary. However, headspace analyses of an aromatic hydrocarbon mix and a Clearcoat automotive paint sample are viable applications on the PMS polyimide polymer column. (c) 2011 Preston Publications. This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9Safety of Ethyl 3-ethoxypropanoate).

Ethyl 3-ethoxypropanoate (cas: 763-69-9) 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.Safety of Ethyl 3-ethoxypropanoate

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

Volatile Variation Theobroma cacao Malvaceae L. Beans Cultivated in Taiwan Affected by Processing via Fermentation and Roasting was written by Lin, Li-Yun;Chen, Kwei-Fan;Changchien, Lin-Ling;Chen, Kuan-Chou;Peng, Robert Y.. And the article was included in Molecules in 2022.Synthetic Route of C11H22O2 The following contents are mentioned in the article:

After being harvested, cacao beans are usually subjected to very complex processes in order to improve their chem. and phys. characteristics, like tastefulness with chocolate characteristic flavors. The traditional process consists of three major processing stages: fermentation, drying, and roasting, while most of the fermentation is carried out by an on-farm in-box process. In Taiwan, we have two major cocoa beans, the red and the yellow. We proposed that the major factor affecting the variation in tastes and colors in the finished cocoa might be the difference between cultivars. To uncover this, we examined the effect of the three major processes including fermentation, drying and roasting on these two cocoa beans. Results indicated that the two cultivars really behaved differently (despite before or after processing with fermentation, drying, and roasting) with respect to the patterns of fatty acids (palmitic, stearic, oleic, and arachidonic); triacylglycerols:1,2,3-trioleoyl-glycerol (OOO); 1-stearoyl-2,3-oleoyl-glycerol (SOO); 1-stearoyl-sn-2-oleoyl-3-arachidoyl- glycerol (SOA); 1,3-distearyol-sn-2-oleoyl-glycerol (SOS); organic acids (citric, tartaric, acetic, and malic); soluble sugars (glucose and fructose); amino acids; total phenolics; total flavonoids; and volatiles. Our findings suggest that to choose specific processing conditions for each specific cocoa genotype is the crucial point of processing cocoa with consistent taste and color. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Synthetic Route of C11H22O2).

Isopentyl hexanoate (cas: 2198-61-0) 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. 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.Synthetic Route of C11H22O2

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

The potential correlation between bacterial diversity and the characteristic volatile flavour of traditional dry sausages from Northeast China was written by Hu, Yingying;Zhang, Lang;Liu, Qian;Wang, Yan;Chen, Qian;Kong, Baohua. And the article was included in Food Microbiology in 2020.Recommanded Product: Isopentyl hexanoate The following contents are mentioned in the article:

The objective of this study was to explore the correlation between bacterial communities and volatile compounds in traditional dry sausages from different regions in Northeast China. The bacterial community structure of dry sausages from five different regions as determined by high-throughput sequencing technol. demonstrated that Firmicutes and Proteobacteria were the predominant phyla; Lactobacillus, Staphylococcus, Leuconostoc, Lactococcus and Weissella were the predominant genera; and Staphylococcus xylosus, Lactobacillus sakei, Weissella hellenica, Leuconostoc citreum, Lactococcus raffinolactis and Lactobacillus plantarum were the predominant species. Meanwhile, a total of 120 volatile compounds were detected in sausages from five different regions and mainly included alcs., acids, aldehydes, ketones, esters and terpenes. Furthermore, the potential correlations between the core bacteria and major volatile compounds (64) were explored based on Spearman’s correlation anal. Pos. correlations were found between W. hellenica, Lb. sakei, Lactococcus lactis, Lactobacillus alimentarius, Lb. plantarum and carboxylic acids and alcs. Lc. lactis, Lb. alimentarius and Lb. plantarum were associated with the production of most esters, aldehydes and ketones. This study provides a deep insight into the relationship between the bacterial community and the volatile flavor profile of dry sausages, which may be helpful for the production of fermented dry sausages. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Recommanded Product: Isopentyl hexanoate).

Isopentyl hexanoate (cas: 2198-61-0) 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. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Recommanded Product: Isopentyl hexanoate

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

The potential correlation between bacterial diversity and the characteristic volatile flavour of traditional dry sausages from Northeast China was written by Hu, Yingying;Zhang, Lang;Liu, Qian;Wang, Yan;Chen, Qian;Kong, Baohua. And the article was included in Food Microbiology in 2020.Related Products of 106-73-0 The following contents are mentioned in the article:

The objective of this study was to explore the correlation between bacterial communities and volatile compounds in traditional dry sausages from different regions in Northeast China. The bacterial community structure of dry sausages from five different regions as determined by high-throughput sequencing technol. demonstrated that Firmicutes and Proteobacteria were the predominant phyla; Lactobacillus, Staphylococcus, Leuconostoc, Lactococcus and Weissella were the predominant genera; and Staphylococcus xylosus, Lactobacillus sakei, Weissella hellenica, Leuconostoc citreum, Lactococcus raffinolactis and Lactobacillus plantarum were the predominant species. Meanwhile, a total of 120 volatile compounds were detected in sausages from five different regions and mainly included alcs., acids, aldehydes, ketones, esters and terpenes. Furthermore, the potential correlations between the core bacteria and major volatile compounds (64) were explored based on Spearman’s correlation anal. Pos. correlations were found between W. hellenica, Lb. sakei, Lactococcus lactis, Lactobacillus alimentarius, Lb. plantarum and carboxylic acids and alcs. Lc. lactis, Lb. alimentarius and Lb. plantarum were associated with the production of most esters, aldehydes and ketones. This study provides a deep insight into the relationship between the bacterial community and the volatile flavor profile of dry sausages, which may be helpful for the production of fermented dry sausages. 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. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Related Products of 106-73-0

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

Biocontrol ability and action mechanisms of Aureobasidium pullulans GE17 and Meyerozyma guilliermondii KL3 against Penicillium digitatum DSM2750 and Penicillium expansum DSM62841 causing postharvest diseases was written by Agirman, Bilal;Erten, Huseyin. And the article was included in Yeast in 2020.Application In Synthesis of Isopentyl hexanoate The following contents are mentioned in the article:

Epiphytic yeasts were isolated from different cultivars of apples and lemons and identified by a combination of PCR-RFLP of 5.8S rRNA region and sequencing of D1/D2 domain of the 26S rRNA gene. Among 69 isolates, Aureobasidium pullulans GE17 and Meyerozyma guilliermondii KL3 strains showed the greatest antagonistic activity against two significant apple and lemon postharvest pathogens, Penicillium expansum DSM62841 (blue mold) and Penicillium digitatum DSM2750 (green mold), after preliminary screening. Yeasts were applied as single and mixed cultures with two different cell concentrations of 10⁶ and 10⁸ cells/mL in the present study. It was determined that antagonistic activity of two yeast strains studied emerged with a combination of several mechanisms of action including competition for space and nutrients, production of volatile. Otherwise, the application of mixed culture at the ratio of 10⁸ cells/mL inhibited spore germination of both pathogens from 86% to 95%. Results of this study suggest that an increase in yeast cell concentrations pos. affected their biocontrol activity against blue and green molds. According to the results, employing single culture of M. guilliermondii KL3 did not exhibit effective antagonistic activity against blue and green molds. However, utilization of A. pullulans GE17 alone and mixed culture showed succesfull controlling against both P. expansum DSM62841 and P. digitatum DSM2750. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Application In Synthesis of Isopentyl hexanoate).

Isopentyl hexanoate (cas: 2198-61-0) 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.Application In Synthesis of Isopentyl hexanoate

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

Utilization of generalized energy-based fragmentation method on the study of hydrogen abstraction reactions of large methyl esters was written by Chi, Yawei;You, Xiaoqing;Zhang, Lidong;Li, Wei. And the article was included in Combustion and Flame in 2018.COA of Formula: C8H16O2 The following contents are mentioned in the article:

Accurate reaction energies and barrier heights are essential for the construction of reliable combustion kinetics models of various fuels. Nevertheless, the computational cost for electronic energy calculations using high-level ab initio methods increases dramatically with the size of mols. A solution to this problem is to utilize a generalized energy-based fragmentation (GEBF) approach, as it has been found to be effective in reducing the scaling of the computational cost in calculation of energetics and other mol. properties for many large mols., clusters, and crystals with various quantum chem. methods. This work attempts to apply this GEBF approach in the study of one important type of reactions of large Me esters, i.e., the hydrogen abstraction reactions by hydrogen atoms. The energies of stationary points on the potential energy surfaces were examined using both conventional quantum chem. methods and the GEBF method at the QCISD(T)/CBS// M06-2X/6-311+ + g(d,p) level for C_nH_2n+1COOCH₃ (n = 4, 5) + H reactions. The results show that the unsigned energy deviation of the GEBF method from the conventional method is less than 0.1 kcal/mol, while the computational time is greatly reduced, e.g. up to 90% at the QCISD(T)/cc-pVTZ level. Based on the quantum chem. calculations, rate constants of the hydrogen abstraction reactions of C_nH_2n+1COOCH₃ (n = 4, 5, 8) by H atoms were computed. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0COA of Formula: C8H16O2).

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

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

Studies of the uptake of gaseous ethyl-3-ethoxy propionate onto ammonium sulfate and ammonium nitrate aerosol particles was written by Stewart, K. D.;Andino, J. M.. And the article was included in WIT Transactions on Ecology and the Environment in 2005.Related Products of 763-69-9 The following contents are mentioned in the article:

Understanding the heterogeneous (gas-particle) interactions that occur in the troposphere is of seminal importance for modelers that assess the atm. fates and transport of gases. One means of understanding these interactions is to calculate the mass uptake coefficient of a gaseous species onto common anthropogenic aerosols via an exptl. means. The effective uptake behavior of gaseous Et -3-Ethoxy Propionate (E3EP) onto ammonium sulfate and ammonium nitrate aerosols of varying total surface areas was studied using a custom manufactured flow system. E3EP is an organic species that is commonly found in paint and paint products. Ammonium sulfate and ammonium nitrate aerosols were studied because of their abundance in the troposphere. Gas phase E3EP concentrations were obtained using a solid phase microextraction technique (SPME) coupled to a gas chromatograph with a flame ionization detector (GC-FID). Analyses of the ammonium sulfate and ammonium nitrate aerosols were carried out using a Scanning Mobility Particle Sizing system (SMPS). As expected, losses of gaseous E3EP onto the aerosol surfaces decreased with decreasing initial surface area. The calculated initial effective uptake coefficients were shown to vary, depending on aerosol composition Due to the lack of published literature data regarding the heterogeneous interactions of organic species in the troposphere, these studies provide a significant enhancement to the overall knowledge base. This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9Related Products of 763-69-9).

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

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

Prediction of split injection strategy assisted diesel engine combustion, performance and emission characteristics fuelled waste frying oil methyl ester through central composite design was written by Dharmalingam, Babu;Deepakkumar, R.;Bhattacharya, Kasturi;Paulraj Gundupalli, Marttin;Sriariyanun, Malinee. And the article was included in Materials Today: Proceedings.Formula: C8H16O2 The following contents are mentioned in the article:

The objective of this study is to use response surface methodol. to forecast the performance, combustion, and emission characteristics of an advanced injection strategy-assisted diesel engine running on waste frying oil Me ester. The experiment was carried out on a diesel engine using a high-pressure fuel injection system. The main injection timing ranges varied from 16 to 24 °CA bTDC, whereas the post-injection ranges from -6 °CA bTDC to 6 °CA aTDC. The injection quantity for the main and post injections quantity varied from 70 % to 90 %, 10 % to 30 %, and the injection pressure is set at 500 bar. Experiments were carried out using a design matrix developed by the design of experiments At 100 % load, B100-90 %-10 % obtained the highest BTE of 33.87 % and the lowest fuel consumption of 0.268 kg/kW-hr. At the main injection timing of 22 °CA and post-injection timing of -4 °CA, D100-80 %-20 % achieved the lowest unburned hydrocarbon, Smoke emission of 13 ppm, and 1.613 FSN resp. The point prediction approach was used to forecast the combustion and emission parameters of a diesel engine, and the predicted results were in good agreement with the exptl. results. Furthermore, when compared to advance injection timing for biodiesel fuel, retarded injection timing reduces nitric oxide emission. The Split injection strategy is one of the most effective techniques to reduce soot and NO_x emissions while maintaining diesel engine efficiency. 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 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. 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.Formula: C8H16O2

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

Comparative flavor profile analysis of four different varieties of Boletus mushrooms by instrumental and sensory techniques was written by Zhuang, Jinda;Xiao, Qing;Feng, Tao;Huang, Qingrong;Ho, Chi-Tang;Song, Shiqing. And the article was included in Food Research International in 2020.Category: esters-buliding-blocks The following contents are mentioned in the article:

Mushrooms from different varieties and manufacturing methods show different flavor profiles. In order to understand the sensory attributes and aroma compounds of boletus, the discrepancy of aroma profile in four varieties of boletus was determined using gas chromatog.-olfactometry combined with sensory anal. and partial least squares regression anal. (PLSR). Sensory anal. revealed that Boletus Edulis had potent roasted and buttery attributes, Boletus Aereu exhibited woody note and Boletus Auripes Pk presented powerful floral and smoky aromas, while Boletus Rubellus Krombh showed weakness in five sensory attributes. The quant. anal. revealed that the dominant volatiles in boletus samples were esters, aldehydes, acids, alcs., pyrazines, ketones and phenols. A total of 42 potent aroma compounds (OAVs > 1) were determined by aroma extract dilution anal. and quant. anal. 1-Octen-3-ol and 2,5-dimethylpyrazine were the potent aroma compounds among four boletus samples. In addition, the key aroma compounds were 3-(methylthio)propionaldehyde and 2,6-dimethylpyrazine in Boletus edulis. Isovaleric acid, 2,6-dimethylpyrazine, benzeneacetaldehyde and (E)-2-octenal were the key aroma compounds in Boletus aereu. In Boletus auripes Pk, isovaleric acid, 3-ethylphenol and 2,6-dimethylpyrazine were the key aroma compounds, while 3-methylvaleric acid, isovaleric acid and 2,3-dimethylpyrazine significantly contributed to the aroma of boletus rubellus Krombh. 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. 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.Category: esters-buliding-blocks

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