Month: December 2022

Development of hydroxypropyl methylcellulose film with xanthan gum and its application as an excellent food packaging bio-material in enhancing the shelf life of banana was written by Zheng, Meixia;Chen, Jianfu;Tan, Kok Bing;Chen, Meichun;Zhu, Yujing. And the article was included in Food Chemistry in 2022.Reference of 2198-61-0 The following contents are mentioned in the article:

A novel film composed of xanthan gum (XG) and hydroxypropyl methylcellulose (HPMC) was prepared (XH). The films were characterized by Fourier transform IR spectroscopy (FT-IR), X-ray diffraction (XRD), and SEM (SEM). The light transmittance, mech. properties and water vapor transmission rate (WVTR) indicated the good compatibility between XG and HPMC with hydrogen-bond interaction and XG had a significant effect on the chem. structure, crystalline texture and microstructure of the XH composite film. The best XH sample with optimum XG concentration of 2 g/L was used as food packaging via coating onto banana, whereby the weight loss rate on banana was able to decreased from 25 ± 3% (without XH coating) to 16 ± 4% (with XH coating). Consequently, the release of flavor substances was also decreased. Banana shelf life has qual. improved with XH composite film for food preservation and affirmed the uses in food packaging applications. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Reference of 2198-61-0).

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. 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. Reference of 2198-61-0

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

Real-time quality authentication of honey using atmospheric pressure chemical ionisation mass spectrometry (APCI-MS) was written by ElMasry, Gamal;Morsy, Noha;Al-Rejaie, Salim;Ayed, Charfedinne;Linforth, Robert;Fisk, Ian. And the article was included in International Journal of Food Science and Technology in 2019.Formula: C8H16O2 The following contents are mentioned in the article:

The aim of this study was to use gas chromatog.-mass spectrometry (GC-MS) and APCI-MS techniques to detect adulteration in honey. The key volatile compounds in the headspace of the adulterated honey were marked by GC-MS and their representative fragment ions were utilized in scanning honey samples using the real-time APCI-MS system. The PLS models validated using independent data sets resulted in coefficient of the determination (Rp2) of 0.97 and 0.96 and root mean square error in prediction (RMSEP) of 2.62 and 2.45 for the GC-MS and APCI-MS data sets resp. The most efficient volatiles from GC-MS anal. and their corresponding fragment ions m/z from APCI-MS data anal. were then identified and used to develop new PLS models to predict the level of adulteration. The best PLS model gave Rp2 of 0.95 and RMEP of 2.60% in the independent validation set indicating that the model was very accurate in predicting the level of adulteration. 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. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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.Formula: C8H16O2

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

Phenyl glycosides – Solid-state NMR, X-ray diffraction and conformational analysis using genetic algorithm was written by Walejko, Piotr;Bukowicki, Jaroslaw;Dobrzycki, Lukasz;Socha, Pawel;Paradowska, Katarzyna. And the article was included in Chemical Physics in 2019.Name: (2S,3R,4S,5R,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate The following contents are mentioned in the article:

The X-ray structures of 2,6-dimethylphenyl and Ph 2,3,4,6-tetra-O-acetyl β-glucosides and Ph α-mannoside were obtained. The independent part of the unit cell of the glycosides was formed by one mol., and for another glucoside, two mols. in the crystal cell were observed In deacetylated glycosides the crystal structure was established by a hydrogen bond network formed between the sugar hydroxyls and solvent mols. The ¹³C CPMAS NMR spectra of aryl glycosides were analyzed. In the spectrum of Ph peracetylated glucoside, doubling of the C4 aryl signal was observed which confirmed the presence of two independent mols. in the solid sample. The GAAGS (Genetic Algorithm-Assisted Grid Search) method was used to determine the low-energy conformers of α-mannosides and β-glucosides. The orientation of the aryl pendant group was calculated using Mol. Mechanics (MMFF94) as well as Quantum Mechanics theory (DFT, B3LYP/6-31 + G(d,p)). 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: 604-69-3Name: (2S,3R,4S,5R,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate).

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

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

Dielectric enhancement over a broad temperature by nanofiller at ultra-low volume content in poly(ether methyl ether urea) was written by Zhang, Tian;Chen, Xin;Zhang, Qiyan;Zhang, Q. M.. And the article was included in Applied Physics Letters in 2020.Computed Properties of C13H10O3 The following contents are mentioned in the article:

This Letter studies the dielec. responses of nanocomposites of poly(ether Me ether urea) (PEMEU) with alumina nanofillers at less than 0.7% volume loading (0.7 volume %). The results show that the dielec. constant K of PEMEU nanocomposites is enhanced by the nanofillers. The enhancement peaks at 0.33 volume % nanofiller loading, from K = 3.9 of neat polymer to K = 5.5 of nanocomposites from room temperature to 200°C, above the glass transition (âˆ?50°C) of the polymer. Except for an enhanced dielec. constant, the nanocomposite maintains a low dielec. loss and a high breakdown strength of 500 MV/m at room temperature and 300 MV/m at 150°C, resp. Thus, the nanocomposite with 0.33 volume % nanofillers delivers discharged energy densities of 6.5 J/cm³ at room temperature and 2 J/cm³ at 150°C with better than 90% charge/discharge efficiency, 40% higher than the neat polymer. (c) 2020 American Institute of Physics. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Computed Properties of C13H10O3).

Diphenyl carbonate (cas: 102-09-0) 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.Computed Properties of C13H10O3

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

Enantiomeric synthesis of natural alkylglycerols and their antibacterial and antibiofilm activities was written by Fernandez Montoya, Deicy J.;Contreras Jordan, Luis A.;Moreno-Murillo, Barbara;Silva-Gomez, Edelberto;Mayorga-Wandurraga, Humberto. And the article was included in Natural Product Research in 2021.Application In Synthesis of Methyl heptanoate The following contents are mentioned in the article:

Alkylglycerols (AKGs) are bioactive natural compounds that vary by alkyl chain length and degree of unsaturation, and their absolute configuration is 2S. Three AKGs were synthesized in enantiomerically pure form, and were characterized for the 1st time together with 12 other known and naturally occurring AKGs. Their structures were established using ¹H and ¹³C APT NMR with 2D-NMR, ESI-MS, or HRESI-MS and optical rotation data, and they were tested for their antibacterial and antibiofilm activities. Some AKGs showed activity against 5 clin. isolates and Pseudomonas aeruginosa ATCC 15442, with MIC values in the range of 15-125μg/mL. In addition, at half of the MIC, most of the AKGs reduced Staphylococcus aureus biofilm formation in the range of 23-99% and P. aeruginosa ATCC 15442 biofilm formation in the range of 14-64%. The antibiofilm activity of the AKGs assessed in this work had not previously been studied. 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 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. 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.Application In Synthesis of Methyl heptanoate

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

Enantiomeric synthesis of natural alkylglycerols and their antibacterial and antibiofilm activities was written by Fernandez Montoya, Deicy J.;Contreras Jordan, Luis A.;Moreno-Murillo, Barbara;Silva-Gomez, Edelberto;Mayorga-Wandurraga, Humberto. And the article was included in Natural Product Research in 2021.Name: Methyl nonadecanoate The following contents are mentioned in the article:

Alkylglycerols (AKGs) are bioactive natural compounds that vary by alkyl chain length and degree of unsaturation, and their absolute configuration is 2S. Three AKGs were synthesized in enantiomerically pure form, and were characterized for the 1st time together with 12 other known and naturally occurring AKGs. Their structures were established using ¹H and ¹³C APT NMR with 2D-NMR, ESI-MS, or HRESI-MS and optical rotation data, and they were tested for their antibacterial and antibiofilm activities. Some AKGs showed activity against 5 clin. isolates and Pseudomonas aeruginosa ATCC 15442, with MIC values in the range of 15-125μg/mL. In addition, at half of the MIC, most of the AKGs reduced Staphylococcus aureus biofilm formation in the range of 23-99% and P. aeruginosa ATCC 15442 biofilm formation in the range of 14-64%. The antibiofilm activity of the AKGs assessed in this work had not previously been studied. This study involved multiple reactions and reactants, such as Methyl nonadecanoate (cas: 1731-94-8Name: Methyl nonadecanoate).

Methyl nonadecanoate (cas: 1731-94-8) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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.Name: Methyl nonadecanoate

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

Binding of SecA ATPase monomers and dimers to lipid vesicles was written by Roussel, Guillaume;White, Stephen H.. And the article was included in Biochimica et Biophysica Acta, Biomembranes in 2020.Category: esters-buliding-blocks The following contents are mentioned in the article:

The Escherichia coli SecA ATPase motor protein is essential for secretion of proteins through the SecYEG translocon into the periplasmic space. Its function relies upon interactions with the surrounding lipid bilayer as well as SecYEG translocon. That neg. charged lipids are required for bilayer binding has been known for >25 yr, but little systematic quant. data is available. We have carried out an extensive investigation of SecA partitioning into large unilamellar vesicles (LUV) using a wide range of lipid and electrolyte compositions, including the principal cytoplasmic salt of E. coli, potassium glutamate, which we have shown stabilizes SecA. The water-to-bilayer transfer free energy is about -7.5 kcal/mol for typical E. coli lipid compositions Although it has been established that SecA is dimeric in the cytoplasm, we find that the most widely cited dimer form (PDB 1M6N) binds only weakly to LUVs formed from E. coli lipids. This study involved multiple reactions and reactants, such as (2R,9Z)-1-(((2-Aminoethoxy)(hydroxy)phosphoryl)oxy)-3-(palmitoyloxy)propan-2-yl oleate (cas: 26662-94-2Category: esters-buliding-blocks).

(2R,9Z)-1-(((2-Aminoethoxy)(hydroxy)phosphoryl)oxy)-3-(palmitoyloxy)propan-2-yl oleate (cas: 26662-94-2) 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.Category: esters-buliding-blocks

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

Novel carbohydrate modified berberine derivatives: synthesis and in vitro anti-diabetic investigation was written by Han, Liwen;Sheng, Wenlong;Li, Xiaobin;Sik, Attila;Lin, Houwen;Liu, Kechun;Wang, Lizhen. And the article was included in MedChemComm in 2019.Related Products of 604-69-3 The following contents are mentioned in the article:

Berberine is a bioactive alkaloid used in Chinese medicine and has numerous pos. effects on biol. systems. This paper describes the facile and highly efficient synthesis of some carbohydrate modified berberine derivatives, and conjugation of the carbohydrate moiety with berberine was finished by “click” chem. The cytotoxicity and anti-diabetic measurements of all berberine derivatives were accomplished on HepG2 cell lines, and the results indicated that most of the derivatives exhibit higher anti-diabetic activity than berberine. The mannose modified berberine derivative has significantly lower cytotoxicity than berberine, and the induced IC50 value of this derivative is nearly 1.5 times that of berberine. Furthermore, this mannose modified berberine derivative exhibits high anti-diabetic activity at both high and low drug concentrations, thereby indicating its potential application for the development of novel anti-diabetic drugs. 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: 604-69-3Related Products of 604-69-3).

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

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

Comparison of cell disruption methods for improving lipid extraction from thraustochytrid strains was written by Byreddy, Avinesh R.;Gupta, Adarsha;Barrow, Colin J.;Puri, Munish. And the article was included in Marine Drugs in 2015.Quality Control of Methyl nonadecanoate The following contents are mentioned in the article:

Lipid extraction is an integral part of biodiesel production, as it facilitates the release of fatty acids from algal cells. To utilize thraustochytrids as a potential source for lipid production We evaluated the extraction efficiency of various solvents and solvent combinations for lipid extraction from Schizochytrium sp. S31 and Thraustochytrium sp. AMCQS5-5. The maximum lipid extraction yield was 22% using a chloroform:methanol ratio of 2:1. We compared various cell disruption methods to improve lipid extraction yields, including grinding with liquid nitrogen, bead vortexing, osmotic shock, water bath, sonication and shake mill. The highest lipid extraction yields were obtained using osmotic shock and 48.7% from Schizochytrium sp. S31 and 29.1% from Thraustochytrium sp. AMCQS5-5. Saturated and monounsaturated fatty acid contents were more than 60% in Schizochytrium sp. S31 which suggests their suitability for biodiesel production 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. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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.Quality Control of Methyl nonadecanoate

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

Performance and selectivity of lower-rim substituted calix[4]arene as a stationary phase for capillary gas chromatography was written by Sun, Tao;Li, Bin;Shuai, Xiaomin;Chen, Yujie;Li, WeiWei;Cai, Zhiqiang;Qiao, Xiaoguang;Hu, Shaoqiang;Ma, Lufang. And the article was included in RSC Advances in 2019.Application In Synthesis of Methyl heptanoate The following contents are mentioned in the article:

This work presents the investigation of p-tert-butyl(tetradecyloxy)calix[4]arene (C4A-C10) as stationary phase for capillary gas chromatog. (GC) separations The statically-coated C4A-C10 capillary column showed weak polarity and column efficiency of 2566 plates per m determined by n-dodecane at 120°C. Impressively, the C4A-C10 column exhibited extremely high resolving capability for a wide range of analytes from nonpolar to polar, including n-alkanes, esters, ketones, aldehydes, alcs. and bromoalkanes. Most importantly, the C4A-C10 column exhibited an excellent separation performance for positional, structural and cis-/trans-isomers. Among them, the column displayed advantageous resolving capability over the com. polysiloxane stationary phase for aromatic amine isomers. Moreover, the C4A-C10 column showed good column repeatability with RSD values below 0.06% for run-to-run, 0.12-0.27% for day-to-day and 2.8-5.3% for column-to-column. 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 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 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 In Synthesis of Methyl heptanoate

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