Month: November 2022

Variation of anionic moieties of dicationic ionic liquid GC stationary phases: Effect on stability and selectivity was written by Talebi, Mohsen;Patil, Rahul A.;Sidisky, Leonard M.;Berthod, Alain;Armstrong, Daniel W.. And the article was included in Analytica Chimica Acta in 2018.Quality Control of Methyl nonadecanoate The following contents are mentioned in the article:

Dicationic ionic liquids (DILs) are more and more accepted as a new class of high temperature and polar stationary phases for gas chromatog. (GC). This study deals with the effect of seven different fluorosulfonyl derivatized anions associated with two dications: 1,3-di(3-methylimidazolium)-2-methylpropane [2mC₃(mim)₂], and 1,3-di(3-methylimidazolium)-isobutene [i-eneC₄(mim)₂]. Thermophys. properties of the 14 synthesized DILs were evaluated in terms of m.p., viscosity, and thermal stability. The optimal physicochem. properties of 13 DILs allowed preparing 13GC capillary columns. Accordingly, the polarity and selectivity of the DILs were evaluated by determining the Rohrschneider-McReynolds constants and the equivalent chain lengths of C18 fatty acid Me esters (FAMEs). The sym. fluoroalkylsulfonyl and the trifluorosulfonate anions seem to produce the most polar DILs. Compared to classical polyethyleneglycol phases, the DILs showed substantially decreased retention of apolar compounds and a much stronger retention of the polar ones. Unique selectivities were observed with unsaturated FAMEs, polyaromatic hydrocarbons, and bacterial specific FAMEs. The two applications presented included a biodiesel and bacterial FAME analyses. 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. 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. 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

Comparative evaluation of physical properties and volatiles profile of cabbages subjected to hot air and freeze drying was written by Rajkumar, Gomathi;Shanmugam, Saravanan;Galvao, Mercia de Sousa;Dutra Sandes, Rafael Donizete;Leite Neta, Maria Terezinha Santos;Narain, Narendra;Mujumdar, Arun Sadashiv. And the article was included in LWT–Food Science and Technology in 2017.Electric Literature of C4H7NS The following contents are mentioned in the article:

The aim of the present study was to evaluate the phys. parameters, volatiles profile and sensory quality of the cabbage pieces subjected to hot air drying and freeze drying processes. Phys. properties such as water activity, shrinkage, hardness, springiness, cohesiveness, chewiness, rehydration ratio and color measurements were measured using standard procedures while the volatile compounds were determined by the SPME-GC-MS method. The results showed that convective drying of cabbages lead to major adverse changes in phys. and volatile compounds characteristics. Hot air and freeze drying of cabbages display different volatiles profile containing aldehydes, alcs., terpenes, ketones and furans. Better retention of character impact cabbage green and pungent aroma compounds viz. allyl isothiocyanate, di-Me sulfide, di-Me disulfide, 1-octen-3-ol and (Z)-2-penten-1-ol was found in freeze dried cabbage. The presence of 3-(methylthio)-Pr isothiocyanate, Me benzene isothiocyante and Ph Et isothiocyanate is reported here for the first time in fresh cabbages. The flavor components of fresh cabbage were largely retained in the freeze dried product. Freeze drying also leads to pos. sensory effects and better overall acceptability by consumers compared to the hot air dried product. This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8Electric Literature of C4H7NS).

Isopropylisothiocyanate (cas: 2253-73-8) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. 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. Electric Literature of C4H7NS

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

Characterization of key odorants in Hanyuan and Hancheng fried pepper (Zanthoxylum bungeanum) oil was written by Sun, Jie;Sun, Baoguo;Ren, Fazheng;Chen, Haitao;Zhang, Ning;Zhang, Yuyu. And the article was included in Journal of Agricultural and Food Chemistry in 2020.Application of 112-14-1 The following contents are mentioned in the article:

Fried pepper (Zanthoxylum bungeanum Maxim.) oil has been widely used in traditional Chinese cuisine and has recently become increasingly popular in food manufacturing Thus, the aroma profiles of Hancheng pepper oil (HCPO) and Hanyuan pepper oil (HYPO) from two regions were investigated by aroma extract dilution anal. (AEDA) combined with gas chromatog.-mass spectrometry-olfactometry (GC-MS-O). Results from AEDA showed that more aroma compounds with flavor dilution factors ≥9 were detected in HCPO than in HYPO. The odor activity values (OAVs) revealed 28 odorants with OAVs ≥1 in HCPO or HYPO. High OAVs were in particular obtained for 1,8-cineole, (E)-2-heptenal, β-myrcene, β-ocimene, limonene, and linalool. Then, the aroma profiles of HCPO and HYPO were successfully simulated through aroma recombination models. Omission tests suggested that β-phellandrene, p-cymene, acetic acid octyl ester, octanal, citronellol, and sabinene played key roles in aroma differences between HCPO and HYPO. In addition, varying enantiomeric ratios of linalool (floral) and limonene (citrus-like and lemon-like) in HCPO and HYPO were observed by chiral GC-MS, and the odor impressions of limonene and linalool were in good agreement with the odor descriptions of S-(-)-limonene and S-(+)-linalool. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Application of 112-14-1).

Octyl acetate (cas: 112-14-1) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. 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 of 112-14-1

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

Solubilization of artificial mitochondrial membranes by amphiphilic copolymers of different charge was written by Janson, Kevin;Zierath, Jennifer;Kyrilis, Fotis L.;Semchonok, Dmitry A.;Hamdi, Farzad;Skalidis, Ioannis;Kopf, Adrian H.;Das, Manabendra;Kolar, Cenek;Rasche, Marie;Vargas, Carolyn;Keller, Sandro;Kastritis, Panagiotis L.;Meister, Annette. And the article was included in Biochimica et Biophysica Acta, Biomembranes in 2021.Reference of 26662-94-2 The following contents are mentioned in the article:

Certain amphiphilic copolymers form lipid-bilayer nanodiscs from artificial and natural membranes, thereby rendering incorporated membrane proteins optimal for structural anal. Recent studies have shown that the amphiphilicity of a copolymer strongly determines its solubilization efficiency. This is especially true for highly neg. charged membranes, which experience pronounced Coulombic repulsion with polyanionic polymers. Here, we present a systematic study on the solubilization of artificial multicomponent lipid vesicles that mimic inner mitochondrial membranes, which harbor essential membrane-protein complexes. In particular, we compared the lipid-solubilization efficiencies of established anionic with less densely charged or zwitterionic and even cationic copolymers in low- and high-salt concentrations The nanodiscs formed under these conditions were characterized by dynamic light scattering and neg.-stain electron microscopy, pointing to a bimodal distribution of nanodisc diameters with a considerable fraction of nanodiscs engaging in side-by-side interactions through their polymer rims. Overall, our results show that some recent, zwitterionic copolymers are best suited to solubilize neg. charged membranes at high ionic strengths even at low polymer/lipid ratios. This study involved multiple reactions and reactants, such as (2R,9Z)-1-(((2-Aminoethoxy)(hydroxy)phosphoryl)oxy)-3-(palmitoyloxy)propan-2-yl oleate (cas: 26662-94-2Reference of 26662-94-2).

(2R,9Z)-1-(((2-Aminoethoxy)(hydroxy)phosphoryl)oxy)-3-(palmitoyloxy)propan-2-yl oleate (cas: 26662-94-2) 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. Reference of 26662-94-2

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

Use of Hanseniaspora guilliermondii and Hanseniaspora opuntiae to enhance the aromatic profile of beer in mixed-culture fermentation with Saccharomyces cerevisiae was written by Bourbon-Melo, Nuno;Palma, Margarida;Rocha, Miguel Pinto;Ferreira, Antonio;Bronze, Maria Rosario;Elias, Hugo;Sa-Correia, Isabel. And the article was included in Food Microbiology in 2021.Reference of 112-14-1 The following contents are mentioned in the article:

Beer production is predominantly carried out by Saccharomyces species, such as S. cerevisiae and S. pastorianus. However, the introduction of non-Saccharomyces yeasts in the brewing process is now seen as a promising strategy to improve and differentiate the organoleptic profile of beer. In this study, 17 non-Saccharomyces strains of 12 distinct species were isolated and submitted to a preliminary sensory evaluation to determine their potential for beer bioflavouring. Hanseniaspora guilliermondii IST315 and H. opuntiae IST408 aroma profiles presented the highest acceptability and were described as having ‘fruity’ and ‘toffee’ notes, resp. Their presence in mixed-culture fermentations with S. cerevisiae US-05 did not influence attenuation and ethanol concentration of beer but had a significant impact in its volatile composition Notably, while both strains reduced the total amount of Et esters, H. guilliermondii IST315 greatly increased the concentration of acetate esters, especially when sequentially inoculated, leading to an 8.2-fold increase in phenylethyl acetate (‘rose’, ‘honey’ aroma) in the final beverage. These findings highlight the importance of non-Saccharomyces yeasts in shaping the aroma profile of beer and suggest a role for Hanseniaspora spp. in improving it. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Reference of 112-14-1).

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. 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.Reference of 112-14-1

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

A chemometric approach to compare Portuguese native hops with worldwide commercial varieties was written by Martins, Zita E.;Machado, Julio C. Jr.;Cunha, Sara C.;Barata, Ana Maria;Ferreira, Isabel M. P. L. V. O.. And the article was included in Journal of Chemometrics in 2020.Category: esters-buliding-blocks The following contents are mentioned in the article:

A diversity of native hops can be found in Portugal, but little is known concerning their volatile and sensory profiles. Nowadays, the exponential growth of the craft beer sector and the preference for more flavoured beers promote the research of unexplored wild hops that have the advantage of being well adapted to the Portuguese edaphoclimatic conditions. Therefore, the goal of this study was to characterize the volatile profile of 75 native Portuguese hops and compare with 34 com. varieties by means of headspace solid-phase microextraction gas chromatog./mass spectrometry (HS-SPME-GC/MS), in order to select those that present similarities with commercialized hops and confirm by check-all-that-apply (CATA) anal. if they present similar organoleptic characteristics. Due to the complexity of hop volatile profile and the great number of samples analyzed, robust chemometric treatment of chromatog. and sensorial data was required to make reliable conclusions. Twelve Portuguese hops present a volatile profile and sensory characteristics quite similar to some com. varieties, because 11 Portuguese hops were grouped with the European varieties Challenger, Hallertauer Magnum and Perle, both in volatile profile and sensory anal. and one clustered with American registered varieties. 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 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. 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

A chemometric approach to compare Portuguese native hops with worldwide commercial varieties was written by Martins, Zita E.;Machado, Julio C. Jr.;Cunha, Sara C.;Barata, Ana Maria;Ferreira, Isabel M. P. L. V. O.. And the article was included in Journal of Chemometrics in 2020.Name: Methyl heptanoate The following contents are mentioned in the article:

A diversity of native hops can be found in Portugal, but little is known concerning their volatile and sensory profiles. Nowadays, the exponential growth of the craft beer sector and the preference for more flavoured beers promote the research of unexplored wild hops that have the advantage of being well adapted to the Portuguese edaphoclimatic conditions. Therefore, the goal of this study was to characterize the volatile profile of 75 native Portuguese hops and compare with 34 com. varieties by means of headspace solid-phase microextraction gas chromatog./mass spectrometry (HS-SPME-GC/MS), in order to select those that present similarities with commercialized hops and confirm by check-all-that-apply (CATA) anal. if they present similar organoleptic characteristics. Due to the complexity of hop volatile profile and the great number of samples analyzed, robust chemometric treatment of chromatog. and sensorial data was required to make reliable conclusions. Twelve Portuguese hops present a volatile profile and sensory characteristics quite similar to some com. varieties, because 11 Portuguese hops were grouped with the European varieties Challenger, Hallertauer Magnum and Perle, both in volatile profile and sensory anal. and one clustered with American registered varieties. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Name: Methyl heptanoate).

Methyl heptanoate (cas: 106-73-0) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. 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.Name: Methyl heptanoate

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

Catalytic hydroboration of carbonyl derivatives by using phosphinimino amide ligated magnesium complexes was written by Li, Min;Liu, Xinli;Cui, Dongmei. And the article was included in Dalton Transactions in 2021.Related Products of 102-09-0 The following contents are mentioned in the article:

Reduction of carbonyl derivatives by using Earth-abundant, cheap, and environmentally benign metal-based catalysts through an atom-efficient method is a challenging task. Herein, authors report the synthesis and characterization of dinuclear magnesium complexes 1–3 chelated by a phosphinimino amide skeleton. In combination with pinacolborane (HBpin) as a reducing agent, complex 1 bearing an ortho-Me substituent on the Ph ring of the ligand showed excellent reduction capability for a broad range of carbonyl derivatives under mild reaction conditions. Aldehydes, ketones, and acrolein substrates were efficiently reduced to the corresponding alkoxy-borane products with a record high TOF. Besides, acrolein derivatives were exclusively reduced to 1,2-regioselective products. Using two equivalent of HBpin, ester substrates were reduced to two kinds of alkoxy-borane products. Carbonate reduction accomplished by using complex 1 and three equivalent of HBpin afforded diols and a methanol precursor, resp. When chiral substrates such as (S)-1,2-propanediol carbonate and L-lactide or polymeric P(L-LA) were employed, the chirality was almost retained in their reductive products. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Related Products 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. 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.Related Products of 102-09-0

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

Preparation and standardisation of herbal eye dark circle remover was written by Mufseena, P.;Celestin Baboo, R. V.;Shiji Kumar, P. S.. And the article was included in World Journal of Pharmaceutical Research in 2022.Computed Properties of C21H44O5 The following contents are mentioned in the article:

The eye, which is the point of convergence, not only conveys the full range of human emotion but also has a significant impact on how one is perceived in terms of health and beauty. Whenever correlated with other body parts, the skin around the eye is a region without many oil glands and collagen, so it is more inclined to scarce differences and drying out. Addnl. when there is more melanin produced around the eyes than is usual giving them a darker color, the condition is called periorbital hyperpigmentation. The principle objective of this research is to formulate, characterize and evaluate a herbal under-eye cream which consists of the extracts of cucumber (Cucumis sativus), Aloe vera (Aloe barbadensis) and Vitamin E. The cream was prepared by using the cream base, beeswax, liquid paraffin, borax, aloe extract and cucumber extract The prepared formulation was evaluated for different parameters like phys. evaluations, pH, greasiness, phase separation and test for microorganism. The formulation showed good appearance, good pH, no phase separation and microbial growth. Also it is stable at room temperature The formulation containing herbal ingredients showed significant activity. Based upon the result, the formulation is stable and can be safely used as an under eye cream. This study involved multiple reactions and reactants, such as Glyceryl monostearate (cas: 31566-31-1Computed Properties of C21H44O5).

Glyceryl monostearate (cas: 31566-31-1) 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. 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.Computed Properties of C21H44O5

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

Preparation and characterization of novel functional tri-block copolymer for constructing temperature/redox dual-stimuli responsive micelles was written by Liu, Tianyue;Lang, Meidong. And the article was included in Journal of Macromolecular Science in 2022.Electric Literature of C13H10O3 The following contents are mentioned in the article:

Herein, we reported a novel tri-block copolymer synthesized by segmented ring-opening polymerization of temperature-sensitive 5-(pyrrolidine-1-carbonyl) oxepan-2-one monomer (VPyCL) and redox-sensitive macrocyclic disulfide-substituted carbonate monomer (MSS). The structure of the copolymers was confirmed by GPC, 1H NMR and 13C NMR. The obtained tri-block copolymers could self-assemble in aqueous solution to form well-structured micelles, with the mPEG-b-PVPyCL block acting as the hydrophilic coronal and the PSS block acting as the hydrophobic core. Dynamic light scattering (DLS) studies confirmed that micelles formed by these tri-block copolymers with different block ratios could respond to different temperature ranges during the heating/cooling process and respond to reducing agent glutathione (GSH). In addition, transmission electron microscopy (TEM) results further confirmed the polymeric micelles′ dual-stimuli responsiveness. The potential application of this type of dual-stimuli responsive micelles in drug delivery systems was evaluated using doxorubicin (DOX) as the model mol. The stimulus-dependent responsive behaviors of obtained micelles can be applied to the construction of smart materials capable of performing multiple functions under the appropriate conditions. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Electric Literature of C13H10O3).

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. 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 C13H10O3

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