Tag: 100-200

Sensory quality and flavour of alginate coated and repetitive pulsed light treated fresh-cut cantaloupes (Cucumis melo L. Var. Reticulatus Cv. Glamour) during storage was written by Koh, Pei Chen;Noranizan, Mohd Adzahan;Karim, Roselina;Nur Hanani, Zainal Abedin. And the article was included in Journal of Food Science and Technology (New Delhi, India) in 2019.Name: Methyl2-methylbutyrate This article mentions the following:

Fresh-cut fruits are popular due to the convenience provided. However, fresh-cut processes damage fruit tissues and reduce the shelf life of products. Pulsed light (PL) treatment is a decontamination method of foods. PL treatment given repetitively at a certain interval during storage could further extend the shelf life of fresh-cut fruits. Edible coating preserves fresh-cut fruits by providing mech. strength and reducing respiration and water loss. This study was to evaluate the effects of alginate coating combined with repetitive pulsed light (RPL) on sensory quality and flavor of fresh-cut cantaloupes during storage. Cantaloupes were treated with alginate (1.86%, w/v) and RPL (0.9 J/cm² at every 48 h up to 26 days) alone or in combination. Flavor anal. of fresh-cut cantaloupes was carried out every 12 days during storage at 4 ± 1 °C while sensory anal. was performed on day 32. Alginate coating and/or RPL retained sugar contents (17.92-20.01 g/kg FW for fructose, 18.77-19.98 g/kg FW for glucose and 23.02-29.41 g/kg FW for sucrose) in fresh-cut cantaloupes during storage. Combination of alginate with RPL reduced accumulation of lactic acid although alginate coating was more effective to minimise changes of other organic acids in fresh-cut cantaloupes. The combined treatment was also more effective than individual treatment in retaining total aroma compound concentration of fresh-cut cantaloupes during storage with the highest relative concentration, i.e. 3.174 on day 36. Overall, the combined alginate coating and RPL was effective to maintain the fresh-like sensory quality of fresh-cut cantaloupes with insignificant overall acceptability compared to the control. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Name: Methyl2-methylbutyrate).

Methyl2-methylbutyrate (cas: 868-57-5) 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.Name: Methyl2-methylbutyrate

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

One-Pot Synthesis of Imidazole-4-Carboxylates by Microwave-Assisted 1,5-Electrocyclization of Azavinyl Azomethine Ylides was written by Preti, Lisa;Attanasi, Orazio A.;Caselli, Emilia;Favi, Gianfranco;Ori, Claudia;Davoli, Paolo;Felluga, Fulvia;Prati, Fabio. And the article was included in European Journal of Organic Chemistry in 2010.Safety of Methyl 2-thienylacetate This article mentions the following:

Diversely functionalized imidazole-4-carboxylates, e.g., I, were synthesized by microwave-assisted 1,5-electrocyclization of 1,2-diaza-1,3-diene-derived azavinyl azomethine ylides. 1,2-Diaza-1,3-dienes were treated with primary aliphatic or aromatic amines and subjected to microwave irradiation in the presence of aldehydes. 3-Alkyl- and 3-arylimidazole-4-carboxylates were prepared in good yields through a one-pot multicomponent procedure. Modulation of the substituents at C-2, N-3, and C-5 was possible, and 2-unsubstituted imidazoles were obtained when paraformaldehyde was used. In the experiment, the researchers used many compounds, for example, Methyl 2-thienylacetate (cas: 19432-68-9Safety of Methyl 2-thienylacetate).

Methyl 2-thienylacetate (cas: 19432-68-9) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. 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.Safety of Methyl 2-thienylacetate

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

Temperature-Dependent Kinetics of the Reactions of Methyl-2-methyl Propionate and Methyl-2-methyl Butanoate with Cl Atoms under Tropospheric Conditions was written by Kaipara, Revathy;Rajakumar, B.. And the article was included in ACS Earth and Space Chemistry in 2020.HPLC of Formula: 868-57-5 This article mentions the following:

The relative rate technique coupled with gas chromatog. (GC)-flame ionization detection was used to investigate the kinetics of the reaction of Me 2-methylpropionate (M2MP) and Me 2-methylbutanoate (M2MB) with the Cl atom between 268 and 363 K and at 760 Torr of N₂ as a diluent gas. Temperature-dependent Arrhenius expressions were obtained as k_268-363K^M2MP+Cl = [(7.15 ± 1.16) x 10^-12 exp((566 ± 50)/T)] cm³ mol.^-1 s^-1 and k_268-363K^M2MB+Cl = [(6.88 ± 0.80) x 10^-12 exp((794 ± 125)/T)] cm³ mol.^-1 s^-1. The rate coefficients (in units of cm³ mol.^-1 s^-1) at 298 K were measured to be k_298K^M2MP+Cl = (4.61 ± 1.28) x 10^-11 and k_298K^M2MB+Cl = (9.44 ± 1.90) x 10^-11. In addition to this, the measured kinetics were also compared with the kinetics computed using the canonical variational transition state theory/small curvature tunneling /interpolated single-point energies method. The degradation mechanism was also postulated using GC-mass spectrometry and GC-IR spectrometry as the anal. methods. Furthermore, the atm. lifetimes of the test mols. were estimated and are presented in this article. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5HPLC of Formula: 868-57-5).

Methyl2-methylbutyrate (cas: 868-57-5) 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. 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.HPLC of Formula: 868-57-5

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

Electrochemical two-electron oxygen reduction reaction (ORR) induced aerobic oxidation of α-diazoesters was written by Ruan, Mengyao;Chen, Liang;Wen, Ziyang;Yang, Fan;Ma, Chao;Lu, Cuifen;Yang, Guichun;Gao, Meng. And the article was included in Chemical Communications (Cambridge, United Kingdom) in 2022.Recommanded Product: 587-88-2 This article mentions the following:

The recent progress in the oxidation of α-diazoesters R¹C(=N₂)C(O)OR² (R¹ = Ph, 2-naphthyl, benzo[d][1,3]dioxol-5-yl, etc.; R² = Me, cyclohexyl, (tetrahydrofuran-2-yl)methyl, etc.) to α-ketoesters R¹C(O)C(O)OR² by in situ generated hydrogen peroxide via a two-electron oxygen reduction approach was described. A diverse collection of valuable α-ketoester products was obtained with moderate to high yields under an exogenous-oxidant-free and metal catalyst-free electrochem. conditions. In the experiment, the researchers used many compounds, for example, Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2Recommanded Product: 587-88-2).

Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2) 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.Recommanded Product: 587-88-2

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

Synthesis of polyorganophosphazenes and fabrication of their blend microspheres and micro/nanofibers as drug delivery systems was written by Ullah Khan, Rizwan;Wang, Li;Yu, Haojie;Zain-Ul-Abdin;Haq, Fazal;Haroon, Muhammad;Naveed, Kaleem-Ur-Rehman;Elshaarani, Tarig;Fahad, Shah;Ren, Sicong;Wang, Jun. And the article was included in International Journal of Polymeric Materials and Polymeric Biomaterials in 2020.Formula: C9H10O3 This article mentions the following:

Four amino acid-based polyorganophosphazenes were synthesized and characterized by ¹H NMR, ³¹P NMR and GPC. Individually, the synthesized polyorganophosphazenes were blended with two commonly used biocompatible polymers, poly (Me methacrylate) (PMMA) and polylactic-co-glycolic acid (PLGA) to fabricate anticancer drug loaded micro/nanofibers and microspheres. The nature of side groups, blend composition and drug contents were particularly found significant to adjust the surface morphol., hydrolytic degradation and drug loading/release behavior of microspheres. Moreover, higher in vitro drug release rate was observed in acidic medium. Collectively, our findings suggest that amino acid-based polyorganophosphazenes blend’ systems may provide a therapeutic strategy for cancers. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Formula: C9H10O3).

Ethyl 2-hydroxybenzoate (cas: 118-61-6) 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.Formula: C9H10O3

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

Asymmetric Synthesis of Netarsudil: A New Therapeutic for Open-Angle Glaucoma was written by deLong, Mitchell A.;Sturdivant, Jill M.. And the article was included in Synthesis in 2019.Name: Methyl 2-(4-(hydroxymethyl)phenyl)acetate This article mentions the following:

The asym. synthesis of a Rho kinase/norepinephrine transport inhibitor, netarsudil, the active component in the recently FDA-approved product Rhopressa, is described herein. This concise six-step synthetic route utilizes the 2,4-dimethylbenzoate ester of a phenylacetic acid as the backbone of the β-amino acid’s framework. A chiral enolate of the Evans auxiliary, ( R)-4-benzyloxazolidin-2-one, is used to direct the formation of the ( S)-stereocenter by incorporating the N-Boc-protected β-amino Me arm with high diastereoselectivity (96:4 dr) using N-Boc-1-(aminomethyl)benzotriazole as the electrophile. Uniquely, 2,2,2-trichloro-1,1-dimethylethyl chloroformate is used as a non-racemizing activating agent for the coupling reaction between the chiral (S)-3-[(tert-Butoxycarbonyl)amino]-2-(4-{[(2,4-dimethylbenzoyl)oxy]methyl}phenyl)propanoic acid and 6-aminoisoquinoline to provide N-Boc-protected netarsudil in good yield and excellent enantiomeric purity (63%, 98% ee). Final acidic deprotection and recrystallization provides netarsudil (>99% ee), an ophthalmic agent used for the treatment of patients with open-angle glaucoma. In the experiment, the researchers used many compounds, for example, Methyl 2-(4-(hydroxymethyl)phenyl)acetate (cas: 155380-11-3Name: Methyl 2-(4-(hydroxymethyl)phenyl)acetate).

Methyl 2-(4-(hydroxymethyl)phenyl)acetate (cas: 155380-11-3) 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. 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.Name: Methyl 2-(4-(hydroxymethyl)phenyl)acetate

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

Influence of apricot constituents as eco-friendly corrosion inhibitor for mild steel in acidic medium: A theoretical approach was written by Khadom, Anees A.;Jassim, Salah A.;Kadhim, Mustafa M.;Ali, Nabaa B.. And the article was included in Journal of Molecular Liquids in 2022.COA of Formula: C12H20O2 This article mentions the following:

The corrosion prevention mechanism of steel by apricot juice as green chems. was better understood using mol. dynamics and quantum chem. simulations. Furthermore, math. and statistical anal. were a powerful tool for building a relationship between inhibitor performance and independent variables. Eighteen main compounds of apricot juice were investigated using quantum chem. calculations HOMO energy, LUMO energy, energy gap, chem. hardness, electrophilicity index, softness, and back donation were calculated as identifications parameters. Caffeic acid, beta-cyclocitral and gallic acid were observed as the most potent inhibitors between all the studied components. In addition, docking studies were applied to present the interactions with A.ferrooxidans bacteria that caused the corrosion. Math. model, with good correlation coefficient, was designed to link quantum chem. characteristics to theor. inhibitory efficiency (%IEcal). Theor. data were compared with exptl. one (%IEexp). %IEexp was ranged from 53 to 75%, while the %IEcal was ranged from 61 to 73%. In the experiment, the researchers used many compounds, for example, (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3COA of Formula: C12H20O2).

(E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3) 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. 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. COA of Formula: C12H20O2

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

Water-soluble esters: useful enzyme substrates for the synthesis of β-lactam antibiotics was written by Muneyuki, Ryonosuke;Mitsugi, Takashi;Kondo, Eiji. And the article was included in Chemistry & Industry (London, United Kingdom) in 1981.Application of 19432-68-9 This article mentions the following:

Water-soluble thienyl and aromatic esters acylated β-lactam amines in the presence of 3 enzymes. E.g., I, prepared by treating RCH₂CO₂Me (R = 2-thienyl) with H(OCH₂CH₂)₄OH and K₂CO₃ (60°, 70 mm Hg, 3 h), with II (R¹ = H) in the presence of Bacillus circulans M-1123-5 gave 49.6% II (R¹ = 2-thienylacetyl). In the experiment, the researchers used many compounds, for example, Methyl 2-thienylacetate (cas: 19432-68-9Application of 19432-68-9).

Methyl 2-thienylacetate (cas: 19432-68-9) 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. 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 of 19432-68-9

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

Mild halogenation of stabilized ester enolates by cupric halides was written by Shi, Xiaoxin;Dai, Lixin. And the article was included in Journal of Organic Chemistry in 1993.Recommanded Product: Diethyl 2-(prop-2-yn-1-yl)malonate This article mentions the following:

The reactions of various stabilized ester enolates of 2-keto, 2-(alkoxycarbonyl), 2-phosphoryl, and 2-(benzenesulfonyl) esters with cupric chloride or cupric bromide have been examined The reactions lead to 2-halo esters in good to excellent yields under mild conditions. Enolates which contain an unsaturated functionality such as a double bond, a triple bond, or an allylic or a benzylic moiety react with high chemoselectivity. In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Recommanded Product: Diethyl 2-(prop-2-yn-1-yl)malonate).

Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Recommanded Product: Diethyl 2-(prop-2-yn-1-yl)malonate

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

Effect of different drying technologies on the characteristics and quality of lemon slices was written by Xu, Qinglian;Pan, Hongjie;Shui, Yuru;Xing, Yage;Wu, Lin;Zheng, Faying;Fan, Xiangfeng;Bi, Xiufang. And the article was included in Journal of Food Science in 2022.Recommanded Product: (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate This article mentions the following:

This experiment aimed to investigate the effects of four drying methods, namely, hot air drying (HAD), microwave drying (MD), vacuum drying (VD), and microwave vacuum drying (MVD), on the quality of lemon slices. The relevant indicators, including total phenolic content, ascorbic acid content, browning, color, reducing sugar content, volatile component measurements, and principal component anal. of 0 and 30 days storage, were compared after exposure to the four drying methods. The shortest time of 64 min was used to treat the lemon slices via MVD at 1 KW. These samples displayed the least damage after drying and the highest rehydration ratio of 4.12. The contents of VC, reducing sugars, and total phenols of MVD samples were significantly higher than those in the HAD, VD, and MD groups, retaining 105.94 mg/100 g, 21.35 g/100 g, and 77.81 mg GAE/g, resp., while their color difference values were also the smallest, with a browning degree of 3.55, significantly lower than those in the other treatment groups (p < 0.05), and the degree of browning of the samples in the HAD treatment group was the most serious; in terms of volatile flavor substances, the lemon slice samples in the MVD and HAD treatment groups were more diverse and of better quality. The order of product sensory evaluation was: MVD > VD > HAD > MD. The final scores after comprehensive anal. revealed the order of the four drying methods as MVD, HAD, VD, and MD. Therefore, MVD had a better effect on the sensory perception and nutritional properties of the lemon slices, providing a useful alternative to the conventional drying method. Practical Application : Lemon slices during drying are affected by various aspects, leading to changes in its color, aroma substances, and nutrient composition The results of this work will not only provide a tech. reference for the future production of high-quality dried lemon slices, but also have important implications for fresh-cut lemons in processing and storage. It also generates important implications for fresh-cut lemons in processing and storage. In the experiment, the researchers used many compounds, for example, (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3Recommanded Product: (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate).

(E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3) 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. 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.Recommanded Product: (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate

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