Category: 868-57-5

Effects of modified atmosphere and sugar immersion on physiology and quality of fresh-cut ‘Braeburn’ apples was written by Rux, G.;Bohne, K.;Huyskens-Keil, S.;Ulrichs, Ch.;Hassenberg, K.;Herppich, W. B.. And the article was included in Food Packaging and Shelf Life in 2021.Safety of Methyl2-methylbutyrate This article mentions the following:

Fresh-cut fruits are highly perishable and show a short shelf life. Therefore, storage in sugar syrup is com. used to delay undesirable metabolic changes and to prevent browning. Investigations on the effects of syrup application on volatile organic compounds (VOCs), important for the consumers’ acceptance, are rare. It is, however, known that low O₂ availability, as found in fruit slices after immersion, may result in the formation of unwanted off-odor. This neg. affects the sensory quality of fresh-cuts. In the present study, fresh-cut ‘Braeburn’ apples were comparatively stored in air, in three modified atmospheres (O₂: 10, 5 and approx. 0%; CO₂: 10, 15 and 20%) or in sugar syrup (20% sugar content). Relevant quality, physiol. and microbiol. parameters were evaluated on days 3, 6 and 10 of storage. Particular focus was laid on the evaluation of VOC emission to indicate biosynthetic responses that affect aroma-relevant VOCs. Atm. storage of apple slices, among others, increased the emission of Et acetate, which may create off-odor and neg. affects the customers’ acceptance. In contrast, syrup-immersion of apple slices resulted in a pronounced loss of aroma but prevented the occurrence of off-odor. The results indicated metabolic changes, which were independent of O₂ availability. High CO₂ or VOCs concentrations in the fruit tissue may inhibit esterification or may induce a feedback inhibition of VOC synthesis. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Safety of 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. 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.Safety of Methyl2-methylbutyrate

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

Influence of Freezing and Different Drying Methods on Volatile Profiles of Strawberry and Analysis of Volatile Compounds of Strawberry Commercial Jams was written by Abouelenein, Doaa;Mustafa, Ahmed M.;Angeloni, Simone;Borsetta, Germana;Vittori, Sauro;Maggi, Filippo;Sagratini, Gianni;Caprioli, Giovanni. And the article was included in Molecules in 2021.Recommanded Product: 868-57-5 This article mentions the following:

Strawberry is the most consumed berry fruit worldwide due to its unique aroma and flavor. Drying fruits to produce a powder represents one of the possible conservation methods to extend their shelf-life. The aim of the present study was to compare the influence of freezing and different drying methods on the volatile profile of strawberry using the HS-SPME/GC-MS method, in addition to anal. of strawberry jam volatiles. A total of 165 compounds were identified, accounting for 85.03-96.88% of the total volatile compositions Results and PCA showed that freezing and each drying process affected the volatile profile in a different way, and the most remarkable representative differential volatiles were Et hexanoate, hexyl acetate, (E)-2-hexenyl acetate, mesifurane, (E)-nerolidol, 纬-decalactone, 1-hexanol, and acetoin. Shade air-dried, frozen, freeze-dried, and oven-dried 45掳C samples retained more of the fruity and sweet aromas of strawberry, representing more than 68% of the total aroma intensity according to the literature. In contrast, the microwave-drying method showed drastic loss of fruity esters. Strawberry jams demonstrated complete destruction of esters and alcs. in most jams, while terpenes were significantly increased. These findings help better understand the aroma of strawberry and provide a guide for the effects of drying, freezing, and jam processing. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Recommanded Product: 868-57-5).

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. Polyesters are important plastics, with monomers linked by ester moieties. 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: 868-57-5

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

Metal-Free Cross-Dehydrogenative C-O Coupling of Carbonyl Compounds with N-Hydroxyimides: Unexpected Selective Behavior of Highly Reactive Free Radicals at an Elevated Temperature was written by Krylov, Igor B.;Lopat’eva, Elena R.;Budnikov, Alexander S.;Nikishin, Gennady I.;Terent’ev, Alexander O.. And the article was included in Journal of Organic Chemistry in 2020.Quality Control of Methyl2-methylbutyrate This article mentions the following:

Cross-dehydrogenative C-O coupling of N-hydroxyimides with ketones, esters, and carboxylic acids was achieved employing the di-tert-Bu peroxide as a source of free radicals and a dehydrogenating agent. The proposed method is exptl. simple and demonstrates the outstanding efficiency for the challenging CH substrates, such as unactivated esters and carboxylic acids. It was shown that N-hydroxyphthalimide drastically affects the oxidative properties of t-BuOOt-Bu by intercepting the t-BuO^{鈥?/sup> radicals with the formation of phthalimide-N-oxyl radicals, a species responsible for both hydrogen atom abstraction from the CH reagent and the selective formation of the C-O coupling product by selective radical cross-recombination. The practical applicability of the developed method was exemplified by the single-stage synthesis of com. reagent (known as Baran aminating reagent precursor) from isobutyric acid and N-hydroxysuccinimide, whereas in the standard synthetic approach, four stages are necessary. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Quality Control of Methyl2-methylbutyrate).}

Methyl2-methylbutyrate (cas: 868-57-5) 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. 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.Quality Control of Methyl2-methylbutyrate

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

Metal-Free Cross-Dehydrogenative C-O Coupling of Carbonyl Compounds with N-Hydroxyimides: Unexpected Selective Behavior of Highly Reactive Free Radicals at an Elevated Temperature was written by Krylov, Igor B.;Lopat’eva, Elena R.;Budnikov, Alexander S.;Nikishin, Gennady I.;Terent’ev, Alexander O.. And the article was included in Journal of Organic Chemistry in 2020.Quality Control of Methyl2-methylbutyrate This article mentions the following:

Cross-dehydrogenative C-O coupling of N-hydroxyimides with ketones, esters, and carboxylic acids was achieved employing the di-tert-Bu peroxide as a source of free radicals and a dehydrogenating agent. The proposed method is exptl. simple and demonstrates the outstanding efficiency for the challenging CH substrates, such as unactivated esters and carboxylic acids. It was shown that N-hydroxyphthalimide drastically affects the oxidative properties of t-BuOOt-Bu by intercepting the t-BuO^• radicals with the formation of phthalimide-N-oxyl radicals, a species responsible for both hydrogen atom abstraction from the CH reagent and the selective formation of the C-O coupling product by selective radical cross-recombination. The practical applicability of the developed method was exemplified by the single-stage synthesis of com. reagent (known as Baran aminating reagent precursor) from isobutyric acid and N-hydroxysuccinimide, whereas in the standard synthetic approach, four stages are necessary. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Quality Control of Methyl2-methylbutyrate).

Methyl2-methylbutyrate (cas: 868-57-5) 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. 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.Quality Control of Methyl2-methylbutyrate

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

Effects of modified atmosphere and sugar immersion on physiology and quality of fresh-cut ‘Braeburn’ apples was written by Rux, G.;Bohne, K.;Huyskens-Keil, S.;Ulrichs, Ch.;Hassenberg, K.;Herppich, W. B.. And the article was included in Food Packaging and Shelf Life in 2021.Safety of Methyl2-methylbutyrate This article mentions the following:

Fresh-cut fruits are highly perishable and show a short shelf life. Therefore, storage in sugar syrup is com. used to delay undesirable metabolic changes and to prevent browning. Investigations on the effects of syrup application on volatile organic compounds (VOCs), important for the consumers’ acceptance, are rare. It is, however, known that low O₂ availability, as found in fruit slices after immersion, may result in the formation of unwanted off-odor. This neg. affects the sensory quality of fresh-cuts. In the present study, fresh-cut ‘Braeburn’ apples were comparatively stored in air, in three modified atmospheres (O₂: 10, 5 and approx. 0%; CO₂: 10, 15 and 20%) or in sugar syrup (20% sugar content). Relevant quality, physiol. and microbiol. parameters were evaluated on days 3, 6 and 10 of storage. Particular focus was laid on the evaluation of VOC emission to indicate biosynthetic responses that affect aroma-relevant VOCs. Atm. storage of apple slices, among others, increased the emission of Et acetate, which may create off-odor and neg. affects the customers’ acceptance. In contrast, syrup-immersion of apple slices resulted in a pronounced loss of aroma but prevented the occurrence of off-odor. The results indicated metabolic changes, which were independent of O₂ availability. High CO₂ or VOCs concentrations in the fruit tissue may inhibit esterification or may induce a feedback inhibition of VOC synthesis. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Safety of 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. 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.Safety of Methyl2-methylbutyrate

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

Decoding carob flavor aroma using HS-SPME-GC-MS and chemometrics was written by Krokou, Andriana;Kokkinofta, Rebecca;Stylianou, Marinos;Agapiou, Agapios. And the article was included in European Food Research and Technology in 2020.Recommanded Product: 868-57-5 This article mentions the following:

Abstract: Ceratonia siliqua L. is quite popular for the sweetness of its fruit (“natural chocolate”) and the strong, persistent, characteristic odor that associates not only carob fruit, but also its traditional food products. This is due to the emission of an array of volatile organic compounds (VOCs). The released odor is a complex mixture, and therefore, needs to be separated prior detected, especially when its origin varies and is engaged. Therefore, Headspace-Solid-Phase Microextraction-Gas Chromatog.-Mass Spectrometry (HS-SPME-GC-MS) anal. was performed in ground carob pods from three different European countries to decode their released aroma. The method was applied to Cypriot (Kountourka, Koumpota, Tilliria), Spanish (Negra, Rojal, Matalafera) and Italian (Saccarata, Racemosa, Gibiliana) cultivars, and the released volatile species were further processed with multivariate data anal. (MDA). The chromatog. separation highlighted 54 common VOCs in the grounded carob pods; the most abundant appeared to be propanoic acid 2-Me (isobutyric acid), acetic acid, butanoic acid, hexanoic acid, and propanoic acid 2-methyl-Me ester. The quant. results for acetic acid, propanoic acid 2-Me, butanoic acid, furfural and pentanoic acid revealed their emission in the low ppb_v levels. The engage of MDA on the obtained results showed a clear differentiation of the carobs based on their geog. and botanical origin. The combination of HS-SPME-GC-MS and chemometrics contributes to the quality characterization of carobs and highlights their authenticity markers. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Recommanded Product: 868-57-5).

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.Recommanded Product: 868-57-5

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

Artemisia magellanica. Chemical composition of the essential oil from an unexplored endemic species of Patagonia was written by Gonzalez, Silvia B.;Gastaldi, Bruno;Catalan, Cesar;Di Leo Lira, Paola;Retta, Daiana;van Baren, Catalina M.;Bandoni, Arnaldo L.. And the article was included in Chemistry & Biodiversity in 2019.Electric Literature of C6H12O2 This article mentions the following:

The essential oil composition of the aerial parts of Artemisia magellanica Sch. Bip. (Asteraceae), native to Patagonia, was analyzed by GC-FID-MS. This is the first report on the essential oil composition of A. magellanica. A total of 113 components were identified accounting for 95.6-95.7% of the oil. The essential oil was characterized by a high percentage of γ-costol (21.0-43.5%), selina-4,11-diene, (Z)-β-ocimene, (E)-β-farnesene, (Z)-en-yn-dicycloether and 23 different esters (28.7%). In turn, Artemisia biennis, a species native to North America, which is considered by some authors to be conspecific with A. magellanica, yielded an essential oil that was rich in (Z)-β-ocimene (34.7%), (E)-β-farnesene (40.0%) and the acetylenes (Z)- and (E)-en-yn-dicycloethers (11.0%). Thus, as A. biennis lacks the three main components present in A. magellanica, namely γ-costol, 2-methylbutyl 2-methylbutyrate and selina-4,11-diene, these compounds could be considered as potential chem. markers for A. magellanica since they are absent or only found as minor constituents in other members of the genus. The data presented herein is also useful for genus taxonomy. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Electric Literature of C6H12O2).

Methyl2-methylbutyrate (cas: 868-57-5) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Electric Literature of C6H12O2

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

Simultaneous chemical and sensory analysis of domestic cat urine and feces with headspace solid-phase microextraction and GC-MS-olfactometry was written by Banik, Chumki;Koziel, Jacek A.;Li, James Z.. And the article was included in Separations in 2021.HPLC of Formula: 868-57-5 This article mentions the following:

The association between humans and cats (Felis catus) is well known. This domestic animal is also known for its malodorous urine and feces. The complexity of the odorous urine and feces impacts human life by triggering the human sensory organ in a neg. way. The objective of this research was to identify the volatile organic chems. (VOCs) and associated odors in cat urine and feces using gas chromatog.-mass spectrometry and simultaneous sensory anal. of fresh and aged samples. The solid-phase microextraction (SPME) technique was used to preconc. the VOCs emitted from urine or feces samples. Twenty-one compounds were identified as emitted from fresh urine, whereas 64 compounds were emitted from fresh feces. A contrasting temporal impact was observed in the emission of VOCs for urine and feces. On aging, the emission increased to 34 detected chems. for stale urine, whereas only 12 chems. were detected in stale feces. Not all compounds were malodorous; some compounds had a pleasant hedonic smell to the human nose. Although trimethylamine, low-mol.-weight organic acids, and ketones were contributors to the odor to some extent, phenolic compounds and aromatic heterocyclic organic N compounds generated the most intense odors and substantially contributed to the overall malodor, as observed by this study. This work might be useful to formulate cat urine and feces odor remediation approaches to reduce odor impacts. 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 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.HPLC of Formula: 868-57-5

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

Evaluation of microbial, physicochemical parameters and flavor of blueberry juice after microchip-pulsed electric field was written by Zhu, Ning;Zhu, Yue;Yu, Ning;Wei, Yulong;Zhang, Jiaying;Hou, Yanan;Sun, Ai-dong. And the article was included in Food Chemistry in 2019.Formula: C6H12O2 This article mentions the following:

The effect of microchip-pulsed elec. field (MPEF) and high temperature short time sterilization (HTST) technologies on microbiol., physicochem. properties and flavor of freshly squeezed blueberry juice were compared. Under the MPEF treatment at 350 V, total plate count, total yeast and molds were completely inactivated, meanwhile, Vitamin C, anthocyanin, total phenols, titratable acid and color had no significantly changes. During storage of 30 days at 4 °C, Vitamin C decreased by 11.52% and 26.78% after MPEF and HTST treatments, all treated juices showed to be microbiol. safe, whereas MPEF can protect nutritionally related properties and color of blueberry juice samples more efficiently. Besides, relatively small changes of juice in odor, taste and volatile compounds concentration was observed by MPEF treatment. Hence, application of MPEF may be an ideal alternative treatment to HTST processing in order to ensure longer shelf life, higher functional and nutritional values of blueberry juice. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Formula: C6H12O2).

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. 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: C6H12O2

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

gcProfileMakeR: an R package for automatic classification of constitutive and non-constitutive metabolites was written by Perez-Sanz, Fernando;Ruiz-Hernandez, Victoria;Terry, Marta I.;Arce-Gallego, Sara;Weiss, Julia;Navarro, Pedro J.;Egea-Cortines, Marcos. And the article was included in Metabolites in 2021.HPLC of Formula: 868-57-5 This article mentions the following:

Metabolomes comprise constitutive and non-constitutive metabolites produced due to physiol., genetic or environmental effects. However, finding constitutive metabolites and non-constitutive metabolites in large datasets is tech. challenging. We developed gcProfileMakeR, an R package using standard Excel output files from an Agilent Chemstation GC-MS for automatic data anal. using CAS numbers gcProfileMakeR has two filters for data preprocessing removing contaminants and low-quality peaks. The first function NormalizeWithinFiles, samples assigning retention times to CAS. The second function NormalizeBetweenFiles, reaches a consensus between files where compounds in close retention times are grouped together. The third function getGroups, establishes what is considered as Constitutive Profile, Non-constitutive by Frequency i.e., not present in all samples and Non-constitutive by Quality. Can be plotted with the plotGroup function. We used it to analyze floral scent emissions in four snapdragon genotypes. These included a wild type, Deficiens nicotianoides and compacta affecting floral identity and RNAi:AmLHY targeting a circadian clock gene. We identified differences in scent constitutive and non-constitutive profiles as well as in timing of emission. gcProfileMakeR is a very useful tool to define constitutive and non-constitutive scent profiles. It also allows to analyze genotypes and circadian datasets to identify differing metabolites. 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. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.HPLC of Formula: 868-57-5

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