Category: 868-57-5

Flavor differences between commercial and traditional soybean paste was written by Zhang, Xiao;Wei, Jianping;Zhao, Shiyu;Jia, Hang;Guo, Chunfeng;Wang, Zhouli;Gao, Zhenpeng;Yue, Tianli;Yuan, Yahong. And the article was included in LWT–Food Science and Technology in 2021.HPLC of Formula: 868-57-5 This article mentions the following:

Fermented soybean paste is becoming popular worldwide due to its umami taste and characteristic aroma. To elucidate the relationships between the odorants and the flavor differences of com. soybean paste (CSP) and traditional soybean paste (TSP), 49 samples (13 CSP, 36 TSP) were collected and evaluated in this research. The aroma-active compounds of CSP and TSP samples were analyzed by electronic nose, gas chromatog.-olfactometry-mass spectrometry combined with aroma extract dilution anal., and the key aroma compounds were identified by calculation of the detection rates and odor activity values. Following characterization, 23 and 19 odorants were identified as key aroma compounds contributing to flavor differences in CSP and TSP samples, resp. Significant differences were observed for the acids, alcs., aldehydes, terpenes, and sulfur-containing compounds The results showed that the flavor differences of the samples were more resulted from the concentrations of the key aroma compounds rather than their compositions and those differences mainly came from the long maturation period of TSP samples and heating process of CSP samples. Further, orthogonal partial least squares discrimination anal. revealed that the key aroma compounds identified in this research could explain the flavor differences of com. and traditional soybean pastes. 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 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.HPLC of Formula: 868-57-5

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

Characterization of the key aroma compounds in aged Zhenjiang aromatic vinegar by gas chromatography-olfactometry-mass spectrometry, quantitative measurements, aroma recombination and omission experiments was written by Zhou, Zhilei;Jian, Dongzhen;Gong, Min;Zhu, Shenghu;Li, Guoquan;Zhang, Si;Zhong, Fang;Mao, Jian. And the article was included in Food Research International in 2020.Recommanded Product: 868-57-5 This article mentions the following:

Zhenjiang aromatic vinegar (ZAV) is one of the most famous traditional Chinese cereal vinegars. The key aroma compounds in aged ZAV were characterized by gas chromatog.-olfactometry-mass spectrometry (GC-O-MS), odor activity values (OAVs), aroma recombination and omission experiments Sensory anal. revealed that higher odor intensity of caramel-like, buttery and overall complexity were observed for aged ZAV compared with fresh ZAV. A total of 68 compounds were quantitated, including 27 odorants with OAVs >1.0 in the aged ZAV. Sotolon was detected for the first time in Chinese cereal vinegars. Furthermore, the levels of 2,3-butanedione, 2-methylpropanal, sotolon, di-Me trisulfide, 3-hydroxy-2-butanone, 2,4,5-trimethyloxazole and tetramethylpyrazine changed significantly during the aging process. Aroma recombination revealed that the aroma profile of the aged vinegar could be closely simulated. Omission experiments demonstrated the important contributions of seven aroma compounds to the aged ZAV aroma, including 2,3-butanedione, acetic acid, 2-methylpropanal, sotolon, 2,4,5-trimethyloxazole, 3-methylbutanoic acid and tetramethylpyrazine. This study indicates that the aging process substantially contribute to the overall aroma of ZAV. 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. 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. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is 绾?valerolactone.Recommanded Product: 868-57-5

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

Acidification of Strawberry Puree Affects Color and Volatile Characteristics during Storage was written by Teribia, Natalia;Buve, Carolien;Bonerz, Daniel;Aschoff, Julian;Hendrickx, Marc E.;Van Loey, Ann M.. And the article was included in ACS Food Science & Technology in 2021.Formula: C6H12O2 This article mentions the following:

Color degradation of strawberry-based products neg. affects consumer acceptance of these products. To improve the color stability of strawberry puree during storage, an acidification step (pH 1.5 and 2.5) prior to pasteurization was performed and quality changes of strawberry puree during storage (35鎺矯, 40 days) were monitored. Acidification prior to pasteurization resulted in an improved color and anthocyanin stability. However, the volatile fraction of strawberry puree was neg. influenced by acidification of the puree. Low acidic conditions (pH 1.5) resulted in the hydrolysis of esters, oxidation of terpene oxides, and acid-catalyzed reactions of terpene alcs. during storage. The volatile fraction of strawberry puree stored at pH 2.5 and 3.5 (the latter being the original strawberry puree) were more similar. Furthermore, after 4 days of storage, the pH of the acidified purees was brought back to the natural pH of the system (3.5) and subsequently thermally treated and stored. During this second storage, color showed a slightly faster degradation rate in those purees that were previously acidified, whereas anthocyanins exhibited similar trends suggesting that the advantage of acidification to preserve color would be beneficial after thermal processing, but more limited during storage of the regenerated product (second storage). 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. 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.Formula: C6H12O2

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

Direct authentication of three Chinese materia medica species of the Lilii Bulbus family in terms of volatile components by headspace-gas chromatography-ion mobility spectrometry was written by Yuan, Zhi-ying;Qu, Hao-yu;Xie, Meng-zhou;Zeng, Guang;Huang, Hui-yong;Ren, Fang;Chen, Nai-hong. And the article was included in Analytical Methods in 2019.Product Details of 868-57-5 This article mentions the following:

Juandan-Baihe (Lilium lancifolium Thunb.), Lanzhou-Baihe (Lilium davidii var. unicolor), and Jin-Baihe (Lilium trompeten) are of the same family, but of different genera. They have often been used in Chinese Materia Medica (CMM) as Lilii Bulbus in the Chinese market. These three species of CMM are often confused, and thus, for better application, they must be accurately identified. Herein we use a headspace-gas chromatog.-ion mobility spectrometry (HS-GC-IMS) technique as a screening system to authenticate the three species of CMM. The obtained ion mobility data were processed using LAV processing software to identify fingerprints and perform principal component anal. (PCA). From the fingerprints, fifty peaks, for 36 compounds, were identified, among which 3-methylbutanal was the most abundant in Lilium lancifolium Thunb. (JD), butanone was the most abundant in Lilium davidii var. unicolor (LZ), and 3-methylbutanoic acid and 2-heptanone were the most abundant in Lilium trompeten (WP). All three species have a characteristic area in the fingerprint containing their characteristic biomarker. The PCA for the initial solution to original variables showed that the two principal components accounted for 53% and 21% of the total variance. This research is aimed at establishing a green, rapid method based on HS-GC-IMS to provide scientific data for discrimination between Lilii Bulbus from different species. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Product Details of 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. 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.Product Details of 868-57-5

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

Changes in Physicochemical Properties and Volatile Compounds of Roselle (Hibiscus sabdariffa L.) Calyx during Different Drying Methods was written by Juhari, Nurul Hanisah;Martens, Helle Jakobe;Petersen, Mikael Agerlin. And the article was included in Molecules in 2021.Category: esters-buliding-blocks This article mentions the following:

Fresh roselle are high in moisture and deteriorate easily, which makes drying important for extending shelf-life and increasing availability. This study investigated the influence of different drying methods (oven-drying, freeze-drying, vacuum-drying, and sun-drying) on the quality of roselle calyx expressed as physicochem. properties (moisture content, water activity, soluble solids, color), volatile compounds, and microstructure. Oven-drying and freeze-drying reduced moisture content most while vacuum-drying and sun-drying were not as efficient. All drying methods except sun-drying resulted in water activities low enough to ensure safety and quality. Vacuum-drying had no impact on color of the dry calyx and only small impact on color of water extract of calyx. Drying reduced terpenes, aldehydes, and esters but increased furans. This is expected to reduce fruity, floral, spicy, and green odors and increase caramel-like aroma. Sun-drying produced more ketones, alcs., and esters. SEM revealed that freeze-drying preserved the cell structure better, and freeze-dried samples resembled fresh samples most compared to other drying techniques. The study concludes that freeze-drying should be considered as a suitable drying method, especially with respect to preservation of structure. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Category: esters-buliding-blocks).

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. Esters contain a carbonyl center, which gives rise to 120鎺?C閳ユ弲閳ユ彊 and O閳ユ弲閳ユ彊 angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C閳ユ彊閳ユ弲 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. Category: esters-buliding-blocks

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, 绾?decalactone, 1-hexanol, and acetoin. Shade air-dried, frozen, freeze-dried, and oven-dried 45鎺矯 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^{閳?/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

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

Direct authentication of three Chinese materia medica species of the Lilii Bulbus family in terms of volatile components by headspace-gas chromatography-ion mobility spectrometry was written by Yuan, Zhi-ying;Qu, Hao-yu;Xie, Meng-zhou;Zeng, Guang;Huang, Hui-yong;Ren, Fang;Chen, Nai-hong. And the article was included in Analytical Methods in 2019.Product Details of 868-57-5 This article mentions the following:

Juandan-Baihe (Lilium lancifolium Thunb.), Lanzhou-Baihe (Lilium davidii var. unicolor), and Jin-Baihe (Lilium trompeten) are of the same family, but of different genera. They have often been used in Chinese Materia Medica (CMM) as Lilii Bulbus in the Chinese market. These three species of CMM are often confused, and thus, for better application, they must be accurately identified. Herein we use a headspace-gas chromatog.-ion mobility spectrometry (HS-GC-IMS) technique as a screening system to authenticate the three species of CMM. The obtained ion mobility data were processed using LAV processing software to identify fingerprints and perform principal component anal. (PCA). From the fingerprints, fifty peaks, for 36 compounds, were identified, among which 3-methylbutanal was the most abundant in Lilium lancifolium Thunb. (JD), butanone was the most abundant in Lilium davidii var. unicolor (LZ), and 3-methylbutanoic acid and 2-heptanone were the most abundant in Lilium trompeten (WP). All three species have a characteristic area in the fingerprint containing their characteristic biomarker. The PCA for the initial solution to original variables showed that the two principal components accounted for 53% and 21% of the total variance. This research is aimed at establishing a green, rapid method based on HS-GC-IMS to provide scientific data for discrimination between Lilii Bulbus from different species. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Product Details of 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. 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.Product Details of 868-57-5

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

Changes in Physicochemical Properties and Volatile Compounds of Roselle (Hibiscus sabdariffa L.) Calyx during Different Drying Methods was written by Juhari, Nurul Hanisah;Martens, Helle Jakobe;Petersen, Mikael Agerlin. And the article was included in Molecules in 2021.Category: esters-buliding-blocks This article mentions the following:

Fresh roselle are high in moisture and deteriorate easily, which makes drying important for extending shelf-life and increasing availability. This study investigated the influence of different drying methods (oven-drying, freeze-drying, vacuum-drying, and sun-drying) on the quality of roselle calyx expressed as physicochem. properties (moisture content, water activity, soluble solids, color), volatile compounds, and microstructure. Oven-drying and freeze-drying reduced moisture content most while vacuum-drying and sun-drying were not as efficient. All drying methods except sun-drying resulted in water activities low enough to ensure safety and quality. Vacuum-drying had no impact on color of the dry calyx and only small impact on color of water extract of calyx. Drying reduced terpenes, aldehydes, and esters but increased furans. This is expected to reduce fruity, floral, spicy, and green odors and increase caramel-like aroma. Sun-drying produced more ketones, alcs., and esters. SEM revealed that freeze-drying preserved the cell structure better, and freeze-dried samples resembled fresh samples most compared to other drying techniques. The study concludes that freeze-drying should be considered as a suitable drying method, especially with respect to preservation of structure. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Category: esters-buliding-blocks).

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. Esters contain a carbonyl center, which gives rise to 120掳 C鈥揅鈥揙 and O鈥揅鈥揙 angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C鈥揙鈥揅 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. Category: esters-buliding-blocks

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