Tag: 100-200

Changes in aroma components and potential Maillard reaction products during the stir-frying of pork slices was written by Wang, Zhouli;Cai, Rui;Yang, Xiandong;Gao, Zhenpeng;Yuan, Yahong;Yue, Tianli. And the article was included in Food Control in 2021.HPLC of Formula: 868-57-5 This article mentions the following:

Stir-fried pork slices are kinds of traditional pork processing products in China, which are usually cooked at high temperature with different seasonings. Because of their special quality and flavor, these products gain consumers â€?preference. However, there are few studies on their physicochem. properties, aroma composition and safety. In this study, the changes in basic components, aroma components and potentially hazardous substances during the stir-frying of pork slices were determined The effects of the different ratios of fat meat to lean meat and vinegar on these indicators were evaluated, and the formation of potential Maillard reaction products was also analyzed. The results indicated that water content, chrominance values of L* and b* exhibited decreasing trends; a* value displayed a trend of decline first and then rising, while the fat content showed a rising trend during the processing. Appropriate stir-frying can promote the formation of aldehydes, while the content of acids, ketones, and terpenes decreased during processing. The change of alcs. has no obvious rule. Some sulfur compounds not found in raw meat were also detected. Different ratios of fat meat and lean meat changed the kinds of aroma components, while vinegar altered the types and their contents. Besides, the contents of acrylamide and 5-HMF changed significantly, and that of benzo(a)pyrene remained at a low level. The addition of vinegar can enhance the amount of acrylamide and 5-HMF but has no obvious effect on benzo(a)pyrene. Besides, 8 kinds of Maillard reaction products (acrylamide, 5-HMF, benzo(a)pyrene, 5-methylfurfural, pyrazine, 4-methylimidazole, pyrraline, and 5- hydroxymethyl – 2-furancarboxylic acid) were determined, and some of them were harmful to product quality and human health. The results showed that the processing time of pork slices should be controlled within 60 min. 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 typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. 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.HPLC of Formula: 868-57-5

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

Lewis base catalyzed asymmetric hydrosilylation of α-substituted β-enamino esters: facile access to enantioenriched β²-amino esters via dynamic kinetic resolution was written by Shu, Chang;Hu, Xiao-Yan;Li, Shuai-Shuai;Yuan, Wei-Cheng;Zhang, Xiao-Mei. And the article was included in Synlett in 2014.Name: Ethyl 2-(4-fluorophenyl)acetate This article mentions the following:

A chiral Lewis base organocatalyzed asym. hydrosilylation of α-substituted β-enamino esters H₅C₂C(O)OC(R):CHNH(PMP) [R = 3,4-(OCH₃)₂C₆H₃, piperonyl, 2-naphthyl, 2-thienyl, etc.] was presented. The reactions proceeded through dynamic kinetic resolution and mild synthesis of various enantioenriched β²-amino ester derivatives H₅C₂COC(O)C(R)CH₂NH(PMP) with high yields (up to 98%) in moderate enantioselectivities (up to 77% ee). In the experiment, the researchers used many compounds, for example, Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2Name: Ethyl 2-(4-fluorophenyl)acetate).

Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2) 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° 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. Name: Ethyl 2-(4-fluorophenyl)acetate

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

Identification of the novel odor active compounds “p-menthane lactones” responsible for the characteristic aroma of fresh peppermint leaf was written by Shigeto, Atsushi;Wada, Atsushi;Kumazawa, Kenji. And the article was included in Bioscience, Biotechnology, and Biochemistry in 2020.Reference of 868-57-5 This article mentions the following:

The comparative aroma extract dilution anal. (cAEDA) applied to the volatile fractions of two types of fresh mint leaves (Peppermint and Spearmint) revealed 20 odor-active peaks with high FD factors (â‰?4). Among the perceived odorants, five “sweet/milky” and “caramel-like/spicy” notes showing high FD factors were characteristic for the peppermint aroma, and were identified as p-menthane lactone derivatives Especially, the three p-menthane lactone derivatives, “rel-(3S,3aS,6R,7aS)-dihydromintlactone, (3S,3aS,6R)-epoxymenthofurolactone, and 2E-ethylidene-5-methylcyclohexanone”, were newly identified compounds in the peppermint. The biosynthetic routes of the p-menthane lactone derivatives have been suggested to be closely related to menthofuran. Therefore, these findings strongly suggest the possibility that the biosynthetic pathway leading to the p-menthane lactone derivatives via menthofuran plays a significantly important role in the formation of the characteristic aroma of peppermint. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Reference of 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. 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.Reference of 868-57-5

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

1,5-Diketones Synthesis via Three-Component Cascade Reaction was written by Xing, Li-Juan;Lu, Tao;Fu, Wei-Li;Lou, Mei-Mei;Chen, Bo;Wang, Zhi-Shen;Jin, Yang;Li, Dan;Wang, Bin. And the article was included in Advanced Synthesis & Catalysis in 2015.Formula: C9H10O3S This article mentions the following:

A mild and efficient cascade synthesis of 1,5-diketones from readily available N,N-dicyclohexylmethylamine, 1,3-dicarbonyl compounds, and trifluoromethyl β-diketones has been developed. This cascade reaction occurs via an oxidation/Mannich reaction/Cope elimination/Michael addition/retro-Claisen reaction sequence, and provides multiple C-C bond formations in one pot. In addition, exquisite chemoselectivity is achieved in the reaction between 1,3-dicarbonyl compounds and trifluoromethyl β-diketones. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8Formula: C9H10O3S).

Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8) 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. 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.Formula: C9H10O3S

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

The impact of Hanseniaspora vineae fermentation and ageing on lees on the terpenic aromatic profile of white wines of the albillo variety was written by Del Fresno, Juan Manuel;Escott, Carlos;Loira, Iris;Carrau, Francisco;Cuerda, Rafael;Schneider, R. Emi;Banuelos, Maria Antonia;Alez, Carmen Gonz;Arez-Lepe, Jos E. Antonio Su;Morata, Antonio. And the article was included in International Journal of Molecular Sciences in 2021.Synthetic Route of C9H10O3 This article mentions the following:

Hanseniaspora vineae is a non-Saccharomyces yeast that has a powerful impact on the sensory profile of wines. Its effect on the aromatic profile of non-aromatic grape varieties, such as Albillo Mayor (Vitis vinifera, L.), during vinification is a useful biotechnol. to improve sensory complexity. Fermentation in steel barrels using Hanseniaspora vineae and sequential inoculation with Saccharomyces cerevisiae have been used to study the formation of terpenes and cell lysis in the production of Albillo white wines. The GC-MS anal. profile shows a significant effect of H. vineae fermentation on the contents of terpenes (≈Ã?3), mainly in linalool (>× 3), β-citronellol (>× 4), geraniol (>× 2) and a-terpineol (≈Ã?2). The contents of several polyoxygenated terpenes and some volatile phenols with a spicy aroma were increased during fermentation In summary, Hanseniaspora vineae releases a large number of cell wall polysaccharides during fermentation that affect wine palatability and structure. Hanseniaspora vineae is a powerful bio-tool to enhance the fruitiness, floral notes and freshness in non-aromatic white varieties. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Synthetic Route of C9H10O3).

Ethyl 2-hydroxybenzoate (cas: 118-61-6) 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. 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.Synthetic Route of C9H10O3

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

Derivatives of 1-methoxy-3-trimethylsilyloxy-1,3-butadiene for Diels-Alder reactions was written by Danishefsky, Samuel;Yan, Cheng-Feng;Singh, Rajendra K.;Gammill, Ronald B.;McCurry, Patrick M. Jr.;Fritsch, Nancy;Clardy, Jon. And the article was included in Journal of the American Chemical Society in 1979.Safety of Methyl 4-Hydroxy-2-methoxybenzoate This article mentions the following:

The preparation and Diels-Alder cycloadditions of the following highly functionalized dienes are described: (1) (E)-1-methoxy-2-methyl-3-trimethylsilyloxy-1,3-butadiene, (2) (E,Z)-1-methoxy-3-trimethylsilyloxy-4-methyl-1,3-butadiene, (3) (E,Z)-1-methoxy-2,4-dimethyl-3-trimethylsilyloxy-1,3-butadiene, (4) (E,Z)-1-methoxy-3-trimethylsilyloxy-4-phenylseleno-1,3-butadiene, and (5) 1,1-dimethoxy-3-trimethylsilyloxy-1,3-butadiene. The use of these dienes in Diels-Alder reactions enables rapid access to diversely functionalized aromatics, cyclohexenones, cyclohexadienones, and 3-methoxycyclohexenones. In the experiment, the researchers used many compounds, for example, Methyl 4-Hydroxy-2-methoxybenzoate (cas: 28478-46-8Safety of Methyl 4-Hydroxy-2-methoxybenzoate).

Methyl 4-Hydroxy-2-methoxybenzoate (cas: 28478-46-8) 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 4-Hydroxy-2-methoxybenzoate

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

Three-dimensional quantitative structure-activity relationship study on gas chromatographic retention index of the fragrance compounds of Liliumspp was written by Jiao, Long;Wang, Yuan;Tai, Wenliang;Liu, Huanhuan;Xue, Zhiwei;Wang, Yanzhao. And the article was included in Sepu in 2020.Application of 118-61-6 This article mentions the following:

Quant. structure-activity relationship models on the gas chromatog. retention index of the 38 volatile fragrance compounds of Liliumspp were investigated and established by comparative mol. field anal. (CoMFA) and comparative mol. similarity index (CoMSIA) methods. The robustness and predictive performance of the developed models were assessed using external test set validation and leave-one-out cross validation. Further, the effects of the mol. structure on the gas chromatog. retention indexes of these compounds were intuitively studied in light of the three-dimensional contour maps of mol. fields provided by the developed CoMSIA and CoMFA models. The validation results demonstrated that both the models could accurately predict the retention indexes of the investigated components. The influence of the mol. structure on the retention indexes could be reasonably explained by these models. Moreover, the prediction accuracy of the CoMSIA model was slightly higher than that of the CoMFA model. Obviously, the proposed CoMSIA model is more promising for the anal. of the volatile fragrance compounds of Lilium spp. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Application of 118-61-6).

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. 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.Application of 118-61-6

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

(Pentamethylcyclopentadienyl)Iridium Dichloride Dimer {[IrCp*Cl₂]₂}: A Novel Efficient Catalyst for the Cycloisomerizations of Homopropargylic Diols and N-Tethered Enynes was written by Benedetti, Erica;Simonneau, Antoine;Hours, Alexandra;Amouri, Hani;Penoni, Andrea;Palmisano, Giovanni;Malacria, Max;Goddard, Jean-Philippe;Fensterbank, Louis. And the article was included in Advanced Synthesis & Catalysis in 2011.Synthetic Route of C10H14O4 This article mentions the following:

(Pentamethylcyclopentadienyl)iridium dichloride dimer {[IrCp*Cl₂]₂}-catalyzed hydroalkoxylation of bis-homopropargylic alcs. provides an efficient access to dioxabicyclo[2.2.1]ketals. The cycloisomerizations proceed under mild conditions, with low catalytic loadings and short reaction times. This new protocol involving an Ir(III) catalyst also promoted the cycloisomerization of nitrogen-tethered 1,6-enynes to give azabicyclo[4.1.0]heptenes, enhancing the synthetic potential of our method. In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Synthetic Route of C10H14O4).

Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) 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. 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.Synthetic Route of C10H14O4

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

Catalytic C-C coupling of diazo compounds with arylboronic acids: using surface modified sewage sludge as catalyst was written by Zhang, Zhipeng;Yu, Yang;Xie, Yuxing;Hughes, Timothy;Xu, Jun;Huang, Fei;Huang, He. And the article was included in Green Chemistry in 2020.Recommanded Product: 587-88-2 This article mentions the following:

A green, mild and efficient synthesis of diarylmethines I [R = Ac, Ph, 4-FC₆H₄, etc.; R¹ = H, Ph, 3-pyridyl, etc.; R² = Me, Et, Bn, etc.] using sewage sludge-derived carbonaceous materials (SW) by perchloric acid catalyzed coupling reactions between diazo compounds and arylboronic acids was developed. The reaction showed a high level of functional tolerance and a broad substrate scope. Furthermore, the highly selective 1,2-alkyl shift product chromenones II [R³ = H, 6-F, 6-Br; R⁴ = Me; R⁵ =Me, Et; R⁴R⁵ = (CH₂)₄, (CH₂)₂O(CH₂)₂, CH₂C(Me)₂(CH₂)₃] were furnished through the sterically demanding groups migration of diazo compounds (3-diazochromanone). The structures of 1,2-shift products were further confirmed by single-crystal X-ray anal. Significantly, the synthesis of the core structures of darifenacin (a clin. drug for overactive bladder syndrome, OAB) and diclofensine (a stimulant drug showing antidepressant and monoamine reuptake inhibitor activity) further demonstrated the efficacy and synthetic potential of this method. 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. 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.Recommanded Product: 587-88-2

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

Phenol Ethers with a Pseudo Allylic Chain, -(Me)C:CH₂ (III); Cresotinic Series; Synthesis of Thymol was written by Behal, A.;Tiffeneau, M.. And the article was included in Bulletin de la Societe Chimique de France in 1908.Synthetic Route of C10H12O3 This article mentions the following:

Me ether of pseudo-allylorthocresol (methyl-1-methoxy-2-pseudo-allylbenzene-3) MeC₆H₃(OMe)CMe:CH₂. o-Cresotinic acid, tech., m. 163°, is esterified (1) (2) (3) with MeOH and H₂SO₄. Me ester m. 28°-30°, b. 235°. CH₃MgI gives pseudoallyl-3-orthocresol, b. 220-225°, d₂₀ = 1.040, n_D²⁰ = 1.543. This has the odor of thyme. Me sulfate gives pseudo-allyl-3-methyl-1-anisol-2, b. 217-18°, d₀ = 0.9901, d₁₅ = 0.9830, n_D¹⁵ = 1.595. Reduction with Na and absolute alc. gives Me ether of isothymol, CH₃C₆H₃.OCH₃.CH(CH₃)₂, b. 210-3°, d₀ = 0.9559, d₁₉ = 0.9430, n_D¹⁹ = 1.50725. An isothymol is obtained by demethylating with HI. Me ether of pseudoallylmetacresol (methyl-1-methoxy-3-pseudo-allylbenzene-4), MeC₆H₃(OMe)CMe:CH₂. (1) (3) (4) Metacresotinic acid, m. 175-6°, is converted into its Me ester, b₁₂ 118-22°, d₀ = 1.1629, d₂₁ = 1.147, m. 27-8°. Methyl-methoxy-m-cresotinate, b. 259-61°, d₀ = 1.1462, gives on saponification, methoxy-m-cresotinic acid, m. 103°. CH₃MgI gives the alc., MeC₆H₃(OMe)CMe₂OH, b₁₁ 129-30°, d₀ = 1.0448, b. 240-6°. Dehydrated it gives methyl-1-methoxy-3-pseudo-allylbenzene-4, b. 216-9°, d₀ = 0.9835. Methylthymol, MeC₆H₃(OMe).C₃H₇, is obtained by reducing with Na and absolute alc. (1) (3) (4) the pseudo-allyl-4-methyl-1-methoxy-4-benzene and oxidizing the product with KMnO₄. Demethylation with HI yields thymol. In the experiment, the researchers used many compounds, for example, Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1Synthetic Route of C10H12O3).

Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1) 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. 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.Synthetic Route of C10H12O3

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