Tag: M.W=150-200

Chen, Xiaohua published the artcileAroma characterization of Hanzhong black tea (Camellia sinensis) using solid phase extraction coupled with gas chromatography-mass spectrometry and olfactometry and sensory analysis, Computed Properties of 21834-92-4, the main research area is aroma compound Hanzhong black tea solid extraction; Aroma; GC; Odor; Olfactometry; Sensory; Solid phase extraction; Tea.

The unique aroma of the Hanzhong black tea is due to the special location of the harvesting place and specific manufacturing processes. In this study, a solid phase extraction method (SPE) as sample preparation tool was combined with gas chromatog. (GC) as separation technique and several detection systems such as mass spectrometry (MS), flame ionization (FID) and olfactometry (O), which, together with sensorial anal. were used to characterize aroma compounds in Hanzhong black tea infusion. Seventy three aroma compounds were identified and quantified in the tea infusion by the GC-MS and GC-FID methods, resp. Among them, odor perceptions of 24 compounds were characterized by the GC-O anal. It was found that linalool oxide I, II and III, E,E-2,4-nonadienal, 4,5-dimethyl-3-hydroxy-2,5-dihydrofuran-2-one, 1-octen-3-one, E,Z-2,6-nonadienal, bis(2-methyl-3-furyl) disulfide had higher odor activity value in the tea infusion and offered floral, fatty, and caramel, mushroom, cucumber, and cooked beef -like odors, resp. Overall, floral and mushroom and caramel -like odors significantly dominated in the Hanzhong black tea infusion.

Food Chemistry published new progress about Black tea beverages. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Computed Properties of 21834-92-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Yin, Xia published the artcileIdentification of volatile and odor-active compounds in Hunan black tea by SPME/GC-MS and multivariate analysis, COA of Formula: C13H16O, the main research area is Hunan black tea SPME GCMS.

Hunan black tea is well-known for its floral-honey aroma, but the volatile components responsible for the fragrance have not been elucidated yet. In this study, the volatile compounds in Hunan black tea were identified and quantified by the headspace solid-phase microextraction coupled with gas chromatog.-mass spectrometry (HS-SPME-GC-MS). The results showed that 88 compounds were extracted and determined in Hunan black tea, including the dominant components Geraniol, phenethyl alc., phenylacetaldehyde, linalool, nonanal and other 5 aromatic compounds Furthermore, the aroma-active compounds were identified by odor activity value (OAV). It was found that 24 aroma compounds, including geraniol with an OAV� were regarded as the primary active aromatic compounds in Hunan black tea. Finally, partial least squares (PLS) regression anal. was employed and results revealed that Nonanal, trans-nerolidol, benzyl alc., and phenylethanol exhibit a pos. correlation with the intensity of floral and sweet honey aromas. Overall, this study identified the volatile compounds responsible for the dominant floral-honey aroma in Hunan black tea.

LWT–Food Science and Technology published new progress about Black tea beverages. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, COA of Formula: C13H16O.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Shi, Jiale published the artcileBoron carbonitride photocatalysts for direct decarboxylation: the construction of C(sp3)-N or C(sp3)-C(sp2) bonds with visible light, Name: 4-Methoxyphenylacetic acid, the main research area is boroncarbonitride photocatalyst preparation pore size distribution; pyrazole phenylacetic acid heterogeneous catalyst decarboxylation C N activation; benzyl pyrazole preparation green chem; methoxybenzene phenylacetic acid heterogeneous catalyst decarboxylation C H activation; benzylmethoxyarylbenzene preparation green chem.

A metal-free protocol was established for the decarboxylative N-H or C(sp2)-H functionalization of acids via metal-free boron carbon nitride (BCN) photocatalysis, delivering the desired products under ambient conditions. This methodol.was applicable to the late-stage modification of pharmaceutical mols. and gram-scale experiments as well as in the recovery and reuse of the photocatalysts without the loss of reactivity. The developed photochem. reaction system fulfills the requirements of green and sustainable chem.

Green Chemistry published new progress about C-H bond activation. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Name: 4-Methoxyphenylacetic acid.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Brugman, Sander J. T. published the artcileThe crystal structures of four dimethoxybenzaldehyde isomers, Formula: C9H10O3, the main research area is methoxybenzaldehyde isomer crystal structure; crystal structure; di­meth­oxy­benzaldehyde; polymorphism.

The crystal structures of four dimethoxybenzaldehyde (C9H10O3) isomers, namely the 2,3-, 2,4-, 2,5- and 3,5- isomers, are reported and compared to the previously reported crystal structures of 3,4-dimethoxybenzaldehyde and 2,6-dimethoxybenzaldehyde. All dimethoxybenzaldehyde mols. in the crystal structures are nearly planar. The largest deviation (1.2 Å) from the aromatic plane is found for one of the methoxy groups of 2,3-dimethoxybenzaldehyde. Upon rapid cooling of 3,4-dimethoxybenzaldehyde and 3,5-dimethoxybenzaldehyde, a metastable polymorph is formed. The crystal studied for the 3,5- isomer was refined as a two-component twin.

Acta Crystallographica, Section E: Crystallographic Communications published new progress about Crystal polymorphism. 86-51-1 belongs to class isoquinoline, name is 2,3-Dimethoxybenzaldehyde, and the molecular formula is C9H10O3, Formula: C9H10O3.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Ntlhokwe, Gaalebalwe published the artcileDetailed qualitative analysis of honeybush tea (Cyclopia spp.) volatiles by comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry and relation with sensory data, Safety of 5-Methyl-2-phenylhex-2-enal, the main research area is volatile compound Cyclopia honeybush tea 2D GC MS; Comprehensive two-dimensional gas chromatography (GC × GC); Honeybush tea; Sensory profiling; Thermal modulation; Time-of-flight mass spectrometry.

The volatile composition of honeybush (Cyclopia) species was studied by comprehensive two-dimensional gas chromatog. coupled to time-of-flight mass spectrometry (GC × GC-TOF-MS). Headspace-solid phase micro-extraction (HS-SPME) was used to extract the volatile compounds from tea infusions prepared from the three species C. genistoides, C. maculata and C. subternata. A total of 287 compounds were identified, 101 of which were confirmed using reference standards, while the remainder were tentatively identified using mass spectral and retention index (RI) data. The identification power of TOF-MS enabled the tentative identification of 147 compounds for the first time in honeybush tea. The majority of the compounds identified were common to all three Cyclopia species, although there were differences in their relative abundances, and some compounds were unique to each of the species. In C. genistoides, C. maculata and C. subternata 265, 257 and 238 compounds were identified, resp. Noteworthy was the tentative identification of cinnamaldehyde in particular C. maculata samples, which points to the likely contribution of this compound to their distinct sensory profiles. This study emphasizes the complexity of honeybush tea volatile composition and confirms the power of GC × GC combined with TOF-MS for the anal. of such complex samples.

Journal of Chromatography A published new progress about Cyclopia genistoides. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Safety of 5-Methyl-2-phenylhex-2-enal.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Chen, Wenchang published the artcileConcise syntheses of 13-methylprotoberberine and 13-methyltetrahydroprotoberberine alkaloids, Computed Properties of 86-51-1, the main research area is Pictet Spengler Friedel Crafts hydroxyalkylation dehydration oxidation enantioselective sequence; methylprotoberberine stereoselective preparation; methyltetrahydroprotoberberine stereoselective preparation; isoquinoline alkaloid one pot stereoselective preparation.

The concise syntheses of eight 13-methylprotoberberine (13-MePB) and eight enantioenriched 13-methyltetrahydroprotoberberine (13-MeTHPB) alkaloids have been achieved in a tactically modular fashion. This synthetic work features a one-pot metal-free Pictet-Spengler/Friedel-Crafts hydroxyalkylation/dehydration/oxidation sequence and a following highly enantioselective Ir-catalyzed hydrogenation. Given such brevity and modularity, our developed synthetic route would be greatly beneficial to the efficient syntheses of existing natural products and new fully synthetic variants of 13-MePB and 13-MeTHPB family.

Chinese Chemical Letters published new progress about Dehydration reaction. 86-51-1 belongs to class isoquinoline, name is 2,3-Dimethoxybenzaldehyde, and the molecular formula is C9H10O3, Computed Properties of 86-51-1.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Menon, A. Nirmala published the artcileStudies on the volatiles of cardamom (Elleteria cardamomum), Product Details of C11H12O3, the main research area is essential oil flavor aroma cardamom.

The original aroma compounds present in cardamom were isolated by Amberlite XAD-2 column chromatog. from fresh green cardamom and termed as OFFC (original flavor of fresh cardamom), distilling fresh green cardamom DOFC (distilled oil of fresh cardamom) and distilling com. cardamom DOCC (distilled oil of com. cardamom). They were analyzed by HRGC and GC-MS techniques. The major compounds did not show much variations in these samples, viz., 1,8 cineole and α-terpinyl acetate. Many sesquiterpene hydrocarbons were found to be present in the DOFC and not in OFFC. However, there were marked differences in the contents of other components. It was also observed that some new compounds were present in the oil of cardamom.

Journal of Food Science and Technology published new progress about Elettaria cardamomum. 1205-17-0 belongs to class isoquinoline, name is 2-Methyl-3-(3,4-methylenedioxyphenyl)propionaldehyde, and the molecular formula is C11H12O3, Product Details of C11H12O3.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Wetzel, Christian H. published the artcileSpecificity and sensitivity of a human olfactory receptor functionally expressed in human embryonic kidney 293 cells and Xenopus laevis oocytes, Synthetic Route of 1205-17-0, the main research area is olfactory receptor recombinant expression Xenopus oocyte.

Here, we provide evidence for functional expression of a human olfactory receptor protein (OR17-40) and show that recombinant olfactory receptors can be functionally expressed in heterologous systems. A mixture of 100 different odorants (Henkel 100) elicited a transient increase in intracellular [Ca2+] in human embryonic kidney 293 (HEK293) cells stably or transiently transfected with the plasmid pOR17-40. By subdividing the odorant mixture into progressively smaller groups, we identified a single component that represented the only effective substance: helional. Only the structurally closely related mol. heliotroplyacetone also activated the receptor. Other compounds, including piperonal, safrole, and vanillin, were completely ineffective. Mock-transfected cells and cells transfected with other receptors showed no change in intracellular [Ca2+] in response to odor stimulation. We were also able to functionally express OR17-40 in Xenopus laevis oocytes. Coexpression of a “”reporter”” channel allowed measurement of the response of oocytes injected with the cRNA of the human receptor to the odor mixture Henkel 100. The effective substances were the same (helional, heliotropylacetone) as those identified by functionally expressing the receptor in HEK293 cells and were active at the same, lower micromolar concentration These findings open the possibility of now characterizing the sensitivity and specificity of many, if not all, of the hundreds of different human olfactory receptors.

Journal of Neuroscience published new progress about Human cell line 293T. 1205-17-0 belongs to class isoquinoline, name is 2-Methyl-3-(3,4-methylenedioxyphenyl)propionaldehyde, and the molecular formula is C11H12O3, Synthetic Route of 1205-17-0.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Zhang, Chunlin published the artcileCharacterization of volatile compounds from Daqu-a traditional Chinese liquor fermentation starter, Application In Synthesis of 21834-92-4, the main research area is volatile compound Daqu liquor.

Daqu is a fermentation starter and substrate complex that is used to initiate the solid fermentations for the production of Chinese liquor. The aroma of Daqu is one of the most important factors that influence the flavor of Chinese liquor. To further study the aroma of Daqu, volatile compounds in ten Daqu samples were extracted by headspace solid-phase microextraction (HS-SPME) and analyzed by gas chromatog.-mass spectrum (GC-MS). The samples were pre-equilibrated at 50 °C for 10 min and extracted with stirring at the same temperature for 30 min prior to injection into a GC-MS. A total of 75 volatile compounds were characterised by GC-MS, including twelve alcs., eleven esters, eight acids, nine aromatic compounds, four phenols, two furans, fourteen nitrogen-containing compounds and fifteen aldehydes and ketones. By a principal component anal. (PCA), the ten Daqu samples could be classified into three groups according to their origins and, in particular, the production technologies.

International Journal of Food Science and Technology published new progress about Alcoholic beverages. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Application In Synthesis of 21834-92-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Fang, Cheng published the artcileCompositional differences and similarities between typical chinese baijiu and western liquor as revealed by mass spectrometry-based metabolomics, Application of 5-Methyl-2-phenylhex-2-enal, the main research area is baijiu western liquor compositional difference mass spectrometry metabolomics; GC-TOFMS; HS-SPME-GC-TOFMS; distilled liquor; metabolomics; non-volatile compounds; volatile compounds.

Distilled liquors are important products, both culturally and economically. Chem., as a complex mixture, distilled liquor comprises various chem. compounds in addition to ethanol. However, the chem. components of distilled liquors are still insufficiently understood and compositional differences and similarities of distilled liquors from different cultures have never been compared. For the first time, both volatile organic compounds (VOCs) and non-VOCs in distilled liquors were profiled using mass spectrometry-based metabolomic approaches. A total of 879 VOCs and 268 non-VOCs were detected in 24 distilled liquors including six typical Chinese baijiu and 18 typical Western liquors. Principal component anal. and a correlation network revealed important insights into the compositional differences and similarities of the distilled liquors that were assessed. Et esters, a few benzene derivatives, and alcs. were shared by most distilled liquors assessed, suggesting their important contribution to the common flavor and mouthfeel of distilled liquors. Sugars and esters formed by fatty alc. differ significantly between the assessed Chinese baijiu and Western liquors, and are potential marker compounds that could be used for their discrimination. Factors contributing to the differences in chem. composition are proposed. Our results improve our understanding of the chem. components of distilled liquors, which may contribute to more rigorous quality control of alc. beverages.

Metabolites published new progress about Alcoholic beverages. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Application of 5-Methyl-2-phenylhex-2-enal.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem