Category: alcohols-buliding-blocks

Pochec, Michal published the artcileInside out Approach to Rotator State in Hydrogen-Bonded System-Experimental and Theoretical Cross-Examination in n-Octanol, Synthetic Route of 111-87-5, the main research area is octanol hydrogen bonded system rotator state; CPMD; IR; NDE; PIMD; classical MD; intermolecular hydrogen bond; melting; n-octanol; premelting; solid state.

The exptl. and theor. description of premelting behavior is one of the most challenging tasks in contemporary material science. In this paper, n-octanol was studied using a multi-method approach to investigate it at macroscopic and mol. levels. The exptl. IR (IR) spectra were collected in the solid state and liquid phase at temperature range from -84°C to -15°C to detect temperature-related indicators of pretransitional phenomena. Next, the nonlinear dielec. effect (NDE) was measured at various temperatures (from -30°C to -15°C) to provide insight into macroscopic effects of premelting. As a result, a two-step mechanism of premelting in n-octanol was established based on exptl. data. It was postulated that it consists of a rotator state formation followed by the surface premelting. In order to shed light onto mol.-level processes, classical mol. dynamics (MD) was performed to investigate the time evolution of the changes in metric parameters as a function of simulation temperature The applied protocol enabled simulations in the solid state as well as in the liquid (the collapse of the ordered crystal structure). The exact mol. motions contributing to the rotator state formation were obtained, revealing an enabling of the rotational freedom of the terminal parts of the chains. The Car-Parrinello mol. dynamics (CPMD) was applied to support and interpret exptl. spectroscopic findings. The vibrational properties of the stretching of OH within the intermol. hydrogen bond were studied using Fourier transformation of the autocorrelation function of both dipole moments and at. velocity. Finally, path integral mol. dynamics (PIMD) was carried out to analyze the quantum effect’s influence on the bridged proton position in the hydrogen bridge. On the basis of the combined exptl. and theor. conclusions, a novel mechanism of the bridged protons dynamics has been postulated-the interlamellar hydrogen bonding pattern, resulting in an addnl. OH stretching band, visible in the solid-state exptl. IR spectra.

International Journal of Molecular Sciences published new progress about Dipole moment. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Synthetic Route of 111-87-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Xu, Wei published the artcilePhysicochemical characterization of Gleditsia triacanthos galactomannan during deposition and maturation, Synthetic Route of 59-23-4, the main research area is Gleditsia maturation galactomannan rheol physiochem; Galactomannans; Gleditsia triacanthos; M/G ratio; Molecular weight; Viscosity.

Gleditsia triacanthos polysaccharide, known as galactomannan, has not been exploited as a new functional material even though it possesses industrial potential in food and biomedicine. Galactomannans were recovered from the endosperm of seeds (15 wk to 25 wk after flowering) for deposition and maturation anal. These galactomannans were characterized by using NMR (NMR), X-ray diffraction (XRD), and monosaccharide composition anal. (particularly the mannose to galactose ratio) and mol. weight, solubility, and rheol. measurements. The ratio of the three parts in mature seeds was as follows: endosperm (36.67%), hull (34.41%), and embryo (28.92%). The M/G ratio increased from 2.53 to 3.24 between 15 and 23 wk and then decreased to 3.16 in 25 wk, consistent with the trends of rheol. and solubility The mol. weight (1.28 × 106 g/mol) and intrinsic viscosity (882.53 mL/g) reached the maximum at 23 wk and then decreased. Addnl., NMR and XRD showed that the M/G ratio did not change the basic chem. structure but caused slight changes in crystallinity. The purpose of the study was to reveal the changes in galactomannan structure, rheol., and solubility during G. triacanthos galactomannan deposition and maturation to facilitate exploration of its potential industrial applications.

International Journal of Biological Macromolecules published new progress about Embryo, plant. 59-23-4 belongs to class alcohols-buliding-blocks, name is (2R,3S,4S,5R)-2,3,4,5,6-Pentahydroxyhexanal, and the molecular formula is C6H12O6, Synthetic Route of 59-23-4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Issa-Issa, Hanan published the artcileAroma-active compounds, sensory profile, and phenolic composition of Fondilloń, HPLC of Formula: 505-10-2, the main research area is volatile grape aroma; Alicante wines; Aroma extract dilution analysis (AEDA); Gas chromatography-olfactometry (GC-O); Oxidized wines; Phenylethyl alcohol; Solvent-assisted flavor evaporation (SAFE).

The Fondilloń is a wine made from overripe grapes of the Monastrell variety, which is characterized by a high alc. content and a min. barrel ageing of 10 years. The objective of this study was to analyze the Fondilloń volatile composition, key aroma-active compounds, sensory profile and phenolic composition Fifty-four volatile compounds were identified, quantified and classified as alcs., esters, acids, aldehydes, lactones, phenols, hydrocarbons and ketone. From these compounds, 22 aroma-active compounds were identified, with phenylethyl alc., di-Et succinate and Et lactate having the highest flavor dilution factor. The Fondilloń wines were characterized by having high intensity of alc., fruity and toasted odor and flavor notes, and long aftertaste. Besides, 25 phenolic compounds were also identified and quantified; the phenolic acids (gallic, protocatechuic and syringic acids) were the predominant phenolic compounds

Food Chemistry published new progress about Food analysis. 505-10-2 belongs to class alcohols-buliding-blocks, name is 3-(Methylthio)propan-1-ol, and the molecular formula is C4H10OS, HPLC of Formula: 505-10-2.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Fang, Chuchu published the artcileComparison on characterization and biological activities of Mentha haplocalyx polysaccharides at different solvent extractions, Computed Properties of 59-23-4, the main research area is Mentha polysaccharide antioxidant physicochem property; Biological activity; Mentha haplocalyx; Physicochemical property; Polysaccharide; Solvent extraction.

This study aimed to compare the effects of four solvent extractions on the physicochem. properties, antioxidant and hypoglycemic activities of polysaccharides from Mentha haplocalyx (MHPs). The solvent extractions included hot water, citric acid (pH 3.0), 5% NaOH/0.05% NaBH4 and 0.9% NaCl. Four corresponding MHPs named as MHP-W, MHP-C, MHP-A and MHP-S were obtained, resp. The exptl. results showed that the extraction yields, basic chem. components, monosaccharide contents, mol. weights, antioxidant and hypoglycemic activities of four MHPs were significantly different. However, their thermal stabilities, preliminary structural characteristics and monosaccharide types were similar. MHP-A possessed the highest extraction yield of 9.37 ± 0.24% and the smallest mol. weight MHP-W had the highest uronic acid content and the largest mol. weight More specifically, MHP-C exhibited the highest sugar content, the most remarkable antioxidant abilities of DPPH radical scavenging activity and ferric reducing power, and the strongest inhibitory activities on α-glucosidase and α-amylase. The above results indicated that MHP-C extracted with citric acid could be served as a promising bioactive substance for applications in the functional food and medicine industries.

International Journal of Biological Macromolecules published new progress about Food analysis. 59-23-4 belongs to class alcohols-buliding-blocks, name is (2R,3S,4S,5R)-2,3,4,5,6-Pentahydroxyhexanal, and the molecular formula is C6H12O6, Computed Properties of 59-23-4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Lukic, Igor published the artcileCombined targeted and untargeted profiling of volatile aroma compounds with comprehensive two-dimensional gas chromatography for differentiation of virgin olive oils according to variety and geographical origin, Product Details of C5H12O, the main research area is volatile aroma compound virgin olive oil 2D GC; Comprehensive two-dimensional gas chromatography; Croatia; Geographical origin; Mono-dimensional; Multivariate analysis; Variety; Virgin olive oil; Volatile aroma compounds.

Comprehensive two-dimensional gas chromatog. with time-of-flight mass spectrometry (GC × GC-TOF-MS) was combined with conventional mono-dimensional GC-MS to differentiate Croatian virgin olive oils (VOO) according to variety and geog. origin, based on the profile of volatile aroma compounds isolated by HS-SPME. More than 1000 compounds were detected after untargeted profiling and 256 were identified or tentatively identified, providing one of the most detailed profiles of volatile aroma compounds in VOO up to date. Among them, 131 volatile compounds were significantly different across monovarietal VOOs, while 60 were found useful for the discrimination according to geog. origin. Many major lipoxygenase and minor non-lipoxygenase-generated compounds were shown to have discriminating ability with respect to both factors. Multivariate statistical anal. extracted twenty-one volatile markers with the highest discriminant power for varietal differentiation. The approach reported may have practical application in better understanding, defining, managing, and communicating the varietal or geog. typicity of monovarietal VOOs.

Food Chemistry published new progress about Food analysis. 584-02-1 belongs to class alcohols-buliding-blocks, name is 3-Pentanol, and the molecular formula is C5H12O, Product Details of C5H12O.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Feng, Tao published the artcileCharacterization of the key aroma compounds in three truffle varieties from China by flavoromics approach, Quality Control of 505-10-2, the main research area is Tuber aroma compound dimethyl sulfide flavoromic; Yunnan Truffle; aroma recombination; flame photometric detector (FPD); flavoromics; gas chromatography-mass spectrometry (GC-MS); gas chromatography-olfactometry (GC-O); odor-active volatiles (OAV).

The volatile compounds of three different fresh-picked truffle varieties (Tuber sinensis, T1, Tuber sinoalbidum, T2 and Tuber sinoexcavatum, T3) were extracted by headspace solid-phase microextraction (HS-SPME). Separation and identification of volatile components and sulfur compounds were investigated by gas chromatog.-olfactometry (GC-O), gas chromatog.-mass spectrometry (GC-MS) and gas chromatog. with flame photometric detection (GC-FPD). The results showed that 44, 43 and 44 volatile compounds were detected in T1, T2 and T3 samples, resp. In addition, 9, 10 and 9 sulfur compounds were identified in three samples by GC-FPD, resp. Combining physicochem. and sensory properties, T1 presented fatty, green and rotten cabbage odor; T2 exhibited mushroom, sulfuric and musty odor notes; T3 had nutty, floral and roasted potato odor. Di-Me sulfide, 3-methylbutanal, di-Me disulfide, 3-octanone, bis(methylthio) methane, octanal, 1-octen-3-one, 1-octen-3-ol and benzeneacetaldehyde played indispensable roles in the overall aroma of three truffles. Finally, based on quant. concentration in T1, odorous compounds (OAV) > 1 were mixed to recombine aroma, demonstrating that these key aroma compounds based on OAV can successfully recombine pretty similar aroma of each variety.

Molecules published new progress about Food analysis. 505-10-2 belongs to class alcohols-buliding-blocks, name is 3-(Methylthio)propan-1-ol, and the molecular formula is C4H10OS, Quality Control of 505-10-2.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Zhao, Guozhong published the artcileCharacterization of the typical fragrant compounds in traditional Chinese-type soy sauce, Recommanded Product: 3-(Methylthio)propan-1-ol, the main research area is soy sauce fragrant compound; 2-Acetyl-1-pyrroline (PubChem CID: 522834); 2-Methoxy-phenol (PubChem CID: 460); 2-Phenylethanol (PubChem CID: 6054); 5-Ethyl-4-hydroxy-2-methyl-3(2H)-furanone (PubChem CID: 93111); Aroma compounds; Ethyl phenylacetate (PubChem CID: 7590); Flavor; Fragrant compounds; Methanol (PubChem CID: 887); Phenylacetaldehyde (PubChem CID: 998); Phenylethyl acetate (PubChem CID: 7654); Sodium chloride (PubChem CID: 5234); Sodium sulfate (PubChem CID: 24436); Soy sauce.

In this work, a total of 35 important aroma compounds with odor activity values (OAVs) greater than 1 were detected by gas chromatog.-mass spectrometry (GC-MS) in traditional Chinese-type soy sauce. Of these, fragrant compounds with aromatic rings (20 compounds) accounted for a large proportion, over 57%. Combining principal component anal. and GC-olfactometry-MS (GC-O-MS), 5-methyl-2-furanmethanethiol (OAV: 284-467), 3-methylbutanal (OAV: 409-938), phenylacetaldehyde (OAV: 47.4-566), 2-phenylethanol (OAV: 7.41-14.3), phenylethyl acetate (OAV: 7.00-18.1) and Et phenylacetate (OAV: 12.7-21.3) were confirmed as the typical fragrant compounds among all samples. Furthermore, full two-dimensional gas mass spectrometry (GC × GC-TQMS) was applied and 414 aroma compounds were identified, which included another 85 fragrant compounds with aromatic rings.

Food Chemistry published new progress about Food analysis. 505-10-2 belongs to class alcohols-buliding-blocks, name is 3-(Methylthio)propan-1-ol, and the molecular formula is C4H10OS, Recommanded Product: 3-(Methylthio)propan-1-ol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Bi, Shuang published the artcileGas chromatography-mass spectrometry combined with multivariate data analysis as a tool for differentiating between processed orange juice samples on the basis of their volatile markers, Application In Synthesis of 111-87-5, the main research area is GC MS multivariate analysis orange juice volatile marker; (E)-2-Heptenal (PubChem CID 5283316); (E)-2-nonenal (PubChem CID 5283335); Carveol (PubChem CID 7438); Discriminant volatile compound; Ethyl butanoate (PubChem CID 7762); Gas chromatography–mass spectrometry; Heptanal (PubChem CID 8130); High hydrostatic pressure; Nootkatone (PubChem CID 1268142); Orange juice; Partial least-squares analysis; Pasteurization; d-Carvone (PubChem CID 16724); d-Limonene (PubChem CID 440917); p-Mentha-1,5-dien-8-ol (PubChem CID 519323); β-Terpineol (PubChem CID 8748).

The contents of volatile aroma compounds in orange juice vary after high hydrostatic pressure (HHP) processing and pasteurization, and hence gas chromatog.-mass spectrometry has potential for discriminating between orange juice samples according to the processing method. Effects of HHP processing and pasteurization on orange juice were investigated immediately after processing and after storage for 28 days at 4°C. Processing decreased the contents of most terpenes and esters and increased those of alcs. and aldehydes. Volatile compounds that could serve as discriminant indicators of HHP processing and pasteurization were heptanal, (E)-2-heptenal, (E)-2-nonenal, and d-carvone and β-terpineol, p-mentha-1,5-dien-8-ol, carveol, and β-copaene, resp. The discrimination abilities of pH, ascorbic acid, total soluble solids, and color were compared with those of volatile compounds, which were found to be lower. The compounds d-carvone and β-terpineol could be used as discriminant indicators of HHP-treated and pasteurized orange juice, resp., throughout the storage period.

Food Chemistry published new progress about Food analysis. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Application In Synthesis of 111-87-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Cipolla, Laura published the artcileGlycosyl sulfates as glycosyl donors, Quality Control of 87905-98-4, the main research area is glycosyl sulfate glycosidation; glycoside preparation glycosyl sulfate; disaccharide preparation glycosyl sulfate.

2,3,4,6-Tetra-O-benzyl-D-glucopyranose was treated with SO3.NMe3 complex to give 2,3,4,6-tetra-O-benzyl-D-glucopyranosyl sulfate trimethylamine salt (α:β = 3:1), which when reacted with various acceptors promoted by Lewis acids gave glycosides and disaccharides as α,β mixtures For example, coupling 2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl sulfate with 2,3,4,6-tetra-O-α-D-glucopyranose gave trehaloses in 96% overall yield (β,α:α,α:β,β = 8:4:3).

Tetrahedron Letters published new progress about Glycosylation. 87905-98-4 belongs to class alcohols-buliding-blocks, name is Benzyl (5-hydroxypentyl)carbamate, and the molecular formula is C13H19NO3, Quality Control of 87905-98-4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Naresh, K. published the artcilePushing the limits of automated glycan assembly: synthesis of a 50mer polymannoside, Recommanded Product: Benzyl (5-hydroxypentyl)carbamate, the main research area is oligosaccharide mannooligosaccharide preparation polysaccharide automated glycan assembly glycosylation.

Automated glycan assembly (AGA) enables rapid access to oligosaccharides. The overall length of polymers created via automated solid phase synthesis depends on very high yields at every step to obtain full length products. The synthesis of long polymers serves as the ultimate test of the efficiency and reliability of synthetic processes. A series of Man-(1→6)-α-Man linked oligosaccharides up to a 50mer, the longest synthetic sequence yet assembled from monosaccharides, has been realized via a 102 step synthesis. We identified a suitable mannose building block and applied a capping step in the final five AGA cycles to minimize (n – 1) deletion sequences that are otherwise difficult to remove by HPLC.

Chemical Communications (Cambridge, United Kingdom) published new progress about Glycosylation. 87905-98-4 belongs to class alcohols-buliding-blocks, name is Benzyl (5-hydroxypentyl)carbamate, and the molecular formula is C13H19NO3, Recommanded Product: Benzyl (5-hydroxypentyl)carbamate.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts