Author: tianli

Hui, Heping published the artcilePurification, characterization and antioxidant activities of a polysaccharide from the roots of Lilium davidii var. unicolor Cotton, Formula: C6H12O6, the main research area is Lilium root polysaccharide antioxidant; Antioxidant activity; Characterization; Lilium davidii var. unicolor Cotton; O-acetyl glucomannan; Purification.

A polysaccharide (LPR) was separated from the roots of Lilium davidii var. unicolor Cotton with hot water extraction, ethanol precipitation, and purification by anion-exchange and gel-permeation chromatog. LPR was characterized. The weight-average mol. weight (MW) of LPR was 5.12 × 104 g/moL. Glucose and mannose comprised LPR with a molar ratio of 2.9:3.3. IR, NMR and methylation anal. showed that LPR was a natural O-acetyl glucomannan, the backbone mainly contained β-(1 → 4)-linked D-glucopyranosyl and β-(1 → 4)-linked D-mannopyanosyl, and the branches probably linked at O-2 and/or O-3 of the mannosyl and glucosyl residues. The acetyl groups mainly attached at O-2 or O-3 of mannosyl residues. X-ray diffractometric (XRD) anal. and SEM (SEM) anal. revealed that LPR was a semi-crystalline substance with porous lamellar structure. Bioassays in vitro indicated that LPR had distinct scavenging activities on hydroxyl radical and DPPH radical. These findings provided a reference for functional underutilization roots of L. davidii as natural antioxidant in food and pharmaceutical industry.

International Journal of Biological Macromolecules published new progress about Lilium davidii. 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, Formula: C6H12O6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Kaneko, Kazuyoshi published the artcileDynamic and static properties of mixtures of 1-butyl-3-methylimidazolium tetrafluoroborate and alcohols with various alkyl chain lengths, Recommanded Product: n-Octanol, the main research area is butyl methylimidazolium tetrafluoroborate ionic liquid alc mixture self diffusion.

The dynamic and static properties of mixtures of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) and alcs. with various alkyl chain lengths were investigated. For alc. concentrations of 20 mol% or less, where the alc./ionic liquid system maintains a nano-heterogeneous structure, the self-diffusion coefficient and the chem. shift of anions and cations in the alc./[BMIM][BF4] system were not dependent on the alkyl chain length of the alc., but were almost coincident with each other when comparing the same solvent concentration This indicates that the solution structure of pure [BMIM][BF4] was almost maintained in the alc./ionic liquid system. Moreover, alc. having short alkyl chain length and water moved clearly faster than the IL, but the movement of alc. having long alkyl chain length moved close to that of the IL suggesting that the alcs. may not be able to move significantly in the IL.

Journal of Molecular Liquids published new progress about Hydrophobicity. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Recommanded Product: n-Octanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Lewandowska, Aneta published the artcileGel Polymer Electrolytes with Mixture of Triazolium Ionic Liquids and Propylene Carbonate, Application In Synthesis of 7575-23-7, the main research area is triazolium ionic liquid propylene carbonate gel polymer electrolyte; Kamlet–Taft parameters; gel polymer electrolytes; thiol–ene polymerization; triazolium ionic liquids.

This study is focused on the structural influence of 1,2,4-triazolium ionic liquid (IL), i.e., the effect of the length of the substituent and the type of substitution (1-methyl-4-alkyl or 1-alkyl-4-methyl) used in the mixture with propylene carbonate (PC) on the properties of thiol-ene polymer ionogels and on the preparation of an ionogel with satisfactory mech. and conductive properties. PC allows for higher conductivity but also causes electrolyte leakage from the gel. When using triazolium IL (instead of the imidazolium one), because of the stronger interactions between components of the system, the ionogels do not leak. In this study, 1,4-dialkyl-1,2,4-triazolium ILs were successfully synthesized by the alkylation of 1,2,4-triazole. Subsequently, gel polymer electrolytes were obtained by one-pot thiol-ene photopolymerization reactions of tetrafunctional thiols with different chem. structures: pentaerythritol tetra(3-mercaptopropionate) (PETMP) or pentaerythritol tetra(3-mercaptobutyrate) (PETMB) and trifunctional ene (TATT) in the presence of a mixture of 1,4-dialkyl-1,2,4-triazolium IL with PC. Measurements made by electrochem. impedance spectroscopy showed that all ionogels with TATT+PETMB as a polymer matrix presented smaller relative ionic conductivity compared to ionogels containing TATT+PETMP. The puncture resistance and elongation at puncture, measured by the puncture resistance method, were higher for ionogels with poly(TATT+PETMB) than for those with poly(TATT+PETMP). Moreover, ILs containing a Me group in position N1 of the 1,2,4-triazole ring presented lower puncture resistance than ionogels with ILs containing a Me group in position N4, especially for shorter alkyl chains. Addnl., the photo-differential scanning calorimetry method was employed to characterize the course of photopolymerization The compositions and their constituents were characterized by UV and IR spectroscopy.

Gels published new progress about Henry reaction. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Application In Synthesis of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Fu, Huijie published the artcileEffect of cadmium stress on inorganic and organic components in xylem sap of high cadmium accumulating rice line (Oryza sativa L.), SDS of cas: 97-67-6, the main research area is Oryza xylem sap cadmium stress; Cd; Inorganic anion; Organic component; Rice; Xylem sap.

Physiol. properties involved in cadmium (Cd) transport were investigated in the high Cd accumulating rice line (Lu527-8) in comparison with the normal rice line (Lu527-4) through a soil culture experiment The results showed that Cd contents in xylem saps of Lu527-8 were 1.68-2.55 times higher than those of Lu527-4 under Cd stress. A high-pos. correlation between Cd contents in xylem saps and Cd contents in shoots was observed Lu527-8 owned a more rapid and effective transport of Cd to above-ground part. By analyzing the relationship between inorganic anions, organic components and Cd contents in xylem saps, the lower HPO2-4 and oxalate contents were considered to be related to the higher Cd transport in xylem sap of Lu527-8. As for citrate, tartaric and histidine content, significant increases were observed with the increasing Cd contents in xylem saps of two rice lines, and their contents of Lu527-8 were significantly higher than those of Lu527-4. Citrate, tartaric and histidine could take part in root-to-shoot Cd transport in xylem.

Ecotoxicology and Environmental Safety published new progress about Growth (plant). 97-67-6 belongs to class alcohols-buliding-blocks, name is (S)-2-hydroxysuccinic acid, and the molecular formula is C4H6O5, SDS of cas: 97-67-6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Pan, Lei published the artcileTransition-Metal-Free Photoredox Phosphonation of Aryl C-N and C-X Bonds in Aqueous Solvent Mixtures, Application of rel-(1R,2R,4R)-1,7,7-Trimethylbicyclo[2.2.1]heptan-2-ol, the main research area is aryl halide photoredox cross coupling reaction phosphite phenothiazine catalyst; aromatic aryl phosphonate preparation green solvent.

Herein, the authors present an efficient and mild methodol. for the synthesis of aromatic phosphonate esters in good to excellent yields using 10H-phenothiazine, an inexpensive commodity chem., as a photoredox catalyst. The reaction exhibits wide functional group compatibility enabling the transformation in the presence of ketone, amide, ester, amine, and alc. moieties. Importantly, the reaction proceeds using a green solvent mixture primarily composed of H2O, thus lowering the environmental footprint of this transformation compared to current methods. The transformation also proceeds under atm. conditions, which further differentiates it from current methods that require inert atm. Mechanistic work using fluorescence quenching experiments and radical trapping approaches support the proposed mechanism.

ACS Sustainable Chemistry & Engineering published new progress about Green solvents. 124-76-5 belongs to class alcohols-buliding-blocks, name is rel-(1R,2R,4R)-1,7,7-Trimethylbicyclo[2.2.1]heptan-2-ol, and the molecular formula is C10H18O, Application of rel-(1R,2R,4R)-1,7,7-Trimethylbicyclo[2.2.1]heptan-2-ol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Koltun, Stephen J. published the artcileSensory and chemical characteristics of tomato juice from fresh market cultivars with comparison to commercial tomato juice, Recommanded Product: 3-Pentanol, the main research area is tomato juice sensory metabolites.

Florida tomatoes are primarily produced for the fresh market and have not been widely used in processed tomato products. This study tested six Florida fresh market tomato cultivars (FLA 8083, FLA 8297, FLA 8344, FLA 8570, FLA 8924 and Garden Gem) to determine suitability for juice production Genetic and environmental-induced variation was studied, and analyses identified metabolites that influenced the perceptual and hedonic responses of tomato juice. Each cultivar was processed into juice by hot breaking at 86 C for 3.5 min and then pasteurization at 121 C for 42 s for a shelf stable product. Among the six pilot products, FLA 8344 cultivar had significantly higher soluble solids content and titratable acidity in all three experiments The pH of each of the tomato juices made from fresh market tomatoes was within or below the typical range for tomato juice. Garden Gem was consistently rated significantly (P ≤ .05) higher for aroma, overall liking, tomato flavor, texture and overall flavor. In all three experiments, tomato juice from a fresh market cultivar simultaneously had the greatest abundance of green-note volatiles (hexanal, 1-hexanol, (Z)-3-hexen-1-ol, etc) and the lowest abundance of cooked-note volatiles (di-Me sulfide, methional and furfural). Consumer acceptance increased as salt concentration increased and while season had minor effects on the chem. composition of the juice, consumers preferred the Spring processed tomato juice over Fall.

Flavour and Fragrance Journal published new progress about Fruits (juice). 584-02-1 belongs to class alcohols-buliding-blocks, name is 3-Pentanol, and the molecular formula is C5H12O, Recommanded Product: 3-Pentanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Anzano, Jesus M. published the artcileChemistry practices for undergraduate students: plastic polymers characterization by gas chromatography, Safety of n-Octanol, the main research area is polymer plastic property gas chromatog.

The present study deals with the chem.-anal. characterization of plastics, specifically anal. determination of phthalates in polyvinyl chloride (PVC) and the quantification of residual styrene (S) monomer in plastic polystyrene (PS); both polymers are commonly used in food packaging. In determining phthalates, the method’s principle used, is the precipitation of the PVC polymer followed by hydrolysis of the plasticizers and the leaching of the alc. obtained in an organic phase. To study the efficiency of the reaction, dioctyl phthalate (DOP) has been used as a standard In determining S, the method used, is based on the total sample-plastic dissolution followed by the precipitation of the PS leaving behind the monomer. It does not include dilution methods. In both tests, the quant. determination is made by gas chromatog. (GC).

Journal of Laboratory Chemical Education published new progress about Food packaging. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Safety of n-Octanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Nishimura, Mitsugu published the artcileEfficient GC/MS analysis of hydroxy lipid compounds from geochemical samples using tertiary-butyldimethylsilyl etherification, Application In Synthesis of 13099-34-8, the main research area is hydroxy lipid compound analysis geochem sample GC MS; butyldimethylsilyl etherification hydroxy lipid compound analysis GC MS.

To improve GC/MS anal. of hydroxy compounds from various sources, such as alkanols, sterols, diols, keto-ols and hydroxy fatty acids (FAs) with complex compositions, the authors evaluated their column-chromatog. separation after silylation. N-tertiary-butyldimethylsilylimidazole (t-BDMS) was expected to be the most effective silylating reagent to make -OH groups more inert and hence to promote separation according to the chem. and structural differences in their individual alkyl groups. The t-BDMS etherification of hydroxy compounds remarkably improved their purification and separation by strongly constraining or enhancing the chromatog. different behavior possibly caused by chem. and structural differences in the alkyl groups. Thus, the complex mixtures of hydroxy compounds from lacustrine and marine sediments were clearly fractionated into each major compound group, i.e., alkanols, sterols, diols, hydroxy FAs and keto-ols. Also, the individual sterols, diols and hydroxy FAs were separated into four, two and five specific sub-groups, resp. It is worth noting that, by using only one column, this anal. improvement was achieved with excellent reproducibility. Such fine fractionations resulted in a substantial decrease in the complexity of the gas chromatograms of all major hydroxy compounds The improvement enabled the authors to simply and accurately identify and quantify major as well as trace homologs and isomers of various hydroxy compounds with a high level of sensitivity using GC/MS. Consequently, the authors found some series of hitherto unknown compounds to serve as information sources for organisms and environments. The chromatog. fractionation following t-BDMS etherification of lipids from various geochem. samples provides not only a greater understanding of their mol. distributions and stable carbon isotopic ratios, but also substantially upgrades lipid anal. efficiency as a whole.

Organic Geochemistry published new progress about Etherification. 13099-34-8 belongs to class alcohols-buliding-blocks, name is 17-Hydroxyheptadecanoic acid, and the molecular formula is C17H34O3, Application In Synthesis of 13099-34-8.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ribeiro, Adriana Santos published the artcileSynthesis of (R)-(-) and (S)-(+)-3-(1-pyrrolyl)propyl N-(3,5-dinitrobenzoyl)-α-phenylglycinate and derivatives. A suitable chiral polymeric phase precursor, Application of 3-(1H-Pyrrol-1-yl)propan-1-ol, the main research area is phenylglycine N dinitrobenzoyl derivative enantiomeric preparation; pyrrolylpropyl dinitrobenzoylphenylglycinate preparation precursor polymeric film.

A synthetic route to obtain 3-(1-pyrrolyl)propyl (R)- and (S)-N-(3,5-dinitrobenzoyl)-α-phenylglycinate (1, 2) and derivatives is described. In a first step, pyrrole derivatives were prepared using the Clauson-Kaas method. The esterification, second step, was performed using basic conditions due to sensitivity of the pyrrole group toward acidic conditions. A tautomeric equilibrium involving the stereogenic center induces the product epimerization. The substitution of DMAP and Et3N by a highly hindered base, proton-sponge, furnished the final products without racemization. The enantiomeric excess of 1, 2 and of the corresponding Me esters (3 and 4) were determined by 1H NMR anal. in the presence of optically active Eu(tfc)3. Epimerization was not observed in the preparation of the amine salts of (R)- and (S)-N-(3,5-dinitrobenzoyl)-α-phenylglycine with triethylamine and 1-[3-(dimethylamino)propyl]pyrrole.

Tetrahedron: Asymmetry published new progress about Esterification. 50966-69-3 belongs to class alcohols-buliding-blocks, name is 3-(1H-Pyrrol-1-yl)propan-1-ol, and the molecular formula is C7H11NO, Application of 3-(1H-Pyrrol-1-yl)propan-1-ol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Toth, Andreas published the artcileReactive Distillation for Solvent Regeneration after Biphasic Carboxylic Acid Esterification, Name: n-Octanol, the main research area is carboxylic acid esterification solvent regeneration reactive distillation.

Emulsion-enhanced biphasic esterification has proven to be applicable for carboxylic acid recovery from dilute aqueous process streams. The carboxylic acid is esterified with 1-octanol in an emulsified regime with 4-dodecylbenzenesulfonic acid (4-DBSA) or Ni(DBSA)2 as catalyst. After phase separation, the laden solvent phase must be regenerated. This study presents a regeneration concept based on reactive distillation with transesterification of the octyl ester-laden solvent with methanol. The regenerated solvent is reused in the extraction step.

Chemie Ingenieur Technik published new progress about Esterification. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Name: n-Octanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts