Month: October 2022

Lafontaine, Scott; Varnum, Scott; Roland, Aurelie; Delpech, Stephane; Dagan, Laurent; Vollmer, Daniel; Kishimoto, Toru; Shellhammer, Thomas published the artcile< Impact of harvest maturity on the aroma characteristics and chemistry of Cascade hops used for dry-hopping>, Product Details of C10H18O, the main research area is hop oil ripening beer aroma thiol; 3-Mercaptohexanol (PubChem CID: 521348); 3-Mercaptohexylacetate (PubChem CID: 17774879); 4-Methyl-4-mercaptopentan-2-one (PubChem CID: 88290); Beer; Dry-hopping; Geraniol (PubChem CID: 637566); Harvest maturity; Hop quality; Humulone (PubChem CID: 442911); Humulus lupulus; Linalool (PubChem CID: 6549); Polyfunctional thiols; Sensory; β-Myrcene (PubChem CID: 31253).

The impact of ripening on the dry-hop aroma potential and chem. development of Cascade hops is not well understood. Therefore, 5-6 weekly hop samples were collected over the 2014, 2015 and 2016 harvests. Concentrations of humulones did not change as a function of harvest date, while total hop essential oil content displayed significant pos. trends. Concentrations of thiol precursors decreased over harvest while concentrations of free thiols increased. These weekly samples were used to dry-hop an unhopped base beer. Overall hop aroma intensity and citrus quality attributed to beer during dry-hopping increased as a function of harvest date. These results suggest that for brewers to maximize the efficiency of hop usage, early harvested Cascades might be better for bittering, while, later harvested Cascades might be better for dry-hopping or aroma additions because they attributed more intense citrus aromas to beer and had higher concentrations of free thiols and terpene alcs.

Food Chemistry published new progress about Beer. 78-70-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C10H18O, Product Details of C10H18O.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Han, Qiao-Hong; Liu, Wen; Li, Hong-Yi; He, Jing-Liu; Guo, Huan; Lin, Shang; Zhao, Li; Chen, Hong; Liu, Yao-Wen; Wu, Ding-Tao; Li, Shu-Qing; Qin, Wen published the artcile< Extraction optimization, physicochemical characteristics, and antioxidant activities of polysaccharides from kiwifruit (Actinidia chinensis Planch.)>, Category: alcohols-buliding-blocks, the main research area is Actinidia polysaccharide antioxidant physicochem property; Actinidia chinensis Planch.; antioxidant activity; chemical structure; microwave-assisted extraction; polysaccharide; ultrasonic-assisted extraction.

In order to evaluate effects of extraction techniques on the physicochem. characteristics and antioxidant activities of kiwifruit polysaccharides (KPS), and further explore KPS as functional food ingredients, both microwave-assisted extraction (MAE) and ultrasonic-assisted extraction (UAE) were optimized for the extraction of KPS. Furthermore, the physicochem. structures and antioxidant activities of KPS extracted by different techniques were investigated. The optimal extraction conditions of UAE and MAE for the extraction of KPS were obtained by response surface methodol. Different extraction techniques significantly affected the contents of uronic acids, mol. weights, molar ratios of constituent monosaccharides, and the degree of esterification of KPS. Results showed that KPS exhibited remarkable DPPH and ABTS radical scavenging activities, and reducing power. The high antioxidant activities observed in KPS extracted by the MAE method (KPS-M) might be partially attributed to its low mol. weight and high content of unmethylated galacturonic acid. Results suggested that the MAE method could be a good potential technique for the extraction of KPS with high antioxidant activity, and KPS could be further explored as functional food ingredients.

Molecules published new progress about Actinidia chinensis. 3458-28-4 belongs to class alcohols-buliding-blocks, and the molecular formula is C6H12O6, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Plestina, R.; Stoner, H. B.; Jones, Glenys; Butler, W. H.; Mattocks, A. R. published the artcile< Vascular changes in the lungs of rats after the intravenous injection of pyrrole carbamates>, Application of C6H9NO, the main research area is lung pathol pyrrole carbamate; monocrotaline derivative lung toxicity; alkaloid pyrrolizidine derivative lung.

Acute pulmonary edema was produced in mice and rats, after injection into a systemic vein, of 1-methyl-2-(N-ethylcarbamoyloxymethyl)pyrrole (I) [62435-67-0] and 1-methyl-2,3-bis(N-ethylcarbamoyloxymethyl)pyrrole (II) [36504-91-3], 2 synthetic compounds related to monocrotaline pyrrole. 1-Methyl-2-hydroxymethylpyrrole (III) [52160-51-7] and Et N-ethylcarbamate [623-78-9] had no such effect and although 3-(N-ethylcarbamoyloxymethyl)furan (IV) [50884-33-8] did not cause pleural effusion in rats it did in mice. Like monocrotaline pyrrole, the pyrrole carbamates, when injected into other vessels, produced edema in the region of the 1st capillary bed encountered. S labeling occurred in both the postcapillary venules and the capillaries of the lungs when colloidal C was injected i.v. after the pyrrole carbamates. Venular labeling occurred before capillary labeling, which occurred optimally when C was injected >4 h after the pyrrole. No C labeling was observed after IV injection. The effects of the synthetic pyrrole esters were similar to those of monocrotaline pyrrole. The pyrrole carbamates were less active on a mol. basis, but they had a broader action on the pulmonary vasculature, causing both venular and capillary labeling. The compounds required the pyrrole ring structure and ≥1 ester side-chain to affect the lungs acutely.

Journal of Pathology published new progress about Lung. 52160-51-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C6H9NO, Application of C6H9NO.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Bharate, Sandip B.; Singh, Inder Pal published the artcile< A two-step biomimetic synthesis of antimalarial robustadials A and B>, HPLC of Formula: 4396-13-8, the main research area is phloroglucinol Vilsmeier Haak formylation; diformylphloroglucinol preparation isobutanal pinene Knoevenagel condensation Diels Alder cycloaddition; robustadial A B asym synthesis.

The antimalarial robustadials A and B have been synthesized in two steps starting from com. available phloroglucinol comprising a key biomimetic three-component reaction that involves in situ generation of an o-quinone methide via Knoevenagel condensation and subsequent Diels-Alder cycloaddition with (-)-β-pinene.

Tetrahedron Letters published new progress about Biomimetic synthesis. 4396-13-8 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H6O5, HPLC of Formula: 4396-13-8.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Maier, Thomas M.; Gawron, Martin; Coburger, Peter; Bodensteiner, Michael; Wolf, Robert; van Leest, Nicolaas P.; de Bruin, Bas; Demeshko, Serhiy; Meyer, Franc published the artcile< Low-Valence Anionic α-Diimine Iron Complexes: Synthesis, Characterization, and Catalytic Hydroboration Studies>, Synthetic Route of 403-41-8, the main research area is iron diimine low valent complex preparation ketone hydroboration catalyst; crystal mol structure iron diimine low valent ferrate complex.

The synthesis of rare anionic heteroleptic and homoleptic α-diimine iron complexes is described. Heteroleptic BIAN complexes [(cod)Fe(BIAN)][K([18]c-6)(thf)0.5] (1) and [(dnbe)Fe(BIAN)][K([18]c-6)(thf)2] (2; H2BIAN = N,N’-Dipp2-1,2-acenaphtylenediamine, cod = 1,5-cyclooctadiene, dnbe = 5,5′-dinorbornene-6,6′-diyl)were synthesized by reduction of the [(BIAN)FeBr2] precursor complex using stoichiometric amounts of potassium graphite in the presence of the corresponding olefin. The electronic structure of these paramagnetic species was investigated by numerous spectroscopic analyses (NMR, EPR, 57Fe Mossbauer, UV-vis), magnetic measurements (Evans NMR method, SQUID), and theor. techniques (DFT, CASSCF). Whereas anion 1 is a low-spin complex, anion 2 consists of an intermediate-spin Fe(III) center. Both complexes are efficient precatalysts for the hydroboration of carbonyl compounds under mild reaction conditions. The reaction of bis(anthracene) ferrate(1-) gave the homoleptic BIAN complex 3-[K([18]c-6)(thf)], which is less catalytically active. The electronic structure was elucidated with the same techniques as described for complexes 1-[K([18]c-6)(thf)0.5] and 2-[K([18]c-6)(thf)2] and revealed an Fe(II) species in a quartet ground state. Highly reduced ferrate anions were synthesized and structurally characterized. The mol. structures were elucidated by X-ray crystallog. Because of the presence of redox-active α-diimine ligands, the electronic situation was thoroughly analyzed using high-level quantum chem. calculations 57Fe-Mossbauer, EPR, NMR, and UV-vis spectroscopies and SQUID magnetization measurements were employed to characterize the spectroscopic and magnetic properties. Two of the new complexes prepared are precatalysts for the hydroboration of carbonyl compounds requiring low catalyst loadings.

Inorganic Chemistry published new progress about Crystal structure. 403-41-8 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H9FO, Synthetic Route of 403-41-8.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts