Tag: M.W=300-350

Tran, Thi-Nguyet published the artcileDual Cross-linking of Epoxidized Linseed Oil with Combined Aliphatic/Aromatic Diacids Containing Dynamic S-S Bonds Generating Recyclable Thermosets, SDS of cas: 119-80-2, the publication is ACS Applied Bio Materials (2020), 3(11), 7550-7561, database is CAplus and MEDLINE.

The end-of-life of thermoset materials is a real issue that confronts our society, and the strategy of introducing dynamic reversible bonds can be a sustainable solution to overcome this problem. This study shows an efficient way to produce biobased and recyclable thermosets, for a circular use. To reduce the production costs linked to energy and duration, an improved curing process is proposed by combining aromatic and aliphatic diacid hardeners containing dynamic S-S bonds. The work demonstrates the increased reactivity of epoxidized vegetable oil reacted with the two diacids. The structural evolutions during the exchange reactions that allow the recyclability were followed by Fourier transformed-IR and NMR spectroscopies, high-performance liquid chromatog., and mass spectroscopy. The curing process was studied by differential scanning calorimetry and kinetic study.

ACS Applied Bio Materials published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C18H28B2O4, SDS of cas: 119-80-2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Cartoni Mancinelli, Alice published the artcileLipid metabolism analysis in liver of different chicken genotypes and impact on nutritionally relevant polyunsaturated fatty acids of meat, Quality Control of 6217-54-5, the publication is Scientific Reports (2022), 12(1), 1888, database is CAplus and MEDLINE.

Humans and mammalian species are unable to synthesize significant amounts of polyunsaturated fatty acids (PUFA), which therefore must be introduced with the diet. In birds, lipogenesis takes place primarily in the liver, whereas adipose tissue serves as the storage site for triacylglycerols TG, composed by 80-85% esterified fatty acids. However, both the nature unsaturation level, n-3, or n-6 series and the allocation such as constituents of complexed lipids of PUFA are very important to evaluate their function in lipid metabolism The objective of the present investigation was to study the liver lipid metabolism, with particular attention to non-esterified fatty acids (NEFA), TG, phospholipids (PL), FADS2 gene expression, and ¦¤6-desaturase activity of three chicken genotypes, Leghorn (Leg), Ross 308 Ross, and their crossbreed (LxR), by LC/MS anal. The concentration of single fatty acids in muscle was quantified by GC-FID. The results showed that the Ross has a lipid metabolism related mainly to storage and structural roles, exhibiting higher levels of TG, phosphatidylethanolamine (PE) and phosphatidylcholine PC that are largely unsaturated Meanwhile Leg showed a relevant amount of n-3 NEFA characterized by a higher phosphatidylserine (PS) unsaturation level, FADS2 gene expression and enzyme activity. The LxR seem to have a moderate trend: n-6 and n-3 (NEFA) showed intermediate values compared with that of the Ross and Leg and the TG trend was similar to that of the Ross, while PE and PC were largely unsaturated mainly 6 and 7 UNS most of the metabolic energy for storage fatty acids in their tissues (TG) whereas, the Leg birds were characterized by different lipid metabolism showing in their liver a higher content of n-3 NEFA and higher unsaturation level in PS. Furthers details are needed to better attribute the lipid energy to the different metabolic portion.

Scientific Reports published new progress about 6217-54-5. 6217-54-5 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Aliphatic hydrocarbon chain,Metabolic Enzyme,RAR/RXR,Natural product, name is Docosahexaenoic Acid, and the molecular formula is C22H32O2, Quality Control of 6217-54-5.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Remili, Anais published the artcileValidation of quantitative fatty acid signature analysis for estimating the diet composition of free-ranging killer whales, Recommanded Product: Docosahexaenoic Acid, the publication is Scientific Reports (2022), 12(1), 7938, database is CAplus and MEDLINE.

Accurate diet estimates are necessary to assess trophic interactions and food web dynamics in ecosystems, particularly for apex predators like cetaceans, which can regulate entire food webs. Quant. fatty acid anal. (QFASA) has been used to estimate the diets of marine predators in the last decade but has yet to be implemented on free-ranging cetaceans, from which typically only biopsy samples containing outer blubber are available, due to a lack of empirically determined calibration coefficients (CCs) that account for fatty acid (FA) metabolism Here, we develop and validate QFASA for killer whales using full blubber from managed-care and free-ranging individuals. First, we compute full, inner, and outer blubber CCs from the FA signatures across the blubber layers of managed-care killer whales and their long-term diet items. We then run cross-validating simulations on the managed-care individuals to evaluate the accuracy of diet estimates by comparing full-depth and depth-specific estimates to true diets. Finally, we apply these approaches to subsistence-harvested killer whales from Greenland to test the utility of the method for free-ranging killer whales, particularly for the outer blubber. Accurate diet estimates for the managed-care killer whales were only achieved using killer whale-specific and blubber-layer-specific CCs. Modeled diets for the Greenlandic killer whales largely consisted of seals (75.9 ¡À 4.7%) and/or fish (20.4 ¡À 2.4%), mainly mackerel, which was consistent with stomach content data and limited literature on this population. Given the remote habitats and below surface feeding of most cetaceans, this newly developed cetacean-specific QFASA method, which can be applied to outer-layer biopsies, offers promise to provide a significant new understanding of diet dynamics of free-ranging odontocetes and perhaps other cetacean species throughout the world’s oceans.

Scientific Reports published new progress about 6217-54-5. 6217-54-5 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Aliphatic hydrocarbon chain,Metabolic Enzyme,RAR/RXR,Natural product, name is Docosahexaenoic Acid, and the molecular formula is C22H32O2, Recommanded Product: Docosahexaenoic Acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Yang, Rongqiang published the artcileAssociation of fish oil containing lipid emulsions with retinopathy of prematurity: a retrospective observational study, Application of Docosahexaenoic Acid, the publication is BMC Pediatrics (2022), 22(1), 113, database is CAplus and MEDLINE.

Retinopathy of prematurity (ROP) remains a leading cause of childhood blindness worldwide. This study aimed to investigate whether supplementation of n-3 polyunsaturated fatty acids (n-3 PUFAs) in parenteral nutrition may have beneficial effects on ROP in preterm infants. A total of 89 preterm infants, admitted to Neonatal Intensive Care Unit (NICU) in Anhui Provincial Children’s Hospital from Sept. 2017 to August 2020, were recruited in the study. Based on the medical documents, the subjects were categorised into two groups: administration of the fish oil emulsion (n=43) containing soy oil, medium-chain-triglycerides (MCT), olive oil and fish oil (6g/dL, 6g/dL, 5g/dL and 3g/dL resp.), and the soy oil emulsion (n=46) containing 10g/dL of soy oil and MCT each. At 4 wk of hospitalization, ROP was screened and diagnosed. Fatty acids in erythrocytes were determined using gas chromatog. The averaged birth weight and gestational age were 1594¡À296 g and 31.9¡À2.3 wk, 1596¡À263 g and 31.6¡À2.3 wk resp. for preterm infants in the fish oil group and soy oil group. After 4 to 6 wk of hospitalization, among all the preterm infants, 52 developed ROP (all stages) indicating an incidence of ROP at 58.43%. Although the incidence of ROP with any stages showed no differences between the two groups, the severe ROP incidence in the group with fish oil emulsions (2.33%) was significantly lower than that in the group with soy oil emulsions (23.91%) (P<0.05). After 14 days of nutrition support, the preterm infants administered fish oil emulsions had an increase in erythrocyte DHA content, with a reduction in ratio of arachidonic acid (AA) to DHA and an increase of n-3 index. Supplementation of n-3 PUFAs through parenteral fish oil containing lipid emulsions resulted in an increase in erythrocyte DHA, and this might have beneficial effects on prevention of severe ROP in preterm infants.

BMC Pediatrics published new progress about 6217-54-5. 6217-54-5 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Aliphatic hydrocarbon chain,Metabolic Enzyme,RAR/RXR,Natural product, name is Docosahexaenoic Acid, and the molecular formula is C18H28N2O7, Application of Docosahexaenoic Acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Shukla, Rahul published the artcileUnderstanding Reactivity and Assembly of Dichalcogenides: Structural, Electrostatic Potential, and Topological Analyses of 3H-1,2-Benzodithiol-3-one and Selenium Analogs, Category: catalysis-chemistry, the publication is Crystal Growth & Design (2020), 20(12), 7704-7725, database is CAplus.

Mol. assembly and reactivity have been investigated with a series of 3H-1,2-benzodithiol-3-(thi)one derivatives and their (mixed) selenated analogs. Electrostatic potential calculations on monomers show three ¦Ò-hole regions around the dichalcogenide Ch-Ch bond (Ch = S, Se), one side-on and two along the bonding direction. The topol. anal. of the electron d. ¦Ñ(r) points to the weak nature of the Ch-Ch bond. ¦Ò-Hole and lone-pair regions are described in terms of charge depletion (CD) and charge concentration (CC) sites found in the valence shell of chalcogen atoms. Whereas CD and CC sites are characterized by the topol. critical points of L(r) = -?²¦Ñ(r), their electrophilic and nucleophilic powers are measured by the corresponding L/¦Ñ magnitudes. In crystal structures, each chalcogen bond (ChB) involves a ¦Ò-hole region and shows a CD¡¤¡¤¡¤CC interaction that aligns with the internuclear direction of the atoms the CD and CC sites belong. The alignment holds simultaneously for all of the ChB interactions in each crystal structure, indicating that CD¡¤¡¤¡¤CC interactions drive mol. orientation in mol. assembly. Strength of ChB is measured in terms of the topol. properties of ¦Ñ(r), whereas the intensity of the electrophilic¡¤¡¤¡¤nucleophilic interaction is monitored by [(L/¦Ñ)_CC – (L/¦Ñ)_CD]/d_{CC¡¤¡¤¡¤CD}². The ¦Ò-hole in side-on conformation forms the strongest ChB interactions in mol. assembly. Reactivity of mols. against nucleophilic attack has been investigated along each of the three ¦Ò-hole regions by using fluoride as a probe. Adducts formed along the Ch-Ch bonding direction are energetically more favorable than in side-on conformation. At optimized geometries, the F¡¤¡¤¡¤Ch bond (Ch = S, Se) exhibits a partial covalent character, while it weakens concomitantly the Ch¡¤¡¤¡¤Ch bond that also becomes of partial covalent character. In the reactivity process, the significant reorientation of the plane containing the chalcogen lone pairs, along with the opening, shrinking, and splitting of reactivity surfaces ?²¦Ñ(r) = 0, is the signature of the charge redistribution that involves the nucleophilic attack. The mol. assembly and reactivity around Ch-Ch bonds (Ch = S, Se) in dichalcogenide mols. are explored.

Crystal Growth & Design published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C15H12O6, Category: catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Chen, C. Y. published the artcileGiant Raman scattering and luminescence by molecules adsorbed on silver and gold metal island films, SDS of cas: 10510-54-0, the publication is Surface Science (1980), 101(1-3), 363-6, database is CAplus.

In order to elucidate the role played by the submicroscopic surface roughness in the enhancement of Raman scattering (RS) by mols. adsorbed on a Ag electrode, the RS was studied for mols. such as isonicotinic acid and benzoic acid adsorbed on ?50-? island films of Ag and Au. When a Ag island film is used as an overlayer on mols. that are chemisorbed on an oxide substrate, such as glass, a strongly enhanced RS is observed for isonicotinic acid, which is comparable in intensity and also similar in character to that observed for pyridine adsorbed on an electrochem. processed Ag electrode. However, no RS is observed when the Ag island film is used as the overlayer on PhCO₂H. When a Ag island film is used as a substrate for the adsorption of the mols. from solution (via chemisorption of the carboxylate group to the oxide or sulfide layer that forms when the Ag island film is exposed to air) a strong RS is observed for PhCO₂H acid as well as for isonicotinic acid. Chemisorption may play an important role in the enhancement process.

Surface Science published new progress about 10510-54-0. 10510-54-0 belongs to catalysis-chemistry, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Inhibitor,Inhibitor, name is 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, and the molecular formula is C18H15N3O3, SDS of cas: 10510-54-0.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Rabinovitch, Michel published the artcileDestruction of Leishmania mexicana amazonensis amastigotes within macrophages in culture by phenazine methosulfate and other electron carriers, Synthetic Route of 10510-54-0, the publication is Journal of Experimental Medicine (1982), 155(2), 415-31, database is CAplus and MEDLINE.

Exposure of macrophages infected with L. mexicana?amazonensis to phenazine?methosulfate (PMS) [299-11-6] resulted in rapid damage and disappearance of the intracellular amastigotes without obvious ill effects to the host cells. The reduction of the percent infection was related to the concentration of PMS and to the duration of the pulse. Most Leishmania disappeared within 2 h of a 2-h pulse with 10 ¦ÌM of the drug. In contrast, pretreatment of the macrophages with PMS followed by removal of the drug before infection did not result in disappearance of the parasites. The pH of the PMS medium markedly influenced the disappearance of Leishmania: maximum effect was observed at pH 8.0, while the effect was negligible at pH 6.3. The pH effect may be related to pseudobase formation by the PMS cation. Dose-response curves for PMS were similar for resident, elicited, or activated macrophages. Observations by time-lapse cinemicrog. documented the explosion-like fragmentation of the amastigotes within 1-2 h of exposure of infected macrophages to the drug. Parasite-derived granules and vacuoles were seen to scatter within the parasitophorous vacuoles. This early damage to the parasites was confirmed by transmission electron microscopic observations. Infected macrophages incubated with PMS displayed detectable vacuolar fluorescence, indicating that PMS or a metabolite of PMS had access to the vacuoles. A series of other electron carriers, including phenylmethanes, phenazines, oxazines, a xanthene, and a naphthoquinone, given continuously for 18 h, also induced the disappearance of the Leishmania. The most potent was crystal?violet??[548-62-9], active at 70 nM. The presence of apolar substituents enhanced activity and this is probably related to increased permeation of the dyes. Finally, PMS, as well as other electron carriers examined, also reduced the growth of Leishmania promastigotes in culture. The results are compatible with a direct effect of the drugs on the intracellular amastigotes, involving only a permissive participation of the macrophages. The diverse agents may destroy the amastigotes by redox-cycling generation of active O metabolites at or near the parasites. Alternatively, the effect of the drugs could be mediated by toxic free radical reduction species of the drugs or by interference with electron flow or with the intermediary metabolism of Leishmania.

Journal of Experimental Medicine published new progress about 10510-54-0. 10510-54-0 belongs to catalysis-chemistry, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Inhibitor,Inhibitor, name is 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, and the molecular formula is C18H15N3O3, Synthetic Route of 10510-54-0.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Santos, Joao Cesar N. published the artcileThimerosal changes protein conformation and increase the rate of fibrillation in physiological conditions: Spectroscopic studies using bovine serum albumin (BSA), SDS of cas: 119-80-2, the publication is International Journal of Biological Macromolecules (2018), 1032-1040, database is CAplus and MEDLINE.

The interaction between bovine serum albumin (BSA) and thimerosal (TM), an organomercury compound widely employed as a preservative in vaccines, was investigated simulating physiol. conditions and using different spectroscopic techniques. The results, employing mol. fluorescence showed the interaction occurs by static quenching through electrostatic forces (¦ÄH < 0 and ¦ÄS > 0), spontaneously (¦ÄG = -4.40 kJ mol^-1) and with a binding constant of 3.24 ¡Á 10³ M^-1. Three-dimensional fluorescence studies indicated that TM causes structural changes in the polypeptide chain of the BSA, confirmed by CD that showed an increase in a-helix (from 43.9 to 47.8%) content after interaction process. Through synchronized fluorescence and employing bilirubin as a protein site marker, it was confirmed the preferential interaction of TM in the subdomain IB of BSA. The interaction mechanism proposed in this work is based on the reaction of TM with BSA through of free Cys34 residue, forming the adduct BSA-HgEt with the thiosalicylic acid release, which possibly interacts electrostatically with pos. side chain amino acids of the modified protein. Finally, it was proven that both TM and EtHgCl accelerate the protein fibrillation kinetics in 42 and 122%, resp., indicating the toxicity of these compounds in biol. systems.

International Journal of Biological Macromolecules published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, SDS of cas: 119-80-2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Nakagawa, Takeshi published the artcilePiezochromic luminescence of dicoronylene: Key for revealing hidden Raman modes at high pressure, HPLC of Formula: 191-07-1, the publication is Carbon (2022), 563-569, database is CAplus.

Mol. crystals of dicoronylene (C₄₈H₂₀), a member of very large polycyclic aromatic hydrocarbons (PAHs), exhibits strong red fluorescence under ambient conditions. This strong fluorescence induced by visible light excitation obscures entire Raman spectrum of dicoronylene. The authors employed in-situ high-pressure luminescence spectroscopy to observe a reversible piezochromic effect, in which the fluorescence exhibits a drastic red shift with a rapid quenching of intensity. At >4 GPa, under red shifted and reduced fluorescence, hidden Raman modes are observed with 532 nm green laser at ¡Ü20 GPa. The application of pressure can finely tune the fluorescence of dicoronylene, allowing the observation of the Raman spectrum with an appropriate laser wavelength and dicoronylene has high chem. stability among PAH mols. with multiple aromatic rings.

Carbon published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C24H12, HPLC of Formula: 191-07-1.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Zlatkovic, Dragan published the artcileA novel pathway for the thermolysis of N-nitrosoanthranilates using flash vacuum pyrolysis leading to 7-aminophthalides, SDS of cas: 119-80-2, the publication is Organic & Biomolecular Chemistry (2020), 18(41), 8371-8375, database is CAplus and MEDLINE.

Flash vacuum pyrolysis of Me N-methyl-N-nitrosoanthranilate leads to elimination of nitric oxide and disproportionation of the formed N-radical to 7-(methylamino)phthalide and Me N-methylanthranilate. This transformation is a convenient, solvent-free method for the preparation of 7-(methylamino)phthalides. An alternative route through pyrolysis of N-benzyl-N-Me anthranilates was also studied.

Organic & Biomolecular Chemistry published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C8H14O4, SDS of cas: 119-80-2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia