Tag: M.W=300-350

Banik, Soma published the artcileEffect of nano clay platelets on the hybrid monolayer of a cationic oxazine dye: In-situ Brewster Angle Microscopic (BAM) study, Category: catalysis-chemistry, the publication is Materials Today: Proceedings (2018), 5(1_Part_2), 2352-2358, database is CAplus.

The present work investigates the adsorption of a cationic oxazine dye, cresyl violate acetate (CVA), into the anionic Laponite nano clay platelets through electrostatic interaction. The adsorption resulted in the formation of Clay-CVA hybrid mols. at the air water interface. CVA tagged nano clay platelets were further adsorbed onto a cationic surfactant, Octadecylamine (ODA), matrix at the air water interface and as a consequence a stable and almost uniform ODA-Clay-CVA hybrid monolayer was formed. The organization of hybrid mols. in Langmuir trough was changed under monolayer compression resulting in the formation of different sized and shaped domain structures. Surface pressure – area per mol. (¦Ð-A) isotherm studies and in-situ Brewster angle microscopic (BAM) studies were employed in this investigation to explore the monolayer chracteristics.

Materials Today: Proceedings 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, Category: catalysis-chemistry.

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

Bhat, Rayees Ahmad published the artcileAnalysis of fatty acids and sex steroid hormones in rainbow trout testes (Oncorhynchus mykiss) during the reproductive process, Computed Properties of 6217-54-5, the publication is Aquaculture Research (2022), 53(12), 4426-4436, database is CAplus.

In the present study, we aimed to examine the cellular structure of the testes, the hormonal changes occurring throughout the reproductive cycle, and the fatty acid composition in rainbow trout. An electron microscopic anal. was conducted to investigate the morphol. and cellular changes during the development of the testes. Germ cells were observed in different stages of differentiation: primary spermatogonia (PSGs), secondary spermatogonia (SSGs), primary spermatocytes (PSCs), secondary spermatocytes (SSCs), spermatids (SPDs) and spermatozoa (SZs). Differentiated spermatozoa were observed within the cysts. Regarding steroid hormones, the maximum level of testosterone was in the mature stage, and the min. level was in the spent stage; for 11-ketotestosterone, the highest level was in the maturing stage and the lowest level was in the spent stage. In terms of the fatty acid composition, the levels of C14, C15, C16, C18, C16:1n7, C18:1n7, C18:1n9, C20:4n6, n-3 PUFAs, n-6 PUFAs, C20:5n-3 (EPA), C22:5n-3 (DPA) and C22:6n3 (DHA) (g^-1 of gonad wet weight) were the lowest during the immature stage and the highest during the mature stage of the testes. The major significance of the study is the sex steroid hormonal profile, the primary regulators of spermatogenesis and the fatty acid composition, which is important for the development of gonads and sperm. These data should contribute to the knowledge regarding the reproductive biol. of male rainbow trout, for which research data remain scarce.

Aquaculture Research 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, Computed Properties of 6217-54-5.

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

Park, Jin-Seok published the artcileExtraction of edible oils and amino acids from eel by-products using clean compressed solvents: An approach of complete valorization, Quality Control of 6217-54-5, the publication is Food Chemistry (2022), 132949, database is CAplus and MEDLINE.

Green extraction methodologies using supercritical carbon dioxide (SC-CO₂) and subcritical water were used to valorize Conger myriaster skin (CMS). The omega-3 fatty acid content in CMS oil extracted using SC-CO₂ was 18.62 ¡À 0.08%, and vitamin A, D, E, and K₂ contents were 467.38 ¡À 0.46¦Ìg/100 g, 8.31 ¡À 0.02 mg/100 g, 143.42 ¡À 4.61 mg/100 g, and 1.27 ¡À 0.05 mg/100 g, resp. De-oiled CMS was hydrolyzed using subcritical water at temperatures ranging from 160 to 280¡ãC. Total protein, total sugar, and Maillard reaction product contents reached maximum values of 409.31 ¡À 2.86 mg bovine serum albumin (BSA)/g at 190¡ãC, 8.31 ¡À 0.31 mg glucose/g at 280¡ãC, and 0.240 ¡À 0.003 (Abs_420nm) at 220¡ãC, resp. The highest antioxidant activity was observed at 280¡ãC. Free amino acids were abundant in the hydrolyzates. Oil extraction from CMS using supercritical and subcritical fluids represents an effective and economical source of functional materials.

Food Chemistry 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

Churukian, Charles J. published the artcileA simple colloidal silver method (autometallographic technique) for demonstrating inorganic mercury in brain sections, Application of 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, the publication is Journal of Histotechnology (2000), 23(4), 337-339, database is CAplus.

Standard methods for mercury measurement estimate total mercury burden in tissues but are not informative about cellular localization, for which histochem. techniques are needed. Because the main target of the toxic effects of mercury is the nervous system, it is of particular interest to localize its reservoir within the brain. This paper presents a simple, autometallog. method for demonstrating inorganic mercury in paraffin sections of brain by utilizing a buffered colloidal silver solution that contains hydroquinone. Formalin fixed, paraffin processed brain sections are cut at 7 ¦Ìm and hydrated with deionized water. The sections are placed in a buffered colloidal silver nitrate solution containing hydroquinone and kept in a 37¡ã oven for 18 to 20 min. They are then washed immediately in hot running water and rinsed in deionized water. Following treatment with 2% sodium thiosulfate for 1 min, they are rinsed in deionized water and counterstained with nuclear fast red for 3 min or with cresyl violet acetate for 5 min. After the slides are rinsed in deionized water, they are dehydrated in alc., cleared in xylene, and mounted with synthetic resin. Mercury stains black and the results are consistent and reliable.

Journal of Histotechnology 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, Application of 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate.

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

Pinfold, Harry published the artcileDetermining the Relative Structural Relevance of Halogen and Hydrogen Bonds in Self-Assembled Monolayers, Synthetic Route of 191-07-1, the publication is Journal of Physical Chemistry C (2021), 125(50), 27784-27792, database is CAplus.

Although hydrogen bonds have long been established as a highly effective intermol. interaction for controlling the formation of self-assembled monolayers, the potential utility of the closely related halogen bonds has only recently emerged. The synergistic use of both halogen and hydrogen bonds provides a unique, multitiered strategy toward controlling the morphol. of self-assembled structures. However, the interplay between these two interactions within monolayer systems has been little studied. Here, we have systematically investigated this interplay in self-assembled monolayers formed at the solid-liquid interface, with a specific attention on determining the structural relevance of the two interactions in the formation of 2D supramol. structures. A single mol. which can simultaneously act as both a halogen and hydrogen bond donor was paired with mols. which are effective acceptors for both of these interactions. The bimol. networks that result from these pairings were studied using scanning tunnelling microscopy coupled with d. function theory calculations Addnl. measurements on similar networks formed by using structural analogs in which halogen bonding interactions are no longer possible give significant insight into the structure-determining role of these interactions. We find that in some monolayer systems the halogen bonds serve no significant structure-determining role and the assembly is dominated by hydrogen bonding; however, in other systems, effective cooperation between the two interactions is observed This study gives clear insight into the synergistic and competitive balance between halogen and hydrogen bonds in self-assembled monolayers. This information is expected to be of considerable value for the future design of monolayer systems using both halogen and hydrogen bonds.

Journal of Physical Chemistry C 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, Synthetic Route of 191-07-1.

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

Taylor, M. D. published the artcileImproving the yield of 2-[¹⁸F]fluoro-2-deoxyglucose using a microwave cavity, Quality Control of 17351-62-1, the publication is Nuclear Medicine and Biology (1996), 23(5), 605-609, database is CAplus and MEDLINE.

We have investigated the use of a microwave cavity (Labwell AB, Sweden) to improve the radiochem. yield of 2-[¹⁸F]-fluoro-2-deoxyglucose (2-[¹⁸F]-FDG). After characterizing the heating properties of the cavity, three steps of the Hamacher 2-[¹⁸F]-FDG preparation which require heating-azeotropic distillation of the target water, nucleophilic substitution, and hydrolysis of the product-were investigated sep. The average radiochem. yield of 2-[¹⁸F]-FDG for the microwave preparation, using the phase transfer reagent tetrabutylammonium bicarbonate, was 62 ¡À 4% (72 ¡À 5%, decay corrected, preparation time = 31 min).

Nuclear Medicine and Biology published new progress about 17351-62-1. 17351-62-1 belongs to catalysis-chemistry, auxiliary class Salt,Amine, name is Tetrabutylammonium hydrogencarbonate, and the molecular formula is C12H16N2O2, Quality Control of 17351-62-1.

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

Tagliaferro, Marina published the artcileAssessment of metal exposure (uranium and copper) in fatty acids and carbohydrate profiles of Calamoceras marsupus larvae (Trichoptera) and Alnus glutinosa leaf litter, Category: catalysis-chemistry, the publication is Science of the Total Environment (2022), 155613, database is CAplus and MEDLINE.

Physiol. changes were explored in fatty acids (FA) and carbohydrate (CHO) composition in the shredder Calamoceras marsupus larvae (Trichoptera) and leaf litter (C. marsupus food) exposed to copper and uranium under natural and exptl. conditions. We measured FA and CHO content in leaf litter and larvae specimens from reference and impacted streams, and exposed for 5 wk to four realistic environmental concentrations of copper (35¦Ìg L-1 and 70¦Ìg L-1) and uranium (25¦Ìg L-1 and 50¦Ìg L-1). Regarding FA, (1) leaf litter had a reduced polyunsaturated FA (PUFA) content in metal treatments, s (14 to 33% of total FA), compared to natural conditions (¡Ý39% of total FA). Leaf litter exposed to uranium also differed in saturated FA (SFA) composition, with lower values in natural conditions and higher values under low uranium concentrations (2) C. marsupus had/showed low PUFA content under Cu and U exposure, particularly in high uranium concentrations Detritivores also decreased in PUFA under exposure to both metals, particularly in high uranium concentrations On the other hand, (1) microorganisms of the biofilm colonizing leaf litter differed in CHO composition between natural (impacted and reference) and exptl. conditions, with glucose and galactose being consistently the most abundant sugars, found in different amounts under copper or uranium exposure; (2) CHO of detritivores showed similar high galactose and fucose concentrations in contaminated streams and high copper treatments, whereas low copper treatment showed distinct CHO profiles, with higher mannose, glucose, arabinose, and fucose concentrations Our study provides evidence of metal exposure effects on FA and CHO contents at different trophic levels, which might alter the quality of food flow in trophic webs.

Science of the Total Environment 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 C7H5ClN2S, Category: catalysis-chemistry.

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

Souto, Jose A. published the artcileSynthetic studies on alotamide A: construction of N-demethylalotamide A, SDS of cas: 71989-31-6, the publication is European Journal of Organic Chemistry (2021), 2021(44), 6057-6070, database is CAplus.

Several approaches to the synthesis of cyclodepsipeptide natural product alotamide A are described, eventually affording a very advanced N-demethylated analog of the targeted natural product. The difficulties found in our endeavors on the synthesis of alotamide A have allowed us to gather some valuable information regarding the most convenient synthetic step for each key transformation. The intramol. Csp²-Csp² Stille cross-coupling and the macrolactam formation were found to be reliable protocols for the final construction of the alotamide A skeleton.

European Journal of Organic Chemistry published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C15H14N2, SDS of cas: 71989-31-6.

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

Posada, Laura published the artcileCyclopeptides Natural Products as Herbicides and Inhibitors of Cyanobacteria: Synthesis of Versicotides E and F, Application of Fmoc-Pro-OH, the publication is ChemistrySelect (2022), 7(27), e202201956, database is CAplus.

The first total synthesis of cyclopeptides versicotide E and F, natural products produced by marine fungus Aspergillus versicolor LZD-14-1, was achieved in good yield by solid phase peptide synthesis (SPPS) of their linear precursors and solution phase cyclization. All the versicotides A-F were evaluated as herbicides and inhibitors of cyanobacterial growth. Versicotides A, B, D, E and F showed a significant inhibition of Rye grass seed¡äs radicle growth at a concentration of 67 ¦Ìg/mL. Versicotides A, B and D also inhibited seed germination and leaf development. On the other hand, Versicotides D and F caused a relevant reduction on Microcystis aeruginosa population when cultures on exponential growth were incubated with 40 ¦Ìg/mL solutions of these compounds Evaluation of the concentration of microcystins after these treatments showed that versicotide D inhibited the production of microcystins in a comparable extent to the pos. control, colistine. These results indicate versicotides, with versicotides D and F as top hits, could be considered as lead candidates in the development of bioherbicides able to mitigate the environmental impact that the evolution of agriculture has had on water quality.

ChemistrySelect published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, Application of Fmoc-Pro-OH.

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

Korsmeyer, Julie M. published the artcileInfrared Spectroscopy and Photochemistry of Anthracoronene in Cosmic Water Ice, Application In Synthesis of 191-07-1, the publication is ACS Earth and Space Chemistry (2022), 6(1), 165-180, database is CAplus and MEDLINE.

We present a laboratory study of the polycyclic aromatic hydrocarbon (PAH) anthracoronene (AntCor, C₃₆H₁₈) in simulated interstellar ices in order to determine its possible contribution to the broad IR absorption bands in the 5-8¦Ìm wavelength interval. The Fourier transform IR (FTIR) spectrum of AntCor, codeposited with water ice, was collected. The FTIR spectrum of the sample irradiated with UV photons was also collected. Unirradiated and UV-irradiated AntCor embedded in water ice have not been studied before; therefore, the mol.’s band positions and intensities were compared to published data on AntCor in an argon matrix and theor. calculations (DFT), as well as the published results of its parent mols., coronene and anthracene, in water ice. The exptl. band strengths for unirradiated AntCor exhibit variability as a function of PAH:H₂O concentration, with two distinct groupings of band intensities. AntCor clustering occurs for all concentrations and has a significant effect on PAH degradation rates and photoproduct variability. Near-IR spectra of irradiated AntCor samples show that AntCor⁺ production increases as the concentration of AntCor in water ice decreases. Photoproduct bands are assigned to AntCor⁺, cationic alcs., protonated AntCor, and ketones. We report the rate constants of the photoproduct production for the 1:1280 AntCor:H₂O concentration CO₂ production from AntCor is much less than what was previously reported for Ant and Cor and exhibits two distinct regimes as a function of AntCor:H₂O concentration The contribution of AntCor photoproducts to astronomical spectra can be estimated by comparison with the observed intensities in the 7.4-8.0¦Ìm range.

ACS Earth and Space Chemistry 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, Application In Synthesis of 191-07-1.

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