Author: tianli

Yuan, Biao; Han, Jiannan; Cheng, Yaolan; Cheng, Shujie; Huang, Dechun; McClements, David Julian; Cao, Chongjiang published the artcile< Identification and characterization of antioxidant and immune-stimulatory polysaccharides in flaxseed hull>, Related Products of 3458-28-4, the main research area is antioxidant polysaccharide flaxseed; Flaxseed; Immune-enhancing; MAPK; Polysaccharide.

Flaxseeds are widely consumed for their desirable sensory attributes and health benefits. We focused on enhancing the sustainability and economic potential of flaxseeds by characterizing functional attributes of polysaccharides isolated from flaxseed hull residues. In particular, antioxidant and immune-stimulatory polysaccharides were isolated and purified from flaxseed hull. IR spectroscopy was used to identify the key functional groups. The polysaccharides were composed of mannose, rhamnose, galactose, glucose, galactose, xylose, arabinose, and fucose. In vitro studies showed certain flaxseed hull polysaccharide fractions exhibited strong antioxidant activities, increased nitric oxide levels, and enhanced the production of cytokines (TNF-α and IL-6). In the presence of 200μg/mL of one of these fractions, the levels of p-ERK, p-JNK, and p-p38 increased significantly by 1.8-, 9.0-, and 6.7-fold. These polysaccharide fractions may exhibit their immune-regulatory properties partly by modulating the MAPK pathway. The flaxseed hull polysaccharides identified have potential application as natural antioxidants and immune-enhancing nutraceuticals.

Food Chemistry published new progress about Antioxidants. 3458-28-4 belongs to class alcohols-buliding-blocks, and the molecular formula is C6H12O6, Related Products of 3458-28-4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Hirai, Mitsuhiro; Ajito, Satoshi; Iwasa, Tatsuo; Wen, Durige; Igarashi, Noriyuki; Shimizu, Nobutaka published the artcile< Short-Distance Intermolecular Correlations of Mono- and Disaccharides in Condensed Solutions: Bulky Character of Trehalose>, Formula: C6H12O6, the main research area is cryptobiosis trehalose disaccharide monosaccharide condensed solution structure WAXS.

Organisms with tolerance to extreme environmental conditions (cryptobiosis) such as desiccation and freezing are known to accumulate stress proteins and/or sugars. Trehalose, a disaccharide, has received considerable attention in the context of cryptobiosis. It has already been shown to have the highest glass-transition temperature and different hydration properties from other mono- and disaccharides. In spite of the importance of understanding cryptobiosis by exptl. clarifying sugar-sugar interactions such as the clustering in concentrated sugar solutions, there is little direct exptl. evidence of sugar solution structures formed by intermol. interactions and/or correlation. Using a wide-angle X-ray scattering method with the real-space resolution from ∼3 to 120 Å, we clarified the characteristics of the structures of sugar solutions (glucose, fructose, mannose, sucrose, and trehalose), over a wide concentration range of 0.05-0.65 g/mL. At low concentrations, the second virial coefficients obtained indicated the repulsive intermol. interactions for all sugars and also the differences among them depending on the type of sugar. In spite of the presence of such repulsive force, a short-range intermol. correlation was found to appear at high concentrations for every sugar. The concentration dependence of the observed scattering data and p(r) functions clearly showed that trehalose prefers a more disordered arrangement in solution compared to other sugars, i.e., bulky arrangement. The present findings will afford a new insight into the mol. mechanism of the protective functions of the sugars relevant to cryptobiosis, particularly that of trehalose.

ACS Omega published new progress about Adaptation (cryptobiosis). 492-62-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C6H12O6, Formula: C6H12O6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Drelon, Coralie; Rogers, Michael F.; Belalcazar, Helen M.; Secombe, Julie published the artcile< The histone demethylase KDM5 controls developmental timing in Drosophila by promoting prothoracic gland endocycles>, Name: (3S,9S,10R,13R,14R,17R)-10,13-Dimethyl-17-((R)-6-methylheptan-2-yl)-2,3,4,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-ol, the main research area is Drosophila DNA KDM5 prothoracic gland embryonic development; Drosophila; Ecdysone; Endocycle; KDM5; Lid; MAPK pathway; Prothoracic gland; Torso; Transcription.

In Drosophila, the larval prothoracic gland integrates nutritional status with developmental signals to regulate growth and maturation through the secretion of the steroid hormone ecdysone. While the nutritional signals and cellular pathways that regulate prothoracic gland function are relatively well studied, the transcriptional regulators that orchestrate the activity of this tissue remain less characterized. Here, we show that lysine demethylase 5 (KDM5) is essential for prothoracic gland function. Indeed, restoring kdm5 expression only in the prothoracic gland in an otherwise kdm5 null mutant animal is sufficient to rescue both the larval developmental delay and the pupal lethality caused by loss of KDM5. Our studies show that KDM5 functions by promoting the endoreplication of prothoracic gland cells, a process that increases ploidy and is rate limiting for the expression of ecdysone biosynthetic genes. Molecularly, we show that KDM5 activates the expression of the receptor tyrosine kinase torso, which then promotes polyploidization and growth through activation of the MAPK signaling pathway. Taken together, our studies provide key insights into the biol. processes regulated by KDM5 and expand our understanding of the transcriptional regulators that coordinate animal development.

Development (Cambridge, United Kingdom) published new progress about Corpus allatum Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 434-16-2 belongs to class alcohols-buliding-blocks, and the molecular formula is C27H44O, Name: (3S,9S,10R,13R,14R,17R)-10,13-Dimethyl-17-((R)-6-methylheptan-2-yl)-2,3,4,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-ol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Yuan, Chen; Jia, Wenyan; Yu, Ziyun; Li, Yanan; Zi, Min; Yuan, Li-Ming; Cui, Yong published the artcile< Are Highly Stable Covalent Organic Frameworks the Key to Universal Chiral Stationary Phases for Liquid and Gas Chromatographic Separations?>, SDS of cas: 6290-03-5, the main research area is covalent organic framework chiral stationary phase liquid gas chromatog.

High-performance liquid chromatog. (HPLC) and gas chromatog. (GC) over chiral stationary phases (CSPs) represent the most popular and highly applicable technol. in the field of chiral separation, but there are currently no CSPs that can be used for both liquid and gas chromatog. simultaneously. We demonstrate here that two olefin-linked covalent organic frameworks (COFs) featuring chiral crown ether groups can be general CSPs for extensive separation not only in GC but also in normal-phase and reversed-phase HPLC. Both COFs have the same 2D layered porous structure but channels of different sizes and display high stability under different chem. environments including water, organic solvents, acids, and bases. Chiral crown ethers are periodically aligned within the COF channels, allowing for enantioselective recognition of guest mols. through intermol. interactions. The COF-packed HPLC and GC columns show excellent complementarity and each affords high resolution, selectivity, and durability for the separation of a wide range of racemic compounds, including amino acids, esters, lactones, amides, alcs., aldehydes, ketones, and drugs. The resolution performances are comparable to and the versatility is superior to those of the most widely used com. chiral columns, showing promises for practical applications. This work thus advances COFs with high stability as potential universal CSPs for chromatog. that are otherwise hard or impossible to produce.

Journal of the American Chemical Society published new progress about Acids Role: ARU (Analytical Role, Unclassified), ANST (Analytical Study). 6290-03-5 belongs to class alcohols-buliding-blocks, and the molecular formula is C4H10O2, SDS of cas: 6290-03-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Sahoo, Rajata Kumar; Mahato, Mamata; Jana, Achintya; Nembenna, Sharanappa published the artcile< Zinc Hydride-Catalyzed Hydrofuntionalization of Ketones>, SDS of cas: 403-41-8, the main research area is zinc guanidinate hydride catalyst hydrosilylation hydroboration ketone.

Three new dimeric bis-guanidinate zinc(II) alkyl, halide, and hydride complexes [LZnEt]2 (1), [LZnI]2 (2) and [LZnH]2 (3) (I – III, resp., R = 2,6-Et2C6H3 ) were prepared Compound 3 was successfully employed for the hydrosilylation and hydroboration of a vast number of ketones. The catalytic performance of 3 in the hydroboration of acetophenone exhibits a turnover frequency, reaching up to 5800 h-1, outperforming that of reported zinc hydride catalysts. Notably, both intra- and intermol. chemoselective hydrosilylation and hydroboration reactions have been investigated.

Journal of Organic Chemistry published new progress about Alkoxysilanes Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 403-41-8 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H9FO, SDS of cas: 403-41-8.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Lam, Albert T.; Zhang, Xiao-Nan; Courouble, Valentine V.; Strutzenberg, Timothy S.; Pei, Hua; Stiles, Bangyan L.; Louie, Stan G.; Griffin, Patrick R.; Zhang, Yong published the artcile< A Bifunctional NAD+ for Profiling Poly-ADP-Ribosylation-Dependent Interacting Proteins>, Recommanded Product: 2-(3-Methyl-3H-diazirin-3-yl)ethanol, the main research area is poly ADP ribosylation bifunctional fluorescent ligand protein interaction.

Protein poly-ADP-ribosylation (PARylation) is a heterogeneous and dynamic post-translational modification regulated by various writers, readers, and erasers. It participates in a variety of biol. events and is involved in many human diseases. Currently, tools and technologies have yet to be developed for unambiguously defining readers and erasers of individual PARylated proteins or cognate PARylated proteins for known readers and erasers. Here, we report the generation of a bifunctional NAD (NAD+) characterized by diazirine-modified adenine and clickable ribose. By serving as an excellent substrate for poly-ADP-ribose polymerase 1 (PARP1)-catalyzed PARylation, the generated bifunctional NAD+ enables photo-crosslinking and enrichment of PARylation-dependent interacting proteins for proteomic identification. This bifunctional NAD+ provides an important tool for mapping cellular interaction networks centered on protein PARylation, which are essential for elucidating the roles of PARylation-based signals or activities in physiol. and pathophysiol. processes.

ACS Chemical Biology published new progress about Apoptosis. 25055-82-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C4H8N2O, Recommanded Product: 2-(3-Methyl-3H-diazirin-3-yl)ethanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Rahman, Habibur Md.; Akter, Rokeya; Bhattacharya, Tanima; Abdel-Daim, Mohamed M.; Alkahtani, Saad; Arafah, Mohammed W.; Al-Johani, Norah S.; Alhoshani, Norah M.; Alkeraishan, Nora; Alhenaky, Alhanof; Abd-Elkader, Omar H.; El-Seedi, Hesham R.; Kaushik, Deepak; Mittal, Vineet published the artcile< Resveratrol and neuroprotection: impact and its therapeutic potential in Alzheimer's disease>, Name: (E)-5-(4-Hydroxystyryl)benzene-1,3-diol, the main research area is review resveratrol neuroprotection Alzheimer disease; Alzheimer’s disease; bioavailability; neuroprotective; oxidative stress; resveratrol; therapeutic agent.

A review. Alzheimer’s disease (AD) is a progressive cortex and hippocampal neurodegenerative disease which ultimately causes cognitively impaired decline in patients. The AD pathogen is a very complex process, including aggregation of Aβ (β-amyloid peptides), phosphorylation of tau-proteins, and chronic inflammation. Exactly, resveratrol, a polyphenol present in red wine, and many plants are indicated to show the neuroprotective effect on mechanisms mostly above. Resveratrol plays an important role in promotion of non-amyloidogenic cleavage of the amyloid precursor protein. It also enhances the clearance of amyloid beta-peptides and reduces the damage of neurons. Most exptl. research on AD and resveratrol has been performed in many species, both in vitro and in vivo, during the last few years. Nevertheless, resveratrol’s effects are restricted by its bioavailability in the reservoir. Therefore, scientists have tried to improve its efficiency by using different methods. This review focuses on recent work done on the cell and animal cultures and also focuses on the neuroprotective mol. mechanisms of resveratrol. It also discusses about the therapeutic potential onto the treatment of AD.

Frontiers in Pharmacology published new progress about Alzheimer disease. 501-36-0 belongs to class alcohols-buliding-blocks, and the molecular formula is C14H12O3, Name: (E)-5-(4-Hydroxystyryl)benzene-1,3-diol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ceborska, Magdalena; Dabrowa, Kajetan; Cedrowski, Jakub; Zimnicka, Magdalena published the artcile< Hydrogen-bonded supramolecular assemblies of folic acid with simple hexoses>, Recommanded Product: ((3aR,5R,5aS,8aS,8bR)-2,2,7,7-Tetramethyltetrahydro-3aH-bis([1,3]dioxolo)[4,5-b:4′,5′-d]pyran-5-yl)methanol, the main research area is folic acid hexose supramol structure hydrogen bond.

Simple D-hexoses such as D-glucose, D-mannose, and D-galactose were found to form supramol. complexes with folic acid (FA) in phosphate-buffered saline solution (PBS, pH 7.4) and in the gas phase. Pterin subunit of FA was found to be essential for the mol. assembly with hexoses, whereas PABA (p-aminobenzoic acid) and GLN (glutamic acid) subunits of FA have virtually no effect on assembly formation. Exptl. measurements along with DFT theor. calculations reveal that hexose-FA assemblies are stabilized by three complementary hydrogen bonds between pterin subunit of FA and 3,4,6-trihydroxyl moiety of hexose.

Journal of Molecular Structure published new progress about Formation constant. 4064-06-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C12H20O6, Recommanded Product: ((3aR,5R,5aS,8aS,8bR)-2,2,7,7-Tetramethyltetrahydro-3aH-bis([1,3]dioxolo)[4,5-b:4′,5′-d]pyran-5-yl)methanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Carroll, Timothy G.; Ryan, David E.; Erickson, Jeremy D.; Bullock, R. Morris; Tran, Ba L. published the artcile< Isolation of a Cu-H Monomer Enabled by Remote Steric Substitution of a N-Heterocyclic Carbene Ligand: Stoichiometric Insertion and Catalytic Hydroboration of Internal Alkenes>, Recommanded Product: Triphenylmethanol, the main research area is regioselective insertion copper hydride NHC monomer dimer; crystal structure mol copper hydride NHC monomer dimer preparation; catalytic hydroboration reaction copper hydride NHC monomer dimer; copper hydride NHC monomer dimer steric effect stabilization.

Transient Cu-H monomers have long been invoked in the mechanisms of substrate insertion in Cu-H catalysis. Their role from Cu-H aggregates has been mostly inferred since ligands to stabilize these monomeric intermediates for systematic studies remain limited. Within the last decade, new sterically demanding N-heterocyclic carbene (NHC) ligands have led to isolable Cu-H dimers and, in some cases, spectroscopic characterization of Cu-H monomers in solution The authors report an NHC ligand, IPr*R, containing para R groups of CHPh2 and CPh3 on the ligand periphery for the isolation of a Cu-H monomer for insertion of internal alkenes. This reactivity has not been reported for (NHC)CuH complexes despite their common application in Cu-H-catalyzed hydrofunctionalization. Changing from CHPh2 to CPh3 impacts the relative concentration of Cu-H monomers, rate of alkene insertion, and reaction of a trisubstituted internal alkene. Specifically, for R = CPh3, monomeric (IPr*CPh3)CuH was isolated and provided >95% monomer (10 mM in C6D6). In contrast, for R = CHPh2, solutions of [(IPr*CHPh2)CuH]2 are 80% dimer and 20% (IPr*CHPh2)CuH monomer at 25°C based on 1H, 13C, and 1H-13C HMBC NMR spectroscopy. Quant. 1H NMR kinetic studies on cyclopentene insertion into Cu-H complexes to form the corresponding Cu-cyclopentyl complexes demonstrate a strong dependence on the rate of insertion and concentration of the Cu-H monomer. Only (IPr*CPh3)CuH, which has a high monomer concentration, underwent regioselective insertion of a trisubstituted internal alkene, 1-methylcyclopentene, to give (IPr*CPh3)Cu(2-methylcyclopentyl), which has been crystallog. characterized. The authors also demonstrated that (IPr*CPh3)CuH catalyzes the hydroboration of cyclopentene and methylcyclopentene with pinacolborane.

Journal of the American Chemical Society published new progress about Alkenes Role: RCT (Reactant), RACT (Reactant or Reagent). 76-84-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C19H16O, Recommanded Product: Triphenylmethanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Zheng, Jianxia; Darcel, Christophe; Sortais, Jean-Baptiste published the artcile< A convenient nickel-catalysed hydrosilylation of carbonyl derivatives>, Formula: C6H9NO, the main research area is aldehyde hydrosilylation reduction polymethylhydrosiloxane nickel; primary alc preparation; ketone hydrosilylation reduction polymethylhydrosiloxane nickel; secondary alc preparation; nickel hydrosilylation reduction catalyst; polymethylhydrosiloxane reducing agent.

Hydrosilylation of aldehydes and ketones catalyzed by nickel acetate and tricyclohexylphosphine as the catalytic system was demonstrated using polymethylhydrosiloxane as a cheap reducing reagent.

Catalysis Science & Technology published new progress about Aldehydes Role: RCT (Reactant), RACT (Reactant or Reagent). 52160-51-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C6H9NO, Formula: C6H9NO.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts