carboxylic acid/עששת

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Coordination framework hosts consisting of 4-pyridyl-substituted carboxylic acid (PCA) dimers and 1D chains of Ni2+ and SCN-: a rational structural extension toward coordination framework hosts with large rectangular cavities.

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התחבר הרשם

For the expansion of a rectangular cavity (RC) defined by two isonicotinic acid (isoH) dimers as bridging ligands and two SCN bridges, we conducted a structural extension based on the elongation of the bridging ligands by the replacement of isoH with longer 4-pyridyl-substituted carboxylic acid

A dinuclear ruthenium catalyst with a confined cavity: selectivity in the addition of aliphatic carboxylic acids to phenylacetylene.

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התחבר הרשם

A dinuclear ruthenium catalyst with a rigid anthracene spacer shows excellent regio- and stereo-selectivity in the atom-economic addition of aliphatic carboxylic acids to phenylacetylene, producing exclusively anti-Markovnikov enol-esters with high E/Z ratios of the isomers.

A bis(triazole)benzamide receptor for the complexation of halide anions and neutral carboxylic acid guests. Guest-controlled topicity and self-assembly.

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התחבר הרשם

Bis(triazole)benzamide 1 has been readily synthesized by means of Cu-catalyzed 1,3-dipolar cycloaddition and its ability to bind halide anions and neutral gallic acid derivative 12GA has been theoretically and experimentally investigated. The cavity defined by the N-H amide group and the vicinal

An examination of the rheological and mucoadhesive properties of poly(acrylic acid) organogels designed as platforms for local drug delivery to the oral cavity.

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התחבר הרשם

This study examined the rheological/mucoadhesive properties of poly(acrylic acid) PAA organogels as platforms for drug delivery to the oral cavity. Organogels were prepared using PAA (3%, 5%, 10% w/w) dissolved in ethylene glycol (EG), propylene glycol (PG), 1,3-propylene glycol (1,3-PG),

Histamine-modified cationic beta-cyclodextrins as chiral selectors for the enantiomeric separation of hydroxy acids and carboxylic acids by capillary electrophoresis.

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התחבר הרשם

The enantiomeric separation of alpha-hydroxy acids and carboxylic acids was successfully performed by using 6-deoxy-6-N-histamino-beta-cyclodextrin (CD-hm), a monosubstituted positively charged beta-cyclodextrin (beta-CD) bearing a histamine moiety linked to the C6 of a glucose unit in the upper CD

Nanostructured alkyl carboxylic acid-based restricted access solvents: Application to the combined microextraction and cleanup of polycyclic aromatic hydrocarbons in mosses.

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התחבר הרשם

Alkyl carboxylic acid-based nanostructured solvents, synthesized in mixtures of tetrahydrofuran (THF) and water through self-assembly and coacervation, were proved to behave as restricted access liquids. Both physical and chemical mechanisms were found responsible for exclusion of macromolecules

Mutations in the central cavity and periplasmic domain affect efflux activity of the resistance-nodulation-division pump EmhB from Pseudomonas fluorescens cLP6a.

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התחבר הרשם

The EmhABC efflux system in Pseudomonas fluorescens cLP6a is homologous to the multidrug and solvent efflux systems belonging to the resistance-nodulation-division (RND) family and is responsible for polycyclic aromatic hydrocarbon transport, antibiotic resistance, and toluene efflux. To gain a

Crystallographic study of hydration of an internal cavity in engineered proteins with buried polar or ionizable groups.

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התחבר הרשם

Although internal water molecules are essential for the structure and function of many proteins, the structural and physical factors that govern internal hydration are poorly understood. We have examined the molecular determinants of internal hydration systematically, by solving the crystal

Certain carboxylic acid buffers can destabilize β-cyclodextrin complexes by competitive interaction

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התחבר הרשם

Thirteen buffers were investigated for their effect on the binding of adamantanol to β-cyclodextrin and hydroxypropyl-β-cyclodextrin. Stability constants for the β-cyclodextrin complex ranged from 14,800 to 46,000 M^-1, and the binding enthalpies were between -23.2 and -10.4 kJ/mole.

Short chain carboxylic acids decrease human gingival keratinocyte proliferation and increase apoptosis and necrosis.

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התחבר הרשם

Epithelia are key barriers to infections. In periodontal disease, the gingival sulcular epithelium becomes ulcerated. In this report, we test the hypothesis that short-chain carboxylic acids (SCCA) inhibit keratinocyte proliferation, increase necrosis and apoptosis, and may thus promote ulceration.

Complex formation of cytochrome C with a calixarene carboxylic acid derivative: a novel solubilization method for biomolecules in organic media.

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התחבר הרשם

A calixarene carboxylic acid derivative has been found to form a complex with the cationic protein cytochrome c. The solubilized cytochrome c was stable and showed peroxidase activity in chloroform. The calix[6]arene and the calix[8]arene achieved quantitative extraction of the protein. The

Synthesis and evaluation of chiral selectors with multiple hydrogen-bonding sites in the macrocyclic cavities.

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התחבר הרשם

Chiral macrocycles with the hydrogen bond donor/acceptor sites in the cavity were synthesized and covalently bonded to silica gel to give chiral stationary phases (CSPs), which showed excellent abilities to resolve various chiral compounds including ketones, esters, carboxylic acids, sulfoxides,

An extended cavitand with an introverted carboxylic acid.

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התחבר הרשם

The condensation of a Kemp's triacid derivative with a diamino resorcinarene yielded a cavitand with the deepest cavity prepared to date featuring an inwardly-directed carboxylic acid. The extended 6,7-diaminoquinoxaline wall bearing the acid allowed accommodation of large amines, such as

Inhibitory effect of carboxylic acid group on hERG binding.

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התחבר הרשם

Drug-induced QT prolongation arising from drugs' blocking of hERG channel activity presents significant challenges in drug development. Many, but not all, of our benzamidine-containing factor Xa inhibitors were found to have high hERG binding propensity. However, incorporation of a carboxylic acid

Allosteric tuning of the intra-cavity binding properties of a calix[6]arene through external binding to a ZnII center coordinated to amino side chains.

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התחבר הרשם

Molecular recognition by calix[6]arene-based receptors bearing three primary alkylamino side chain arms (1) is described. Complexation of Zn(II) ion provides the dinuclear mu-hydroxo complex 2G(OH), XRD characterization of which, together with solution studies, provided evidence of its hosting of

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