benzophenone/dental caries

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Antinociceptive and anti-inflammatory properties of 7-epiclusianone, a prenylated benzophenone from Garcinia brasiliensis.

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7-Epiclusianone, a natural prenylated benzophenone, was extracted from Garcinia brasiliensis Planch. & Triana (Clusiaceae), a native plant commonly known as bacupari and used in traditional Brazilian medicine for the treatment of inflammatory diseases. As a result of the wide spectrum of biological

A single amino acid substitution converts benzophenone synthase into phenylpyrone synthase.

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Benzophenone metabolism provides a number of plant natural products with fascinating chemical structures and intriguing pharmacological activities. Formation of the carbon skeleton of benzophenone derivatives from benzoyl-CoA and three molecules of malonyl-CoA is catalyzed by benzophenone synthase

Benzophenone synthase and chalcone synthase from Hypericum androsaemum cell cultures: cDNA cloning, functional expression, and site-directed mutagenesis of two polyketide synthases.

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Benzophenone derivatives, such as polyprenylated benzoylphloroglucinols and xanthones, are biologically active secondary metabolites. The formation of their C13 skeleton is catalyzed by benzophenone synthase (BPS; EC 2.3.1.151) that has been cloned from cell cultures of Hypericum androsaemum. BPS is

Biosynthesis of biphenyls and benzophenones--evolution of benzoic acid-specific type III polyketide synthases in plants.

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Type III polyketide synthases (PKSs) generate a diverse array of secondary metabolites by varying the starter substrate, the number of condensation reactions, and the mechanism of ring closure. Among the starter substrates used, benzoyl-CoA is a rare starter molecule. Biphenyl synthase (BIS) and

Cyclodextrin and polysaccharide-based nanogels: entrapment of two hydrophobic molecules, benzophenone and tamoxifen.

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The entrapment of two hydrophobic molecules, benzophenone and tamoxifen, into self-assembling cyclodextrin (CD)-based nanogels has been studied. These nanogels formed spontaneously upon the association of a hydrophobically modified dextran (MD) and a cyclodextrin polymer (pbetaCD). The interactions

Three-fold interpenetrating three-dimensional networks based on C-methylcalix[4]resorcinarene incorporating benzophenone guest molecules.

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A new solid based on C-methylcalix[4]resorcinarene and the linker molecule bis(4-pyridylmethylidyne)hydrazine (bpmh) has been prepared, in which brick-wall sheets are linked in the third dimension to give networks with three intersecting perpendicular channels; the networks interpenetrate

Biomimetic catalysis with immobilised organometallic ruthenium complexes: substrate- and regioselective transfer hydrogenation of ketones.

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Chloro-(eta6-arene) complexes of ruthenium(II) with N-sulfonyl-1,2-ethylenediamine ligands that have one or two styrene side chains have been synthesised and characterised. The chloro ligand was substituted with a diphenylphosphinato ligand and the resulting organometallic complexes are transition

Medicinal chemistry and chemical biology of diketopiperazine-type antimicrotubule and vascular-disrupting agents.

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Certain antimicrotubule agents displaying colchicine-like tubulin-depolymerizing activity can act as both cytotoxic and vascular-disrupting agents (VDAs). VDAs constitute a new class of anticancer drugs and are currently in clinical trials. We have developed a VDA clinical candidate (phase II)

A promiscuous CoA ligase provides benzoyl-CoA for xanthone biosynthesis in Hypericum

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Benzoic acid-derived compounds, such as polyprenylated benzophenones and xanthones, attract the interest of scientists due to challenging chemical structures and diverse biological activities. The genus Hypericum is of high medicinal value, as exemplified by H. perforatum. It is rich in benzophenone

Engineered biosynthesis of plant polyketides: structure-based and precursor-directed approach.

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Pentaketide chromone synthase (PCS) and octaketide synthase (OKS) are novel plant-specific type III polyketide synthases (PKSs) obtained from Aloe arborescens. Recombinant PCS expressed in Escherichia coli catalyzes iterative condensations of five molecules of malonyl-CoA to produce a pentaketide

Synthesis of bridged molecular gyroscopes with closed topologies: triple one-pot macrocyclization.

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We describe the synthesis and characterization of six bridged molecular gyroscopes with m-alkoxy-substituted trityl stators and dialkynylphenylene rotators. All of the bridged molecular gyroscopes were synthesized convergently to form the phenolic stator-rotator framework, while the alkyl and

The influence of denture cleansers on the release of organic compounds from soft lining materials.

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Biocompatibility constitutes the most fundamental requirement with respect to all dental materials to be applied within the oral cavity. In its environment, various toxic compounds may be released by dental materials which pose potential threats to the patient's health. Due to the fact that dentures

Luminescence lifetime distributions analysis in heterogeneous systems by the use of Excel's Solver.

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A detailed study of the luminescence decay curves of pyrene included within p-tert-butylcalix[4]arene cavities and benzophenone into silicalite channels is reported. A new methodology for a lifetime distribution analysis of the decay curve of probes onto heterogeneous surfaces is presented, which

Spontaneous association of hydrophobized dextran and poly-beta-cyclodextrin into nanoassemblies. Formation and interaction with a hydrophobic drug.

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New nanoassemblies were instantaneously prepared by mixing two aqueous solutions, one containing a beta-cyclodextrin polymer (pbetaCD), and the other a hydrophobically modified by alkyl chains dextran (MD). The formation mechanism and the inner structure of these nanoassemblies were analysed using

PLA nanoparticles coated with a β-cyclodextrin polymer shell: preparation, characterization and release kinetics of a hydrophobic compound.

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The aim of this work was to incorporate a hydrophobic compound benzophenone (BP) into core-shell nanoparticles (NPs) and to study its release. The core of these NPs is based on polylactic acid (PLA) and serves as a nanocontainer to accommodate BP. The shell is constituted of a β-cyclodextrin polymer

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