a green and convenient method for the synthesis of 14-aryl-14h-dibenzo[a,i]xanthene-8,13-diones and spiro[dibenzo[a,i]-xanthene-14,3'-indoline]-2',8,13-triones in the presence of a catalytic amount of cellulose sulfuric acid (csa) as an efficient biopolymer-based catalyst under solvent-free conditions at 100 °c is described. the condensation reactions of β-naphtol, 2-hydroxynaphthalene-1,4-dion...

The treatment of skin infections is one the most challenging conditions in these days. Clinically health professionals recommend antibiotics; however, their efficiency questionable due to side effects, as well drug delivery capabilities. This work focuses on noninvasive application Ciprofloxacin HCL (CFx)-loaded β-Cyclodextrin composite suppress antibacterial infections. Silk fibroins are used ...

in this paper, synthesized (raw) multi-walled carbon nanotube (rmwcnts) surfaces were modified with chitosan and β-cyclodextrin using chen’s soft cutting technique. raw and surface modified multi-walled carbon nanotubes were observed by transmission electron microscope (tem). the results showed that chitosan and β-cyclodextrin could attach to the outer surface of nanotubes, wrapping the nanotub...

Switchable β-cyclodextrin (β-CD)-induced hydrolysis of m-tert-butylphenyl acetate is demonstrated in the presence of supramolecular β-CD/adamantane oligonucleotide scaffolds. In one system, a duplex between a β-CD-functionalized nucleic acid and an adamantane-nucleic acid leads to a switchable catalytic system. In a second system, a β-CD/adamantane duplex is cooperatively generated by K(+)-stab...

A novel β-cyclodextrin derivative 4 bearing a pyridinio group on the primary side was synthesized by the reaction of 2-aminopyridine with 6-β-cyclodextrin monoaldehyde 3, and its complexation stability constants with several aliphatic amino acids have been determined in phosphate buffer solution ( pH = 7.2, 0.1 mol L) at 25 by using spectrofluormetric titrations. The stoichiometry is 1 1 for th...

Ephedrine and pseudoephedrine can be used as precursors for the illicit synthesis of stimulant drugs, such methamphetamine methcathinone. For this reason, an enantioselective capillary electrokinetic chromatography method was developed separation ephedrine enantiomers. After testing two different charged or chargeable cyclodextrins (β-cyclodextrin sulphate carboxymethyl-β-cyclodextrin) a few mi...

In this paper the procedure for the preparation of inclusion compounds of bioactive substance 2-[(2-aminoetoxy)-methyl]-4-(2-chlorophenyl)-1,4-dihydro-6-methyl-3,5-pyridine dicarboxylic acid 3-ethyl-5-methyl esterbenzene sulfonate, called amlodipine besylate with β-cyclodextrin (β-CD) and their structural characterization was described. Molecular inclusion compound of amlodipine besylate is obt...

Butanoic acid plays a significant role in the maintenance of mucosal health and is the preferred energy substrate for the cells in the colon. Here, butanoic acid was selectively conjugated to the secondary hydroxyl group of β -cyclodextrin through ester bond using sodium hydride as the deprotonation reagent. The preliminary release behaviors of butanoic acid in rat gastrointestinal tract conten...

The purpose of the present study was to prepare inclusion complex of domperidone with hydroxylpropyl-β-cyclodextrin in order improved the solubility and hence to increase dissolution of domperidone. An effect of concentration of hydroxylpropyl-β-cyclodextrin on the aqueous solubility of domperidone was determined by phase-solubility method. The aqueous solubility of domperidone increased as a f...

Halloysite nanotube supported ruthenium catalyst was prepared by an easy and reproducible in situ bottom up approach. Ruthenium (III) chloride reduced sodium borohydride the presence of halloysite nanotubes dispersed water. Several analyses confirm immobilization particles onto aluminosilicate support. The synthesized then tested hydrogenation 1-hexadecene, a highly hydrophobic compound, aqueou...