A selective and sensitive high-performance liquid chromatographic method with chemiluminescence detection for the determination of 5-hydroxyindoles is described, based on the reaction of 5-hydroxyindoles with 4-dimethylaminobenzylamine. Serotonin, 5-hydroxyindole-3-acetic acid, 5-hydroxytryptoph...

1.1. We have confirmed the observation that incubation of 17β-hydroxyestr-4-en-3-one 1a with Botrodiplodia malorum yields almost exclusively the corresponding 1β-hydroxy compound.2.2. However, when estr-4-ene-3,17-dione 1b was incubated under the same conditions we found that the major product...

In this study we show a facile method to synthesize nanocomposites of PPY and silver from the direct oxidation of pyrrole by silver cations from silver bis(trifluoromethanesulfonyl)imide (AgTf2N), using 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMImTf2N) as solvent and templ...

The effect of silver nitrate concentration, pre-washed bentonite (to remove extraneous salt) and back-exchange procedures have been explored to assess the type of silver species formed and their behaviour upon exposure to further salts. X-ray fluorescence was used to quantify the amount of silve...

The catalysing effect of Ag+ or Ag nanoparticle (AgNp) on chalcopyrite (bio)leaching at 30 °C was studied in this paper, and the change of Ag speciation was investigated by Ag K-edge X-ray Absorption Near-edge Spectroscopy (XANES). The solution studies indicate that the addition of 0.2% Ag (fra...

This article reports formulation of remarkably stable macromolecule capped silver nanoparticles for the instant naked eye assay of extremely hazardous environmental pollutant, picric acid. We have established a simple and sensitive colorimetric technique for the assay of picric acid using spheri...

Gelatin was obtained from the Nile tilapia skin and used to prepare and stabilize silver nanoparticles (AgNPs) at a pH of 11.0. The properties gelatin-AgNP and gelatin-AgNP films with tannic acid (TA) were evaluated. TA is a non-toxic cross-linker agent and was add to enhance the mechanical prop...

A new simple fluorometric aptasensor was developed for the determination of adenosine (AD) in human urine samples. A mixture of new and green nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs) as fluorescents and silver nanoparticles (AgNPs) as quenchers were utilized for aptasensing. T...

Bare silver nanoparticles were employed as a chemical sensor for selective detection of diazinon pesticide in fruit and vegetable samples. The sensing mechanism for detection of diazinon is based on the color change of AgNPs from yellow to pinkish-red followed by the red shift of LSPR absorption...

A renewable and recyclable adsorbent was synthesized by introducing thiol (CSH), episulfide (CSC ring) and thion (CS) groups onto the surface of corn stalks with epithiochlorohydrine as a crosslinker (OCS-ET-TU). The adsorption capacity of OCS-ET-TU for [AgCl4]3− reached to 79.94 mg∙g−1 at the a...

This research work was carried out with the objective of understanding the reaction kinetics involving different catalysts like SrTiO3 (STO), sulfur doped SrTiO3 (S-STO), Ag metalized SrTiO3 (Ag-STO) and Ag metalized sulfur doped SrTiO3 (Ag-S-STO) which possess unique surface and bulk characteri...

Ammonia borane (NH3BH3), as a source material for energy generation and hydrogen storage, has attracted growing interest due to its high hydrogen content. We have investigated the synthesis of ammonia borane from diborane (B2H6) and ammonia (NH3) utilizing a low-temperature process. From our res...

We report calculated total ionization cross sections of diborane molecules (B2H4 and B2H6) from threshold to ∼2 keV by two methods viz., Complex Scattering Potential-ionization contribution (CSP-ic) and Binary Encounter Bethe (BEB) formulations. In the CSP-ic method, total ionization cross sect...

An EPR study has been carried out to investigate the structure and behaviour of the free radical formed γ-irradiated l-alaninamide hydrochloride, dl-glutamic acid monohydrate and N-(2-carboxyethyl) iminodiacetic acid powders at room temperature. The observed paramagnetic species have been attri...

Chiral separation of racemic mixtures is essential in the production of many pharmaceutical compounds. The present work describes a novel chiral separation technique that combines cooling crystallization and a membrane separation that is used in DL-glutamic acid resolution. The process utilizes ...

Inhibition of angiogenesis is one of the most promising approaches in anticancer therapy. It was recently suggested that Neuropilin-1 (NRP-1) in tumour cells may serve as a separate receptor for Vascular Endothelial Growth Factor-165 (VEGF165) which is one of the main pro-angiogenic agents in th...

The synthesis of α,α-diphenyl-4-trans-hydroxy-(L)-prolinol modified with imidazolium based ionic liquids was carried out with trans-α,α-diphenyl-4-hydroxy-(L)-prolinol, 5-bromovaleric acid or 1,5-dibromopentane and imidazole. α,α-Diphenyl-4-hydroxy-(L)-prolinol modified with imidazolium io...

Substituted diphenyl sulfones (10a–n) were synthesised, and the structures were confirmed by NMR, LC–MS and X-ray crystallography. Their antagonistic activities towards 5-HT6 receptor were assessed in a cell-based functional assay. Diphenyl sulfone 10a, in spite of being the smallest and simpl...

A simple, stereoselective and efficient method for the hydrothiolation of terminal alkynes with diaryl disulfides and diphenyl diselenide has been developed. In the presence of CuI, rongalite, and Cs2CO3, a variety of disulfides underwent the reaction of terminal alkynes stereoselectively to aff...

In this study, diphenyl sulfide (Ph2S) was employed to prepare a series of Ph2S-modified Pd/C catalysts (Pd–Ph2S/C). Catalyst characterization carried out by Brunner–Emmet–Teller (BET), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and C...