The mixed dissociation constant of azathioprine—chemically 6-(3-methyl-5-nitroimidazol-4-yl)sulfanyl-7Hpurine at various ionic strengths I of range 0.01-0.2, and at temperatures of 25°C and 37°C, was determined with the use of two different multiwavelength and multivariate treatments of spectral data, SPECFIT32 and SQUAD(84) nonlinear regression analyses and INDICES factor analysis according to...

in this study at first , an azo dye, 2,7- naphthalenediol, 2-[(4-bromophenyl)azo (bpand) as a ligand has been synthesized by addition of p-bromoaniline to the modified montomorillonite k10 clay. this ligand was characterized using 1h-nmr, uv-vis and ir spectroscopies. subsequently, its interaction with calf thymus deoxyribonucleicacid ,ct-dna was investigated in 5 mm phosphate buffer solution, ...

The experimental determination of formation constant for interaction of two water soluble phthalocyanines,Cobalt (II) 4,4',4",4'"-tetrasulpho phthalocyanine (CoTsPc ) and Manganese(II) 4,4',4",4"-tetrasulphophthalocyanine (MnTsPc ) , with calf thymus DNA have been studied by UV-Vis spectrophotometric methodat lrnM phosphate buffer , pH 7.4 and at 5 different temperatures 20,25,30,35 and 400CC ....

two rapid, simple, sensitive and cost-effective titrimetric and spectr-ophotometric methods are described for the determination of albendazole (alb) in bulk drug and in pharmaceuticals. in titrimetry (method a), alb is oxidized by a known excess of potassium permanganate (kmno 4 ) in h 2 so 4 medium followed by the determination of unreacted permanganate by titration with ferrous ammonium sulph...

The recycling of heavy metal contaminants from wastewater as a source valuable products perfectly fits with the principles Circular Economy system in view restoring pollutants back into endowed new social and economic benefits. Heavy metals are often present such low concentration that it makes removal efficiency difficult to realize through conventional physicochemical methods high selectivity...

The present work deals with the preparation of chemically and enzymatically eugenol-modified chitosan its application as a green coating on viscose for potential production medical textiles. elemental composition was determined by attenuated total reflection Fourier transform infrared (ATR FT-IR) proton nuclear magnetic resonance ( 1 H NMR) spectroscopy. Moreover, potentiometric titration used ...

The biguanide concentration of polyhexamethylene biguanide hydrochloride (PHMB-HCl) was measured by non-aqueous titration with HClO4, argentometric titration, the Kjeldhal method, and colloidal titration. The summation value of non-aqueous titration and argentometric titration corresponded to two titrable nitrogens in five nitrogens per one unit of PHMB-HCl, and consisted with the result of the...

Reversed-phase HPLC and UV spectrophotometric techniques using water as solvent have been developed and validated for the simultaneous determination of amoxicillin and cloxacillin in capsules. For both techniques, the linearity range of 60.073x2013;140.0 µg/mL was studied. The spectrophotometric data show that non-derivative techniques, such as absorbance ratio and compensation, and ratio spect...