To develop a simple rapid, accurate and spectrophotometric reproducible method were developed for estimation of PARA - PHENYLENE DIAMINE in different Marketed Hair dyes . The analysis PPD was performed using NaOH solution as diluent folins reagent at 432nm respectively .The methods linear the concentration range from 0-50µg/ml. validated with respect to system suitability, linearity, precision,...

This work presents the results of on determination a pollutant in model solution, antibiotic cefotaxime, using spectrophotometric method. In several series experiments, minimum concentrations cefotaxime solutions that can be detected with spectrophotometer PE-5400 UV were established; feature was revealed - increase optical density peak samples when pH is shifted to an acidic environment, espec...

The aim of the present work was the development of a novel amperometric biosensor for rapid detection of sucrose in fruit juices samples. Two enzymes, invertase and fructose dehydrogenase (FDH), were immobilized onto a single-walled carbon nanotube paste (SWCNTP) electrode by wiring with a highly original osmium-polymer hydrogel. A second biosensor, for fructose only, was constructed containing...

A turbidimetric flow-injection system was developed for the determination of sulfate in natural and residual water samples, with no previous treatment, using spectrophotometric detection. The precipitating agent, 7.0% (w/v) barium chloride solution prepared in 0.10% (w/v) polyvinyl alcohol, was added by using the merging-zones approach. A 100 mg/L sulfate solution in 0.07M nitric acid was mixed...

A redox active and electrochemiluminescent (ECL) threading bis-intercalator, consisting of two N,N'-bis(3-propyl-imidazole)-1,4,5,8-naphthalene diimides (PIND) linked by a Ru(dmbpy)2(2+) (dmbpy = 4,4'-dimethyl-2,2'-bipyridine) complex (PIND-Ru-PIND), was synthesized for the first time. Its optical, electrochemical, and ECL properties were studied. UV-vis spectrophotometric measurements indicate...

To develop a new more accurate spectrophotometric method for detecting monoamine oxidase inhibitors from plant extracts, a series of amine substrates were selected and their ability to be oxidized by monoamine oxidase was evaluated by the HPLC method and a new substrate was used to develop a peroxidase-linked spectrophotometric assay. 4-(Trifluoromethyl) benzylamine (11) was proved to be an exc...

Instrumental techniques are preferred over bioassay methods for antibiotic quantification mainly due to speed and ability quantify metabolites in biological samples; however, the potency activity of these drugs cannot be assessed. Two - agar well diffusion (bio-assay) spectrophotometric were used evaluate amikacin sulfate injection. Agar plates inoculated with S. aureus inoculum; zones inhibiti...

The development of porphyrin-embedded mesoporous organosilicate materials for application to the detection of volatile hydrocarbon solvents is described. Design of the receptor and optical indicator construct begins with parallel selection of the porphyrin indicator and design of the mesoporous sorbent. For the porphyrin indicator, high binding affinity and strong changes in spectrophotometric ...