Journal of Chemistry

https://www.hindawi.com/journals/jchem/

List of Papers (Total 13,838)

Synthesis, Characterization and Antimicrobial Activity of 5-(4-Methyl piperazinyl methylene)-8-hydroxy quinoline and its Various Metal Chelates

5-Chloromethyl-8-quinolinol was condensed with 4-methyl piperazine in presence of sodium bicarbonate. The resulting 5-(4-methyl piper-azinylmethylene)-8-quinolinol (MPQ) was characterized by elemental analysis and spectral studies. The transition metal chelates viz Cu

Preparation and Antimicrobial Screeningof Cu (II), Ni (II), Zn (II) Cd (II) Complexes

The metal complexes of Ni(II), Cu(II), Zn(II) Cd(II) with organic ligands viz Hydrazine hydrate, 1,2-N,N'-Bisammonium thiocarbamoyl ethane and 1,4-N,N'-Bisammonium thiocarbamoyl benzene have been prepared. These ligands and metal complexes of dithiocarbamates were screened for their antimicrobial activity against various microbs.

Simultaneous Estimation of Domperidone and Pantoprazole in Solid Dosage Form by UV Spectrophotometry

Domperidone is an antiemetic and pantoprazole is an antiulcer drug. Simple, precise, rapid and selective simultaneous equation and Q- analysis UV spectrophotometric methods have been developed for the simultaneous determination of domperidone and pantoprazole from combined tablet dosage forms. The methods involve solving of simultaneous equations and Q-value analysis based on...

Solvent-free Synthesis of Nitriles from Aldehydes Catalyzed by KF/Al2O3, Montmorillonite KSF and K10

Multistep and one-pot conversion of aldehydes to nitriles were carried out conveniently with out solvent using KF/Al2O3, montmorillonite KSF and K10 as catalyst, under microwave irradiation. The reactions are completed within 6-8 min to give satisfactory yields. KF/Al2O3 was more effective catalyst both in multistep procedure and one-pot reaction.

Simple Spectrophotometric Methods for the Determination of Zidovudine in Pharmaceuticals Using Chloramine-T, Methylene Blue and Rhodamine-B as Reagents

Two new spectrophotometric methods are proposed for the determination of zidovudine(ZDV) in pharmaceuticals. The methods use chloramine-T (CAT) and two dyes, methylene blue and rhodamine-B, as reagents and are based on adding of a known excess of CAT to ZDV in hydrochloric acid medium followed by determination of residual oxidant by reacting with a fixed amount of either...

Polypyrrole Conducting Electroactive Polymers: Synthesis and Stability Studies

This paper deals with a fundamental review of preparation methods, characterizations, thermal and environmental stabilities and practical applications of polypyrrole (PPy) conducting electroactive polymers. In this article some of the most important factors affecting the electrical, electrochemical, thermal and environmental stabilities of polypyrrole conducting polymers have...

Synthesis and Antimicrobial Activity of Some Novel Chalcones of 2-Hydroxy -1-Acetonapthone and 3-Acetyl Coumarin

Five novel chalcones were synthesised by condensing 2-hydroxy-1-acetonaphthone with aldehyde derivatives in dilute ethanolic potassium hydroxide solution at room temperature according to Claisen-Schmidt condensation and another five novel chalcones were prepared by refluxing 3-acetyl coumarin with aldehydes in the presence of piperidine in ethanol. All these compounds were...

New Sensitive Spectrophotometric Methods for the Determination of Raloxifene Hydrochloride in Pharmaceuticals Using Bromate-Bromide,Methyl Orange and Indigo Carmine

Two new sensitive spectrophotometric methods are proposed for the determination of raloxifene hydrochloride (RLX) using bromate-bromide mixture and two dyes, methyl orange and indigocarmine, as reagents. The methods entail the addition of a known excess of bromate-bromide mixture to RLX in hydrochloric acid medium followed by determination of residual bromine by reacting with a...

Synthesis, Characterization and Study of the Biological activity of Some Aldimines Derivatives

A number of imines derivatives have been synthesized, they were obtained by condensation of aromatic aldehyde derivatives with primary aromatic amine derivatives. Their structures have been characterised by IR, 1H NMR in addition to the elemental analysis. The biological activity of these imines (which are also known as Schiff bases) were examined against different type of...

Synthesis and Antifungal Activity of Azetidinone and Thiazolidinones Derivatives of 2-Amino-6-(2-naphthalenyl)thiazolo[3,2-d]thiadiazole

2-Amino-6-(2-naphthalenyl)thiazolo[3,2-d]thiadiazole [1] was prepared by treatment of KCNS and Br2 on 2-Amino-4-(2-naphthalenyl) thiazole. This amine on facile condensation with aromatic aldehydes afford Schiff Base/anils/azomethines(2a-h). These anils on cyclocondensation reaction with chloro acetyl chloride and thio glycolic acid (i.e. mercapto acetic acid) afford 2...

Simple Sensitive Spectrophotometric Determination of Vanadium in Biological and Environmental Samples

Novel, rapid, highly sensitive and selective spectrophotometric method for the determination of traces of vanadium (V) in environmental and biological samples, pharmaceutical and steel samples was studied. The method is based on oxidation of 2,4- dinitro phenyl hydrazine(2,4-DNPH) by vanadium (V) followed by coupling reaction with N-(1-naphthalene-1-yl)ethane-1,2-diamine...

Studies on Novel Bisaryl hydrazino-s-triazine Derivatives

Various 2-phenyloxy-4,6-bisarylhydrazino-1,3,5-triazines(3a-f) were prepared by reaction of 2- phenyloxy -4,6-dichloro -1,3,5-triazine and various aryl hydrazine derivatives. All the 3a-f derivatives were characterized by elemental analysis and IR spectral studies. All the compounds were screened for microbial activity against gram-positive and gram-negative bacteria.

Impact of Textile Effluents on Fresh Water Fish Mastacembelus Armatus (Cuv. & Val)

The textile effluents has been proved to impart adverse effects on humans, animals and plantation. The present study reveals that the impact of textile effluents on a protenious edible fresh water fish Mastacembelus Armatus by examining the changes in the ionic regulations of some selected tissues like liver , kidney and muscle before and after exposure to the Acid Blue 92 (CI.No...

Microwave Assisted Synthesis of Some Biologically Active Benzothiazolotriazine Derivatives

Synthesis of some biologically active benzothiazolotriazine derivatives by microwave irradiation is reported. 2-Amino-6-substituted benzothiazoles 1 on treatment with benzaldehyde in anhydrous ethanol afforded 2-benzylidenoimino-6-substitutedbenzothiazoles 2 which underwent cyclisation with ammoniumthiocyanate in dioxane to give 2-phenyl benzothiazolo [3,2-α]-s-triazine-4-[3H...

Dielectric Properties of the System GdCo 1-xFexO3 Synthesized by Chemical Route (x = 0.10, 0.20)

The perovskite oxides GdCo1-xFexO3 (x = 0.10, 0.20) were prepared by chemical method. The dielectric behavior of compositions with x = 0.10 and 0.20 in the system GdCo1-xFexO3 was studied in the temperature range 300-500 K. It is observed that dielectric constant increases with increasing Fe2

Synthesis and Antibacterial Activity of Some New Phenothiazine Derivatives

A series of some new phenothiazine derivatives were synthesized with the objective for evaluation as antimicrobials. The title compounds were prepared by a five step synthesis scheme. 2-Amino-6-substituted benzothiazoles (1) on diazotization afford 6-substituted benzothiazolyl-2-diazonium chlorides (2). Reaction of 2 with cold solution of β-naphthol in dilute NaOH furnishes α-(2...

Extractive Spectrophotometric Methods for the Determination of Rosuvastatin Calcium in Pure Form and in Pharmaceutical Formulations by Using Safranin O and Methylene blue

Two simple extractive Spectrophotometric methods are described for the determination of rosuvastatin calcium (RST) in pure form and in pharmaceutical formulations. These methods are based on the formation of ion association complexes of the RST with basic dyes safranin O (Method A) and methylene blue (Method B) in basic buffer of pH 9.8 followed by their extraction in chloroform...

Synthesis of 2-[4-(10H-Substituted Phenothiazine-3-yl)-6-Pyrimidin-2-Phenylthiol/ol/amine/thiol] Pyrroles

2-[4-Hydroxy benz-1(propene-1-one)]Pyrrole II on treatment with phenyl thiourea, guanidine carbonate, urea and thiourea in alcoholic KOH yielded compounds III, IV, V, VI which on treatment with different aryl anilines gave compounds VII, VIII, IX, X which under goes cyclisation with sulphur and iodine to give 2-[4-(10H-substituted phenothiazine-3-yl)-6-pyrimidin-2-phenylthiol/-ol...

Studies on Synthesis of Pyrimidine Derivatives and their Pharmacological Evaluation

1,3,4-Oxadiazoles were associated with broad spectrum of biological activities including antituberculosis, anticonvulsant, anti-inflammatory, insecticidal, antifungal, analgesic and antitumor properties. Morpholine derivatives find their wide spectrum of antimicrobial activity and exhibit anthelmintic, bactericidal and insecticidal activity. Pyrimidine derivatives are also...

Spectrophotometric Determination of Raloxifene Hydrochloride in Pharmaceutical Formulations

Three new simple, sensitive, rapid and economical spectrophotometric Methods (A, B and C) have been developed for the determination of Raloxifene Hydrochloride in pharmaceutical bulk and tablet dosage form. Method A is based on the formation of yellow colored chromogen with 0.1N Sodium hydroxide exhibiting maximum absorbance against the corresponding reagent blank. The method B...

Chemoselective Preparation of 1,1-Diacetates from Aldehydes, Mediated by a Keggin Heteropolyacid Under Solvent Free Conditions at Room Temperature

A simple, general and efficient method has been developed for the conversion of aldehydes to 1,1-diacetates using acetic anhydride, a catalytic amount of non commercial Keggin heteropolyacid (H6 PalMo11O40) (1% mol) in solvent free conditions at room temperature. Aromatic and aliphatic, simple and conjugated aldehydes were protected with excellent yields.

Application of Activated Carbon for Removal of Arsenic Ions from Aqueous Solutions

The activated carbon (AC) was used for removal of As(III) and As(V) ions from aqueous solutions. Sorption experiments were conducted using both batch and column systems. The effect of some important parameters on sorption of these by AC was studied. It was found that among the different factors affecting sorption capacity and efficiency in removal of arsenic from aqueous...

Titrimetric and Spectrophotometric Determination of Metaprolol tartrate in Pharmaceuticals Using N-Bromosuccinimide

One titrimetric and two spectrophotometric methods are presented for the assay of metaprolol tartrate (MPT) in bulk drug and in tablets. The methods employ N-bromosuccinimide (NBS) as the oxidimetric reagent and two dyes, methyl orange and indigo carmine as spectrophotometric reagents. In titrimetry, an acidified solution of MPT is treated with a known excess amount of NBS and...

A Study of Substituted Aliphatic Sulphides on the Corrosion Behaviour of Zinc in Ammonium Chloride Solution

Sulphur containing organic compounds decreases the corrosion rate by increasing the hydrogen over potential on zinc metal due to their electron donating groups. Their inhibiting effect was found to be associated with their adsorption on the active centers of the metal. The inhibition efficiencies of some aliphatic sulphides in ammonium chloride solution have been studied by...

Optimization of Protease Production from Aspergillus Oryzae Sp. Using Box-Behnken Experimental Design

Protease production by Aspergillus oryzae was optimized in shake-flask cultures using Box-Behnken experimental design. An empirical model was developed through response surface methodology to describe the relationship between tested variable (peptone, glucose, soyabeanmeal and pH). Maximum enzyme activity was attained with Peptone at 4 g∕L; temperature at 30 °C glucose at 6 g∕L...