Journal of Chemistry

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

List of Papers (Total 193)

Assessment of Ground Water Quality in and around Gobichettipalayam Town Erode District, Tamilnadu

Ground water samples collected from different localities in and around Gobichettipalayam town, Erode District, Tamil Nadu were analyzed for their physico- chemical characteristics. This analysis result was compared with the WHO & ICMR standards of drinking water quality parameters with the following water quality parameters namely pH, Electrical conductivity, CN-, Cl-, SO42-, Na

in vitro Antioxidant Activity and Total Polyphenolic Content of Cyperus rotundus Rhizomes

In this study, Antioxidant activity of Cyperus rotundus rhizomes extract (CRRE) was evaluveted in a series of in vitro assay involving free radicals and reactive oxygen species and IC50 values were determined. CRRE exhibited its scavenging effect in concentration dependent manner on superoxide anion radicals, hydroxyl radicals, nitric oxide radical, hydrogen peroxide, and...

Kinetics and Mechanism of Oxidation of L-Cystine by Hexacyanoferrate(III) in Alkaline Medium

Kinetics of oxidation of L-cystine by hexacyanoferrate(III) was studied in alkaline medium at 30 °C. The reaction was followed spectrophotometrically at λmax = 420 nm. The reaction was found to be first order dependence each on [HCF(III)] and [cystine]. It was found that the rate of the reaction increases with increase in [OH-]. The oxidation product of the reaction was found to...

Preparation of Biodiesel through Transesterification of Animal Oil and AlcoholUnder the Catalysis of SO42- / TiO2

Biodiesel was obtained through transesterification of animal oil and ethanol under the catalysis of SO42- / TiO2 We have inspected the activation of SO42- / TiO2prepared under different dipping vitriol concentration,baking activation temperature. The optimum conditions to prepare SO42- / TiO2are; dipping vitriol concentration of TiCl4 hydrolysis product is 1.5 mol / L, baking...

Effect of Various Additives on Photocatalytic Degradation of 4-Nitrophenol

The photocatalytic degradation of 4-nitrophenol (4-NP) assisted by titanium dioxide (TiO2) was investigated in aqueous suspension under irradiation by UV light. The effect of different supporting materials mixed physically with TiO2on the photocatalytic degradation of 4-NP has been studied. TiO2 with all supports exhibits good degradation efficiency of 4-NP and was better than...

Liquid Chromatographic Method for Determination of Nisoldipine from Pharmaceutical Samples

A simple and specific high performance thin layer chromatographic method was developed and validated for the determination of nisoldipine from tablet dosage form. The method was carried out at 320 nm after extraction of drug in methanol. The method uses aluminum plates pre-coated with silica gel 60F-254 as stationary phase and cyclohexane-ethyl acetate-toluene (3:3:4, v/v/v) as...

Syntheses and Reactions of 4′-[(ω-Bromoalkyl)oxy]-and 4′,4′′′-(Polymethylenedoxy)-bis Substituted Chalcones

Base catalyzed condensation of 4-hydroxyacetophenone (1) with several aldehydes resulted 4′-hydroxychalcones (2a-c). Reaction of α,ω -dibromoalkanes (3, n=2, 4 & 6) with (2a-c) in equimolar ratio resulted a mixture of 4′-[(ω-bromoalkyl)oxy]- substituted chalcones (4a-i) and 4′,4′′′-(polymethylenedioxy)-bis substituted chalcones (5a-i) separated by ethanol as soluble (4a-i) and...

Selective Extraction and Bulk Liquid Membrane Transport of Cu(II) from Aqueous Nitrate Solution in the Presence of Zn(II), Ni(II) and Mn(II) Cations Using Benzoyl Acetone

The competitive metal ion extraction and transport of Cu(II), Ni(II), Zn(II) and Mn(II) with benzoyl acetone and EDTA was studied. In the experiments the ligand was dissolved in chloroform and the pH and time of extraction or transport were varied. Also the rate of shaking and ligand concentration on the efficiency of extraction and transport was studied. The results revealed...

A New Cross-Shaped Graphite Furnace with Ballast Body for Reduction of Interferences in Atomic Absorption Spectrometry

A new crossed graphite furnace for atomic absorption spectrometry (GFAAS) was designed and installed in heated graphite atomizer (HGA500) combined with Perkin-Elmer spectrometer (AAS1100). The Tungsten ballast body was inserted inside one part of the crossed furnace in a way perpendicular to light path. The analyzed sample was injected manually on the ballast body inside the...

Pathogens and Heavy Metals Concentration in Green Leafy Vegetables

Presence of heavy metal and bacterial pathogen in randomly collected samples of green leafy from various stations of Bengaluru city was detected. Heavy metals (cadmium, zinc, copper, iron, chromium, nickel and lead) were analyzed by tri-acid digestion method. The presence of heavy metals in general was in the order of Cd>Zn>Cu>Fe>Cr>Pb. Trace metal concentration in all green...

Kinetics and Isotherm Studies of Copper Removal by Brushite Calcium Phosphate: Linear and Non-Linear Regression Comparison

Interactions of Cu(II) ions with calcium phosphate Brushite (DCPD) in aqueous solutions were investigated by batch conditions and under several sorption parameters like contact time, pH of solution and initial metal concentration. The retention of copper was found maximum and dominated by exchange reaction process in the pH range 4-6. The reaction process was found initially fast...

Synthesis, Chacterization, and Thermal Study of Terpolymeric Resin Derived from m-cresol, Hexamine and Formaldehyde

Terpolymeric resin was prepared from m-cresol (0.1M), hexamine (0.05M) and formaldehyde (0.2M) by acid catalyzed polycondensation method using 1M HCl in temperature range of 122-130°C.The resin was abbreviated as m-CHF-I. The molecular weight of terpolymer was determined by non-aqueous conductometric titration technique. The structure of resin was determined by its elemental...

Synthesis, Characterization, and Antibacterial and Anti-Inflammatory Activities of New Pyrimidine and Thiophene Derivatives

Substituted[4,5]thieno[2,3-d]thiazolo[3,2-a]pyrimidin-5-one (3a–b) and pyrimidin-5(6H)-imine (3c–e) were synthesized via reaction of the starting compounds, ethyl 2-amino-substituted[b]thiophene-3-carboxylate (2a–c) and 2-amino-substituted [b]thiophene-3-carbonitrile (2d–f), respectively, with 2-bromothiazole. Synthesis of (bromo-substituted[b]thiophen-2-yl)alkanamide derivatives...

Nutritional and Biological Evaluation of Leaves of Mangifera indica from Mauritius

Mango trees are evergreen plants that are present all around Mauritius. In this study, mango leaves, Mangifera indica grown in Mauritius were investigated for their nutritional values involving proximate composition, total flavonoid (TFC), total phenolic (TPC), and mineral content, and phytochemicals as well as its antioxidant and antibacterial properties. The ash, crude fat...

L-Proline-Catalyzed Synthesis of Phthalimide Derivatives and Evaluation of Their Antioxidant, Anti-Inflammatory, and Lipoxygenase Inhibition Activities

A study was planned to synthesize the phthalimide derivatives as phthalimides have versatile biological activities. To synthesize the phthalimide derivatives, initially the reaction was optimized with various catalysts, and L-proline was found to be the best catalyst as it provided excellent yield. A series of phthalimide derivatives was synthesized by facile one-top reaction of...

Thermal Processing Effects on the Chemical Constituent and Antioxidant Activity of Okara Extracts Using Subcritical Water Extraction

Subcritical water extraction (SWE) has been employed for the extraction of bioactive compounds from plant materials with cost-effectiveness, less consuming time, and environmental sustainability. To explore the effects of thermal processing during SWE, total organic content (TOC), total sugar, polysaccharides, total phenolic content (TPC), total flavonoid content (TFC), and...

Resveratrol Functionalized Carboxymethyl-β-Cyclodextrin: Synthesis, Characterization, and Photostability

The resveratrol functionalized carboxymethyl-β-cyclodextrin conjugate was synthesized by two simple steps. The conjugate was successfully demonstrated by 1H NMR, 13C NMR, UV, and FTIR. The photostability of the conjugate was studied by ultraviolet absorption spectrum. After 360 min of UV light irradiation, the conjugate showed a total loss in absorbance of only 12.54%, while the...

Global Sensitivity Analysis of Large Reaction Mechanisms Using Fourier Amplitude Sensitivity Test

Global sensitivity analysis (GSA) of large chemical reaction mechanisms remains a challenge since the model with uncertainties in the large number of input parameters provides large dimension of input parameter space and tends to be difficult to evaluate the effect of input parameters on model outputs. In this paper, a criterion for frequency selection to input parameter is...

Feed Additives Produced on the Basis of Organic Forms of Micronutrients as a Means of Biofortification of Food of Animal Origin

In recent years, there has been a steadily growing demand for animal protein. Consumer awareness is also growing every year, which is why breeders are obliged to provide animals with the best possible environmental conditions that will determine the productivity of animals and the quality of raw materials obtained from them. Today's consumer is looking for not only the highest...

Synthesis, Characterization, and Antibacterial and Anti-Inflammatory Activities of New Pyrimidine and Thiophene Derivatives

Substituted[4,5]thieno[2,3-d]thiazolo[3,2-a]pyrimidin-5-one (3a–b) and pyrimidin-5(6H)-imine (3c–e) were synthesized via reaction of the starting compounds, ethyl 2-amino-substituted[b]thiophene-3-carboxylate (2a–c) and 2-amino-substituted [b]thiophene-3-carbonitrile (2d–f), respectively, with 2-bromothiazole. Synthesis of (bromo-substituted[b]thiophen-2-yl)alkanamide derivatives...

The Gas-Phase Heats of Formation of n-Alkanes as a Function of the Electrostatic Potential Extrema on their Molecular Surfaces

The hybrid density functional B3LYP is employed to map the molecular electrostatic potentials on the surfaces of twenty normal alkanes, (Cn H2n

Synthesis, Characterization, Chelating Properties and Anti-Fungal Activity of 2-(4-Phenylpiperazinyl) Methyl-3-(8-Quinolinol-5-YL)- 4(3H)-Quinazolinone

A new quinazolinone derivative namely 2-(4-phenylpiperazinyl)methyl-3-(8-quinolinol-5-yl)- 4(3h)-quinazolinone(HL) was prepared and characterized. Various transition metal (Cu2

Synthesis of Some Aryl Chalcones Using Silica-Sulphuric Acid Reagent under Solvent Free Conditions

There are two series of α, β-unsaturated ketones derived form Biphenyl and 9H-Fluorenyl, and ketones with various substituted benzaldehydes under solvent free conditions using silica-sulphuric acid as a reagent in an oven. The catalyst silica is reusable and the yields of chalcones are more than 90%. These chalcones are characterized by physical constants and spectral data.

Studies on Novel Bisaryl Hydrazino-s-triazine Derivatives - Part 2

Various 2(4-chloro phenyloxy)-4,6-bisarylhydrazino-1,3,5-triazines(3a-f) were prepared by reaction of 2(4-chloro 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...

Syntheses and Characterization of Some Tetradentate Schiff-Base Complexes and Their Heteroleptic Analogues

VO(IV), Ni(II) and Cu(II) complexes of the asymmetric Schiff base [(HOC6H3(OCH3)C(C6H5):N(CH2CH2)N:C(CH3)CH:C(C6H5)OH)], and their heteroleptic analogues with triphenyl phosphine and 2,2’-bipyridine have been synthesized and characterized by elemental analyses, conductance, magnetic, infrared and electronic spectral measurements. The ligand is tetradentate coordinating via the...