Volume-13 ~ Issue-11 ~ November 2020

Abstract: Drinking water deserves immediate attention from the point view of public health. This paper presents arsenic contamination in different drinking water sources of some of the villages of different blocks (Katihar, Manihari, Amdabad and Barari block) of Katihar district. A total of 1986 samples collected during March 2012 to Feb 2015 from different drinking water sources (Tubewell, Dugwell, Municipal supply, Railway supply and River Ganga) of different villages of Katihar dist. were analyzed for arsenic concentration. Of the total 1986 water sampes, only 63.69% samples had arsenic less than 10 μgL-1 (WHO limit) and were safe for drinking. 25.13% samples had arsenic between 10 to 50 μgL-1, 8.16% samples had arsenic between 51 to100 μgL-1, 3.02% samples had arsenic between 101 to 500 μgL-1. 43.73% tube well water, 6.48% dug well water and 14.06% samples of river Ganga water were contaminated with more than 10 μgL-1 arsenic. Maximum arsenic contamination was recorded in tube well water and minimum......

Key words: Arseniccontamination;Drinking water; Tube well; Dug wel;, Rriver Ganga; Railway supply; Municipal supply; Katihar district

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Abstract: Malolactic fermentation is caused in red wines when alcoholic fermentation is ended. The great importance of this fermentation is the capability to improve the organoleptic characteristics of wines. In order to cause malolactic fermentation we used lactic bacteria and especially the kind of Bacteries lactiques OEnococcus oeni. Several factors influence the action of bacteria and of course the progress of malolactic fermentation. Especially in the present article we studied the following conditions: Change of temperature, start of malolactic fermentation without addition of lactic bacteria, addition of double quantity of lactic bacteria.

Keywords: Malolactic fermentation, lactic bacteria, red wines

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Abstract: A simple, rapid, sensitive and cost effective spectrophotometric technique for the determination of copper (II) using 3-hydroxy-3-m-tolyl-1-O-carboxyphenyltriazene has been reported. The complex formed was greenish-yellow having stoichiometry of 1:1 (Cu (II): hydroxytriazene) at a pH range of 6.0-6.6. The measurements were carried out at a working wavelength of 405nm with a molar absorptivity of 2.8×104Lmol-1cm-1and sandell's sensitivity of 2.26ng/cm2. Lambert –Beer's law is obeyed over a range of 1.27-7.63mg/L of copper. The correlation coefficient of the standard calibration curve was 0.997. The complex formed between copper (II) and hydroxytriazene was greenish –yellow with composition of 1:1(Cu (II): hydroxytriazene). The relative standard deviation (n=10) for standard dilution......

Keywords: spectrophotometric, copper (II), Cu(II) – Hydroxytriazene complex, molar absorptivity, Gibb's free energy, interference studies.

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Abstract: A new dissymmetrical ligand 1-(2-hydroxy-3-methoxybenzylidene)-5-(1-(pyridin-2-yl)ethylidene)carbohydrazide (H3L2) was synthetized from the precursor (1-(pyridin-2-yl)ethylidene)carbohydrazide (H5L1) which is obtained bya monocondensation reaction of carbohydrazide with 2-acetylpyridine.The two compounds were characterized by Physico-chemical analyses, elementalanalysis, FTIR,1H and 13C NMR spectroscopy techniques. The structures of the two compoundswere determined by single-crystal X-ray diffraction study. The precursor H5L1 (C8H11N5O) crystallizes in the monoclinic space group P21/c with the following unit cellparameters: a = 8.9329 (5) Å, b = 9.8728 (4) Å, c = 10.5538 (7) Å, β = 94.155 (7)°, V = 928.32 (9) Å3, Z = 4, R1 = 0.0445.....

Key Word: Carbohydrazide, o-vanillin, 2-acetylpyridine, X-ray.

[1]. Z. Moussa, M. Al-Mamary, S. Al-Juhani, S.A. Ahmed, Preparation and biological assessment of some aromatic hydrazones derived from hydrazides of phenolic acids and aromatic aldehydes, Heliyon, 2020, 6, e05019.
[2]. I.A. Khodja, H. Boulebd, C. Bensouici, A. Belfaitah, Design, synthesis, biological evaluation, molecular docking, DFT calculations and in silico ADME analysis of (benz)imidazole-hydrazone derivatives as promising antioxidant, antifungal, and anti-acetylcholinesterase agents, J. Mol. Struct., 2020, 1218, 128527.
[3]. B.S.K. Aktar, Y. Sıcak, T.T. Tok, E.E. Oruç-Emre, A.Ş. Yağlıoğlu, A.K. Iyidoğan, M. Öztürk, I. Demirtaş, Designing heterocyclic chalcones, benzoyl/sulfonyl hydrazones: An insight into their biological activities and molecular docking study, J. Mol. Struct., 2020, 1211, 128059.
[4]. Y. Han, Y. Tian, R. Wang, S. Fu, J. Jiang, J. Dong, M. Qin, Y. Hou, Y. Zhao, Design, synthesis and biological evaluation of thieno[3,2-d]pyrimidine derivatives containing aroyl hydrazone or aryl hydrazide moieties for PI3K and mTOR dual inhibition, Bioorg. Chem., 2020, 104, 104197.
[5]. K.D. Katariya, S.R. Shah, D. Reddy, Anticancer, antimicrobial activities of quinoline based hydrazone analogues: Synthesis, characterization and molecular docking, Bioorg. Chem., 2020, 94, 103406.

Abstract: N-ethyl-3-methyl indole was synthesized by treating ethyl iodide with 3-methyl indole in presence of sodium hydride in the solvent medium of DMF. N-ethyl-3-bromomethyl indole was prepared by reacting N-ethyl-3-methyl indole with NBS and benzoyl peroxide in the solvent medium of benzene. N-ethyl-3-(N,N-diethanol amino methyl) indole was synthesized by treating N-ethyl-3-bromomethyl indole with diethanolamine in presence of potassium carbonate and trace amount of 18-crown-6 in the solvent medium of DMSO. 4,4'-(hexafluoroisopropylidene)-diphthalimide was synthesized by reacting 4,4'-(hexafluoroisopropylidene)-diphthalic anhydride with urea by heating....

Key Word: N-ethyl-3-bromomethyl indole, N-ethyl-3- (N,N-diethanolamino methyl) indole, 4,4'- (hexafluoroisopropylidene) – diphthalimide, Polyimide.

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Abstract: The current study shows that Steric hindrance may cause retarding (slower) rate of oxidation. AA exhibit the capacity of formation of chelate-ring, but due to be –O-C2H5 group more electrons are released in comparison to methyl group of AA and therefore the amount of the enol content is decreased. the rate of oxidation of benzoyl acetone is found to be slower, than that of acetyl acetone while benzoylacetone has higher enolic content rather than acetylacetone. This fact may be explained by the extra stability of formation of chelate-ring with intramolecular hydrogen bonding of enol of acetyl acetone, conjugate effect, resonance and steric hindrance. A perusal of the proceeding result confirms that the activity of N-Chlorosaccharin is very much limited. This is due to the restricted activity on ketones and esters in ordinary medium of solvent. At the same time, it is also concluded that the presence of acid does increase the activity at relatively higher temperature. Even then this study certainly a worthy contribution to the field of chemical kinetics by opening a new field with NCSA......

Key Word: Kinetics, Oxidation, Acetone, Ester,N-Chlorosaccharin, Acetic Acid

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Abstract: The current study shows that the results are concordant for about 6-7 days. Again, to test the sensitivity of the method standard deviation was determined. The value found was around ± 0.01. Similarly, relative standard deviation and coefficient of variation was also determined. The method developed for the determination of pure fenthion was applied to polluted water. Various water samples were collected from agricultural fields, drains and sides of rivers, where the insecticides (fenthion) were sprayed. The samples were weighed and macerated with ethanol water mixture and filtered. Background: Water pollution is the alternation in physical, biological, chemical properties of water. Sometimes it produces harmful effects on human and aquatic biota.1-7 a major concern is the exploding population and increasing industrialization and urbanization. It creates a lot of water pollution through agricultural, municipal and industrial sources. Fenthion....

Key Word: Insecticide, Water Pollution, Chloramine-T Reagent

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Abstract: The current study shows that the survey of literature reveals that Chloramine-T In acidic medium has not been used for the determination of dithiocarbamate compounds, either in technical form or in their formulations. In the present work, a quick and convenient method has been developed for the determination of some Dithiocarbomate compounds like Zinc dimethyl dithiocarbamate (Ziram), Tetramethyl thiuram disulphide (Thiram), Zinc ethylene bis dithiocarbamate (Zineb), Ferric dimethyl dithiocarbamate '(Ferbam) and Zinc diethyl dithio carbomate (ZDC) in technical form and in their formulations. Background: The pesticides are group of chemicals intended for preventing/destroying any pest detrimental to man or his interest during production, processing, storage, transportation and distribution of food. These include insecticides, herbicides, fungicides rodenticides, nematicides, chemosterilents, molluscides, plant growth regulators, defoliants, desiccant, attractants, repellents and similarly active compounds. Materials and Methods: Aliquot....

Key Word: Chemical Studies, Fungicides, Water Pollution, Chloramine-T Reagent

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Abstract: The current study depicts that the determination of butane 1,3 diol, butane 2,3 diol, triethylene glycol, methanol, ethanol, n-propanol, n-butanol, 3-pentanol, propane 1,2 diol,and tetraethylene glycol with the use of V(v) reagent. The study also shows that the oxidizing capacity of ammonium metavanadate (v) with certain organic compounds, the oxidation of certain sugars was studied using an accurate and quantitative procedure has been described for the determination of certain mono and disaccharides on micro scale.
Background: Drugs are substances or products with a definite physiological activity that are used or intended to be used to modify or explore physiological....

Key Word: Medicinal Compounds,Alcohols, Sugars, Ammonium Metavanadate Reagent

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