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Phytochemical profiling of Artocarpus lakoocha Roxb. leaf methanol extract and its antioxidant, antimicrobial and antioxidative activities

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Asian Pacific Journal of Tropical Biomedicine 2019年第11期9卷 484-492页

作者： Ekta Bhattacharya Rajashree Dutta swati chakraborty Suparna Mandal Biswas Agricultural and Ecological Research Unit Indian Statistical Institute203B.T.RoadKolkata 700108India Guru Nanak Institute of Pharmaceutical Science&Technology Panihati Kolkata 700114India

Objective:To explore the phytochemical profile of Artocarpus lakoocha *** both qualitatively and quantitatively,and validate its role as a potent antioxidant and antimicrobial ***:Extraction and isolation of different compounds were done from the leaves of Artocarpus lakoocha based on solvent fractionation ***,quantitative and qualitative phytochemical profiling along with antioxidant,antimicrobial and antioxidative activities were tested following standard ***:Among the five fractions,methanol fraction of Artocarpus lakoocha exhibited higher content of phytochemical compounds[phenols=(3175.21±290.43)mg GAE/g dry extract,flavonoids=(1173.15±47.52)mg QE/g dry extract and tannins=(923.53±95.21)mg TAE/g dry extract]as compared to other *** methanol fraction showed the highest antioxidant activity in DPPH and ABTS radical scavenging assays with IC50 of(111.98±34.20)μg/mL and(138.26±0.66)μg/mL,respectively,and the best reduction potential with a value of(316.81±2.96)mg QE/g dry extract in reducing power *** was significant correlation between the amount of phytochemicals and antioxidant ***,the extract successfully protected Lambda phage DNA from damage at 5 and 6 mg/mL concentration and exhibited substantial bactericidal as well as fungicidal *** GC-MS analysis of methanol fraction of Artocarpus lakoocha revealed diethyl phthalate as the main phytochemical compound,along with 3,4-dihydroxymandelic acid,9-octyl eicosane and 7,8-didehydro-3-methoxy-17-methyl-6-methylene ***:The methanol fraction of Artocarpus lakoocha could be used as a potent antioxidant and antimicrobial agent for sustainable agriculture and pharmaceutical purposes.

关键词： Moraceae Bioactive compounds Natural pharmaceuticals Diethyl phthalate

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Effects of thermal radiation on Casson fluid flow and heat transfer over an unsteady stretching surface subjected to suction/blowing

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Chinese Physics B 2013年第11期22卷 362-368页

作者： swati Mukhopadhyay Department of Mathematics The University of Burdwan

The unsteady flow of a Casson fluid and heat transfer over a stretching surface in presence of suction/blowing are investigated. The transformed equations are solved numerically by using the shooting method. The exact solution corre- sponding to the momentum equation for the steady case is obtained. Fluid velocity initially decreases with the increase of unsteadiness parameter. Due to an increasing Casson parameter the velocity field is suppressed. Thermal radiation enhances the effective thermal diffusivity and the temperature rises.

关键词： unsteady flow Casson fluid stretching surface suction/blowing

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Dual solutions in boundary layer flow of a moving fluid over a moving permeable surface in presence of prescribed surface temperature and thermal radiation

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Chinese Physics B 2014年第1期23卷 279-283页

作者： swati Mukhopadhyay Department of Mathematics The University of Burdwan Burdwan-713104 W. B. India

An analysis of the heat transfer for a boundary layer forced convective flow past a moving permeable flat surface parallel to a moving fluid is presented. Prescribed surface temperature at the boundary is considered, A thermal radiation term in the energy equation is considered. The similarity solutions for the problem are obtained and the reduced ordinary differential equations are solved numerically. To support the validity of the numerical results, a comparison is made with the available results for some particular cases of this study. Dual solutions exist when the surface and the fluid move in the opposite directions.

关键词： moving fluid prescribed surface temperature suction thermal radiation

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Heat Transfer Analysis of the Unsteady Flow of a Maxwell Fluid over a Stretching Surface in the Presence of a Heat Source/Sink

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Chinese Physics Letters 2012年第5期29卷 165-168页

作者： swati Mukhopadhyay Department of Mathematics The University of BurdwanBurdwan-713104W.B.India

The unsteady two-dimensional flow of a MHD non-Newtonian Maxwell fluid over a stretching surface with a prescribed surface temperature in the presence of a heat source/sink is *** solutions for the governing equations are *** transformed boundary layer equations are then solved numerically by using the shooting *** velocity initially decreases with the increasing unsteadiness parameter,and temperature decreases significantly due to *** is also found that the fluid velocity decreases with the increasing magnetic *** the Maxwell parameter values has the effect of suppressing the velocity field and increasing the temperature.

关键词： temperature. parameter. method.

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Heat Transfer in a Moving Fluid over a Moving Non-Isothermal Flat Surface

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Chinese Physics Letters 2011年第12期28卷 183-186页

作者： swati Mukhopadhyay Department of Mathematics The University of BurdwanBurdwan-713104W.B.India

Boundary layer forced convective flow and heat transfer passing a moving flat surface parallel to a moving stream are *** power-law surface temperature of the second degree at the boundary is *** similarity solutions for the problem are obtained and the reduced ordinary differential equations are solved *** numerical results are compared with the known results from the literature for some special cases of the present study to support their *** is found that dual solutions exist when the surface and the fluid move in opposite directions.

关键词： moving ordinary directions

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Casson fluid flow and heat transfer over a nonlinearly stretching surface

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Chinese Physics B 2013年第7期22卷 298-302页

作者： swati Mukhopadhyay Department of Mathematics the University of Burdwan

A boundary layer analysis is presented for non-Newtonian fluid flow and heat transfer over a nonlinearly stretching surface. The Casson fluid model is used to characterize the non-Newtonian fluid behavior. By using suitable transformations, the governing partial differential equations corresponding to the momentum and energy equations are converted into non-linear ordinary differential equations. Numerical solutions of these equations are obtained with the shooting method. The effect of increasing Casson parameter is to suppress the velocity field. However the temperature is enhanced with the increasing Casson parameter.

关键词： nonlinear stretching Casson fluid heat transfer similarity transformations

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LRS Bianchi Type-II Inflationary Universe with Massless Scalar Field and Time Varying Λ

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Chinese Physics Letters 2012年第8期29卷 42-44页

作者： Raj Bali swati Department of Mathematics University of RajasthanJaipur 302004India

The locally rotationally symmetric(LRS)Bianchi type-II inflationary cosmological model is investigated for massless scalar field with flat potential and time varyingΛ.To obtain the deterministic solution,it is assumed that scale factor is a(t)~e^(Ht) as we considered previously for Bianchi type-I spacetime andΛ~a^(-2) as considered by Chen and Wu,where H is the Hubble constant and effective potential V(φ)=const;φHigg's *** is shown that such a time varyingΛleads to no conflict with existing ***,it does change the predictions of standard cosmology in the matter-dominated phase and alleviates some problems in reconciling observations with the inflationary *** model represents anisotropic spacetime in ***,the model isotropizes for large values of t andβ=3H^(2),whereβis *** physical and geometrical aspects of the model in the context of an inflationary scenario is also discussed.

关键词： scenario field Bianchi

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Comparative cytotoxicity of nanoparticles and ions to Escherichia coli in binary mixtures

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Journal of Environmental Sciences 2017年第5期29卷 11-19页

作者： swati Srivastaua Arun Kumar Department of Civil Engineering Indian Institute of Technology Delhi New Delhi 110016 India

The objective of this study was to understand toxicity of mixture of nanoparticles （NPs）（ZnO and TiO2） and their ions to Escherichia coll. Results indicated the decrease in percentage growth of E. coli with the increase in concentration of NPs both in single and mixture setups. Even a small concentration of I mg/L was observed to be significantly toxic to E. coli in binary mixture setup （exposure concentration： 1 mg/L ZnO and 1 mg/L TiO2; 21.15% decrease in plate count concentration with respect to control）. Exposure ofE. coli to mixture of NPs at 1000 mg/L （i.e., 1000 mg/L ZnO and 1000 mg/L TiO2） resulted in 99.63% decrease in plate count concentration with respect to control. Toxic effects of ions to E. coli were found to be lesser than their corresponding NPs. The percentage growth reduction was found to be 36% for binary mixture of zinc and titanium ions at the highest concentration （i.e., 803.0 mg/L Zn and 593.3 mg/L Ti where ion concentrations are equal to the Zn ions present in 1000 mg/L ZnO NP solution and Ti＋4 ions present in 1000 mg/L TiO2 NP solution）. Nature of mixture toxicity of the two NPs to E. coli was found to be antagonistic. The alkaline phosphatase （Alp） assay indicated that the maximum damage was observed when E. coli was exposed to 1000 mg/L of mixture of NPs. This study tries to fill the knowledge gap on information of toxicity of mixture of NPs to bacteria which has not been reported earlier.

关键词： E. coli Zinc oxide nanoparticles Titanium dioxide nanoparticles Mixture toxicity Alkaline phosphatase assay

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Diffusion of chemically reactive species in Casson fluid flow over an unsteady permeable stretching surface

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Journal of Hydrodynamics 2013年第4期25卷 591-598页

作者： MUKHOPADHYAY swati VAJRAVELU Kuppalapalle Department of Mathematics The University of Burdwan Department of Mathematics Department of Mechanical Materials and Aerospace Engineering University of Central Florida

In this paper we investigate the two-dimensional flow of a non-Newtonian fluid over an unsteady stretching permeable surface. The Casson fluid model is used to characterize the non-Newtonian fluid behavior. First-order constructive/destructive chemical reaction is considered. With the help of a shooting method, numerical solutions for a class of nonlinear coupled differential equations subject to appropriate boundary conditions are obtained. For the steady flow, the exact solution is obtained. The flow features and the mass transfer characteristics for different values of the governing parameters are analyzed and discussed in detail.

关键词： chemical reaction Casson fluid mass transfer unsteady stretching suction/injection

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Boundary layer flow and heat transfer of a Casson fluid past a symmetric porous wedge with surface heat flux

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Chinese Physics B 2014年第4期23卷 390-395页

作者： swati Mukhopadhyay Iswar Chandra Mandal Department of Mathematics The University of Burdwan

The aim of this paper is to investigate numerically the boundary layer forced convection flow of a Casson fluid past a symmetric porous wedge. Similarity transformations are used to convert the governing partial differential equations into ordinary ones. With the help of the shooting method, the reduced equations are then solved numerically. Comparisons are made with the previously published results in some special cases and they are found to be in excellent agreement with each other. The results obtained in this study are illustrated graphically and discussed in detail. The velocity is found to increase with an increasing Falkner-Skan exponent whereas the temperature decreases. With the rise of the Casson fluid parameter, the fluid velocity increases but the temperature is found to decrease in this case. Fluid velocity is suppressed with the increase of suction. The skin friction decreases with the increasing value of Casson fluid parameter. It is found that the temperature decreases as the Prandtl number increases and thermal boundary layer thickness decreases with the increasing value of Prandtl number. A significant finding of this investigation is that flow separation can be controlled by increasing the value of the Casson fluid parameter as well as by increasing the amount of suction.

关键词： symmetric wedge Casson fluid heat flux suction/blowing

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