http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Rahul Sharma,Arthanareeswaran Karunambigai,Somlee Gupta,Neelakantan Arumugam 경희대학교 융합한의과학연구소 2022 Oriental Pharmacy and Experimental Medicine Vol.22 No.4
Acmella ciliata (HBK) Cass. (basionym: Spilanthes ciliata HBK) is an herb of high medicinal value. Spilanthol, the prime N-alkamide in A. ciliata, is used as an active ingredient in several anti-ageing herbal tonics and in mouth washes. Here we describe quantification of spilanthol, phenolics, flavonoid and antioxidant activity in the methanol extracts prepared from flower, leaf, root and stem of the plant. HPLC of the sample extracts revealed that spilanthol was found to be maximum in flowers (18.44 mg/g), as compared to other parts of the plant as well as several of other Acmella (syn: Spilanthes) species. Estimation of phenolics and flavonoids in the extract by spectrophotometry with their values expressed respectively as equivalence of gallic acid (GAE) and quercetin (QE), revealed that phenolics content was highest in the flower extract (5.58 mg GAE/g), whereas, flavonoid content was found maximum in the leaf extract (31.65 mg QE/g). Antioxidant activity of the extract remained proportional to phenolic content of the extract. Flower extract further showed highest free radical scavenging activity in DPPH and ABTS assays, as compared to the extracts from other parts of the plant. Pearson’s correlation for antioxidant activity with respect to the phenolic and flavonoid content turned out to be positive. To the best of our knowledge this is the first report on quantification of the three secondary metabolites considered here and the antioxidant activity in the methanol extract prepared from different parts of A. cilitata.
Ananth, A.,Arthanareeswaran, G.,Ismail, A.,Mok, Y.S.,Matsuura, T. Elsevier 2014 Colloids and surfaces. A, Physicochemical and engi Vol.451 No.-
This article reports the modification of polyethersulfone (PES) membrane using silver nanoparticles (n-Ag), their characterizations and protein separation performances. As a bio-mediated synthesis route, gram-positive Bacillus subtilis bacterial supernatants were employed for preparing n-Ag. The resulting n-Ag exhibited uniform and well defined spherical morphology with size less than 50nm. The effect of the incorporation of n-Ag on PES membrane in terms of cross sectional morphology, surface roughness, crystallinity and hydrophilicity were investigated systematically. XPS analysis showed that a significant portion of silver was in silver oxide form. Depth profiling by argon plasma etching and XPS showed the partition of Ag<SUB>2</SUB>O and Ag between the membrane surface and the bulk. A minor oxidation on the surface of the silver was observed whereas the internal structure of the membrane retained Ag in its metallic state. The potential of the nano composite membrane for the separation of BSA with varying feed concentration and transmembrane pressure were performed. At 1.5wt% loading of n-Ag in neat PES, enhancement in bovine serum albumin (BSA) flux and decrease in the rejection were observed. The results and performance of the PES/n-Ag nanocomposite membranes indicate that it would be a deserving candidate for future industrial separations. The experimental results confirm that the incorporation of Ag nanoparticles in PES UF membrane can increase hydrophilicity and reduce the fouling.
S. Elakkiya,G Arthanareeswaran 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-
Bisphenol A (BPA) is identified endocrine-disrupting compounds (EDCs) that is detected in waterresources. The intrinsic properties of nanoclays favor to stimulate the combination of sieving and electrostaticinteraction mechanisms during the removal of BPA using membrane separation. Herein, the synthesisedhydrophilic bentonite-polyaniline (B-PANI) and cloisite 15A-polyaniline (C-PANI) was loadedindividually into polyethersulfone (PES) for fabricating mixed matrix membranes (MMMs). The PANInanoclays was presented in both surface layer and inside pores of nanocomposite membranes at 0.5, 1and 1.5 wt% loading. The results showed the enhancement in surface hydrophilicity for all the membranesin loading of PANI nanoclays. The presence of B-PANI influenced the higher water flux of 82.2Lm-2h1 at 1.5 wt%, indicating hydrophilic property. YBP2 MMM with 1 wt% B-PAN depicted higherBPA rejection efficiency of 77.2 %. B-PANI bestow the MMM with hydroxyl and amine functional groupswhich retard the transport of hydrophobic BPA through the hydrophilic MMM. Further, higher BPA rejectionwas ascribed to the electrostatic repulsion between MMM surface and BPA. The fouling mechanismwas identified by Hermia model that represents YBP2 membrane revealed cake filtration fouling modelwith reversible fouling. This work highlights the feasibility of B-PANI in MMM for BPA removal fromwater.
Umapriya R,Manisha Vidyavathy S,Arthanareeswaran G,Rohan J,Poorna A R 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3
The solution for water scarcity problem can be accomplished by treating the domestic & industrial wastewater with differenttreatment techniques. In this study, Polyethersulfone (PES) membranes were prepared with 0%, 0.25%, 0.5%, 0.75% and 1%wt% of SiO2 and ZrSiO4 as two different modifying agents. Phase inversion method is used for membrane preparation withN-methyl pyrolidone (NMP) as a solvent and Sodium Lauryl Sulphate (SLS) and water mixture as a non-solvent. Themorphology and pore size were analysed by Scanning Electron Microscopy (SEM). The crystallinity was verified with the helpof X-Ray Diffraction Techniques (XRD) and the identification of organic and inorganic groups were done using FourierTransform Infra-Red Spectroscopy (FTIR). The pure water flux rate analysis was carried out for all the membrane withvacuum filtration setup. The performance of the different membranes was analysed with tannery effluent and textile effluent. SEM image shows a two-layered structure where the top surface is porous followed with the homogeneous bottom surfacemembrane. The pore size and number of pores increased with the addition of inorganic materials. The results show that themoderate reduction in Total Suspended Solids (TSS), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD),Total Dissolved Solids (TDS), chlorides etc.
Om Ariara Guhan, C.P.,Arthanareeswaran, G.,Varadarajan, K.N.,Krishnan, S. Society for Computational Design and Engineering 2016 Journal of computational design and engineering Vol.3 No.3
Oval substrates are widely used in automobiles to reduce the exhaust emissions in Diesel oxidation Catalyst of CI engine. Because of constraints in space and packaging Oval substrate is preferred rather than round substrate. Obtaining the flow uniformity is very challenging in oval substrate comparing with round substrate. In this present work attempts are made to optimize the inlet cone design to achieve the optimal flow uniformity with the help of CATIA V5 which is 3D design tool and CFX which is 3D CFD tool. Initially length of inlet cone and mass flow rate of exhaust stream are analysed to understand the effects of flow uniformity and pressure drop. Then short straight cones and angled cones are designed. Angled cones have been designed by two methodologies. First methodology is rotating flow inlet plane along the substrate in shorter or longer axis. Second method is shifting the flow inlet plane along the longer axis. Large improvement in flow uniformity is observed when the flow inlet plane is shifted along the direction of longer axis by 10, 20 and 30 mm away from geometrical centre. When the inlet plane is rotated again based on 30 mm shifted geometry, significant improvement at rotation angle of $20^{\circ}$ is observed. The flow uniformity is optimum when second shift is performed based on second rotation. This present work shows that for an oval substrate flow, uniformity index can be optimized when inlet cone is angled by rotation of flow inlet plane along axis of substrate.
A novel method: mixed matrix membrane – An overview
R Umapriya,J Rohan,S Manisha Vidyavathy,Thenmuhil,G Arthanareeswaran 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.3
The development of India into a modern country is slow but the population growth is rapid. Pure air, water and soil are thethree important things for a day to day life in the current scenario. Pure form of these three is must. Nowadays many waterresources, soils and air in the environment are polluted due to massive increase in population growth, industrialization andmodern Urbanization. The heavy metals, dyes, pesticides etc., are mainly polluting the water bodies. In current scenario theworld is in the need of treating water bodies, wastewater and sea water to reduce the water scarcity level. All wastewater andwater treatment processes possess at least one separation process in the treatment units. Membrane separation process isplaying a main role in the treatment process. In this study, the different types of conventional and advanced treatmentprocesses were discussed. Membrane treatment techniques, Types of membranes, materials which can be used for membranepreparation, advantages and disadvantages of each materials, performance of organic membrane (polymeric membrane),performance of inorganic membrane (ceramic membrane) and membrane fabrication methods were also discussed in thisstudy. To overcome the drawbacks, the new innovative idea was derived and discussed.