RISS 검색 - 국내학술지논문

1
Species dependent aqueous biphasic extraction of some heavy metals

Debashree Das,Kamalika Sen 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2
A clean liquid–liquid extraction system was designed for extraction of three different heavy metals (Hg2+,Pb2+ and Bi3+) using an Aqueous Biphasic System consisting of a nonionic surfactant Triton X-100 in combination with two different salts viz., magnesium sulphate and sodium citrate. The extraction was monitored in two ways, by direct partitioning as well as by forming a complex with diphenylthiocarbazone (dithizone) for each metal ion in the Triton phase and measuring the colour intensity using a spectrophotometer. The change in extraction pattern at different pH of the salt rich phase was monitored. The possible change in speciation of these metal ions with pH was checked with the software programme ‘CHEAQS’ (Chemical Equilibria in Aquatic Systems). These heavy metals were also found to have higher extraction in the Triton phase when a prior complexation with dithizone was performed. The method may find extensive applications for the removal and decontaminations of the above mentioned toxic heavy metals from a sample.
2
Cloud point extraction: A sustainable method of elemental preconcentration and speciation

Pallabi Samaddar,Kamalika Sen 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Trace elements are gaining increasing attention of scientists working in various analytical fields. Presence or absence of a trace element in a system seriously modifies its intrinsic behavior. Cloud point extraction (CPE) is an upcoming technology to preconcentrate and separate many of the trace elements from different chemical and biological systems. The system is sustainable as it involves benign extractants like surfactants and that too at low concentrations at slightly elevated temperatures to form clouds that separate out from the bulk solution. In addition, the extraction behavior of many elements depends on its chemical species. Keeping in view the need to summarize the research encompassing this technique, many review articles were published which cover a selection of the literature published on this topic over several time spans. A myriad of various technological developments has been reported by several workers. These developments have prompted us to revisit the CP technology with a better understanding of its detection, mechanism and extension to species dependent extraction behavior with regard to the state of art determination of trace metals in our day to day applications. The present article summarizes mainly the results of trace metal preconcentration using CP methodology from different practical samples with an insight to the probable mechanism and speciation involved from 2006 onwards.
3
Species dependent sustainable preconcentration of zinc: Possible aspects of ABS and CPE

Pallabi Samaddar,Kamalika Sen 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
The environmentally benign extraction systems like aqueous biphasic system (ABS) and cloud pointextraction (CPE) techniques are well exploited for their applications in elemental speciation analysis. Inthis article we have studied the extraction possibility of different Zn species using ABS and CPE. Theextractions are studied at trace concentration levels in the presence and absence of different interferingcations and anions to find the possibility to preconcentrate Zn in the presence of other elements. It hasbeen observed that using CPE, a complete extraction of Zn-PAN is possible with Cu(II) as a potentialinterfering ion. Using ABS, 82% extraction of Zn as Zn-insulin complex is possible with no considerableinterference from the associated metal ions. However, the anions like PO43 , SCN and NO2 ions do interfere. Finally, the clouds of the CPE were taken for confocal microscopy after dissolution in suitablemedia. The images demonstrate the mechanism of micellization of different Zn species. The nanometersized vesicles with the Zn species incorporated in it indicates a stronger extraction possibility of the CPEthan ABS. The results are indicative of the methodology to be chosen for Zn extraction as per the need ofthe analyst.
4
Peanut proteins: Applications, ailments and possible remediation

Sumanta Kumar Ghatak,Kamalika Sen 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
Peanut is an annually grown plant and the chiefly cultivated species is Arachis hypogaea L. Mainly three types of proteins, arachin, conarachin I and conarachin II are present in peanut. It is an important and cheap source of protein. It can also cause allergic reactions in human beings. The peanut protein contains two components, Ara h 1 and Ara h 2 which are mainly responsible to cause allergy. Different remedial measures have been proposed to fight with the allergenic property of peanut proteins such as treatment with peroxidase, phytic acid, active charcoal, and various enzymes to minimize allergenic effect. Improper storage of peanuts causes growth of a fungal organism that releases aflatoxin, which is a carcinogen to mammals. Use of aluminosilicate clay, gamma irradiation, ozonation methods have been discussed for aflatoxin decontaminated from peanut. In this critical review, we have given an overview of the different extraction procedures of the peanut proteins and pointed out the methodologies to minimize allergenic actions and detoxification of the aflatoxin contamination in peanut.

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