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Cochin, India

Irimpan M.T.,St. Josephs College | Jolly C.I.,Kerala Ayurveda Ltd | Sheela D.,St Teresas College
Nature Environment and Pollution Technology

The medicinal plant Gymnema sylvestre R. Br. is known for its antidiabetic potential. Preliminary phytochemical screening of stem and leaf samples of the herb showed positive testforflavonoids, hydrolysable tannins, phenols, saponins, sterols and terpanoids. The ash value is below the prescribed limit according to Ayurvedic Pharmacopeia. Antimicrobial activity was checked using agar well diffusion method. Water, methanoland ethanol extracts showed activity against Staphylococcus aureus. Bacillus subtilis is sensitive to hydroalcoholic and ethanolic extracts. The gram negative bacteria were resistant to the extracts. The antioxidant potential was assessed by DPPH assay method. The results provide evidence that Gymnema sylvestre leaf extract might indeed be potential source of free radical scavenger. Source

Dhanya V.S.,Mahatma Gandhi College | Sudarsanakumar M.R.,Mahatma Gandhi College | Suma S.,SN College | Ng S.W.,University of Malaya | And 3 more authors.
Inorganic Chemistry Communications

A new cerium-adipate metal-organic framework [Ce(C6H 8O4)(H2O)2(NO3)] was grown by simple gel diffusion technique at room temperature. The compound possesses a two dimensional network structure constructed from edge sharing CeO6(H2O)2(NO3) polyhedron. The adjacent polyhedrons are connected by the carboxylate ligand forming the 2D framework with bullet shaped channels running parallel to c axis. Thermal decomposition of the compound takes place in four steps and CeO2 is obtained as the final product. UV-visible spectra, solid state photoluminescence, and magnetic susceptibility measurements were also carried out at room temperature. © 2013 Elsevier B.V. Source

Saritha Chandran A.,Cochin University of Science and Technology | Saritha Chandran A.,St Teresas College | Narayanankutty S.K.,Cochin University of Science and Technology | Mohanan P.,Cochin University of Science and Technology
Polymer - Plastics Technology and Engineering

This report presents the microwave characteristics of conducting polymer composites (CPCs) based on chloroprene rubber with special reference to dielectric properties. CPCs based on polyaniline (PANI), polyaniline-coated short nylon fiber (PANI-N) and chloroprene rubber (CR) were prepared by mechanical mixing. The important properties like dielectric permittivity, loss tangent, conductivity, and dielectric heating coefficient were evaluated and compared. It was found that PANI/CR composites had very good dielectric properties in the microwave range. The addition of PANI-N improved the mechanical properties of the composites with reasonably good dielectric properties. The CPCs were also found to have good microwave absorption. © Taylor & Francis Group, LLC. Source

Saritha Chandran A.,Cochin University of Science and Technology | Saritha Chandran A.,St Teresas College | Narayanankutty S.K.,Cochin University of Science and Technology
Polymer - Plastics Technology and Engineering

Natural rubber-Polyaniline (PANI)-Polyaniline coated short nylon-6 fiber (PANI-N6) composites were prepared by mechanical mixing and its cure characteristics, filler dispersion, mechanical properties, conductivity and thermal stability were evaluated. PANI was synthesized by chemical oxidative polymerization of aniline in presence of hydrochloric acid. PANI-N6 was prepared by in situ polymerization of aniline in the presence of short nylon-6 fiber. The composite showed higher tensile strength, tear strength and modulus values and lower elongation at break. The DC electrical conductivity and the thermal stability of the composites increased with PANI and PANI-N6 concentration. The highest conductivity obtained was 1.99×10 -6 S/cm. © Taylor & Francis Group, LLC. Source

Gopinath A.,St Teresas College | Muraleedharan N.S.,Cochin University of Science and Technology | Chandramohanakumar N.,Cochin University of Science and Technology | Jayalakshmi K.V.,National Institute of Oceanography of India
Environmental Forensics

Samples of macro algae collected at random distances from the coral and near shore environment of Lakshadweep archipelago were analyzed for their trace metal content (Fe, Mn, Zn, Cu, Co, Cr, Cd, Pb, and Ni). All the species showed an affinity towards essential elements, and the concentration of Fe seemed to be the highest in all the species, irrespective of their classification. The trace metal content reported in this study was much lower than the limit prescribed by Food and Agricultural Organization (FAO) in seafood for human consumption. None of the species of algae had the tendency to bioconcentrate Pb in their system as the detection level was below 0.1 mg/kg. The metal selectivity index calculated in statistical analysis emphasized the ability of algae to accumulate a particular metal from among the metals studied. To show the similarity between species and metal uptake, a group linkage clustering technique was used and the results were depicted using dendrogram. The marked similarities in the levels of trace metals in algal species have supported the view that all samples originated from a common coastal habitat. This exemplifies the applicability of bio-monitoring studies of marine algae to forensic investigations. © Taylor & Francis Group, LLC. Source

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