• S SUMATHI

      Articles written in Bulletin of Materials Science

    • Antimicrobial and larvicidal activity of zinc-substituted hydroxyapatite

      N VALARMATHI K SABAREESWARI S SUMATHI

      More Details Abstract Fulltext PDF

      Mosquitoes transmit serious human infections and cause a number of deaths in tropical and subtropical environment countries every year. In the present work the zinc-substituted hydroxyapatite Ca$_{5-x}$Zn$_x$(PO$_4$)$_3$OH ($x = 0,0.05, 0.2$ and $1.0$) was synthesized by two different methods: the hydrothermal method and the sol–gel method. The phase formation, functional group and surface morphology of Zn-HAP were authenticated using X-ray diffraction, Fourier transform infrared and scanning electron microscopy-energy-dispersive X-ray spectroscopy, respectively. The antimicrobial activity of the synthesized compounds was tested against different organisms such as Escherichia coli, Staphylococcus aureus and Candida albicans. Moreover, excellent antimicrobial activity was observed for hydrothermal synthesized (Zn-HAP) compound compared to that of the sol–gel method. The synthesized Zn-HAP nanoparticles were reported for larvicidal activity against the filarial and Japanese encephalitis vector, Culex quinquefasciatus. The hydrothermal-synthesized (1.0 M Zn-HAP) compound exhibited higher larvicidal activity ($93 \pm 6.62$) with minimumlethal concentration LC$_{50}$ (33.74 mg ml$^{-1}$) (to kill 50% of the care for larvae of the relevant species) and LC$_{90}$ (139.92 mg ml$^{-1}$) (to kill 90% of the treated larvae of the respective species) after 24 h, respectively than that of the sol–gel method.

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      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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