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Ecotoxicology and environmental safety v.147, 2018년, pp.9 - 16   SCI SCIE
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Revelation of susceptibility differences due to Hg(II) accumulation in Streptococcus pyogenes against CX-AgNPs and Cefixime by atomic force microscopy

Rasheed, Wasia (Corresponding author. ) ; Shah, Muhammad Raza ; Perveen, Samina ; Ahmed, Shakil ; Uzzaman, Sami ;
  • 초록  

    Abstract Solution based method for the formation of chemically modified silver nanoparticles (CX-AgNPs) using Cefixime as stabilizing and reducing agent was developed. The CX-AgNPs were characterized by AFM, UV–visible, FT-IR and MALDI-TOF MS. Bactericidal efficiency of CX-AgNPs and Cefixime against Streptococcus pyogenes was evaluated. Afterwards, susceptibility differences of Streptococcus pyogenes due to accumulation of Hg(II) against CX-AgNPs and Cefixime were estimated and validated through Atomic force microscopy. Selectivity and sensitivity of CX-AgNPs against Hg(II) was evaluated in a systematic manner. The CX-AgNPs was titrated against optically silent Hg(II) which induced enhancement in the SPR band of CX-AgNPs. The increase in intensity of SPR band of CX-AgNPs was determined to be proportionate to the concentration of Hg(II) in the range of 33.3–700μM obeying linear regression equation of y = 0.125x + 8.962 with the detection limit of 0.10μM and the coefficient of determination equals to 0.985 ( n = 3). The association constant Ka of CX-AgNPs-Hg(II) was found to be 386.0095mol −1 dm 3 by using the Benesi Hildebrand plot. Highlights CX-AgNPs exhibit dual functionality, inhibit S. pyogenes and sense Hg(II) selectively. Synthesis of silver nanoparticles stabilized with cefixime. Morphological evaluation of Streptococcus pyogenes byAFM. Optical discrimination of Hg(II) by CX-AgNPs. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Hg(II) accumulation .   Streptococcus pyogenes .   Silver nanoparticles .   Antibiotic.  

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