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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/038/06/1665-1671

    • Keywords

       

      Silver sulphide; biomimetic; pepsin; nanocrystals.

    • Abstract

       

      A simple protein-assisted method was reported to synthesize pepsin-conjugated Ag2S nanocrystals in aqueous solution. The morphology, composition and structure of the products were characterized by transmission electron microscopy, high-resolution transmission electron microscopy, energy-dispersive spectroscopy, selected area electron diffraction and X-ray diffraction measurements. The results showed that as-prepared monoclinic Ag2S nanocrystals are worm-like nanochains in shape with sizes about 25 nm in diameter and up to hundreds of nanometres in length. The multiple coordinate bonds of pepsin molecules to the surface of Ag2S nanocrystals make as-prepared samples have good colloidal stability and biocompatibility as elucidated by Fourier transform infrared examination. Thermogravimetry–differential scanning calorimetry analysis indicated that the obtained products are inorganic–organic nanocomposites and there is strong interaction between Ag2S and pepsin. This interaction could result in the change of hydrophilic environment of pepsin and consequently intrinsic fluorescence of protein was quenched by Ag2S nanocrystals. Furthermore, the nanochains assembly of particle–particle and rod–rod oriented attachment was discussed to investigate the growth mechanism.

    • Author Affiliations

       

      Dezhi Qin1 Li Zhang1 Xian Du1 Guangrui Yang2 Qiuxia Zhang1

      1. College of Chemistry and Chemical Engineering, Pingdingshan University, Pingdingshan 467000, China
      2. Instituteof Environmental and Municipal Engineering, North China University of Water Conservancy and Electric Power, Zhengzhou 450011, China
    • Dates

       
  • Bulletin of Materials Science | News

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