Characterization and chromium biosorption potential of extruded polymeric substances from Synechococcus mundulus induced by acute dose of gamma irradiation

  • Mervat H. Hussein
  • Ragaa A. Hamouda
  • Abdel Monsef A. Elhadary
  • Muhammad A. Abuelmagd
  • Shafaqat Ali
  • Muhammad RizwanEmail author
Research Article


This study characterized the extruded polymeric substances (EPS) secreted from Synechococcus mundulus cultures under the effect of 2-KGy gamma irradiation dose. The EPS demonstrated seven monosaccharides, two uronic acids and several chemical functional groups: O–H, N–H, =C–H, C=C, C=O, COO–, O–SO3, C–O–C and a newly formed peak at 1593 cm−1 (secondary imide). The roughness of EPS was 96.71 nm and only 28.4% total loss in weight was observed at 800 °C with a high degree of crystallinity quantified as CIDSC (0.722) and CIXRD (0.718). Preliminary comparative analyses of EPS exhibited high protein content in the radiologically modified (R-EPS) than control (C-EPS). Modified EPS were characterized with a high biosorption efficiency, which could be attributed to its high content of uronic acids, protein and sulphates as well as various saccharide monomers. Data revealed that 0.0213 mg L−1 h−1 is the maximum biosorption rate (SBRmax) of Cr(VI) for R-EPS, whereas 0.0204 mg L−1 h−1 SBRmax for the C-EPS respectively.


Synechococcus mundulus Gamma irradiation Exopolysaccharides AFM TGA DSC XRD Cr biosorption Modified bio-sorbent 


Funding information

This study was supported by the Genetic Engineering and Biotechnology Research Institute, University of Sadat City, Sadat City, Egypt


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© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Botany, Faculty of ScienceMansoura UniversityMansouraEgypt
  2. 2.Department of Biology, Faculty of Sciences and Arts KhulaisUniversity of JeddahJeddahSaudi Arabia
  3. 3.Department of Microbial Biotechnology, Genetic Engineering and Biotechnology Research InstituteUniversity of Sadat CitySadat CityEgypt
  4. 4.Biological Application Department, Nuclear Research CenterAtomic Energy AuthorityCairoEgypt
  5. 5.Department of Environmental Sciences and EngineeringGovernment College UniversityFaisalabadPakistan

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