Characterization of Exopolysaccharide Produced by Pseudomonas sp. PFAB4 for Synthesis of EPS-Coated AgNPs with Antimicrobial Properties

  • Aparna Banerjee
  • Debasis Das
  • Shalini Gaur Rudra
  • Koushik Mazumder
  • Rodrigo Andler
  • Rajib BandopadhyayEmail author
Original paper


Thermal ecosystems like hot springs are exclusive habitat of thermotolerant microorganisms that produce exopolysaccharides (EPS). In this study, EPS produced by a hot spring origin Pseudomonas species is structurally elucidated.The EPS is highly thermostable (Td 289.98 °C), has low molecular weight (1510 Da) and is rhamnoglucose type consisting α-(1 → 3) linked to L-Rhap and α-(1 → 6) linked to d-Glc substituted with O-acetyl groups. Irregular EPS sheets with smooth surface were observed that signify the compact structure of the biopolymer; a characteristic plasticized film-like feature. Intra- and inter-molecular aggregation of EPS units are observed in atomic force microscopy. The EPS showed good rheological property at neutral pH. EPS-mediated green synthesis of silver nanoparticles (AgNP) was performed using co-precipitation method. Size of individual AgNPs had a Z-average of 93.6 nm and 0.437 polydispersity index. The EPS-coated AgNPs were moderately monodisperse. These AgNPs also exhibited biocidal property preferentially against gram negative bacteria and some fungi. Incorporating EPS to the metal nanoparticles confers them biocompatibility. Green synthesis of silver nanoparticles has gained considerable attention for its eco-friendliness in nano-medicine and nano-biotechnology. Keeping in context, the results of our study will support a new polysaccharide-mediated green synthesis approach of metal nanoparticles that shows profound antimicrobial property.


Pseudomonas Exopolysaccharide Silver nanoparticle Green synthesis Biocidal property 



The authors would like to thank the UGC-Center of Advanced Study, Department of Botany, The University of Burdwan for pursuing the research activities. AB is thankful for the financial assistance from the SRF (State Funded) [Fc (Sc.) /RS/SF/BOT./2014–15/ 103 (3)]. All the authors would also like to thank Dr. Raja Shunmugam, IISER Kolkata for helping in the advanced polymer chromatographic facility.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

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Supplementary file4 (DOCX 12 kb)


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.UGC-Center of Advanced Study, Department of BotanyThe University of BurdwanBurdwanIndia
  2. 2.Centro de investigación en Estudios Avanzados del Maule (CIEAM), Vicerrectoría de Investigación Y PosgradoUniversidad Católica del MauleTalcaChile
  3. 3.Department of ChemistryThe University of BurdwanBurdwanIndia
  4. 4.Division of Food Science and Postharvest TechnologyICAR-Indian Agricultural Research Institute, PusaNew DelhiIndia
  5. 5.Food and Nutritional Biotechnology Division, National Agri-Food Biotechnology Institute (NABI)Department of Biotechnology, Ministry of Science and Technology, Govt of IndiaMohaliIndia
  6. 6.Facultad de Ciencias Agrarias Y ForestalesUniversidad Católica del MauleTalcaChile

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