OICC Press Journal of Nanostructure in Chemistry 2193-8865 8 2 (June 2018) 2018 06 08 Microwave-assisted synthesis of silver nanoparticles and their application in catalytic, antibacterial and antioxidant activities 10.1007/s40097-018-0264-7 EN Kondaiah Seku Department of Chemistry, Shinas College of Technology, Shinas, OM Bhagavanth Reddy Gangapuram Department of Chemistry, Palamuru University, Mahbubnagar, Telangana, IN Babu Pejjai Information Materials Laboratory (IMSL), School of Chemical Engineering, Yeungnam University, Gyeongsam, KR Kishore Kumar Kadimpati Department of Pharmaceutics, Narayana Pharmacy College, Nellore, Andhra Pradesh, IN Narasimha Golla Department of Engineering (Applied Science-Chemistry), Shinas College of Technology, Shinas, OM Journal Article 2018 06 08 Abstract Eco-friendly silver nanoparticles (AgNPs) were synthesized using a carboxymethylated gum kondagogu (CMGK) as capping and reducing agent by microwave irradiation method. Synthesized AgNPs were analyzed by TEM, showed spherical in shape with an average particle size distribution of 9 ± 2 nm. XRD results showed that the cubic-structured AgNPs with crystallite size of 8.6 nm. The synthesized CMGK capped AgNPs was tested for catalytic activity using hexacyanoferrate(III) in the presence of NaBH 4 and the impacts of catalyst dose and temperature were examined. The synthesized AgNPs demonstrated a huge antibacterial action on both Gram-positive and negative groups of microorganisms with inhibition zone of 23, 25 and 28 mm, respectively, for Bacillus subtilis , Bacillus cereus and Escherichia coli , they showed moderate antibacterial action (zone of inhibition 15 mm) with Pseudomonas aeruginosa. In addition, the ability of the AgNPs scavenging activity with different concentrations was studied using the DPPH radical scavenging.