ORIGINAL RESEARCH PAPER Biogenically proficient synthesis and characterization of silver nanoparticles employing marine procured fungi Aspergillus brunneoviolaceus along with their antibacterial and antioxidative potency Harsh Mistry . Rashmi Thakor . Chirag Patil . Jitendra Trivedi . Himanshu Bariya Received: 16 July 2020 / Accepted: 14 September 2020 Ó Springer Nature B.V. 2020 Abstract Objectives To assess the extracellular synthesis of silver nanoparticles using marine derived fungi Aspergillus brunneoviolaceus with their antibacterial and antioxidant activities. Results The biosynthesis of silver nanoparticles was estimated by the change in color from light yellow to dark brown within 36 h as the reaction progressed. UV-Visible spectroscopy exhibited its stability at 411 nm; ATR-FTIR spectroscopy depicted the func- tional group responsible for its production; X-Ray Diffraction denoted its crystalline FCC structure resembling the peaks in XRD pattern, corresponding to [111], [200], [220], [311] and [222] planes; TEM imaging revealed its spherical morphology with the particle size ranging from 0.72 to 15.21 nm and Tauc’s plot analysis that disclosed its band gap energy as 2.44 eV that manifested the potential of AgNPs to be semiconductors. The characterization data hence- forth, confirmed the efficient production of silver nanoparticles. The biosynthesized AgNPs expressed strong antibacterial activity against two Gram-positive and three Gram-negative bacteria. They also proved to possess higher antioxidative potentials by showing their potent radical scavenging activity against DPPH (2, 2-diphenyl-1-picrylhydrazyl). Conclusions The study unfolds the prospect for further utilization of this mycogenically synthesized AgNPs as antibacterial, antioxidative and anticancer agents. H. Mistry  R. Thakor  C. Patil  H. Bariya (&) Department of Life sciences, Hemchandracharya North Gujarat University, Patan, Gujarat 384265, India e-mail: hsbariya@ngu.ac.in J. Trivedi Department of Biotechnology, Hemchandracharya North Gujarat University, Patan, Gujarat 384265, India 123 Biotechnol Lett https://doi.org/10.1007/s10529-020-03008-7