Fabrication of silver nanoparticles from marine green algal species: Ulva lactuca L. and Ulva conglobata L. and their antibacterial activity Solanki Anita, Patel Gaurav, Hakim Masuma*, Patel Illa Department of Life Sciences, Hemchandracharya North Gujarat University, Patan-384265, Gujarat, India *Corresponding author e-mail: hakim.masuma1@gmail.com
Online Published on 31 March, 2023. Abstract The field of marine nanobiotechnology is new and exhilarating. Marine environments, which are biologically varied, provide considerable potential for nanoscience and nanotechnology. The present research is concentrated on the phyco-synthesis of silver nanoparticles utilizing the marine green algae Ulva lactuca and Ulva conglobata. The algal-produced particles offer an attractive alternative to conventional methods. The primary confirmation was done through the visual examination of colour transition from yellow-brown to dark brown. The generated particles were characterized through various effective methods, including transmission electron microscopy, Fourier transforms infrared spectroscopy and ultraviolet-visible spectra. The UV-visible spectral analysis showed that U. lactuca and U. conglobata had absorbance peaks at 413 nm and 406 nm, respectively. Fourier Transform Infrared Spectroscopy identified the functional groups of algal extract involved in the stabilization of nanoparticles. The biomolecules of proteins and the phenol compounds responsible for the composition of nanoparticles correlated to the significant spectral peak of infrared spectroscopy. The transmission electron microscopic images displayed the spherical shape and average size at 25–40 nm in U. lactuca and 40–70 nm in U. conglobata generated AgNPs. The nanoparticles showed potential antibacterial activity against all selected microorganisms. The synthesized silver nanoparticles revealed significant antibacterial activity against Escherichia coli in U. lactuca at (22.13±0.70 mm) and in U. conglobata (20.16±0.72 mm) followed by Pseudomonas aeruginosa in U. lactuca (21.83±0.60 mm) and in U. conglobata (19.33±0.88 mm). The study showed that U. lactuca and U. conglobata might be used as alternate sources to create AgNPs without harming plants. The generated AgNPs exhibit potent antibacterial activity against both Gram-positive and Gramnegative bacteria, which can be investigated for the treatment of a number of human disorders. The present work developed an eco-friendly and straightforward approach to extracellular nanoparticle formation. Top Keywords Marine algae, Nanoparticles, Gram-positive, Gram-negative bacteria. Top |