Bhumika Jena^a, Swati Sucharita Singh^a, Susanta Kumar Behera^a,b, Smrutirekha Mishra^c, Sankha Chakrabortty^c, Dayanidhi Meher^d, Bansidhar Mulia^d, Suraj K. Tripathy^c, Ramesh Kumar^e, Byong-Hun Jeon^e, Cecilia Stålsby Lundborg^f, Amrita Mishra^a

^aSchool of Biotechnology, Kalinga Institute of Industrial Technology, Bhubaneswar, 751024, India
^bIMGENIX India Pvt. Ltd., Bhubaneswar, 751024, India
^cSchool of Chemical Technology, Kalinga Institute of Industrial Technology, Bhubaneswar, 751024, India
^dKalinga Institute of Medical Sciences, Bhubaneswar, 751024, India
^eDepartment of Earth Resources & Environmental Engineering, Hanyang University, Seoul, 04763, Republic of Korea
^fDepartment of Public Health Sciences, Karolinska Institutet, Stockholm, 17177, Sweden

Corresponding authors: Byong-Hun Jeon, Amrita Mishra

Globally, Methicillin-Resistant Staphylococcus aureus bacteraemia is one of the commonest bloodstream infections associated with clinical complications and high mortality. Thence, devising effective and targeted biogenic silver based strategies are in great demand. However, limited insights regarding the biosynthesis methodologies impedes the possible scale up and commercial potentials. We, hereby demonstrate the biosynthesis of Ag nanoparticles using the phytochemical agent extracted and purified from bulb extract of Urginea indica. The chemical structure of the phytochemical agent is investigated by various chromatographic and spectroscopic techniques and was found closely relatable to N-ethylacetamide. Ag nanoparticles synthesis by this agent was found to have a strong Surface Plasmon band at 402 nm. X-ray diffraction and transmission electron microscopy further validated the formation of Ag nanoparticles with face-centred cubic structure with a size range of 20-30 nm. The biogenic metal nanoparticles have shown potential antibacterial activity against S. aureus and MRSA (within a range of 10-50 μg/mL). The nanoparticles have also shown promising anti-biofim activity against the above mentioned strains. The nanoparticles were expected to induce ROS mediated bactericidal mechamism. Cell viability and in-vitro infection studies advocate noticeable biocompatibility and future clinical potential of the developed nanoparticles against Staphylococcus infections.