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Characterization of biogenically synthesized silver nanoparticles for therapeutic applications and enzyme nanocomplex generation

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Abstract

The present study describes green synthesis of silver nanoparticles (AgNPs) and inulin hydrolyzing enzyme nanocomplexes (ENC) using Azadirachta indica (Ai) and Punica granatum (Pg) leaf extracts. Surface topology and physico-chemical characteristics of AgNPs were studied using surface plasmon resonance (SPR), FTIR, SEM, AFM and EDX analyses. Particle size analysis using dynamic light scattering and AFM studies revealed that Ai-AgNPs (76.4 nm) were spherical in shape having central bigger nano-regime with smaller surroundings while Pg-AgNPs (72.1 nm) and ENCs (Inulinase-Pg-AgNPs ~ 145 nm) were spherical particles having smooth surfaces. Pg-AgNPs exhibited significant photocatalysis of a thiazine dye, methylene blue. Both Ai- and Pg-AgNPs showed selective antibacterial action by inhibiting pathogenic Bacillus cereus, while the probiotic Lactobacillus strains remained unaffected. Ai-AgNPs showed potential anti-biofilm effect (30% viability) on B. cereus biofilms. Pg-AgNPs showed anti-cancer effect against human colon cancer cell lines (Caco-2) resulting in 40% cell death in 48 h. Enzymes (inulinase, L-asparaginase and glucose oxidase) were successfully immobilized onto nanoparticles together with the biogenic synthesis of AgNPs and recyclability of the Inulinase-Pg-AgNPs complex was demonstrated. The study elaborates characteristics of green synthesized nanoparticles and their potential applications as anti-cancer, antibacterial and antioxidant nano drugs that could be used in food and nutraceutical industries. Enzyme immobilization on AgNPs without any toxic cross-linker opens up newer possibilites in enzyme-nanocomplex research.

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Acknowledgements

Author RC acknowledges UGC, New Delhi for financial assistance as PhD scholarship. Authors acknowledge the instrumentation facilities (FTIR, SEM-EDX, Zetasizer, AFM, electrochemical workstation) available under Sophisticated Instrumentation Centre (SIC) and Department of Science and Technology, New Delhi PURSE (II) scheme at Dr. Harisingh Gour Vishwavidyalaya, Sagar, India.

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There is no funding provided by any agency to drive this work.

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Contributions

RC and AJ performed characterization experiments. Photocatalytic degradation of MB has been performed by AJ. Rest of all application experiments were performed and data analyzed by RC. NK conceptualized and supervised the work. Writing, review and editing of the manuscript has been done by NK and RC.

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Correspondence to Naveen Kango.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Choukade, R., Jaiswal, A. & Kango, N. Characterization of biogenically synthesized silver nanoparticles for therapeutic applications and enzyme nanocomplex generation. 3 Biotech 10, 462 (2020). https://doi.org/10.1007/s13205-020-02450-8

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  • DOI: https://doi.org/10.1007/s13205-020-02450-8

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