Abstract
Silver nanoparticles (AgNPs), manganese dioxide nanoparticles (MnO2NPs) and silver-doped manganese dioxide nanoparticles (Ag-doped MnO2NPs) were synthesized by simultaneous green chemistry reduction approach. Aqueous extract from the leaves of medicinally important plant Cucurbita pepo was used as reducing and capping agents. Various characterization techniques were carried out to affirm the formation of nanoparticles. HR-TEM analysis confirmed the size of nanoparticles in the range of 15–70 nm and also metal doping was confirmed through XRD and EDS analyses. FT-IR analysis confirmed that the presence of biomolecules in the aqueous leaves extract was responsible for nanoparticles synthesis. Further, the concentration of metals and their doping in the reaction mixture was achieved by ICP–MS. The growth curve and well diffusion study of synthesized nanoparticles were performed against food- and water-borne Gram-positive and Gram-negative bacterial pathogens. The mode of interaction of nanoparticles on bacterial cells was demonstrated through Bio-TEM analysis. Interestingly, AgNPs and Ag-doped MnO2 NPs showed better antibacterial activity against all the tested bacterial pathogens; however, MnO2NPs alone did not show any antibacterial properties. Hence, AgNPs and Ag-doped MnO2 NPs synthesized from aqueous plant leaves extract may have important role in controlling various food spoilage caused by bacteria.
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This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2013R1A1A2007953) and also funds from Chonbuk National University, Republic of Korea.
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Krishnaraj, C., Ji, BJ., Harper, S.L. et al. Plant extract-mediated biogenic synthesis of silver, manganese dioxide, silver-doped manganese dioxide nanoparticles and their antibacterial activity against food- and water-borne pathogens. Bioprocess Biosyst Eng 39, 759–772 (2016). https://doi.org/10.1007/s00449-016-1556-2
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DOI: https://doi.org/10.1007/s00449-016-1556-2