Abstract
The biogenic synthesis of metal nanoparticles (MNPs) through the reduction of metal ions using secondary metabolites extracted from plants is considered an eco-friendly and bio-safe method. In this study, palladium nanoparticles (Pd-NPs) were synthesized through biogenic synthesis. Pd-NPs were obtained using an aqueous leaf extract of Crateva religiosa, exhibiting the desired physicochemical properties in terms of structure, optics, and photocatalytic activity. The characterization of prepared biogenic Pd-NPs was achieved by UV-Vis spectroscopy, FT-IR, XRD, SEM, EDX, and HR-TEM. As a result of characterization, UV-Vis spectrum exhibited a maximum absorbance at a wavelength of 420 nm. In the XRD analysis, five basic peaks attributed to Pd-NPs, and an average crystallite size was 10.31 nm. In addition, SEM and HR-TEM determined that Pd-NPs have a quasi-spherical shape, and an average size of 15–20 nm was tested antimicrobial activity with Bacillus subtilis, Klebsiella pneumonia, Aspergilus niger, and Aspergillus tamarii. Pd-NPs at 30 μg/mL exhibited bacteriocidal and anti-fungistatic activity. In addition, Pd-NPs inhibited the formation of the biofilm layer by B. subtilis and K. pneumoniae by 85.63% and 92.78%, respectively. Pd-NPs also exhibited potential free radical scavenging activity in a dose-dependent manner. Pd-NPs displayed a remarkable anti-inflammatory activity of 96.68% according to the albumin denaturation inhibitory assay. Furthermore, they exhibited anticancer activity against A549 cell lines, with an IC-50 value of 28.25 μg/mL determined through in vitro cytotoxicity assessment using the MTT assay. The photocatalytic activity was observed by the degradation of fast green dye (95.28%) and Rose Bengal dye (95.15%) at pH 3 and 150 min of exposure time and under sunlight. Moreover, the Pd-NPs positively impacted seed germination on horse gram. Overall, the results indicate that Pd-NPs, obtained through biogenic synthesis, have the potential to serve as agents for various biological and environmental applications.
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Acknowledgements
I would like to thank Professor & Head and Faculty Incharge, Department of Botany, Bharathiar University, Coimbatore, India, for providing the FTIR and HPLC facilities under the grant UGC-SAP and The Professor & Head and Faculty Incharge, Department of Physics to provide the HR-TEM and XRD facility under the grant DST-PURSE (Phase-II) at Central Instrumentation Centre, Bharathiar University, Coimbatore, India. I would like to special thank Dr. I. Prabha, Associate Professor, Department of Chemistry, Bharathiar University, Coimbatore, India for their moral support and encouragement.
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Arumugam Vignesh and Thomas Cheeran Amal: conceptualization, data curation, methodology, investigation and writing—original draft. Jayasankar Kalaiyarasan and Subramaniam Selvakumar: formal analysis, Writing—review and editing and validation. Krishnan Vasanth: project administration, writing—review and editing and supervision, reviewing, and editing the manuscript. All authors read and approved the final manuscript. All the data were generated in-house, and no paper mill was used. All authors agree to be accountable for all aspects of work ensuring integrity and accuracy.
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Highlights
• An effective bio-inspired synthesis of Pd-NPs using Crateva religiosa extracts (CRE)
• Pd-NPs’ distinct properties make them highly promising for biomedical use
• Synthesized Pd-NPs help FGD and RBD degradation in industrial effluents
• Pd-NPs positively impacted seed germination applications on horse gram
• This study offers a practical, affordable, and safe approach to producing inorganic NPs
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Vignesh, A., Amal, T.C., Kalaiyarasan, J. et al. An effective bio-inspired synthesis of palladium nanoparticles using Crateva religiosa G.Forst. leaf extract: a multi-functional approach for environmental and biomedical applications. Biomass Conv. Bioref. (2023). https://doi.org/10.1007/s13399-023-05031-w
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DOI: https://doi.org/10.1007/s13399-023-05031-w