Synthesis, Characteristation and Biological Activity of Silver Nanoparticles Generated Using the Leaf and Stembark Extract of Combretum erythrophyllum


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Abstract

Background: Medicinal plants are known to contain numerous phytometabolites with suggested pharmacological value. Literature suggests that the medicinal use of phytometabolites in its natural state has limited success due to poor absorption rates. Currently, the focus lies on synthesizing phytometabolites extracted from medicinal plants and silver ions to generate nano-scale carriers with specialized properties. Thus, the nano-synthesis of phytometabolites with silver (Ag+) ions is proposed. The use of silver is promoted due to its known antibacterial and antioxidant effectiveness, among many. Nanotechnology allows for the green generation of nano-scaled particles that are able to penetrate target areas due to its size and unique structure. Therefore, this study aimed to generate a novel protocol for the synthesis of AgNP's using the leaf and stembark extracts of C. erythrophyllum. In addition, the biological activity of the generated nanoparticles was evaluated.

Objectives: To synthesis silver nanoparticles (AgNP's) using the leaf and stembark extracts of Combretum erythrophyllum. The relative shape, size, distribution, and zeta potential of the synthesised particles were characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), Energy-dispersive X-ray (EDX), Nanoparticle tracking analysis (NTA), and UV Spectrophotometry (UV -vis). To screen the synthesised particles for its potential antibacterial, apoptotic and cytotoxic properties

Methods: A novel protocol for the synthesis of silver nanoparticles (AgNP's) using the leaf and stembark extracts of Combretum erythrophyllum was established. The generated AgNP's were characterised using transmission electron microscopy (TEM), scanning electron microscopy (SEM), Energy-dispersive X-ray (EDX), Nanoparticle tracking analysis (NTA), and UV Spectrophotometry (UV -vis). Furthermore, the AgNP's were evaluated for their antibacterial, cytotoxic and apoptotic activity against a range of bacterial strains and cancer cells. Characterisation was based upon particle size, shape and elemental silver composition

Results: Within the stembark extract, synthesised nanoparticles were large, spherical in shape and dense in elemental silver composition. While synthesised nanoparticles of the leaf extract were small to medium in size, varied in shape established and contained minimal quantities of silver (substantiated by the TEM and NTA results). Furthermore, it was established that the synthesized nanoparticles exhibited high antibacterial properties due to the conducted antibacterial assay. The FTIR analysis revealed the presence of numerous functional groups within active compounds found in the synthesised extracts. Functional groups found varied between the leaf and stembark extracts, each with proposed pharmacological activity.

Conclusion: Presently, antibiotic-resistant bacteria are continuously evolving thus, posing as a threat to conventional drug delivery systems. Nanotechnology provides a platform that enables the formulation of a low-toxicity and hypersensitive drug delivery system. Further studies evaluating the biological activity of extracts of C. erythrophyllum synthesized with silver nanoparticles could enhance its proposed pharmaceutical value

About the authors

Sahejna Bantho

School of Life Sciences, University of KwaZulu-Natal

Author for correspondence.
Email: info@benthamscience.net

Yougasphree Naidoo

School of Life Sciences, University of KwaZulu-Natal

Email: info@benthamscience.net

Yaser Dewir

Plant Production Department, King Saud University

Email: info@benthamscience.net

Moganavelli Singh

School of Life Sciences, University of KwaZulu-Natal

Email: info@benthamscience.net

Johnson Lin

School of Life Sciences, University of KwaZulu-Natal

Email: info@benthamscience.net

Ayuvna Bantho

School of Life Sciences, University of KwaZulu-Natal

Email: info@benthamscience.net

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