African Journal of Traditional, Complementary and Alternative Medicines
African Ethnomedicines Network
Vol. 12, No. 6, 2015, pp. 33-38
Bioline Code: tc15112
Full paper language: English
Document type: Research Article
Document available free of charge
African Journal of Traditional, Complementary and Alternative Medicines, Vol. 12, No. 6, 2015, pp. 33-38
© Copyright 2015 - African Journal of Traditional, Complementary and Alternative Medicines
GREEN SYNTHESIS OF NANO-SILVER PARTICLES FROM LEAF AND STEM EXTRACTS OF IBOZA ( TETRADENIA RIPARIA)|
Shaik, Shakira; Mkize, Lwamkelekile; Khumalo, Mthokozisi & Singh, Nisha
Background: Secondary metabolites derived from plant extracts can be used in the reduction of metal salts into their respective nanoparticles using
simple, environmentally friendly and cost effective green synthesis techniques. Metal nanoparticles have important applications in medicine and
agriculture. The leaves of
Tetradenia riparia (Iboza), an important medicinal species in South Africa, are reported to contain various terpenoids and
pyrones which can be used in the reduction of silver nitrate (AgNO3) to nano-silver particles.
Materials and Methods: Fresh leaves and stems of Iboza were oven-dried, crushed, extracted in water and methanol and filtered followed by
incubation with AgNO3. Synthesized nano-silver particles were characterised using ultraviolet visible (UV-Vis) spectroscopy, scanning electron
microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy and Fourier transform infrared (FTIR) spectroscopy.
Results: The bio-reduction of metal ion to base metal was rapidly conducted in a single step and at room temperature and pressure. UV-Vis spectra
showed the characteristic surface plasmon resonance band of the synthesized nano-silver particles at 410 nm for all extracts. SEM analysis revealed
predominantly aggregated spherically-shaped nano-silver particles with a size range of 20-50 nm and an average diameter of 26 nm. The presence of
elemental silver in the nanoparticles was confirmed by EDX at 3 keV. As revealed by FTIR analysis, the reducing agents included terpenoids and
pyrones which were responsible for reducing and capping the nano-silver particles.
Conclusion: Both methanol and aqueous-derived extracts of Iboza leaves and stems can be used to synthesize nano-silver particles. FTIR evidence
suggests that the reduction of the silver ions and the synthesis of the nanoparticles may have been actioned by various terpenoid and pyrone
compounds found in the plant parts.
Tetradenia riparia; plant extracts; UV spectroscopy; SEM; EDX; FTIR
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