Abstract
In this investigation, leaf extracts of Ocimum basilicum and Mangifira indica were used as reducing agents for biosynthesis of silver nanoparticles (AgNPs). The biosynthesized AgNPs were authorized by UV-vis spectrophotometry and X‑ray diffraction (XRD) analysis. AgNPs were obtained after 5 min of reaction at 80oC. The formation of AgNPs was confirmed by the presence of absorption peaks at 439 nm using extract from O. basilicum and at 442.5 nm from M. indica. X‑ray spectra showed strong peaks for the crystalline Ag. Shape and size of the biosynthesized AgNPs were studied using high resolution transmission electron microscope (HR-TEM). Size of the produced AgNPs was found to be 9–35 nm. Effect of the synthesized nanosilver was then investigated on some biochemical attributes of wheat plant (Triticum aestivum cultivar saka 92). The growth parameters such as shoot lengths, fresh and dry weight of shoot, chlorophyll, carbohydrate and protein contents in shoot of wheat plant were investigated. Application of AgNPs synthesized from Ocimum basilicum and from Mangifira indica at the concentrations of 20,40 ppm showed an increase in shoot length, fresh and dry weight of shoot, chlorophyll, total carbohydrate and protein content in shoot of wheat plants, beyond these concentrations an inhibitory effects were shown.
Zusammenfassung
In dieser Untersuchung wurden Blattextrakte von Ocimum basilicum und Mangifira indica als Reduktionsmittel für die Biosynthese von Silber-Nanopartikeln (AgNPs) verwendet. Die biosynthetisierten AgNPs wurden durch UV/Vis-Spektroskopie und Röntgendiffraktionsanalyse verifiziert. Die AgNPs wurden nach 5 Reaktionsminuten bei 80 °C gewonnen. Die Bildung von AgNPs wurde durch das Vorhandensein von Absorptionsspitzen bei 439 nm bei O.-basilicum-Extrakt und bei 442,5 nm bei M.-indica-Extrakt bestätigt. Röntgenspektren zeigten starke Spitzen für das kristalline Ag. Die Form und Größe der biosynthetisierten AgNPs wurden mit hochauflösender Transmissionselektronenmikroskopie (HR-TEM) untersucht. Die Größe der produzierten AgNPs lag bei 9–35 nm. Dann wurde die Auswirkung des synthetisierten Nanosilbers auf bestimmte biochemische Eigenschaften von Weizenpflanzen (Triticum aestivum, Sorte „Saka 92“) analysiert. Wachstumsparameter wie Trieblänge, Frisch- und Trockengewicht der Triebe, Chlorophyll-, Kohlenhydrat- und Proteingehalt von Weizentrieben wurden untersucht. Die Anwendung von AgNPs, synthetisiert mit Ocimum basilicum und Mangifira indica, in Konzentrationen von 20,40 ppm ergab längere Triebe, höheres Frisch- und Trockengewicht der Triebe, einen höheren Chlorophyll-, Gesamtkohlenhydrat- und Proteingehalt der Weizentriebe. Über diese Konzentrationen hinaus wurde eine inhibitorische Wirkung gezeigt.
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Acknowledgements
The authors are thankful to Dr. Mona Mostafa Saif Assistant professor of inorganic chemistry, Faculty of Education, Ain Shams University, for helping us with UV-Vis spectroscopy and FTIR analysis.
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Latif, H.H., Ghareib, M. & Tahon, M.A. Phytosynthesis of Silver Nanoparticles using Leaf Extracts from Ocimum basilicum and Mangifira indica and their Effect on some Biochemical Attributes of Triticum aestivum . Gesunde Pflanzen 69, 39–46 (2017). https://doi.org/10.1007/s10343-017-0385-9
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DOI: https://doi.org/10.1007/s10343-017-0385-9
Keywords
- Green synthesis
- Silver nanoparticles
- TEM (Transmission Electron Microscopy)
- Chlorophyll
- Carbohydrate
- Protein