Unexplored vegetal green synthesis of silver nanoparticles: A preliminary study with Corchorus olitorus Linn and Ipomea batatas (L.) Lam

Abstract

Antibacterial properties of silver ion are known from ancient times. The plant extract mediated synthesis of nanoparticles is gaining popularity due to green chemistry for the generation of nanosized materials. Corchorus olitorus Linn and Ipomea batatas (L.) Lam are world crops having leaves of high nutritional value. In the present work, Ag and AgCl nanoparticles were synthesized by incubating leaf aqueous extracts with silver nitrate salt, making them to react in the dark. Plasmon resonance bands, studied by ultraviolet spectroscopy, have been obtained. X-ray diffraction (XRD) revealed the average size of pure crystallites composed of Ag and AgCl. Optimization studies for the synthesis process highlight positive impact of pH, reaction time and reactants quantities.

<p>Comparative study on antidiabetic, cytotoxicity, antioxidant and antibacterial properties of biosynthesized silver nanoparticles using outer peels of two varieties of <em>Ipomoea batatas</em> (L.) Lam</p>

“…39 Besides, it is also reported to be utilized as an anti-asthmatic, antidiabetic, antitumor, anti-inflammatory and anti-microbial agent. 14,40,41 A number of essential primary metabolites such as organic acids, amino acids, sugars, sugar alcohols and health beneficial phytochemicals including phenolic acids, flavonoids, anthocyanins and carotenoids and hydrophilic primary metabolites were identified in various Ib varieties. 13,17,42 Due to its health benefits, IIb is considered a functional food.…”

“…According to the FT-IR analysis, it is probable that the peaks at 3321. 40 (Ib2) indicate the presence of O-H stretch, H-bonded bonds, which belong to the alcohols, phenols functional group. 61,62 The peaks at 1620.66 (Ib1) and 1630.42 cm −1 (Ib2) specify the presence of N-H bend and it belongs to the functional group 1°amines.…”

Green Synthesis of Ag Nanoparticles Using Grape Stalk Waste Extract for the Modification of Screen-Printed Electrodes

“…The nanoparticles suspension obtained from rinsing the pellet up to three times with Milli-Q water, showed maximum absorbance at around 450 nm, indicating the presence of Ag nanoparticles. It has been reported that silver colloids exhibit maximum absorbance within the range 400-500 nm due to Surface Plasmon Resonance (SPR) [26][27][28].…”

“…The wavelength of the band Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 22 October 2018 doi:10.20944/preprints201810.0482.v1Peer-reviewed version available at Nanomaterials 2018, 8, 946; doi:10.3390/nano8110946 of shifted to 470 nm when the reaction pH was 4 and 6. The shift towards large wavelengths(red shift)indicates an increase in the mean diameter of Ag-NPs[25,26].The high band observed at 440 nm seems indicate a great number of Ag-NPs. Additionally, the shift towards lower wavelengths indicates a decrease in the mean diameter of Ag NPs[25,26].…”

“…The shift towards large wavelengths(red shift)indicates an increase in the mean diameter of Ag-NPs[25,26].The high band observed at 440 nm seems indicate a great number of Ag-NPs. Additionally, the shift towards lower wavelengths indicates a decrease in the mean diameter of Ag NPs[25,26]. Thus, SPR seems indicate a great number of smaller diameter Ag-NPs when synthesis takes place at pH 8.Nevertheless, the additional peak observed at 415 nm indicates the presence of other compounds in solution that could affect Ag-NPs quality.Effect of contact timeInorder to ascertain the time required for the completion of the reduction reaction, several tubes containing 4 mL of extract and 6 mL of 0.01 mol L -1 AgNO3 were heated at 80 o C. The tubes were removed from the thermostatic bath at different times ranging from 5 min to 8 h. The UV-Vis spectra of Ag-NPs solution obtained at different reaction times are depicted in Figure 3B.…”