Spectroscopic synthetic optimizations monitoring of silver nanoparticles formation from Megaphrynium macrostachyum leaf extract

Simple disclosure of plasmon resonance band maxima by ultraviolet spectroscopy coupled to centrifugation, determination of percentage recovery, a case study of Gnetum bucholzianum Engl. leaf mediated silver nanoparticles

“…It can be seen that plasmon absorbance bands increases with increasing pH from 2 to 12, which can be due to the increase in production of colloidal silver nanoparticles and reduction rate. A behavior already obtained in previous reports [23,[25][26][27]. The yellow-brown color of the nanoparticles appeared shortly after mixing the AgNO3 with the extract at pH 8 to 12.…”

“…The visible spectra have been recorded at 1 hour, 24 hours and 96 hours of incubation time in the dark to eliminate silver ions photoactivation. The solution color is changing within minutes to yellow brown due to vibration of plasmons at the colloid surface indicating the formation of silver nanoparticles [25][26][27]. In the range of silver nitrate concentrations and extract quantities, the nanoparticles are not aggregate reflecting the efficiency of the extract molecules to act as protecting capping agents.…”

Natural Substances for the Synthesis of Silver Nanoparticles against Escherichia coli: The Case of Megaphrynium macrostachyum (Marantaceae), Corchorus olitorus (Tiliaceae), Ricinodendron heudelotii (Euphorbiaceae), Gnetum bucholzianum (Gnetaceae), and Ipomoea batatas (Convolvulaceae)

“…Thus, all organic materials were cleaned with running tap water followed by deionized water to remove all the dust and unwanted visible particles. Aqueous plant extracts of dissolved reductants and capping molecules were prepared by boiling 10 g organic material in 200 ml deionized water for 5 min at 80 ∘ C. The method is generally used to synthetize silver nanoparticles and has been retained for this work [7,8,12]. The silver nanoparticles mediated leaves of Megaphrynium macrostachyum, Corchorus olitorus, Gnetum bucholzianum, and Ipomoea batatas and seed kernels of Ricinodendron heudelotii are therefore obtained in the same synthetic conditions.…”

“…They have been selected due to their involvement in food supply. The synthetics optimizations and the suitability of these plants parts to produce silver nanoparticles have been described in our previous reports [7,8,12]. We describe herein the uses of the obtained silver nanoparticles as antimicrobial agent against Escherichia coli.…”

Antimicrobial and Catalytic Activities of Green Synthesized Silver Nanoparticles Using Bay Laurel (<i>Laurus nobilis</i>) Leaves Extract

“…The uses of toxic and hazardous chemicals, in addition to high cost and power consumption are the main drawbacks of methods used in the preparation of silver nanoparticles [4]. AgNPs were synthesized using a variety of plant extracts as reducing and stabilizing agents such as Ziziphus Jujuba leaf [5], Megaphrynium macrostachyum leaf [6], Myrmecodia pendan (Sarang Semut plant) [7], Neem (Azadirachta indica) leaves [8], Bergenia ciliata [9], sulfated polysaccharide extract from Sargassum siliquosum, a brown alga [10], Eucalyptus oleosa [11], Annona squamosa L. [12], Pistacia atlantica [13], Pongamia pinnata [14], the cell free filtrate of marine sediment fungal species from the Southern peninsular coastal region of India [15], isoamyl acetate isolated from Annona squamosa [16], Eucalyptus camaldulensis [17], cellulose extract and sucrose [18], Chomelia asiatica plant leaves [19], aqueous Raphanus sativus root [20], chamomile [21], Commiphora caudata leaves [22], Staphylococcus epidermidis [23], and L-cysteine [24]. Furthermore, extract of Manilkara zapota (L.) seeds [25], Canna edulis Ker-Gawl [26] and aqueous extract of turmeric powder [27] were used to enhance the green synthesis of AgNPs.…”