Microwave Aqueous Dissolution of Potato Starch for the Synthesis of Starch Capped Silver Nanoparticles

Abstract

The synthesis of silver nanoparticles (AgNPs) is widespread nowadays due to their intrinsic properties, from antiseptic, antifungal, anticancer, and also as carriers of bio‐active natural carriers when the synthesis is performed using natural products. Starch is also a widely used capping agent of AgNPs, considering its ideal properties, such as, natural product, environmentally friendly, bio‐compatible, easy to obtain, and low cost. Nevertheless, there are already scientific evidence that the aqueous dissolution of starch granules is different when using conventional heating and microwave heating. In fact, these two different heating processes originate starch molecular structures in water with different physicochemical properties. Hence, the preparation method adopted for starch solutions must influence the synthesized AgNPs capped with starch. In the present work, the dissolution of starch is achieved by microwave and the parameters during the dissolution process are optimized, aiming at the highest absorbance values and lower surface plasmon resonance band of starch capped AgNPs suspensions. The stirring speed, microwave power, temperature, and heating time for the preparation of aqueous solution of potato starch are optimized to high, 300 W, 100 °C, and 2 min in this work.

Minimizing the Silver Free Ion Content in Starch Coated Silver Nanoparticle Suspensions with Exchange Cationic Resins

“…The starch-stabilized AgNPs (starch-AgNPs) were synthesized using a green chemistry approach [49] in a microwave synthesizer to ensure the rigorous control of the irradiation time, the reaction temperature, pressure, power, and stirring. In an aqueous medium, AgNO 3 was used as a precursor, glucose was used as a reductant, and starch was used as a coating and stabilizing agent for the nanoparticles.…”

Antibacterial activity of silver nanoparticle LED-synthesized using Citrus maxima peels

“…Therefore, green synthesis methods utilizing plant extracts have emerged as a promising alternative to address these issues for AgNP synthesis. Biopolymers such as chitosan, starch, and pectin have been utilized for the green synthesis of metallic nanoparticles (Ardjoum et al, 2021;Fonseca & Prior, 2021;Kalaivani et al, 2018;Musino et al, 2021;Pascu et al, 2021;Polinarski et al, 2021;Su et al, 2019). Among those biopolymers, pectin has gained attention due to its biodegradability, nontoxicity, and affordability, making it an attractive option for reducing metallic ions and stabilizing metal nanoparticles (Devendiran et al, 2016;Ivanova et al, 2012;Nemiwal et al, 2021).…”