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

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. The aqueous dissolution of starch granules is different when using conventional heating and microwave heating. The aqueous dissolution of starch is achieved by microwave and the parameters during the dissolution process are optimized. The highest absorbance values and lower surface plasmon resonance band of starch capped silver nanoparticles is studied.