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Greener methods for making silver nanoparticles
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Greener methods for making silver nanoparticles

April 25, 2013
300px-Green_tea_3_appearances
English: The appearance of green tea at three different stages (from left to right): the infused leaves, the dry leaves, and the liquor. This particular green tea is Xu Fu Long Ya, a fine Chinese green tea from Sichuan. This is a representational visual reference of a large percentage of fine Chinese green tea, though there are varieties that can be different. The infusion colour is a result of a 1.5 minute duration, at 1 g of leaves to 100 ml of water at 70°C. (Photo credit: Wikipedia)

Scientists are seeking greener ways to make silver nanoparticles

Already renowned for its beneficial effects on human health, green tea could have a new role — along with other natural plant-based substances — in a healthier, more sustainable production of the most widely used family of nanoparticles, scientists say. Published in ACS Sustainable Chemistry & Engineering, their Perspective article concludes that greener methods for making silver nanoparticles are becoming available.

Rajender Varma, Mallikarjuna Nadagouda and colleagues explain that silver nanoparticles are used in a host of products, especially for their ability to kill bacteria and ward off undesirable odors. Those products include antibacterial socks, undergarments and other clothing. Existing processes for making silver nanoparticles require potentially hazardous substances, use a lot of energy and leave behind undesirable byproducts that require special handling. With production expected to increase, scientists are seeking greener ways to make silver nanoparticles.

The article describes how extracts from plants — such as green tea plants, sunflowers, coffee, fruit and peppers — have emerged as possible substitutes that can replace toxic substances normally used to make the nanoparticles. In addition, extracts from bacteria and fungi, as well as natural polymers, like starches, could serve as substitutes. “These newer techniques for greener AgNP synthesis using biorenewable materials appear promising as they do not have any toxic materials deployed during the production process,” the scientists say.

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