As reducing agents

As reducing agents

The plants extracts are mainly used as reducing agents for the synthesis of metal NPs, such as Ag, Au, Cu NPs an etc.. These extracts are not strong reducing agents therefore small NPs are obtained. Some of them are first coordinated to the metal cations to form metal comlex and then reduction of the metal takes place.

That's why no surfactant is needed in these types of syntheses and the methods are considered as green ones.

Mohammad Kooti some plants are rich in polyphenols like Duranta erecta, which reduced the silver solution in few second. what about that ?

Plant act as reducing as well as capping agent

Thanks Muhammad Ismail

The diversity of secondary metabolites (tannin, flavonoids, saponin, steriodsetc) obtained from fresh aqueous extract made it the plant of choice for the reduction of metal ions.

General mechanism

Dear Muhammad, compared to the common rducing agents, such as sodiumborohidride and hydrazine, most of the plant extracts can be considered as weak reducing agents.

Thanks for the valuable information.

Yes ofcourse sir Mohammad Kooti

As a compare to chemical plant is very poor. But some plants give very excellent result.

Thanks Muhammad. How I will select such a plant ?

You can select them from the literature. Usually color fruit plants are very active

Which part of plant will be more active ?

Usually fruit and leaves

You can also use the shoot and root. Some plants like turmeric have active rhizome. So carry a series of experiments on all part

Thanks Muhammad Ismail

A reducing agent as well as a caping agent.

As attached

Thanks

Tahir Saeed Khan