Table 3.

Effect of biosurfactants as capping agents in the synthesis of nanoparticles.

Metallic Nanoparticle	Capping agent (Biosurfactant)	Size	References
Silver	Rhamnolipid	1 nm	[120]
		166 nm	[132]
		20 nm	[133]
	Lipopeptide	44–70 nm	[134]
		3–30 nm	[135]
		21 nm	[136]
	Surfactin	17.8 ± 9.8 nm	[137]
Zinc sulphide	Rhamnolipid	10–15 nm	[138]
Zinc oxide	Rhamnolipid	6 nm	[139]
Iron	Rhamnolipid	23 nm	[140]
		38 nm	[141]
	Surfactin	8 nm	[142]
	Sophorolipid	100 nm	[143]
Gold	Lipopeptide	58.4 nm	[123]
		40–60 nm	[144]
Copper	Rhamnolipid	0.25 nm	[145]
Nickel	Rhamnolipid	11.6 to 47 ± 5 nm	[146]