Extracellular Biosynthesis of Copper and Copper Oxide Nanoparticles by Stereum hirsutum, a Native White-Rot Fungus from Chilean Forests

Table 1

Maximum absorbance on plasmon resonance absorption (SPR) of the copper or copper oxide nanoparticles produced at 25°C after 2 and 5 d of reaction: effect of pH and salts (5 mM).

pH	Salts	Absorbance; (2 d) (λ, nm)	Absorbance; (5 d) (λ, nm)
5	CuCl2	0.03 ± 0.004 (670)	0.04 ± 0.005 (670)
	Cu(NO3)2	0.02 ± 0.003 (670)	0.02 ± 0.002 (670)
	CuSO4	0.01 ± 0.003 (670)	0.02 ± 0.003 (670)
7	CuCl2	0.03 ± 0.003 (620)	0.04 ± 0.002 (620)
	Cu(NO3)2	0.04 ± 0.004 (670)	0.04 ± 0.003 (670)
	CuSO4	0.02 ± 0.003 (670)	0.03 ± 0.002 (670)
9	CuCl2	0.03 ± 0.002 (620)	0.06 ± 0.004 (620)
	Cu(NO3)2	0.03 ± 0.003 (670)	0.06 ± 0.004 (670)
	CuSO4	0.02 ± 0.002 (670)	0.04 ± 0.003 (670–710)