Evaluation of the Antimicrobial Activity of Nanostructured Materials of Titanium Dioxide Doped with Silver and/or Copper and Their Effects on Arabidopsis thaliana

Table 2

Determination of copper and silver by atomic absorption spectrophotometry.

	⁢Seedling treated in MS for a week		⁢Seedling treated in H2O for 24 h
NSMs	(Ag) mg/g	(Cu) mg/g	(Ag) mg/g	(Cu) mg/g
Ag@TiO2	0.58 ± 0.03	—	0.23 ± 0.23	—
TiO2-Cu^2+	—	0.29 ± 0.06	—	0.31 ± 0.03
Ag^0	0.2 ± 0.05	—	0.12 ± 0.01	—
Control (−)	0	0.12 ± 0.016	0	0.13 ± 0.01
	⁢MS medium after a week		⁢H2O after a week
NSMs	(Ag) ppm	(Cu) ppm	(Ag) ppm	(Cu) ppm
Ag@TiO2	0.17 ± 0.01	—	0	—
TiO2-Cu^2+	—	3.17 ± 0.148	—	0.08 ± 0.02
Ag^0	0.085 ± 0.03	—	0.47 ± 0.01	—
Control (−)	0	0.11 ± 0.05	0	0.04 ± 0.002
	H2O after 24 h		⁢Phosphate buffer pH 5.7 after 24 h
NSMs	(Ag) ppm	(Cu) ppm	(Ag) ppm	(Cu) ppm
Ag@TiO2	0.06 ± 0.003	—	0.1 ± 0.01	—
TiO2-Cu^2+	—	0.25 ± 0.03	—	0.47 ± 0.07
Ag^0	0.63 ± 0.02	—	0.25 ± 0.02	—
Control (−)	0	0.11 ± 0.05	0	0.03 ± 0.001
	⁢Phosphate buffer pH 7 after 24 h
NSMs	(Ag) ppm	(Cu) ppm
Ag@TiO2	0.16 ± 0.02	—
TiO2-Cu^2+	—	0.5 ± 0.01
Ag^0	0.2 ± 0.04	—
Control (−)	0	0.1 ± 0.03

Seedling treated, exposure medium of seedlings, and exposure medium of microorganisms with 1 mg/mL of Ag@TiO₂, 1 mg/mL of TiO₂-Cu²⁺, and 0.015 mM Ag⁰.