TABLE 2.

Pearson coefficient calculated for the relationship between MDA values and the antioxidant activity of Porphyridium cruentum biomass, depending on the age at which the culture comes into contact with the nanoparticles (lag phase and exponential growth phase) (Duration of the cultivation cycle 14 days).

Growth phase in which the NPs were added	Correlation coefficient value
	AgNP 10 nm	AgNP 20 nm	AuNP 10 nm	AuNP 20 nm
Lag growth phase	−0.98424	−0.88383	−0.92451	−0.97555
Exponential growth phase	0.845999	0.941365	0.741151	0.874284