Uo is the average of the common logarithm of the number of viable bacteria recovered from the control samples (PLA or PHB) immediately after inoculation (validation of recovery efficiency);
Ut is the average of the common logarithm of the number of viable bacteria recovered from the control samples (PLA or PHB) after 24 h (controls of survival in time, without PHMG derivatives);
At is the average of the common logarithm of the number of viable bacteria recovered from the test samples (W-PHB/PLA, APHB/PLA, S-PHB/PLA) after 24 h.
According to standard ISO 22196, the reduction of the number of cells capable of growth by two orders of magnitude (R 2) was
interpreted as a bactericidal effect of the investigated composite.