TABLE 2.
Logarithmic decreases and resulting antimicrobial activity in monospecies and mixed biofilms of C. parapsilosis and S. aureus strains after using the four selected sanitizers.
| Treatment | Log10 CFU/mL ± SD
a
obtained after exposure |
Reduction factor | Antimicrobial activity | |||
|---|---|---|---|---|---|---|
| S. aureus | C. parapsilosis | S. aureus | C. parapsilosis | S. aureus | C. parapsilosis | |
| Monospecies biofilms | ||||||
| CLX b (0.5%) | 1.14 ± 0.23 | 0.67 ± 0.08 | 8.03 | 9.1 | Bactericidal g | Fungicidal g |
| PVP-I c (10%) | 4.75 ± 0.04 | 1.59 ± 0.37 | 4.42 | 8.18 | Bactericidal | Fungicidal |
| ADBAC d (0.08%) with ABAC e (0.02%) | 6.48 ± 0.15 | 1.69 ± 0.03 | 2.69 | 8.08 | Bacteriostatic | Fungicidal |
| OPA f (0.55%) | 5.90 ± 0.59 | 0.53 ± 0.13 | 3.27 | 8.94 | Bacteriostatic | Fungicidal |
| Mixed biofilms | ||||||
| CLX a (0.5%) | 0.60 ± 0.11 | 1.25 ± 0.02 | 7.12 | 5.35 | Bactericidal | Fungicidal |
| PVP-I b (10%) | 3.55 ± 0.02 | 2.56 ± 0.01 | 4.17 | 4.04 | Bactericidal | Fungicidal |
| ADBAC c (0.08%) plus ABAC e (0.02%) | 5.52 ± 0.02 | 2.21 ± 0.03 | 2.20 | 4.39 | Bacteriostatic | Fungicidal |
| OPA f (0.55%) | 4.48 ± 0.11 | 2.55 ± 0.09 | 3.24 | 4.05 | Bacteriostatic | Fungicidal |
a
SD, standard deviation.
b
CLX, chlorhexidine gluconate.
c
PVP-I, polyvinyl pyrrolidone.
d
ADBAC, alkyl dimethyl benzyl ammonium chloride.
e
ABAC, alkyl benzyl ammonium chloride.
f
OPA, D-orthophthalaldehyde.
g
Adopted criterion BS EN 13697:2015 + A1:2019.