Table 1.

Diameters expressed in mm of growth inhibition zone of the bis-pyridinium quaternary ammonium salts (bis-PyQAs) 4a–d and 5a–d. Values are presented as the mean ± SEM. The diameter of the test paper discs is 19 mm.

MO	4a	4b	4c	4d	5a	5b	5c	5d	H2O
B. subtilis	35.00 ± 0.57	30.33 ± 0.33	19.16 ± 0.16	40.83 ± 0.44	41.33 ± 0.33	45.00 ± 0.57	19.83 ± 0.44	25.33 ± 0.33	0
B cereus	41.66 ± 0.33	43.00 ± 0.57	19.33 ± 0.33	37.33 ± 0.33	35.50 ± 0.28	50.50 ± 0.28	19.50 ± 0.28	21.16 ± 0.16	0
S. lutea	22.33 ± 0.33	19.50 ± 0.28	41.00 ± 0.57	19.50 ± 0.28	46.00 ± 0.57	45.33 ± 0.33	21.50 ± 0.28	41.50 ± 0.28	0
S. cerevisiae	22.00 ± 0.57	22.66 ± 0.66	19.66 ± 0.66	19.16 ± 0.16	19.50 ± 0.28	23.16 ± 0.16	19.33 ± 0.16	19.33 ± 0.33	0
C. utilis	22.66 ± 0.66	22.50 ± 0.28	19.33 ± 0.33	19.33 ± 0.33	19.16 ± 0.16	22.66 ± 0.66	19.33 ± 0.33	19.16 ± 0.16	0
R. glutinis	40.33 ± 0.33	35.33 ± 0.33	19.50 ± 0.28	19.83 ± 0.44	19.66 ± 0.33	53.50 ± 0.28	19.50 ± 0.28	19.50 ± 0.50	0
A. niger	19.66 ± 0.66	19.33 ± 0.33	19.83 ± 0.44	19.33 ± 0.33	19.33 ± 0.33	32.33 ± 0.33	19.33 ± 0.33	19.16 ± 0.16	0
P. roqueforti	19.50 ± 0.28	19.16 ± 0.16	19.16 ± 0.16	19.16 ± 0.16	19.16 ± 0.16	19.16 ± 0.16	19.16 ± 0.16	19.50 ± 0.28	0
G. candidum	20.00 ± 0.57	21.66 ± 0.66	19.33 ± 0.33	19.33 ± 0.16	19.33 ± 0.33	33.16 ± 0.16	19.16 ± 0.16	19.33 ± 0.33	0