Protolichesterinic Acid: A Prominent Broad Spectrum Antimicrobial Compound from the Lichen Usnea albopunctata

Table 1

Antibacterial activity of protolichesterinic acid.

Test bacteria	Protolichesterinic acid			Ciprofloxacin
	MIC; (μg/mL)	MBC; (μg/mL)	Diameter of zone of inhibition (mm)	MIC; (μg/mL)	MIC; (μg/mL)	Diameter of zone of inhibition (mm)
B. subtilis	32	64	22	2	2	30
B. cereus	64	64	21	1	2	31
S. aureus	2	4	29	1	2	33
MR-S. aureus	16	32	25	4	4	28
S. epidermis	64	128	20	2	4	30
S. simulans	—	—	—	4	4	29
E. coli	8	8	30	1	2	27
P. mirabilis	8	8	30	0.5	1	29
P. vulgaris	2	4	31	2	4	30
V. cholerae	0.5	1	32	2	4	31
K. pneumonia	0.25	0.25	32	1	2	25
P. aeruginosa	64	128	26	2	4	27
S. typhi	4	8	27	4	4	29

—: no activity.