Table 2.

Antibacterial activity (inhibition zone and MIC mg/mL, respectively) of mastic extracts before and after liposome encapsulation.

Mastic Extract	Liposome Type	S. aureus	S. epidermidis	P. aeruginosa	E. cloacae	K. pnaumioniae	E. coli
Total mastic gum		22/0.04	20/0.05	17/0.21	15/0.25	13/0.34	18/0.18
Free AMGE		17/0.19	16/0.20	14/0.27	13/0.38	11/0.47	15/0.25
Free NMGE		14/0.45	13/0.52	12/0.73	11/0.88	10/1.0	12/0.64
Liposome + AMGE	EI	12/0.67	12/0.74	10/0.94	9/1.32	8/1.77	9/1.53
Liposome + NMGE	EI	10/1.38	10/1.50	9/1.71	9/1.94	8/1.98	8/1.94
Netilmicin		23/4 × 10−3	23/4 × 10−3	20/8.8 × 10−3	21/8 × 10−3	21/8 × 10−3	19/10 × 10−3
Amoxicillin		25/2 × 10−3	24/2 × 10−3	22/2.4 × 10−3	21/2.2 × 10−3	20/2.8 × 10−3	24/2 × 10−3

AMGE: acidic mastic gum extract; NMGE: neutral mastic gum extract.