Olive Mill Waste Extracts: Polyphenols Content, Antioxidant, and Antimicrobial Activities

Table 5

Antimicrobial activity of OCE and OWWE.

Test substance (dose/disc)	Inhibition zone (mm)
	Bacteria
	Escherichia coli	Staphylococcus aureus	Streptococcus faecalis
OCE
Plain extract (1.25 mg)	0	13,2 ± 0,4	0
Plain extract (2.50 mg)	0	14,6 ± 0,1	0
Plain extract (5 mg)	11,65 ± 0,75	15,7 ± 0,7	11,1 ± 0,1
Mountainous extract (1.25 mg)	0	0	0
Mountainous extract (2.50 mg)	0	12,7 ± 0,7	0
Mountainous extract (5 mg)	12,65 ± 0,65	15 ± 0,8	0
OWWE
Plain extract (1.25 mg)	0	0	0
Plain extract (2.50 mg)	0	12,7 ± 0,3	0
Plain extract (5 mg)	0	14,55 ± 0,35	0
Mountainous extract (1.25 mg)	0	0	0
Mountainous extract (2.50 mg)	0	0	0
Mountainous extract (5 mg)	11,3 ± 0,3	15,85 ± 0,55	15 ± 0,2
Amoxicillin (25 μg)	0	0	15,45 ± 0,45
Chloramphenicol (30 μg)	28,75 ± 0,55	14,2 ± 0,5	22,3 ± 0,5
Ceftriaxone (30 μg)	19,05 ± 0,45	15,6 ± 0,4	25,8 ± 0,2

Diameter of zone of inhibition (mm) including diameter of 6 mm disc. Results quoted as the average of three readings ± standard deviation. 0 mm indicates no visible zone of inhibition.