Table 2 - Antimicrobial effect of polyphenols from apple skins on human bacterial pathogens

Table 2. Effect of the apple skin extracts from Royal Gala and Granny Smith varieties against bacterial pathogens.

Extracts		*E coli*	E coli ATCC25922	E coli ATCC 35218	S. aureus ATCC 25923	S. aureus ATCC 29213	P. aeruginosa ATCC 27853	E. faecalis ATCC 29212	*L. monocytogenes*
*Granny Smith*	A B C	6.0* 2.0 -	7.0 4.0 4.0	7.0 - -	7.0 2.0 -	10.0 3.0 1.0	10 3 4	9 - -	9 3 -
*Royal Gala*	A B C	- - -	4.0 3.0 2.0	- - -	3.0 2.0 1.0	4.0 2 1	4 3 -	4 - -	4 3 -
Inhibition zone average		1.3	4.0	1.2	2.5	3.5	4.0	2.2	3.2
Control (+)		16	20	11	19	18	15	36	34

A: acetone: water: acetic acid, B: ethyl acetate: methanol: water, C: ethanol: water. Control (+): 1 mg/ml Chloramphenicol. Control (-): clarified extracts.
(*) Diameter of inhibition zone in mm. Relative Standard Deviation (RSD) ≤ 0.5 mm.