Assessment of Antioxidant and Antimicrobial Property of Polyphenol-Rich Chitosan-Pineapple Peel Film

Table 4

Zone of inhibition of pineapple peel extracts against bacterial organisms.

Bacterial strain	Zone of inhibition (mm)
	PME		PEE
	75 mg/ml	40 mg/ml	75 mg/ml	40 mg/ml
E. coli	16 ± 3.4^b	14 ± 1.0^a	21 ± 1.0^b	16 ± 1.7^b
S. typhimurium	16 ± 1.5^b	10 ± 0.5^a	17 ± 1.0^b	10 ± 1.5^a
B. cereus	12 ± 0.0^a	10 ± 1.0^a	15 ± 1.5^b	11 ± 0.5^a
S. aureus	11 ± 1.0^a	ND	11 ± 1.5^a	ND

All values are expressed as mg/g means ± standard deviation (n = 3). Alphabetic letters indicate the significant difference within a column using a one-way analysis of variance (ANOVA).