Chemical Composition and Biological Activities of Extracts from Pomelo Peel By-Products under Enzyme and Ultrasound-Assisted Extractions

Table 3

Antimicrobial activities of extracts from pomelo peels using different extraction methods¹.

Type of pomelo	Diameter of inhibition (mm)
	S. aureus	B. cereus	S. typhi	P. aeruginosa
Ultrasound-assisted extraction
Da Xanh	nd	10.7 ± 0.6^a	nd	nd
Nam Roi	nd	nd	nd	nd
Tan Trieu	nd	nd	8.3 ± 0.6^a	nd
Enzyme-assisted extraction
Da Xanh	8.3 ± 0.6^a	10.7 ± 0.6^a	10.7 ± 1.5^b	10.3 ± 0.6^b
Nam Roi	12.3 ± 1.5^c	10.7 ± 0.6^a	10.0 ± 1.0^b	11.0 ± 1.0^bc
Tan Trieu	7.7 ± 0.6^a	10.0 ± 1.0^a	8.3 ± 0.6^a	8.0 ± 1.0^a
Ultrasound and enzyme-assisted extraction
Da Xanh	8.7 ± 0.6^a	11.7 ± 0.6^ab	10.0 ± 2.0^b	10.7 ± 0.6^b
Nam Roi	11.7 ± 1.2^bc	11.3 ± 0.6^ab	9.3 ± 1.2^ab	10.7 ± 1.2^b
Tan Trieu	7.3 ± 0.6^a	11.3 ± 0.6^ab	10.3 ± 1.5^b	9.0 ± 1.0^ab
Enzyme and ultrasound-assisted extraction
Da Xanh	10.7 ± 0.6^b	11.3 ± 0.6^ab	10.0 ± 2.0^b	8.0 ± 1.0^a
Nam Roi	12.3 ± 0.6^c	12.0 ± 0.1^b	11.3 ± 0.6^c	12.3 ± 0.6^c
Tan Trieu	10.7 ± 0.6^b	10.7 ± 0.6^a	10.3 ± 0.6^b	9.3 ± 1.5^ab

nd, not detected. ¹Data (mean ± standard deviation) followed by the same superscript letters in the same column are not significantly different ().