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

Table 1

Total phenolic, flavonoid, naringin, and hesperidin contents of extracts from pomelo peels using different extraction methods¹.

Type of pomelo	Total phenolics (mg GAE/g sample)	Total flavonoids (mg RE/g sample)	Naringin (mg/g sample)	Hesperidin (mg/g sample)
Ultrasound-assisted extraction
Da Xanh	4.93 ± 0.32^e	1.54 ± 0.02^ef	1.09 ± 0.02^c	0.23 ± 0.01^g
Nam Roi	4.08 ± 0.27^g	0.93 ± 0.03^i	0.62 ± 0.02^e	0.13 ± 0.01^i
Tan Trieu	6.87 ± 0.28^b	1.90 ± 0.03^c	0.79 ± 0.02^f	0.49 ± 0.01^d
Enzyme-assisted extraction
Da Xanh	6.70 ± 0.42^b	1.60 ± 0.01^ef	1.10 ± 0.09^c	0.20 ± 0.01^f
Nam Roi	5.65 ± 0.20^e	0.96 ± 0.02^h	0.68 ± 0.04^e	0.14 ± 0.01^h
Tan Trieu	7.38 ± 0.33^b	2.07 ± 0.01^b	0.85 ± 0.06^e	0.54 ± 0.01^c
Ultrasound and enzyme-assisted extraction
Da Xanh	5.76 ± 0.06^d	1.55 ± 0.04^e	1.04 ± 0.09^b	0.27 ± 0.01^ef
Nam Roi	4.33 ± 0.08^f	1.09 ± 0.05^gh	0.89 ± 0.02^de	0.16 ± 0.01^h
Tan Trieu	7.06 ± 0.15^b	2.24 ± 0.05^a	0.87 ± 0.09^de	0.54 ± 0.01^b
Enzyme and ultrasound-assisted extraction
Da Xanh	7.16 ± 0.12^b	1.76 ± 0.06^d	1.15 ± 0.07^a	0.29 ± 0.01^e
Nam Roi	6.03 ± 0.25^c	1.15 ± 0.04^g	1.04 ± 0.01^d	0.16 ± 0.01^g
Tan Trieu	7.50 ± 0.28^a	2.29 ± 0.05^a	0.99 ± 0.01^d	0.59 ± 0.01^a

¹Values followed by the same superscript letters in the same column are not significantly different ().