Optimized Conditions for Flavonoid Extraction from Pomelo Peel Byproducts under Enzyme- and Ultrasound-Assisted Extraction Using Response Surface Methodology

Table 6

Bioactivity properties and flavonoid composition of extracts from different extraction methods^1,2.

Sample	Bioactivity properties			Flavonoid composition
	TFC (mg RE/g db)	TPC (mg GAE/g db)	Antioxidant activity (%)	Naringin (mg/g db)	Hesperidin (mg/g db)
DX-W	10.69 ± 0.07^a	16.79 ± 0.43^a	25.45 ± 0.03^a	6.94 ± 0.13^a	1.26 ± 0.05^a
DX-E	2.42 ± 0.03^b	6.58 ± 0.22^b	22.70 ± 0.04^b	1.24 ± 0.06^b	0.06 ± 0.03^b

¹TFC: total flavonoid content; TPC: total phenolics content; DX-W: pomelo peel extract under the optimal conditions of the enzyme-assisted and ultrasound-assisted extraction; DX-E: pomelo peel extract under the optimal conditions of the ethanol conventional extraction. ²Values (mean ± standard deviation) followed by the different superscript letter are significantly different ().