Table 3.

Main flavonoid content in grapevine leaf extracts (RGL) obtained by both ultrasound-assisted extraction (UAE) and Naviglio extraction (NAV).

Extract	Caftaric acid	Quercetin-3-O-glucuronide and Quercetin-3-O-glucopyranoside	Q-3-O-rutinoside	k-3-O-glucoside	k-3-O-rutinoside
	mg/g extract ± SD	mg/g extract ± SD	mg/g extract ± SD	mg/g extract ± SD	mg/g extract ± SD
RGL UAE	5.35 ± 0.46	36.53 ± 0.87	1.41 ± 0.11	2.32 ± 0.13	1.41 ± 0.23
RGL NAV	2.68 ± 0.23	47.21 ± 0.45	2.75 ± 0.05	5.26 ± 0.03	2.96 ± 0.06

Q-3-O-rutinoside: quercetin-3-O-rutinoside; k-3-O-glucoside: kaempferol-3-O-glucoside; k-3-O-rutinoside: kaempferol-3-O-rutinoside.