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. 2020 Apr 10;25(7):1739. doi: 10.3390/molecules25071739

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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HPLC chromatograms at 280 nm for: polyphenols standard mixture of 10 mg/L (black line), and ultrasound-assisted extracts obtained at lab scale without an ice bath after 60 min of extraction for TN (Touriga Nacional, red line) and TR (Tinta Roriz, green line) vine-cane varieties; (1) gallic acid, (2) protocatechuic acid, (3) (+)-catechin, (4) 4-hydroxyphenilacetic acid, (5) 4-hydroxybenzoic acid, (6) 4-hydroxybenzaldehyde, (7) chlorogenic acid, (8) vanillic acid, (9) caffeic acid, (10) syringic acid, (11) (−)-epicatechin, (12) β-resorcylic acid, (13) p-coumaric acid, (14) ferulic acid, (15) sinapic acid, (16) naringin, (17) rutin, (18) resveratrol, (19) quercetin-3-O-glucopyranoside, (20) phloridzin, (21) cinnamic acid, (22) myricetin, (23) kaempferol-3-O-glucoside, (24) kaempferol-3-O-rutinoside, (25) naringenin, (26) quercetin, (27) phloretin, (28) tiliroside, (29) kaempferol and (30) pinocenbrim.