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Table 1 Chemicals information

From: Supercritical fluid extraction of polyphenols from lees: overall extraction curve, kinetic data and composition of the extracts

Chemical Supplier
Acetic acid, ethanol (99.5 %) Ecibra (Sao Paulo, Brazil)
Hexane Synth (Diadema, Brazil)
Chloroform, ethyl acetate, silica plates Merck (Darmstadt, Germany)
2-Aminoethyl-diphenylborinate (NP), 2,2-diphenyl-1-picrylhydrazyl (DPPH), p-anisaldehyde Sigma Aldrich (Saint Louis, USA)
Standards (purity >90 %): gallic acid protocatechuic acid, p-hydroxybenzoic acid, syringic acid, p-coumaric acid, ferulic acid, quercetin, rutin, catechin, resveratrol
HPLC grade: acetonitrile, methanol Tedia (Rio de Janeiro, Brazil)