Reagents needed for cultivation of in vitro cultures, e.g., MS and SH basal media, agar, PGRs, and sucrose were acquired from Duchefa Farma B.V. (Haarlem, The Netherlands).
Ultrapure water was obtained using Millipore Milli-Q system (Merck Millipore, Molsheim, France). Acetonitrile and methanol were purchased from Thermo Fisher Scientific (Illkirch-Graffenstaden, France). Standard compounds L-leucine, L-isoleucine, L-phenylalanine, L-tyrosine, L-tryptophan, L-proline, citric acid, gallic acid, coutaric acid, trans-resveratrol, cis-resveratrol, E-piceid, catechin, epicatechin, catechin gallate, tyrosinase, and L-DOPA were purchased from Sigma-Aldrich (St. Louis, MO, USA). Rhamnetin, E-ε-viniferin, quercetin 3-O-glucoside, quercetin 3-O-glucuronide, quercetin-3-O-galactoside, procyanidin B1, procyanidin B2, procyanidin B3, and procyanidin C1 were obtained from ExtraSynthèse (Genay, France); caftaric acid was delivered by Carbosynth (Compton, Berkshire, UK), while E-ε-viniferin, Z/E-vitisin B, ampelopsin A, and hopeaphenol were obtained by previous extraction from grape stems [50 (link)].
Ultrapure water was obtained using Millipore Milli-Q system (Merck Millipore, Molsheim, France). Acetonitrile and methanol were purchased from Thermo Fisher Scientific (Illkirch-Graffenstaden, France). Standard compounds L-leucine, L-isoleucine, L-phenylalanine, L-tyrosine, L-tryptophan, L-proline, citric acid, gallic acid, coutaric acid, trans-resveratrol, cis-resveratrol, E-piceid, catechin, epicatechin, catechin gallate, tyrosinase, and L-DOPA were purchased from Sigma-Aldrich (St. Louis, MO, USA). Rhamnetin, E-ε-viniferin, quercetin 3-O-glucoside, quercetin 3-O-glucuronide, quercetin-3-O-galactoside, procyanidin B1, procyanidin B2, procyanidin B3, and procyanidin C1 were obtained from ExtraSynthèse (Genay, France); caftaric acid was delivered by Carbosynth (Compton, Berkshire, UK), while E-ε-viniferin, Z/E-vitisin B, ampelopsin A, and hopeaphenol were obtained by previous extraction from grape stems [50 (link)].