Polyphenols from Sage Leaves (Salvia officinalis L.)Dent, Maja (Avtor) Fuchs-Godec, Regina (Avtor) Pedisić, Sandra (Avtor) Grbin, Dorotea (Avtor) Dragović-Uzelac, Verica (Avtor) Ježek, Damir (Avtor) Bosiljkov, Tomislav (Avtor) high hydrostatic pressure extractioncorrosion inhibitorsagerosmarinic acidpolyphenolsDue to the diversity of organic molecular structures present in sage extract, sage extract is a promising potential source of a cheap and effective biodegradable green corrosion inhibitor for tinplate in 3% NaCl solution, which was evaluated in this study. HHP proved to be a new and emerging technology for the useful extraction of polyphenols from sage as a functional ingredient from natural sources. Analysis of variance among all tested independent factors (ethanol concentration, HHP parameters and temperature) revealed significant differences (p < 0.05) in total polyphenol content as well as for rosmarinic acid as the major phenolic compound in sage extract, while extraction time had no effect (p ˃ 0.05). The optimum HHP conditions (600 MPa, 30% ethanol, 60 °C and 5 min) gave a maximum extraction yield of total polyphenols of 3811.84 mg/100 g. Sage-leaf extracts were found to be a mixture of phenolic acids, namely rosmarinic and salvianolic acid K, epicatechin and luteolin-7-O-glucuronide glycoside. The corrosion results show that the sage extract at a concentration of 0.6 g/L in 3% NaCl is an effective corrosion inhibitor (93%), forming a passivation layer of sage extract consisting of organic compounds such as polyphenols on the surface of tinplate.MDPI20242026-01-28 08:13:48Članek v reviji96768sl© 2024 by the authors