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HPLC-DAD identification of compounds in corrosion inhibitor Salix alba bark extract and the hydrolate
(University of Belgrade - Technical Faculty in Bor, 2025) Zdravković, Milica; Savić Jovanović, Slađana; Grekulović, Vesna; Stanković, Dalibor
The compounds present in Salix alba bark (SAB) extract and its hydrolate were identified using highperformance liquid chromatography with diode array detection (HPLC-DAD). SAB extract and its hydrolate were obtained by evaporating a macerate of dried, ground white willow bark and hot distilled water. A total of 19 standard polyphenolic compounds were used for the HPLC analysis. Results indicate that only 4-hydroxybenzoic acid (4-HBA) was detected in the SAB hydrolate. In contrast, both gallic acid and caffeic acid were present in the SAB extract. The presence of 4-HBA indicates the potential possibility of using SAB hydrolate as a starting component for the synthesis of parabens and other 4-HBA derivatives. Additionally, the identification of gallic and caffeic acids in the SAB extract further confirms the effect as a cathodic inhibitor of copper corrosion in chloride environments, because both acids are proven cathodic inhibitors of copper in different corrosion environments.