Zeitschrift für Chromatographie und Trenntechniken
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LC-MS Characterization and Evaluation as Corrosion Inhibitor of the Aqueous Extract of Ziziphus joazeiro Stem Bark

Aparecida Cristina Mauro*

The aqueous Extract of Joazeiro Stem Bark (EJSB) was chemically characterized by Liquid Chromatography-high resolution Mass Spectrometry (LC-MS) and examined as potential corrosion inhibitors of mild steel in 1 mol L^-1 hydrochloric acid media, using weight-loss measurements. The LC-HRMS analysis revealed compounds already present in the Ziziphus joazeiro. The chemical characterization of ECCJ by LC-MS analysis enabled the identification of 18 compounds. Among the compounds detected, saponins were noted as the main constituents that had the specific characteristics needed to adsorb on the metal surface and to form a protective film. Varying the concentration of the inhibitors from 100 mg L^-1 to 800 mg L^-1, the results show an increase in anticorrosive efficiency from 85.4 to 89.8 for EJSB, using the data of the gravimetric essay. Considering that the saponin molecules, the main constituent from jua, are responsible for its inhibitory action.