Feruloyl esterases represent a diverse group of hydrolases catalyzing the cleavage and formation of ester bonds between plant cell wall polysaccharide and phenolic acid. They are widely distributed in plants and microorganisms. Besides lipases, a considerable number of microbial feruloyl esterases have also been discovered and overexpressed. This review summarizes the latest research on their classification, production, and biophysicochemical properties. Special emphasis is given to the importance of that type of enzyme and their related phenolic ferulic acid compound in biotechnological processes, and industrial and medicinal applications.

In this work, formation in the binary and ternary systems of the Fe III metal ion with gallic acid and glycine was investigated by means of potentiometry, conductometry, polarography, and UV-visible absorption spectroscopy techniques at 25 °C and in I ) 0.10 mol • dm -3 NaNO 3 . The protonation equilibria of gallic acid and glycine were investigated and discussed. The acidity constants of gallic acid and glycine were determined and used for determining the stability constants of the binary and ternary complexes formed in the aqueous medium under the experimental conditions. The ternary complex formation was found to occur in a stepwise manner. The stability constants of these binary and ternary systems were calculated. The concentration distribution of the various complex species in solution was evaluated and discussed. The solid binary [Fe III -gallic acid] and ternary [Fe III -gallic acid-glycine] complexes were synthesized and characterized by elemental analysis, FT-IR, 1 H NMR, and 13 C NMR spectroscopy.

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