Peroxidases (EC: 1.11.1.7) are haem proteins and contain iron (III) protoporphyrin IX (ferriprotoporphyrin IX) as the prosthetic group [1]. They are found in all cells and play a critical role in many biological processes, such as the host-defense mechanism [2]. Peroxidases (PODs) are widely used in clinical biochemistry, enzyme immunoassays, synthesis of various aromatic chemicals, treatment of waste water containing phenolic compounds [3, 4]. In this study, peroxidase enzyme was purified with Para amino benzohydrazide (PABH)-L-Tyrosine Sepharose 4B affinity chromatography to investigate the inhibitory effect of hydrazide derivatives on Turnip (Brassica rapa L.). IC50 values and Ki constants were calculated for the molecules of 6-Amino nicotinic hydrazide, 6-Amino-5-bromo nicotinic hydrazide, 2-Amino-5-hydroxy benzohydrazide, 4-Amino-3-hydroxy benzohydrazide on purified enzyme and inhibition type of these molecules were determined.

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