Preface: This work is entitled: studies on enzymes of medicinal plants was under taken as Ph.D project under the guidance of Prof.T.Ramana, Department of Biochemistry, Andhra University, India. Wide therapeutic applications of different enzymes and their influence on various metabolic processes prompted us in studying certain enzyme activities in different medicinal plants. Acknowledgement: I have immense pleasure in expressing my sincere gratitude and profound sense of indebtness to my teacher and research supervisor Prof.T.Ramana, Department of Biochemistry, Andhra University, for suggesting the problem, able guidance and meticulously assessing the progress of the work at every stage.