Sabyasachi Sarkar (born 17 May 1947) is an Indian chemist. He has worked with functional models related to hyperthermophilic to mesophilic metalloproteins enriching bioinorganic chemistry. A Replica of a Fishy Enzyme and the reduced xanthine oxidase also have been made. Inhibition patterns in the Michaelis complex of low molecular weight hepatic sulfite oxidase model complex have been exhibited. Based on functional mimicking of a series of molybdoenzymes he showed that the even in model enzymatic oxotransfer reactions the participation of similar enzyme-susbrate (E-S) complex is a real entity. Such a chemical spices (E-S) responds to spontaneous intramolecular oxidative addition and reductive elimination to complete the oxotransfer reaction. Such a reaction differs from conventional chemic