Biotechnology is a science in which living organisms, biological systems or their derivatives are used to make or modify new products or process for any specific purpose. The application of biotechnology in the field of food, agriculture, and pharmaceuticals is wide spread. Biotech pharmaceutical products are prepared at molecular level by modifying living organisms. Protein based therapeutic system is supposed to be the future of pharmaceutical industries. Therapeutic proteins consists post translational modifications such as glycosylation of erythropoietin.