Enzyme Immobilzation | Biosensors | Protein & Genetic Engineering| Unit 1 Biotechnology 6th Semester

This extensive lecture covers multiple biotechnology topics in Unit 1. It begins with an introduction to biotechnology, defining it as the use of living organisms through various techniques to develop useful products. The instructor explains enzyme immobilization as a process where enzymes are fixed to solid supports for reuse in industrial processes, using lactose-free milk production as a practical example. Five methods of enzyme immobilization are detailed: adsorption, covalent bonding, entrapment, cross-linking, and encapsulation. The biosensor section uses glucose meters to explain how biological components detect substances and convert them to measurable signals, covering five components: receptor, transducer, amplifier, processor, and display. Different types of biosensors are discussed including calorimetric, potentiometric, acoustic wave, amperometric, and optical. The protein engineering section explains how amino acid sequences in proteins are modified to improve their properties, covering rational design and directed evolution approaches, with techniques like site-directed mutagenesis. The lecture covers microbial production of enzymes including amylase, catalase, peroxidase, lipase, protease, and penicillinase. Finally, genetic engineering basics are introduced, explaining recombinant DNA technology where genes from different organisms are combined to produce desired proteins in large quantities.