JNTU B.Pharmacy III PHARMACEUTICAL BIOTECHNOLOGY Previous Question Paper (August-2022 - R17)

A biosensor is an analytical device that integrates a biological sensing element with a physical transducer to convert a biological response into a measurable electrical signal. The working principle relies on the specific interaction between an analyte and a bioreceptor, which produces a physicochemical change that is subsequently converted into a quantifiable output.

The working mechanism involves three primary components:

• Bioreceptor: A biological component (such as enzymes, antibodies, nucleic acids, or microorganisms) that selectively recognizes and binds to the specific target analyte.
• Transducer: The component that converts the biological reaction (e.g., heat, pH change, light emission, or electron transfer) into a measurable signal, typically electrical. Common types include electrochemical, optical, piezoelectric, and thermal transducers.
• Signal Processor: The electronic unit that amplifies and processes the signal from the transducer, displaying the results in a user-friendly format.

In the pharmaceutical industry, biosensors are critical for quality control, drug development, and clinical monitoring. Key applications include:

• Drug Discovery and Screening: Biosensors facilitate high-throughput screening of drug candidates by measuring the affinity and kinetics of interactions between potential drugs and target receptors or enzymes.
• Quality Control and Fermentation Monitoring: They are used for real-time monitoring of fermentation processes in the production of antibiotics, vaccines, and recombinant proteins by tracking nutrient levels (glucose, glutamine) and metabolic byproducts.
• Pharmacokinetic Studies: Biosensors allow for the rapid detection and quantification of drug concentrations in biological fluids, aiding in the assessment of drug absorption, distribution, metabolism, and excretion (ADME).
• Detection of Contaminants: They are employed to detect trace amounts of impurities, toxins, or microbial contaminants in pharmaceutical formulations, ensuring product safety and regulatory compliance.
• Clinical Diagnostics: Biosensors are essential for point-of-care testing to monitor patient responses to therapy, such as measuring glucose levels or detecting specific biomarkers indicating disease progression or drug efficacy.