Q: Can you explain your experience with ELISA and FRET assays, and how you have implemented these techniques in your past projects?
A: I have extensive experience with both ELISA and FRET assays. In my previous role, I developed an ELISA protocol to quantify protein concentrations in serum samples. I optimized the assay by adjusting the antibody concentrations and incubation times, which improved the sensitivity by 30%. For FRET, I used it to study protein-protein interactions in cell culture, adjusting the donor and acceptor pairings based on the application. This hands-on experience has enabled me to troubleshoot issues effectively and ensure reliable results.
Q: Describe a situation where you had to adhere to GMP regulations during your work. How did you ensure compliance?
A: In my previous position at a pharmaceutical company, I was responsible for preparing protocols and documentation for experiments that required strict adherence to GMP regulations. I ensured compliance by conducting regular training sessions with my team on best practices and keeping detailed records of all protocols and results. During an internal audit, I successfully demonstrated our efforts in maintaining traceability and integrity, which resulted in positive feedback from the auditors.
Q: Can you discuss your technical writing experience? How do you approach documenting scientific protocols or results?
A: Technical writing has been a significant part of my previous roles. I approach documentation by creating clear and concise standard operating procedures (SOPs) that include objectives, materials, methods, and expected results. For instance, when writing a protocol for a new bioassay, I made sure to include detailed steps accompanied by diagrams for clarity. Additionally, I prioritize accuracy and consistency, performing peer reviews to catch errors and ensure comprehension among users.
Q: What strategies do you use when conducting cell culture experiments, and how do you prevent contamination?
A: When conducting cell culture experiments, I follow strict aseptic techniques and ensure that all equipment and materials are sterilized before use. I work in a biosafety cabinet and wear appropriate personal protective equipment. To prevent contamination, I regularly monitor the culture environment, keeping logs of media changes and cell viability. In instance of unexpected contamination, I promptly identify and isolate affected cultures to prevent it from spreading to others.
Q: Could you provide an example of a challenging potency assay you handled? What steps did you take to validate the results?
A: I once worked on a potency assay for a therapeutic antibody where initial tests showed significant variability in results. To tackle this, I re-evaluated the assay parameters, including reagent quality and equipment calibration. I also performed a thorough statistical analysis of the results to identify outliers. By implementing a more controlled experimental design and repeating the assays, I was able to improve consistency and ultimately ensure accurate potency measurements, which were crucial for our regulatory submissions.