CSIR NET Life Science Exam > CSIR NET Life Science Videos > Crash Course for CSIR NET Life Sciences > Competitive ELISA and Inhibition ELISA
Competitive ELISA and Inhibition ELISA Video Lecture | Crash Course for CSIR NET Life Sciences
FAQs on Competitive ELISA and Inhibition ELISA Video Lecture - Crash Course for CSIR NET Life Sciences
| 1. What is the primary difference between Competitive ELISA and Inhibition ELISA? |  |
Ans. The primary difference lies in the mechanism of detection. In Competitive ELISA, the sample antigen competes with a labeled antigen for a limited number of antibody binding sites. The more antigen present in the sample, the less labeled antigen binds, resulting in a lower signal. In contrast, Inhibition ELISA involves an initial binding of the sample antigen to the antibody, which inhibits the binding of a labeled antigen. The level of inhibition correlates with the amount of antigen in the sample.
| 2. How are the results of Competitive ELISA interpreted? | |
Ans. The results of Competitive ELISA are interpreted based on signal intensity. A lower signal indicates a higher concentration of the target antigen in the sample, as more labeled antigen is displaced by the sample antigen. Calibration curves, generated using known concentrations of the antigen, are often employed to quantify the concentration of the unknown sample by comparing its signal to the standard curve.
| 3. What applications do Competitive ELISA and Inhibition ELISA have in research and diagnostics? | |
Ans. Both assays are widely used in research and clinical diagnostics. Competitive ELISA is commonly employed for measuring small antigens, hormones, or drugs in biological samples, while Inhibition ELISA is often used for detecting larger molecules or in applications where the antigen is present in varying concentrations, such as in immunological studies or environmental monitoring.
| 4. What are the advantages of using Inhibition ELISA over Competitive ELISA? | |
Ans. Inhibition ELISA has several advantages, including its ability to detect larger antigens and its suitability for complex samples where the presence of multiple antigens may interfere. Additionally, Inhibition ELISA can provide higher sensitivity and specificity in certain contexts, as it relies on the direct measurement of the ability of the sample antigen to inhibit the binding, which can reduce background noise.
| 5. What are common challenges encountered when performing Competitive and Inhibition ELISA? | |
Ans. Common challenges include cross-reactivity, where antibodies may bind to non-target antigens leading to false positives or negatives. Additionally, sample matrix effects can alter the assay's accuracy. Proper optimization of conditions, including antibody concentrations and incubation times, is crucial for both methods to ensure reliable results.
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Sep 28, 2025
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