ELISA : The Wonder Tool

 “ELISA: Unlocking the Secrets of Molecular Detection”

Introduction:

Want to detect a hormone in nanogram quantities or screen blood for antibodies? ELISA (Enzyme-Linked Immunosorbent Assay) is your go-to lab tool.

🔬 How ELISA Works :

  1. Coating: The well is coated with antigen or antibody.
  2. Blocking: Prevents nonspecific binding.
  3. Sample Addition: Contains the complementary antibody or antigen.
  4. Secondary Antibody (Linked with Enzyme): Binds to primary antibody.
  5. Substrate Addition: Enzyme converts it to a color signal.
  6. Measurement: Color intensity measured by a spectrophotometer.

Types of ELISA

  • Direct ELISA – Single labeled antibody detects antigen.
  • Indirect ELISA – Uses primary + labeled secondary antibody.
  • Sandwich ELISA – Highly specific; uses antibody pairs.
  • Competitive ELISA – Signal decreases with increasing target concentration.

🌐 Where It Shines

  • Diagnosing infections like HIV, Hepatitis
  • Pregnancy tests (detecting hCG)
  • Food allergen detection
  • Monitoring vaccine efficacy

Analogy:

It’s like a highly specific key-in-lock system that glows when the right match is found—giving both identification and quantity in one shot.


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