Citrate Test Notes

Citrate Test: Principle

  • The citrate test assesses a microbe's ability to utilize citrate as its sole carbon and energy source.
  • The test relies on the microbe's capacity to generate alkaline byproducts during citrate breakdown.

Citrate Test: Procedure

  • Preparation of Citrate Agar Plate
    • Use aseptic technique to prepare a Simmons citrate agar plate.
  • Inoculation
    • Apply the microbe being tested to the plate using aseptic technique.
  • Incubation
    • Incubate the plate at 3737 °C for 4848 hours.
  • Observation
    • Observe the plate for growth and any color change after incubation.
  • Interpretation
    • Positive Test: A color change from green to deep blue signifies alkaline products and indicates a positive result.
    • Negative Test: No color change (remains green) indicates a negative result.