Fluid D is used for diluting or rinsing samples containing lecithin or oil when performing sterility testing.

• Peptone water helps dilute and rinse
• Inclusion of polysorbate 80 acts as a surfactant
• Nontoxic

Fluid D is peptone water with polysorbate 80, and is used for diluting or rinsing when performing sterility testing. This fluid aids in the complete rinsing of the membrane filter apparatus and is not toxic to microorganisms. Fluid D contains polysorbate 80, which acts as a surfactant to break down the lecithin or oils present.