Organic Matter

chemistry

Biological soil such as blood, food, and body fluids that can reduce disinfectant effectiveness.

Definition

Organic matter refers to biological residues — including blood, mucus, food debris, faeces, and soil — that may be present on surfaces. It can chemically inactivate disinfectants (particularly chlorine-based products) and physically shield microorganisms.

Why it matters

The presence of organic matter is one of the main reasons disinfectants fail in practice; removing it via cleaning is essential to achieve the target log reduction.

Practical applications

Explicitly addressed in cleaning-then-disinfection protocols, spill management procedures, and disinfectant dose selection for heavily soiled areas.

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