Description
Chemicals that prevent bacterial or fungal spoilage have been used for centuries. Students observe the effects of 4 chemical preservatives-sorbic acid, sodium nitrite, sodium benzoate, and propionic acid-on 6 food spoilage microorganisms. Requires 8 days from setup to completion. Keep bacteria and fungi cultures at room temperature; do not incubate or refrigerate. Recommended for students with moderate experience in microbiology. For a class of 30 students. Comes with perishable materials.