What You Need to Know
Microbial nitrate reductase converts nitrate (NO3−) from celery powder, beet juice, or similar sources into nitrite (NO2−) during low‑temperature curing. The generated nitrite reacts with myoglobin to form the stable pigment nitrosylmyoglobin, giving cured meats their characteristic pink hue, while also inhibiting Clostridium botulinum and other spoilage organisms. Reaction efficiency depends on pH (5.5–6.5), temperature (4–10 °C), and nitrite concentration, requiring precise control to avoid excess nitrosamine formation or insufficient safety.
The Science
Primary Reaction
Nitrate (NO3−) → Nitrite (NO2−) via bacterial nitrate reductase; Nitrite + Myoglobin → Nitrosylmyoglobin (Fe2+–NO) + minor nitrosamine side‑reactions