🌡️ BioFlo Sterilization & Lethality ($F_0$) Calculator

Model autoclave, fermentor media batch sterilization, and steam-in-place (SIP) cycles using microbial death kinetics ($\nabla = \ln(N_0/N_t)$), equivalent sterilization minutes ($F_0 = \int 10^{\frac{T - 121.1}{z}} dt$), and Geobacillus stearothermophilus $D_{121}$ benchmarks.

Autoclave / SIP Thermal Cycle

Holding Temperature T (°C)

Hold Duration (minutes)

Media Batch Volume (L)

Initial Bioburden N₀ (spores/mL)

Target Spore Heat Resistance (Reference Kinetics)

Reference D₁₂₁ Value (min) G. stearothermophilus spores: D₁₂₁ ~ 1.5–2.0 min

Thermal z-value (°C) Standard steam sterilization z = 10.0 °C

Target Sterility Assurance Level (SAL / Contamination Risk)

Calculated Thermal Inactivation & Lethality ($F_0$)

20.0 min

Lethality Value (F₀ at 121.1°C)

30.7

Del Factor Achieved (∇)

25.3

Required Del Factor (∇_req)

4.5 × 10⁻⁶

Vessel Contamination Risk

Log Reduction Delivered: 13.3-log reduction of heat-resistant spores

Compliance Verdict: ✓ Cycle Exceeds Target Sterility Assurance