Fbiological Calculator for Moist Heat Sterilization

Calculate biological lethality (Fbio in minutes at 121°C) for overkill (heat-stable products) or product-specific (heat-sensitive) approaches. Based on SAL ≤10^-6.

For heat-stable products. Assumes worst-case bioburden (10^6 spores, D121=1 min). Targets ≥12-log reduction of BI (e.g., Geobacillus stearothermophilus, 10^6 CFU, D121 ≥1.5 min). Minimum Fbio ≥18 min. Validation: Half-cycle (6-log BI kill), full cycle doubles for 12-log.

D-value of BI at 121°C (DT, minutes) i

Range: 1.0–2.5

Enter D between 1.0 and 2.5 minutes.

Log Reduction (LR) i

Minimum: 12

Enter LR ≥ 12.

Explanation

Formula: Fbio = DT × LR

Validation notes: Half-cycle validation demonstrates ≥6-log BI kill; doubling exposure time for the full cycle achieves ≥12-log reduction.

USP <1229.2>Ph.Eur. 5.1.1EMA GuidelinePDA TR1

For heat-sensitive products (bioburden/BI method). Requires bioburden knowledge (count and resistance). Targets SAL ≤10^-6 with typically lower Fbio (e.g., 4–8 min). Routine bioburden monitoring and characterization are needed.

D-value at 121°C (D121, minutes) i

Range: 0.1–1.0

Enter D between 0.1 and 1.0 minutes.

Initial Bioburden per Unit (A or N0, CFU/unit) i

Range: 1–1,000

Enter an integer A between 1 and 1,000 CFU/unit.

Desired Final Population (B or NF) i

Default: 1e-6

Enter a positive number (e.g., 1e-6).

Explanation

Formula: Fbio = D121 × (log10(A) − log10(B))

Notes: Characterize bioburden resistance (e.g., heat screening at 100°C) and correlate with BI performance; implement routine monitoring and trending.

USP <1229.2>Ph.Eur. 5.1.1EMA GuidelinePDA TR1

Fbiological Calculation for Terminal Moist Heat Process

Fbiological Calculator for Moist Heat Sterilization

Explanation

Explanation

Regulatory Emphasis: US vs EU

Comments

Leave a Reply Cancel reply

Subsribe To Our Newsletter

Address

Email Us

Our Main Services

Follow Us