BacterialEndotoxinsRecombinantQualityChecker

Bacterial Endotoxins Recombinant Quality Checker — Control of Bacterial Endotoxins (Recombinant Method)

ℹ️  Utility checks bacterial endotoxin content using recombinant Factor C (rFC) according to Ph. Eur. 2.6.32 and USP <85>:
     • Endotoxin Concentration (EU/mL) — main safety parameter
     • Spike Recovery: 50–200% — confirmation of no interference
     • Precision (CV): ≤ 25% for replicates
     • Negative Control check
     • Alternative to traditional LAL test (crab-free)

⚠️  CRITICAL: If Spike Recovery is outside 50-200%, the test is considered INVALID!
     This indicates that product components inhibit or enhance rFC enzyme activity.

Usage:
  BacterialEndotoxinsRecombinantQualityChecker.exe                            → demo mode (console output)
  BacterialEndotoxinsRecombinantQualityChecker.exe input.csv output.json      → evaluate your data

Input format:
BatchNumber,ProductName,EndotoxinConcentration_EU_ml,DilutionFactor,RecoveryPercent,CV_Percent,NC_Fluorescence,PC_Fluorescence,MethodType

Example:
  BET-rFC-2026-001,mAb Solution,0.05,10.0,95.0,3.5,120.0,5000.0,Kinetic

— WHY IS THIS NEEDED?
Bacterial endotoxins (lipopolysaccharides of Gram-negative bacteria) cause pyrogenic reactions in patients.
The recombinant method (rFC) is a modern, ethical, and highly specific alternative to the Limulus Amebocyte Lysate (LAL) test.
It uses synthetic substrate and recombinant enzyme, ensuring better reproducibility and absence of biological raw material batch variability.

⚠️  CRITICAL:
• Endotoxin Limit (K): Calculated as K/M (where M is maximum drug dose per kg body weight per hour).
• Method Validation: Inhibition/Enhancement test is mandatory for each new product.
• Dilution: If interference is detected, the sample must be diluted until recovery is 50-200%, but endotoxin concentration remains detectable above LOD.
• Specificity: rFC is specific only to endotoxins (unlike LAL, which may react with (1→3)-β-D-glucans).

Key features:
• Endotoxin limit compliance assessment
• Strict system validity control (Recovery, CV)
• Support for kinetic and endpoint assays
• Generation of reports for regulatory dossiers and LIMS LabWare
• Compliance with GMP and Pharmacopoeia requirements (Ph. Eur. 2.6.32)

Critical parameters:
• Endotoxin: ≤ specified limit (e.g., 0.25 EU/mL)
• Recovery: 50 – 200%
• CV (Precision): ≤ 25%
• Negative Control: Below cutoff threshold

💡 Usage tips:
1. Glassware Preparation: All glassware must be depyrogenated (baked at 250°C for at least 30 minutes).
2. Water: Use Endotoxin-Free Water for Injection (WFI) (<0.03 EU/mL).
3. Mixing: Thoroughly mix sample before adding rFC reagent, but avoid foaming.
4. Interpretation: If recovery <50%, inhibition is possible (try increasing dilution or adjusting pH). If >200%, contamination or enhancement is possible.
5. rFC Advantages: Fewer false positives from glucans, higher sensitivity, reagent stability.

⚠️ Note: Recombinant method is becoming the new industry standard due to its supply chain resilience and ethical purity (animal-free).