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PDE AND CLEANING VALIDATION

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Cleaning validation is the methodology used to demonstrate in a reproducible manner that after adequate cleaning, a plant or equipment does not contain substances or materials that could compromise the quality of the subsequent product manufactured in the same plant. This is crucial for patient safety, as residues can pose severe health risks. Thus, cleaning validation is one of the essential regulatory requirement in the good manufacturing practices (GMP) and it is a requirement in different sectors, especially within pharmaceutical and food industry. The cleaning validation is a critical element especially in the GMP of shared facilities. Successful cleaning validation begins with identifying potential residues and establishing acceptable carry-over limits, based on a thorough toxicological assessment using PDE (Permitted Daily Exposure) values or ADI (Acceptable Daily Intake) of the critical substance. We do offer:

    • Toxicological evaluation of Active Pharmaceutical Ingredients (API), food ingredients and / or chemicals, to derive the health-based exposure limits. the PDE or the ADI, according to guideline from authorities (EMA/CHMP/CVMP/SWP/169430/2012) and or working groups (Cefic) These limits must be set by a qualified individual with expertise in toxicology and pharmacology. According to the ASTM standard, the process to establish a Health-Based Exposure Limit (HBEL) is intricate, requiring not only experience but also qualifications from a certified expert (e.g., DABT or ERT).

 

    • Support the scientific selection of the most critical substance, in case the cleaning validation is based on the “worst-case scenario” approach. This requires a matrix to compare all products based on parameters that influence cleanliness, including:
      – Batch size: Larger batch sizes, which soil the equipment’s surface more extensively, should be prioritized.
      – Concentration of active ingredient: Higher concentrations increase the likelihood of residues remaining on equipment surfaces.
      – Solubility of the active ingredient (mg/mL): Greater solubility facilitates easier cleaning.
      – Toxicity: The worst-case scenario would involve the product with the lowest PDE (Permissible Daily Exposure) value.
      – Minimum therapeutic dose: The most potent contaminant should be considered the worst case.

 

    • Support in the calculation of the MACO

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