Standard Operating Procedure for Media Hold Time Validation in Bioreactor Operations for Biosimilars
| Department | Biosimilars |
|---|---|
| SOP No. | SOP/BS/099/2025 |
| Supersedes | SOP/BS/099/2022 |
| Page No. | Page 1 of 11 |
| Issue Date | 04/05/2025 |
| Effective Date | 06/05/2025 |
| Review Date | 04/05/2026 |
1. Purpose
To define the procedure for validating the acceptable hold time of cell culture media prior to inoculation in bioreactor operations, ensuring the media retains its sterility and nutrient composition throughout the defined period.
2. Scope
This SOP applies to all chemically defined and complex cell culture media used in upstream biosimilar manufacturing processes at small, pilot, and commercial scale.
3. Responsibilities
- Production: Prepare and store media under defined conditions; coordinate sampling.
- Quality Control: Conduct sterility, pH, osmolality, and nutrient composition testing.
- QA: Review hold time protocol and approve validation reports.
4. Accountability
The Head of Quality Assurance is accountable for ensuring all media hold time validations are performed and documented as per regulatory and internal requirements.
5. Procedure
5.1 Media Preparation and Storage
- Prepare media as per batch manufacturing record (BMR) using WFI and raw materials of approved quality.
- Filter sterilize through a 0.22 μm membrane and collect in pre-sterilized containers or bioreactor vessel.
- Store media under defined conditions (2–8°C for refrigerated hold or 20–25°C for ambient hold).
5.2 Hold Time Study Design
- Design study with multiple time points, e.g., 0h, 24h, 48h, 72h, and 96h.
- At each interval, collect samples for:
- Sterility testing
- pH and osmolality
- Glucose, amino acids, and other critical nutrients
5.3 Acceptance Criteria
- Sterility: No growth observed over 14 days incubation.
- pH: ±0.2 units from initial value.
- Osmolality: Within ±5% of target value.
- Nutrient retention: ≥95% of initial concentration.
5.4 Documentation
- Log all time points and test results in Annexure-1: Media Hold Validation Log.
- Attach QC reports and Certificate of Analysis (CoA) of media batch used.
- Compile results into a final validation summary (Annexure-2).
5.5 Revalidation Criteria
- Revalidate media hold time upon:
- Change in media formulation or supplier
- Change in storage container or conditions
- Periodic validation review (annually)
6. Abbreviations
- WFI: Water for Injection
- QA: Quality Assurance
- QC: Quality Control
- CoA: Certificate of Analysis
7. Documents
- Media Hold Validation Log – Annexure-1
- Validation Summary Report – Annexure-2
8. References
- ICH Q8 – Pharmaceutical Development
- WHO TRS 999 – Annex 2, GMP for Biological Products
9. SOP Version
Version: 2.0
10. Approval Section
| Prepared By | Checked By | Approved By | |
|---|---|---|---|
| Signature | |||
| Date | |||
| Name | |||
| Designation | |||
| Department |
11. Annexures
Annexure-1: Media Hold Validation Log
| Time Point | pH | Osmolality (mOsm/kg) | Sterility | Nutrient Recovery (%) | Tested By |
|---|---|---|---|---|---|
| 0h | 7.2 | 290 | No growth | 100% | Sunita Reddy |
| 72h | 7.1 | 288 | No growth | 97% | Sunita Reddy |
Annexure-2: Validation Summary Report
This section contains the compiled results, observations, graphs, and a conclusion confirming acceptable hold time duration with no significant deviations from defined parameters.
Revision History:
| Revision Date | Revision No. | Revision Details | Reason for Revision | Approved By |
|---|---|---|---|---|
| 04/05/2025 | 2.0 | Updated with nutrient recovery and revalidation criteria | Periodic review and regulatory alignment |