Standard Operating Procedure for Cross-Contamination Control in Bioreactor Operations for Biosimilars

Department	Biosimilars
SOP No.	SOP/BS/092/2025
Supersedes	SOP/BS/092/2022
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 systematic measures for controlling cross-contamination in bioreactor operations during biosimilar manufacturing. The SOP ensures implementation of controls to avoid cross-mixing of products, microbial ingress, or carryover of residues between batches or processes.

2. Scope

This SOP is applicable to all operations involving equipment, raw materials, personnel, and utilities within bioreactor suites at biosimilar manufacturing facilities.

3. Responsibilities

• Manufacturing Staff: Follow hygiene, gowning, and material segregation procedures strictly.
• QA Personnel: Monitor environmental control records and verify cleaning validations.
• Engineering Team: Maintain integrity of HVAC systems and verify equipment CIP/SIP performance.

4. Accountability

The Head of Manufacturing is accountable for ensuring cross-contamination control is implemented, monitored, and continually improved through risk assessment and training.

5. Procedure

5.1 Facility and Zonal Segregation

1. Ensure bioreactor operations are performed in dedicated cleanroom zones with restricted access.
2. Follow unidirectional flow of personnel and materials.
3. Label equipment and areas as per product campaign or batch ID.

5.2 Equipment Cleaning and Validation

1. Use validated cleaning procedures (refer SOP/BS/098/2025) post each batch.
2. Visually inspect all contact surfaces for residue.
3. Conduct swab/Rinse Test with LOD ≤10 ppm for previous product or protein.
4. Document in Annexure-1: Equipment Cleaning Log.

5.3 Product and Material Segregation

1. Segregate raw materials by product and lot using dedicated containers and color-coded labels.
2. Do not store different in-process materials together in common tanks.
3. Transport intermediates in sealed, pre-sterilized containers.

5.4 Personnel Practices

1. Ensure operators working on a specific product do not move to other zones without complete gown change and sanitization.
2. Train personnel on risks of cross-contamination and proper gowning behavior.

5.5 Environmental Controls

1. Maintain differential pressure between rooms (+10 to +15 Pa) to prevent cross-airflow.
2. Verify HEPA filters monthly and HVAC status before batch start.
3. Perform routine environmental monitoring (settle plate, swab) and trending.

5.6 Changeover Between Products

1. Execute full cleaning, disinfection, and verification as per product changeover matrix.
2. Approve changeover activities through QA and retain approval in Annexure-2.

6. Abbreviations

• HVAC: Heating Ventilation and Air Conditioning
• CIP: Clean-In-Place
• SIP: Sterilize-In-Place
• QA: Quality Assurance

7. Documents

1. Equipment Cleaning Log – Annexure-1
2. Product Changeover Approval Form – Annexure-2

8. References

• ICH Q9 – Quality Risk Management
• WHO TRS 1010 Annex 4 – Cross Contamination and Mix-ups Prevention

9. SOP Version

Version: 2.0

10. Approval Section

	Prepared By	Checked By	Approved By
Signature
Date
Name
Designation
Department

11. Annexures

Annexure-1: Equipment Cleaning Log

Date	Equipment ID	Product	Cleaning Performed By	Swab Results	QA Reviewed
04/05/2025	BR-104	Rituximab	Sunita Reddy	Pass	Yes

Annexure-2: Product Changeover Approval Form

Previous Product	Next Product	Cleaning Completed On	Verified By (QA)	Changeover Approved
Etanercept	Adalimumab	03/05/2025	Rajesh Kumar	Yes

Revision History:

Revision Date	Revision No.	Revision Details	Reason for Revision	Approved By
04/05/2025	2.0	Included changeover approval and HVAC differential pressure control	GMP upgrade