Gel Manufacturing Department that require mixing and homogenization before final filling or storage.

3. Responsibilities

• Production Chemist: Responsible for carrying out mixing and homogenization as per batch instructions.
• Quality Assurance (QA): Verifies parameters and ensures GMP compliance throughout the process.
• Engineering: Ensures operational readiness and calibration of mixing and homogenizing equipment.

4. Accountability

The Head of Gel Manufacturing shall ensure overall adherence to this SOP and that personnel are adequately trained.

5. Procedure

5.1 Equipment Required

• Stainless steel mixing vessel with anchor or paddle stirrer
• High-shear homogenizer or inline homogenizer
• Temperature and RPM monitoring system
• Thermometer, spatula, pH meter (if required)

5.2 Pre-Operational Checks

1. Ensure all equipment has been cleaned and sanitized as per the cleaning SOP.
2. Verify line clearance from QA for mixing area.
3. Ensure that previous steps (e.g., API addition, pH adjustment) are complete and documented.

5.3 Mixing Procedure

1. Transfer the entire batch of gel base with incorporated APIs into the mixing vessel.
2. Start low-speed stirring (20–30 RPM) to homogenize the bulk.
3. Gradually increase RPM as per BMR instructions (typically 50–100 RPM).
4. Continue mixing for a specified duration (usually 30–60 minutes depending on batch size and viscosity).

5.4 Homogenization

1. Switch to homogenizer setup once preliminary mixing is complete.
2. Use homogenizer at designated speed (e.g., 3000–6000 RPM) for 10–15 minutes or as specified in the BMR.
3. Ensure uniform distribution of active ingredients through sample checks at various locations (top, middle, bottom).

5.5 Process Monitoring

1. Monitor and record temperature throughout the process (target: 25–35°C unless otherwise specified).
2. Observe the consistency, transparency/opacity, and air entrapment visually.
3. Document all operational parameters (RPM, time, temperature) in the batch record.

5.6 Post-Mixing Operations

1. Transfer the bulk gel to a holding vessel or directly to the filling tank as per production plan.
2. Label the vessel with status label including product name, batch number, stage, and date.

5.7 Precautions

• Ensure the homogenizer is not operated in a dry condition.
• Do not exceed recommended RPM and duration to avoid degradation of product.
• Handle all connections and parts of the equipment with sanitized gloves.

6. Abbreviations

• RPM: Revolutions Per Minute
• BMR: Batch Manufacturing Record
• GMP: Good Manufacturing Practices
• QA: Quality Assurance

7. Documents

1. Batch Manufacturing Record – Annexure-1
2. Mixing Equipment Log – Annexure-2
3. Process Observation Sheet – Annexure-3

8. References

• ICH Q8: Pharmaceutical Development
• Schedule M – Good Manufacturing Practices
• Internal SOP for API Addition and Gel Base Preparation

9. SOP Version

Version: 2.0

10. Approval Section

	Prepared By	Checked By	Approved By
Signature
Date
Name
Designation	Jr. Production Chemist	QA Executive	Head – Manufacturing
Department	Gel Manufacturing	Quality Assurance	Manufacturing

11. Annexures

Annexure-1: Batch Manufacturing Record

Log for documenting time, temperature, RPM, and visual characteristics during mixing and homogenization.

Annexure-2: Mixing Equipment Log

Details of equipment calibration, usage duration, and maintenance checks.

Annexure-3: Process Observation Sheet

Record sheet for observations like gel texture, clarity, and uniformity post mixing.

Revision History:

Revision Date	Revision No.	Details	Reason	Approved By
01/05/2022	1.0	Initial Release	New SOP Implementation	QA Head
02/06/2025	2.0	Updated to include inline homogenization protocol	Process Enhancement	QA Head