SOP Guide for Pharma

Gel Manufacturing: SOP for Manufacturing Gels with pH-Sensitive Drug Release – V 2.0

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Gel Manufacturing: SOP for Manufacturing Gels with pH-Sensitive Drug Release – V 2.0

Standard Operating Procedure for Preparing Gels with pH-Sensitive Drug Release Mechanism

Department Gel Manufacturing
SOP No. SOP/GM/196/2025
Supersedes SOP/GM/196/2022
Page No. Page 1 of 14
Issue Date 10/06/2025
Effective Date 12/06/2025
Review Date 10/06/2027

1. Purpose

To define the standardized procedure for manufacturing gels that incorporate pH-sensitive drug release technology, ensuring accuracy, reproducibility, and compliance with regulatory standards.

2. Scope

This SOP applies to the formulation, compounding, and filling of gels exhibiting pH-responsive drug release characteristics, specifically within the Gel Manufacturing Department.

3. Responsibilities

  • Formulation Scientist: Designs the pH-responsive gel matrix and approves excipient compatibility.
  • Production Chemist: Ensures strict adherence to process parameters and batch instructions.
  • QA Executive: Verifies in-process controls and reviews batch records.

4. Accountability

Head – Manufacturing is accountable for the overall

implementation, control, and review of the procedure.
See also  Gel Manufacturing: SOP for Sealing Gel Packaging to Prevent Contamination - V 2.0

5. Procedure

5.1 Material and Equipment Preparation

  1. Review the batch manufacturing record (BMR) and pH-specific formulation protocol.
  2. Verify availability and status of all raw materials including polymers like Carbopol, Eudragit, or HPMC derivatives.
  3. Calibrate pH meters and check buffer solutions used in testing.
  4. Clean and prepare mixing vessels, agitators, and filling machines as per SOP/GM/073/2025.

5.2 pH-Sensitive Matrix Formulation

  1. Dissolve polymeric base in purified water under continuous stirring at controlled temperature.
  2. Add pH-sensitive drug compound ensuring full dispersion; use a homogenizer if needed.
  3. Adjust gel viscosity and transparency by titration with acid/base until optimal pH range is achieved (typically pH 5.5–6.8).
  4. Perform in-process pH testing and record results (refer Annexure-2).

5.3 Drug Incorporation and Final Homogenization

  1. Add active pharmaceutical ingredient (API) dissolved or suspended in pre-filtered vehicle.
  2. Mix until uniform distribution is achieved and test for homogeneity (refer Annexure-3).
  3. Add preservatives, stabilizers, or pH indicators if applicable.
See also  Gel Manufacturing: SOP for Ensuring Uniform Distribution of Actives in Gels - V 2.0

5.4 Filling and Packaging

  1. Filter gel through 80–120 mesh if required to ensure consistency.
  2. Transfer into filling machine and fill into laminated or aluminum tubes under controlled conditions.
  3. Seal, crimp, and print batch details. Samples for QC testing must be retained (see Annexure-4).

5.5 In-Process and QC Tests

  • Appearance, pH, viscosity, drug content uniformity, microbial limits, and pH-triggered release profiling.
  • Ensure pH-triggered release profile is verified through in-vitro dissolution studies.

5.6 Documentation

  1. Complete batch manufacturing and control records.
  2. Attach calibration certificates of pH meters and any deviation reports.

6. Abbreviations

  • API: Active Pharmaceutical Ingredient
  • BMR: Batch Manufacturing Record
  • HPMC: Hydroxypropyl Methylcellulose
  • QA: Quality Assurance

7. Documents

  1. Batch Manufacturing Record – Annexure-1
  2. pH Adjustment Log – Annexure-2
  3. Homogeneity Test Record – Annexure-3
  4. Filling Activity Log – Annexure-4
  5. pH-Responsive Drug Release Profile – Annexure-5

8. References

  • ICH Q8: Pharmaceutical Development
  • ICH Q6A: Specifications – Test Procedures and Acceptance Criteria
  • Schedule M: Good Manufacturing Practices
See also  Gel Manufacturing: SOP for Cleaning Filling Machines Post Gel Filling - V 2.0

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

Batch No. Product Name Date Formulator QA Reviewer

Annexure-2: pH Adjustment Log

Time Observed pH Adjusted To Base/Acid Used Done By

Annexure-3: Homogeneity Test Record

Sample Point Drug Content (%) Standard Range Result Checked By
Top ±5%
Middle
Bottom

Annexure-4: Filling Activity Log

Filling Line No. Date Operator Yield (%) Remarks

Annexure-5: pH-Responsive Drug Release Profile

pH Time (min) % Drug Released Acceptance Criteria QC Signature
4.5 60 <10%
6.8 60 >85%

Revision History

Revision Date Revision No. Change Description Reason Approved By
01/06/2022 1.0 Initial issue New product line QA Head
10/06/2025 2.0 Revised with enhanced pH release testing Annual revision QA Head
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