SOP Guide for Pharma

Gel Manufacturing: SOP for Development of Oil-Based Gels – V 2.0

Auditor

Gel Manufacturing: SOP for Development of Oil-Based Gels – V 2.0

Standard Operating Procedure for Developing Oil-Based Gel Formulations in Gel Manufacturing

Department Gel Manufacturing
SOP No. SOP/GM/168/2025
Supersedes SOP/GM/168/2022
Page No. Page 1 of 10
Issue Date 09/06/2025
Effective Date 11/06/2025
Review Date 09/06/2027

1. Purpose

To establish a systematic procedure for developing and formulating oil-based gel products, ensuring optimal consistency, stability, and therapeutic effectiveness.

2. Scope

This SOP applies to formulation development teams, R&D departments, and manufacturing personnel involved in creating oil-based gels for pharmaceutical, cosmetic, and cosmeceutical applications.

3. Responsibilities

  • Formulation Development Team: Responsible for the design, evaluation, and documentation of oil-based gel formulations.
  • R&D Chemist: To conduct pre-formulation studies, compatibility assessments, and stability testing.
  • Quality Assurance (QA): To ensure compliance of the formulation process with regulatory and quality standards.
See also  Gel Manufacturing: SOP for Production of Thermosensitive Gels - V 2.0

4. Accountability

Head – Gel Manufacturing

and Head – Quality Assurance are accountable for implementation and adherence to this SOP.

5. Procedure

5.1 Selection of Oil Phase

  1. Select suitable oils (e.g., light liquid paraffin, isopropyl myristate, caprylic/capric triglycerides) based on:
    • Solubility of active pharmaceutical ingredients (APIs)
    • Spreadability and skin feel
    • Stability and oxidation resistance

5.2 Selection of Gelling Agent

  1. Identify suitable lipophilic gelling agents such as:
    • Colloidal silica
    • Hydrogenated castor oil derivatives
    • Aluminum/magnesium stearates
  2. Evaluate compatibility with oil base and API.

5.3 Pre-formulation Studies

  1. Conduct solubility studies for API in selected oil.
  2. Evaluate rheology, pH, and spreadability of oil-gel base without API.
  3. Perform accelerated stability testing at 40°C and 75% RH.

5.4 Manufacturing Process Development

  1. Weigh and mix oils under a nitrogen blanket to prevent oxidation if required.
  2. Disperse the gelling agent into the oil with continuous stirring using high-shear mixers.
  3. Incorporate the API, solubilized in oil (if applicable), under controlled mixing.
  4. Homogenize until a uniform gel structure is achieved.
See also  Gel Manufacturing: SOP for Accelerated Stability Studies for Prototype Gels - V 2.0

5.5 Evaluation of Formulation

  1. Test key parameters:
    • Viscosity
    • Homogeneity
    • pH
    • Appearance (clarity/opacity)
    • Drug content uniformity
  2. Check for any phase separation or oil exudation after centrifugation.

5.6 Documentation

  1. Record experimental design and trial batches in the Formulation Development Record – Annexure-1.
  2. Document physical and chemical evaluation results in the Evaluation Summary Sheet – Annexure-2.
  3. Prepare a Finalized Formulation Report including selected formula and process parameters – Annexure-3.

6. Abbreviations

  • API: Active Pharmaceutical Ingredient
  • QA: Quality Assurance
  • RH: Relative Humidity
  • R&D: Research and Development

7. Documents

  1. Formulation Development Record – Annexure-1
  2. Evaluation Summary Sheet – Annexure-2
  3. Finalized Formulation Report – Annexure-3

8. References

  • ICH Q8 – Pharmaceutical Development
  • USP General Chapter <1207> – Oil-Based Dosage Forms
  • FDA Guidance on Topical Dermatological Drug Products
See also  Gel Manufacturing: SOP for Mixing and Homogenization of Gel Formulations - V 2.0

9. SOP Version

Version: 2.0

10. Approval Section

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

11. Annexures

Annexure-1: Formulation Development Record

Trial No. Oil Type Gelling Agent Concentration (%) Remarks

Annexure-2: Evaluation Summary Sheet

Test Method Result Specification Remarks
Viscosity Brookfield 8000–15000 cps
pH pH Meter 5.5–7.0

Annexure-3: Finalized Formulation Report

Final Formula
Process Parameters
Stability Summary
Approval Signature

Revision History

Revision Date Revision No. Change Description Reason Approved By
15/05/2022 1.0 Initial issue New SOP QA Manager
09/06/2025 2.0 Included detailed annexures Format upgrade QA Manager
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