The method is essential for developing stability-indicating analytical procedures as per ICH Q1A(R2) and Q2(R2) guidelines.

2. Scope

This SOP applies to all APIs and finished pharmaceutical dosage forms being evaluated in the Analytical Method Development (AMD) department. It includes oxidative degradation using hydrogen peroxide (H₂O₂) at varying concentrations and durations.

3. Responsibilities

• Analytical Scientist: Designs the oxidative degradation protocol and interprets results.
• Lab Analyst: Prepares and analyzes oxidized samples and records degradation profiles.
• QA Officer: Reviews study documentation and ensures procedural compliance.
• Head – AMD: Approves the method and final study report for validation and regulatory filing.

4. Accountability

The Head of AMD is accountable for ensuring oxidative degradation studies are conducted with scientific rigor and documented as per regulatory expectations.

5. Procedure

5.1 Protocol Design

1. Design a written protocol specifying:
   • Sample name, batch, and strength
   • Hydrogen peroxide concentration (3% or 10%)
   • Temperature and exposure time
   • Analytical method and detection wavelength
2. Obtain QA and department head approvals prior to execution.

5.2 Oxidative Stress Conditions

1. Prepare fresh 3% or 10% H₂O₂ solution just before use.
2. Dissolve API/formulation in suitable solvent (methanol, water, etc.).
3. Add equal volume of H₂O₂ to the solution.
4. Incubate at room temperature (25 ± 2°C) or 40°C for 1–6 hours depending on reactivity.

5.3 Sample Neutralization and Preparation

1. Post-degradation, add a few drops of catalase or sodium thiosulfate to quench residual peroxide.
2. Filter using 0.45 µm PVDF syringe filter.
3. Dilute with mobile phase to desired concentration.
4. Document all observations in Annexure-1: Oxidative Stress Log.

5.4 Analytical Evaluation

1. Analyze stressed and control samples using validated HPLC/UPLC method.
2. Record retention times, area, % assay, % degradation, and new peaks observed.
3. Assess peak purity using PDA detection or spectral overlays.
4. Report findings in Annexure-2: Oxidative Degradation Data Sheet.

5.5 Interpretation of Results

1. % Degradation between 5%–20% is considered acceptable to demonstrate method sensitivity.
2. Degradation peaks must be baseline separated from main API peak.
3. Any co-elution or merging of degradant with API peak invalidates method specificity.

6. Abbreviations

• API: Active Pharmaceutical Ingredient
• HPLC: High-Performance Liquid Chromatography
• UPLC: Ultra-Performance Liquid Chromatography
• PDA: Photodiode Array Detector
• SOP: Standard Operating Procedure

7. Documents

1. Oxidative Stress Log – Annexure-1
2. Oxidative Degradation Data Sheet – Annexure-2

8. References

• ICH Q1A(R2) – Stability Testing of New Drug Substances and Products
• ICH Q2(R2) – Validation of Analytical Procedures
• USP General Chapter <1225> – Validation of Compendial Procedures

9. SOP Version

Version: 2.0

10. Approval Section

	Prepared By	Checked By	Approved By
Signature
Date
Name
Designation
Department

11. Annexures

Annexure-1: Oxidative Stress Log

Sample ID	H2O2 Conc.	Temp (°C)	Duration (hrs)	Remarks
OX-API-019	3%	25	4	No visual discoloration

Annexure-2: Oxidative Degradation Data Sheet

Sample ID	Assay (%)	% Degradation	New Peaks (RT)	Peak Purity	Conclusion
OX-API-019	87.6	12.4	5.3, 6.8	Pass	Oxidation observed

Revision History:

Revision Date	Revision No.	Details	Reason	Approved By
04/05/2025	2.0	Added neutralization procedure and clarified peroxide concentration range	Regulatory inspection preparation