under various stress conditions.

2. Scope

This SOP applies to all analytical scientists involved in developing and validating stability-indicating methods within the Analytical Method Development (AMD) department for new drug substances and drug products.

3. Responsibilities

• Analytical Development Scientist: Develops and executes the validation protocol, performs stress studies, and documents results.
• QA Personnel: Reviews and approves validation protocol and final report.
• Project Manager: Ensures adherence to timelines and regulatory expectations.

4. Accountability

The Head of Analytical Method Development is accountable for ensuring that validated stability-indicating methods meet regulatory requirements and are properly documented, reviewed, and approved.

5. Procedure

5.1 Preparation and Planning

1. Initiate a validation plan referencing ICH Q2(R1) and Q1A(R2) guidelines.
2. List critical quality attributes (CQAs) of the analyte and degradation products.
3. Obtain reference standards and degradation markers if available.

5.2 Stress Testing

1. Expose samples to stress conditions to induce degradation, including:
• Acid hydrolysis
• Base hydrolysis
• Oxidation (e.g., 3% H₂O₂)
• Thermal degradation
• Photolytic degradation (UV exposure)
2. Document degradation extent and isolate any major degradants if feasible.

5.3 Method Development Adjustments

1. Ensure peak purity and resolution using PDA or MS detection.
2. Adjust chromatographic parameters to achieve separation between active and degradants.
3. Verify retention time reproducibility and peak symmetry.

5.4 Validation Parameters

1. Perform validation for the following parameters:
• Specificity
• Linearity and Range
• Accuracy
• Precision (repeatability and intermediate)
• LOD and LOQ
• Robustness
• System Suitability
2. Document results in Annexure-1 with raw chromatograms attached.

5.5 Data Interpretation and Reporting

1. Use statistical tools for regression, standard deviation, and %RSD calculation.
2. Check for peak purity index ≥ 0.999 to confirm specificity.
3. Compile results into the validation report and submit for QA review.

5.6 Approval and Archival

1. QA to verify the validation report against protocol acceptance criteria.
2. Archive approved report in method validation repository with reference ID.

6. Abbreviations

• SIM: Stability-Indicating Method
• LOD: Limit of Detection
• LOQ: Limit of Quantification
• PDA: Photodiode Array Detector
• RSD: Relative Standard Deviation

7. Documents

1. Annexure-1: Validation Summary Sheet
2. Annexure-2: Stress Study Result Template
3. Annexure-3: Chromatogram Report Binder

8. References

• ICH Q2(R1): Validation of Analytical Procedures
• ICH Q1A(R2): Stability Testing of New Drug Substances and Products
• 21 CFR Part 211 – Subpart I (Laboratory Controls)

9. SOP Version

Version: 2.0

10. Approval Section

	Prepared By	Checked By	Approved By
Signature
Date
Name	Deepali Singh	Ravi Mehra	Dr. Neha Kapoor
Designation	Scientist	QA Reviewer	Head – AMD
Department	Analytical Method Development	Quality Assurance	Analytical Method Development

11. Annexures

Annexure-1: Validation Summary Sheet

Parameter	Acceptance Criteria	Result	Status
Specificity	No interference	Pass	Pass
Linearity	r² ≥ 0.998	0.9991	Pass

Annexure-2: Stress Study Result Template

Record of degradation % under each condition with chromatographic overlay for clarity.

Annexure-3: Chromatogram Report Binder

All PDA chromatograms demonstrating separation of active and degradants.

Revision History:

Revision Date	Revision No.	Details	Reason	Approved By
01/06/2025	2.0	Added expanded PDA-based validation and stress template	Annual Review	Dr. Neha Kapoor
15/07/2022	1.0	Initial issue	New SOP	QA Head