routine stability studies, validation batches, or in response to out-of-specification (OOS) or out-of-trend (OOT) results.

3. Responsibilities

• QC Analyst: Conducts chromatographic analysis for degradation profiling.
• QC Chemist: Prepares and interprets spectral data using MS, NMR, FTIR, or UV techniques.
• QA Executive: Reviews the analytical reports and ensures compliance with regulatory filings.

4. Accountability

The Head – Quality Control is accountable for ensuring proper identification, documentation, and reporting of degradation products found in gel formulations.

5. Procedure

5.1 Initial Assessment

1. Review stability testing data and compare chromatographic profiles to identify unknown peaks indicating potential degradation.
2. Confirm the presence of such peaks by repeating the analysis using a freshly prepared sample under similar conditions.

5.2 Sample Preparation

1. Prepare the gel sample using extraction methods appropriate to the matrix, such as methanol extraction or liquid-liquid separation.
2. Filter the sample using a 0.45 μm filter and ensure sample integrity by performing blank and spiked sample runs.

5.3 Chromatographic Analysis

1. Conduct HPLC or UPLC analysis using stability-indicating methods validated for the product.
2. Use photodiode array (PDA) detection to assess UV spectra and detect co-eluting compounds.
3. Record retention time (RT), peak height, area, and absorbance maxima of suspected degradation peaks.

5.4 Degradation Product Identification

1. Use LC-MS/MS (Liquid Chromatography–Mass Spectrometry) to determine molecular weights and fragmentation patterns.
2. If required, isolate the degradation product via preparative chromatography for further analysis using NMR or FTIR.
3. Interpret the spectra and identify the degradation product structure using known libraries or reference standards.

5.5 Root Cause Evaluation

1. Correlate the identified degradation products with possible degradation pathways (hydrolysis, oxidation, photolysis, etc.).
2. Assess formulation variables, packaging material, storage conditions, and processing parameters contributing to degradation.

5.6 Documentation and Reporting

1. Summarize all findings in a “Degradation Product Investigation Report” (Annexure-1).
2. Update regulatory stability summaries and product development reports with identified degradation profiles.
3. Document all chromatograms, spectra, raw data, and calculations in the laboratory records.

6. Abbreviations

• HPLC: High-Performance Liquid Chromatography
• UPLC: Ultra-Performance Liquid Chromatography
• MS: Mass Spectrometry
• NMR: Nuclear Magnetic Resonance
• PDA: Photodiode Array
• OOS: Out-of-Specification
• OOT: Out-of-Trend

7. Documents

1. Degradation Product Investigation Report – Annexure-1
2. Stability Study Data
3. Chromatographic and Spectral Raw Data
4. Instrument Calibration Certificates

8. References

• ICH Q3B(R2): Impurities in New Drug Products
• ICH Q1A(R2): Stability Testing Guidelines
• USP <1058>: Analytical Instrument Qualification

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: Degradation Product Investigation Report

Product Name
Batch Number
Manufacturing Date
Study Type	(Accelerated/Real-time)
Storage Condition
Degradation Product Identified
RT & Area (%)
MS/NMR/FTIR Summary
Probable Root Cause
Corrective Actions Suggested
Investigation Conducted By
Reviewed By
Approval By

Revision History

Revision Date	Revision No.	Change Description	Reason	Approved By
01/06/2022	1.0	Initial version	New SOP	QA Head
02/06/2025	2.0	Added structured identification workflow, MS/NMR analysis	Annual review	QA Head