analytical performance, thereby supporting method reliability under varied laboratory conditions.

2. Scope

This SOP applies to all chromatographic (HPLC, GC), spectrophotometric, potentiometric, and titrimetric analytical methods developed and validated by the Analytical Method Development (AMD) department.

3. Responsibilities

• Analyst: Conducts experiments to test robustness under deliberate parameter variations.
• Method Developer: Selects parameters for robustness evaluation and interprets the data.
• QA Personnel: Reviews robustness results and verifies compliance with acceptance criteria and documentation standards.

4. Accountability

The Head of Analytical Method Development is accountable for ensuring robust methods are developed and validated, and for approving the robustness evaluation reports included in method validation dossiers.

5. Procedure

5.1 Definition

Robustness is the measure of an analytical method’s capacity to remain unaffected by small, deliberate variations in method parameters, demonstrating its reliability during normal usage.

5.2 Parameters Commonly Evaluated

1. Column oven temperature (±2°C)
2. Flow rate (±0.1 mL/min for HPLC)
3. Mobile phase composition (±2% organic content)
4. pH of buffer (±0.2 units)
5. Injection volume (±10%)
6. Wavelength (±2 nm for UV detection)

5.3 Experimental Setup

1. Define a robustness protocol as part of the validation plan.
2. Analyze at least three replicate injections per parameter condition.
3. Ensure all chromatographic runs are processed using consistent integration settings.

5.4 Acceptance Criteria

• No significant change in retention time (±2%)
• No significant change in peak area (±5%)
• %RSD of replicate injections ≤ 2.0%
• Resolution between critical peaks should meet system suitability criteria

5.5 Data Recording

1. Document results in the Robustness Evaluation Log (Annexure-1).
2. Include chromatograms, overlays, and summary statistics in the validation report.
3. Highlight any sensitivity to parameters and recommend fixed conditions if necessary.

5.6 Interpretation

• If significant deviations are observed, adjust method parameters or specify operational controls in the method SOP.
• Results help determine system suitability limits for future routine analysis.

6. Abbreviations

• RSD: Relative Standard Deviation
• Rs: Resolution
• UV: Ultraviolet
• GC: Gas Chromatography
• HPLC: High Performance Liquid Chromatography

7. Documents

1. Annexure-1: Robustness Evaluation Log
2. Annexure-2: Validation Protocol Reference Table
3. Method Validation Summary Report

8. References

• ICH Q2(R1): Validation of Analytical Procedures
• USP General Chapter <1225> Validation of Compendial Procedures
• 21 CFR Part 211

9. SOP Version

Version: 2.0

10. Approval Section

	Prepared By	Checked By	Approved By
Signature
Date
Name	Pooja Rawat	Ravi Kakkar	Dr. Neeta Malhotra
Designation	Analyst – AMD	QA Officer	Head – Analytical Method Development
Department	Analytical Method Development	Quality Assurance	Analytical Method Development

11. Annexures

Annexure-1: Robustness Evaluation Log

Parameter	Condition	RT	Area	%RSD	Remarks
Flow Rate	0.9 mL/min	6.45	2489	0.92	Acceptable
Flow Rate	1.1 mL/min	6.18	2431	1.03	Acceptable

Annexure-2: Validation Protocol Reference Table

• Parameter Adjustments: ± as defined in protocol
• Analyst Initials: PR
• Date: 01/06/2025

Revision History

Revision Date	Revision No.	Details	Reason	Approved By
01/06/2025	2.0	Expanded criteria and parameter list for broader application	Annual SOP review	Dr. Neeta Malhotra
15/04/2022	1.0	Initial issue	New method validation guideline	QA Head