Scope

This SOP applies to all analytical methods developed and validated within the Analytical Method Development (AMD) department, including chromatographic (HPLC/GC), spectrophotometric (UV), and titrimetric methods where system performance indicators must be defined.

3. Responsibilities

• Analytical Scientist: Designs the method, executes experiments, and proposes system suitability parameters.
• QA Reviewer: Verifies adequacy and relevance of the established criteria in line with regulatory standards.
• Department Head: Approves final system suitability specifications to be included in method validation reports.

4. Accountability

The AMD Department Head is accountable for ensuring compliance of system suitability parameters with current Good Manufacturing Practice (cGMP) guidelines and ICH Q2(R1) expectations.

5. Procedure

5.1 Understanding System Suitability

System suitability tests are integral to analytical methods and ensure that the complete system (instrument, column, reagents, analyst) is performing adequately before analysis of test samples. Parameters include but are not limited to resolution, tailing factor, theoretical plates, repeatability (RSD), and signal-to-noise ratio.

5.2 Selection of System Suitability Parameters

1. Identify critical quality attributes (CQA) of the analyte (e.g., retention time, peak shape, resolution from adjacent peaks).
2. During method development, inject a system suitability solution containing the analyte(s) and related substances.
3. Measure:
   • Resolution (Rs): Between analyte and nearest impurity.
   • Tailing Factor (T): Should be ≤ 2.0 unless otherwise justified.
   • Theoretical Plates (N): Minimum acceptance values as per method design.
   • RSD (%): Peak area from replicate injections (typically 5 or 6).

5.3 Repeatability and Reproducibility

1. Inject 5–6 replicate injections of standard solution at the beginning of each analytical run.
2. Calculate RSD of peak area or peak height.
3. Acceptable RSD: ≤ 2.0% unless specific product guidance or ICH justification exists.

5.4 Documentation of Parameters

1. Document parameter values observed during method optimization (Annexure-1).
2. Justify each selected parameter based on regulatory precedence or historical performance.
3. Ensure parameters are included in the method validation protocol and report.

5.5 Revalidation or Updates

1. Re-evaluate system suitability if there are changes to:
   • Column type or dimension
   • Instrument make/model
   • Mobile phase pH or composition
2. Document changes and justification for any revised criteria in Annexure-2.

5.6 Failure of System Suitability

1. If system suitability criteria fail:
   • Do not inject samples.
   • Document failure in Analytical Logbook (Annexure-3).
   • Investigate and correct root cause before proceeding.

6. Abbreviations

• Rs: Resolution
• RSD: Relative Standard Deviation
• cGMP: Current Good Manufacturing Practices
• ICH: International Council for Harmonisation
• HPLC: High Performance Liquid Chromatography

7. Documents

1. Annexure-1: System Suitability Design Log
2. Annexure-2: Revalidation Criteria Update Sheet
3. Annexure-3: System Suitability Failure Log

8. References

• ICH Q2(R1) – Validation of Analytical Procedures
• USP General Chapter <621> – Chromatography
• FDA Guidance – Analytical Procedures and Methods Validation

9. SOP Version

Version: 2.0

10. Approval Section

	Prepared By	Checked By	Approved By
Signature
Date
Name	Anjali Thakur	Yogesh More	Dr. Ashwini Shah
Designation	Senior Analyst – AMD	QA Executive	Department Head
Department	Analytical Method Development	Quality Assurance	Analytical Method Development

11. Annexures

Annexure-1: System Suitability Design Log

Method ID	Analyte	System Parameter	Target Value	Rationale
AMD-MTH-362-01	API-A	Rs ≥ 2.0	2.3	Critical separation from impurity B
AMD-MTH-362-01	API-A	Tailing Factor	≤ 1.5	Peak symmetry

Annexure-2: Revalidation Criteria Update Sheet

Date	Change	Reason	Impact	Updated By
12/04/2025	Column change: C18 to Phenyl	Improved selectivity	Updated Rs and TF criteria	Anjali Thakur

Annexure-3: System Suitability Failure Log

Date	Instrument ID	Failure Description	Action Taken	Status
21/05/2025	HPLC-012	RSD > 2.5%	Column flushed, standard re-prepared	Resolved

Revision History:

Revision Date	Revision No.	Details	Reason	Approved By
01/06/2025	2.0	Inclusion of Annexure-3 and root cause tracking format	Annual SOP Review	Dr. Ashwini Shah
12/09/2022	1.0	Initial issue	New Method SOP	QA Head