manufacturing equipment surfaces following product changeovers or cleaning activities.

2. Scope

This SOP applies to the Analytical Method Development (AMD) and Quality Control departments for the development, validation, and application of TOC analysis in evaluating the effectiveness of equipment cleaning in pharmaceutical manufacturing facilities.

3. Responsibilities

• Analytical Scientist: Develops TOC method, defines validation protocol, interprets results.
• Instrument Analyst: Operates TOC analyzer, performs calibration and sample analysis.
• QA Officer: Reviews and approves TOC data and validation reports.
• Head – AMD: Ensures validation protocols meet regulatory and GMP requirements.

4. Accountability

The Head of Analytical Method Development is accountable for ensuring the TOC method meets sensitivity and specificity standards necessary for compliance with cleaning validation guidelines.

5. Procedure

5.1 Instrument and System Calibration

1. Use a TOC analyzer capable of detecting down to 0.05 ppm C.
2. Perform system suitability using potassium hydrogen phthalate (KHP) and sodium benzoate standards.
3. Conduct calibration with a minimum of 5 concentration levels (e.g., 0.1 to 2.0 ppm C).
4. Validate calibration curve (R² ≥ 0.995) and document in Annexure-1: TOC Calibration Log.

5.2 Sample Collection

1. Collect swab or rinse samples from cleaned equipment surfaces using validated sampling procedures.
2. Use low TOC-grade water and pre-cleaned containers for dilution and collection.
3. Label and store samples at 2–8°C if analysis is delayed beyond 4 hours.

5.3 Method Parameters

1. Sample Introduction: Non-purgeable organic carbon (NPOC) mode preferred.
2. Oxidation Technique: High-temperature combustion (680–720°C) or UV/persulfate oxidation.
3. Detection Method: Non-dispersive infrared (NDIR) or conductivity-based detection.
4. Injection Volume: Typically 50–1000 µL depending on instrument sensitivity.

5.4 Method Validation

1. Validate per ICH Q2(R2) and cleaning validation requirements:
   • Specificity: Ensure water, container, and swab do not interfere.
   • Linearity: 0.05 to 2.0 ppm C (R² ≥ 0.995).
   • LOD/LOQ: Based on S/N ratio (3:1 and 10:1).
   • Accuracy: 85%–115% recovery using spiked samples.
   • Precision: RSD ≤ 5% for replicate injections.
   • Robustness: Evaluate effect of different swab types and rinsing media.
2. Document in Annexure-2: Validation Summary.

5.5 Application in Cleaning Validation

1. Define acceptable TOC limit based on:
   • 10 ppm general limit or
   • Calculation from 1/1000th of minimum therapeutic dose or < 0.1% carryover
2. Perform TOC analysis post-cleaning on worst-case equipment trains.
3. Compare results to established acceptance criteria.
4. Document all results in Annexure-3: Cleaning Validation TOC Report.

6. Abbreviations

• TOC: Total Organic Carbon
• NPOC: Non-Purgeable Organic Carbon
• NDIR: Non-Dispersive Infrared
• LOD: Limit of Detection
• LOQ: Limit of Quantification
• SOP: Standard Operating Procedure

7. Documents

1. TOC Calibration Log – Annexure-1
2. Validation Summary – Annexure-2
3. Cleaning Validation TOC Report – Annexure-3

8. References

• ICH Q2(R2) – Validation of Analytical Procedures
• FDA Guidance for Cleaning Validation
• USP <643> – Total Organic Carbon
• WHO Technical Report Series on Cleaning Validation

9. SOP Version

Version: 2.0

10. Approval Section

	Prepared By	Checked By	Approved By
Signature
Date
Name
Designation
Department

11. Annexures

Annexure-1: TOC Calibration Log

Standard (ppm C)	Instrument Reading	Deviation (%)	Analyst
0.5	0.48	–4.0	Rajesh Kumar
1.0	0.98	–2.0	Rajesh Kumar

Annexure-2: Validation Summary

Parameter	Result	Acceptance	Status
Linearity (R²)	0.9986	≥ 0.995	Pass
Recovery	92%–108%	85%–115%	Pass
Precision	RSD = 3.1%	≤ 5%	Pass

Annexure-3: Cleaning Validation TOC Report

Sample ID	Surface Area (cm²)	TOC Result (ppm)	Limit (ppm)	Status
Rinse-API-MX01	1200	0.6	1.0	Complies

Revision History:

Revision Date	Revision No.	Details	Reason	Approved By
04/05/2025	2.0	Expanded robustness section and updated detection criteria	Annual SOP Review