Standard Operating Procedure for HPTLC Method Development in Pharmaceutical Analysis

Department	Analytical Method Development
SOP No.	SOP/AMD/169/2025
Supersedes	SOP/AMD/169/2022
Page No.	Page 1 of 14
Issue Date	19/05/2025
Effective Date	20/05/2025
Review Date	19/05/2026

1. Purpose

To describe the procedure for the development and validation of High-Performance Thin Layer Chromatography (HPTLC) methods for qualitative and quantitative analysis of active pharmaceutical ingredients (APIs), excipients, and finished dosage forms.

2. Scope

This SOP applies to the Analytical Method Development (AMD) team responsible for developing HPTLC methods for routine analysis, stability studies, herbal drug standardization, and fingerprinting purposes.

3. Responsibilities

• Analytical Scientist: Develops, optimizes, and validates HPTLC methods.
• Lab Analyst: Conducts experimental runs and maintains instrumentation.
• QA Officer: Reviews validation documents and ensures GMP compliance.
• Head – AMD: Approves method protocols and reports for regulatory use.

4. Accountability

The Head of AMD is accountable for ensuring scientifically sound and regulatory-compliant HPTLC methods are developed and implemented.

5. Procedure

5.1 Method Development Strategy

1. Understand the nature and solubility of the analyte.
2. Select appropriate stationary phase (e.g., silica gel 60 F₂₅₄ precoated plates).
3. Choose a suitable mobile phase by trial and error using binary or ternary combinations (e.g., toluene:ethyl acetate:formic acid).
4. Optimize the mobile phase ratio to obtain good resolution (Rf 0.2–0.8).

5.2 Sample and Standard Preparation

1. Dissolve standard/API in methanol, ethanol, or appropriate solvent at known concentration (e.g., 1 mg/mL).
2. Prepare test solution from sample matrix using the same solvent and filtration through 0.45 µm filter.

5.3 Plate Application and Development

1. Use automatic applicator to apply 5–10 µL bands of standard and sample at least 15 mm from bottom edge of plate.
2. Saturate chamber with mobile phase using saturation pads for 20–30 min before development.
3. Develop the plate up to 80 mm migration distance.
4. Air-dry the plate and proceed to detection.

5.4 Detection and Quantification

1. Detect under UV light at 254 nm or 366 nm depending on analyte properties.
2. If necessary, derivatize plate using iodine chamber, anisaldehyde sulfuric acid, or ninhydrin spray reagents.
3. Scan the plate using densitometer in absorbance or fluorescence mode.
4. Calculate Rf values and peak areas.
5. Quantify based on standard calibration using linear regression. R² ≥ 0.995 is acceptable.

5.5 Method Validation

1. Validate HPTLC method per ICH Q2(R2) guidelines:
   • Specificity – No matrix interference at analyte Rf
   • Linearity – 50% to 150% of working concentration
   • Precision – Intra- and inter-day RSD ≤ 5%
   • Accuracy – Recovery between 95% and 105%
   • Robustness – Mobile phase variation, plate batch variability
2. Document results in Annexure-1: Validation Summary.

5.6 Documentation

1. Record sample and standard application volumes, chromatograms, Rf values, calibration graphs.
2. Maintain electronic and physical copies of chromatograms with analyst signature and date.
3. Archive reports per GMP guidelines for a minimum of 5 years.

6. Abbreviations

• HPTLC: High-Performance Thin Layer Chromatography
• Rf: Retardation Factor
• UV: Ultraviolet
• SOP: Standard Operating Procedure

7. Documents

1. Validation Summary – Annexure-1
2. Chromatogram Records – Annexure-2
3. Calibration Curve Log – Annexure-3

8. References

• ICH Q2(R2) – Validation of Analytical Procedures
• USP General Chapter <203> – HPTLC
• Ph. Eur. 2.2.27 – Thin Layer Chromatography

9. SOP Version

Version: 2.0

10. Approval Section

	Prepared By	Checked By	Approved By
Signature
Date
Name
Designation
Department

11. Annexures

Annexure-1: Validation Summary

Parameter	Result	Acceptance Criteria	Status
Linearity	R² = 0.9981	≥ 0.995	Pass
Recovery	98.3%–101.2%	95%–105%	Pass

Annexure-2: Chromatogram Records

Sample ID	Rf Value	Peak Area	Analyst
HPTLC/2025/002	0.58	4352	Rajesh Kumar

Annexure-3: Calibration Curve Log

Concentration (µg/mL)	Peak Area	Analyst
100	2987	Sunita Reddy
150	4261	Sunita Reddy
200	5632	Sunita Reddy

Revision History:

Revision Date	Revision No.	Details	Reason	Approved By
04/05/2025	2.0	Added new annexures and enhanced specificity protocol	Annual SOP Review