Hplc Program Review

Different manufacturers use different software, but the logic is universal.

To evaluate the performance of an existing isocratic HPLC program for the separation and quantification of Caffeine, Paracetamol, and Aspirin in a combined tablet formulation, and to propose optimization parameters if resolution or efficiency targets are not met.

Instrument: [e.g., Agilent 1260 Infinity II, Waters Alliance e2695] Column: [e.g., C18, 150 x 4.6 mm, 5 µm] Detection: [e.g., UV-Vis at 254 nm / PDA / Fluorescence] hplc program

| Issue | Potential Cause | Program-Related Factor | | :--- | :--- | :--- | | Aspirin tailing | Degradation or silanol interaction | Isocratic 60% methanol may not maintain optimal pH (needs ~pH 3.0) | | Low plate count (Aspirin) | High solvent strength | 60% methanol is too strong, reducing retention and efficiency |

A professional HPLC program always includes safety limits: Create clear SOPs covering: | Vial Position |

Create clear SOPs covering:

| Vial Position | Sample ID | Injection Type | Run Time (min) | | :--- | :--- | :--- | :--- | | A1 | Blank (Mobile Phase) | Blank | 25 | | A2 | Standard – Level 1 | Calibration | 25 | | A3 | Standard – Level 2 | Calibration | 25 | | A4 | Standard – Level 3 | Calibration | 25 | | B1 | QC Sample | Quality Control | 25 | | B2 | Sample 001 | Unknown | 25 | | B3 | Sample 002 | Unknown | 25 | | B4 | Standard – Level 2 (Check) | Continuing Calibration | 25 | Action Items:

The examined isocratic HPLC program successfully separates Caffeine and Paracetamol but fails to meet acceptance criteria for Aspirin due to peak tailing and low plate count. The primary program flaws are:

Action Items:

Final Verdict: The current program is not fit for purpose for Aspirin quantification but can be made compliant with the simple modifications outlined above.

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