Used in size-exclusion chromatography (SEC) or to compensate for pressure drifts. Example: Increase flow from 0.8 to 1.2 mL/min linearly over 30 minutes to elute high-MW polymers.
While often a sign of column degradation, peak splitting can occur if your sample solvent is much stronger than the program's initial mobile phase. Always try to dissolve your sample in the starting mobile phase composition. Drifting Retention Times
) of sample to inject onto the column. This must be balanced carefully: too small an injection leads to poor sensitivity, while too large an injection causes column overload, peak splitting, and poor resolution. D. Detector Settings
Highly regarded for its universal instrument control, enabling users to program systems from different hardware vendors within a unified interface. hplc program
Setting the speed at which the mobile phase travels through the column.
Start with a generic gradient: 5–95% organic over 20 minutes at 1.0 mL/min. This "scouting run" reveals the retention window.
Typically set between 0.5 mL/min and 2.0 mL/min for conventional HPLC, and much lower for regular Ultra-High Performance Liquid Chromatography (UHPLC). Used in size-exclusion chromatography (SEC) or to compensate
| Time (min) | % A (Water) | % B (Acetonitrile) | Curve | |------------|-------------|---------------------|-------| | 0.00 | 95 | 5 | 1 | | 10.00 | 50 | 50 | 6 | | 15.00 | 5 | 95 | 6 | | 18.00 | 5 | 95 | 1 | | 18.10 | 95 | 5 | 1 | | 22.00 | 95 | 5 | 1 |
A poorly written program leads to shifting retention times, co-eluting peaks, and baseline noise. A well-optimized program delivers sharp, reproducible peaks and high-throughput efficiency. 2. Core Components of an HPLC Program Time Table
Flow rate determines how quickly the mobile phase travels through the column. While higher flow rates speed up analysis, they increase backpressure. You must balance the flow rate to maximize speed without exceeding the pressure limits of your column or instrument. Injection Volume Always try to dissolve your sample in the
Measures the compounds as they elute (typically via UV spectroscopy). The Control Unit: The software that ties it all together. 📋 4 Steps to Build Your Method 1. Scouting (Method Screening)
If your detector's data rate is too slow, you will miss the true peak shape, distorting quantification. Aim for a data rate that captures at least 15 to 20 data points across a single peak .
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Usually measured in mL/min, the flow rate affects the "backpressure" of the system and the speed of analysis. While higher flow rates speed up the process, they can reduce resolution and strain the column. Column Temperature
