HPLC Verification
HPLC verification refers to analyzing a substance through High-Performance Liquid Chromatography to verify its precise chemical identity and assess its purity percentage.
What It Implies
Identity Confirmation: Assesses the duration it takes for a compound to navigate the system (retention time) compared to a known reference standard.
Purity Percentage: Evaluates the proportion of the target peak to the total peaks displayed on a graph (chromatogram), frequently indicating purity levels such as ≥ 98%.
Quality Control: Verifies that a produced batch or research sample contains what it asserts and is free from harmful impurities. You can learn the basic principles via the Agilent HPLC Fundamentals guide.
The Verification Process
Sample Preparation: Dissolve the solid or liquid sample in an appropriate solvent and filter it to eliminate particles that may block the instrument.
Injection: Introduce a small volume of the prepared sample into the HPLC apparatus.
Separation: A high-pressure pump forces a liquid solvent (mobile phase) through a densely packed tube (column). Various molecules travel at varying speeds depending on their chemical characteristics.
Detection: As compounds exit the column, a UV (ultraviolet) or photodiode array detector measures them and converts the results into a visual chart of peaks.
Data Analysis: Software computes the area under the primary peak in comparison to secondary impurity peaks to generate a final purity score.