Normal Phase SPE Cartridge
Description
A Normal Phase Solid Phase Extraction (SPE) cartridge is a device used in chromatography for sample preparation and purification. It utilizes a stationary phase that is polar or hydrophilic in nature, while the mobile phase is non-polar or hydrophobic. This type of chromatography is based on differential partitioning, where compounds with a higher affinity for the stationary phase are retained, while those with greater affinity for the mobile phase elute more rapidly.
Normal phase SPE cartridge is the process of dissolving polar substances in non-polar solvents (diethyl ether, n-butane, etc.), and being adsorbed by a strong polar stationary phase. The forces between the two include dipole pairs, hydrogen bonds, and electronic pairs. Commonly used adsorbents are alumina, magnesium silicate, diatomaceous earth, and silica gel.
- Stationary phase (filler): polar substances.
- Separation objects of normal phase SPE cartridges: polar, medium polarity, non-polar.
- Mobile phase (eluent): non-polar, medium-polarity.
- Forces between adsorbent and compound: hydrogen bond, π-π bond, etc.
- Commonly used normal phase solid phase extraction columns:
- The polar functional group bonded silica gel such as -CN, -NH2;
- Polar adsorption substances such as Silica, Florisil, and Alumina.
Main Application of Normal Phase SPE Cartridge
Normal Phase SPE cartridges are particularly useful for the extraction and purification of polar or hydrophilic compounds, such as polar metabolites, certain drugs, pesticides, and environmental contaminants. By selectively isolating and concentrating these compounds, Normal Phase SPE allows for enhanced sensitivity and improved chromatographic analysis in various applications, including pharmaceutical research, environmental monitoring, and forensic analysis.
