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Multiple Factors Affecting Chromatography Column Lifespan and Their Solutions
Created on 05.14
**Information collect from Internet
The lifespan of a chromatographic column is a matter of considerable concern, as it is directly linked to costs. What factors influence the duration of a column's service life? Are there methods to extend this lifespan?
Possible Contributing Factors
① Chromatographic conditions are relatively extreme
② The column exhibits poor tolerance
③ The sample is relatively contaminated
④ No protective measures have been implemented
1. Chromatographic conditions are relatively extreme
Chromatographic conditions are considered extreme when:
① The pH of the mobile phase is excessively extreme;
② The buffer salt concentration in the mobile phase is excessively high;
③ Column pressure is excessively high;
④ Column temperature is excessively high.
1. Standard silica-based columns typically tolerate pH values between 2 and 6. Below pH 2, the bonded phase may hydrolyse and detach; above pH 7, the silica packing may dissolve and leach.
Solution: For extreme pH requirements, employ organic hybrid columns with broad pH tolerance.
2. Excessively high buffer salt concentration in the mobile phase:
① Mechanical impurities in buffer salts may also be elevated; membrane filtration of buffer salts is required.
② At high buffer salt concentrations, excessive organic phase proportion in gradients may cause salt precipitation, blocking mixers, injectors, columns, and tubing.
Solution: Avoid excessive organic phase proportion, or add 20% water to the organic phase.
3. High column pressure due to high mobile phase viscosity:
High-viscosity solvents: e.g., isopropanol, ethanol, dioxane, methanol-water mixtures
Solution: 1) Switch to a lower-viscosity mobile phase; 2) Reduce flow rate; 3) Appropriately increase column temperature;
4. Manufacturers generally recommend column temperatures below 50°C, as excessive heat may shorten column lifespan.
Solution: Employ organohybridised columns for enhanced thermal tolerance.
2.Column Tolerance Issues
1. Organic hybrid columns, as previously mentioned, exhibit superior tolerance to environmental pH and temperature fluctuations.
2. Microporous structures within silica matrices, akin to dental fissures, readily cause sample retention or dead adsorption.
Solution: Employing specialised techniques to minimise microporosity significantly extends column lifespan.
3. Smaller particle size columns are more prone to elevated column pressure
Solution: Employ high-efficiency core-shell columns. Larger-particle-size core-shell columns exhibit minimal efficiency reduction while offering greater tolerance to pressure increases caused by contamination.
3.The sample is dirty
We must understand the sample's origin—whether it is a natural product extract, biological sample, fermentation product, or synthetic compound. For natural product extracts, our preparatory work involves enriching the target compound based on its properties while removing contaminants like pigments that could fouling the column. For biological samples—which may originate from tissues, blood, etc.
we must eliminate column-fouling components such as phospholipids and proteins while enriching low-abundance target components. For fermentation products, nutrients like sugars in the fermentation broth and components from broken microbial cells must be removed, whilst low-concentration target components are enriched. For synthetic products, we must identify residual components, by-products, and excess raw materials in the reaction solution, appropriately removing components that contaminate the column.
Solutions: ① Employ solvent extraction or precipitation methods for impurity removal or enrichment; ② For small sample volumes, utilise solid-phase extraction (SPE) for sample preparation;③ For large sample volumes, employ oversized columns to adsorb impurities or enrich target compounds.
4.Column-front protection
Sources of column contamination: ① Originating from the sample; ② Originating from the mobile phase.
Solutions: 1) Install an online filter upstream of the injector to prevent contaminants in the mobile phase from entering the column;
2) Place a guard column upstream of the main column to prevent contaminants such as strongly retained substances in the sample from entering the column, while also providing secondary protection against contaminants in the mobile phase.
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