NH2 SPE Cartridges, bed wt. 500 mg, volume 3 ml, 50 pcs/pack

Description

J&K Scientific’s NH2 SPE column sorbents are composed of aminopropyl-bound silica gel. Applications include:

• Removal of negatively charged species such as sulfuric acid
• Determination of drugs and their metabolites including β2-adrenergic agonists, and salicylic acids in biological fluids
• Determination of macrolide residues in food and water
  Specifications:
• Carbon content: 4.5%
• Surface area: 200 m2/g
• Particle size: 40-75 μm
• Average pore size: 100 Å
• Bed weight: 500mg
  Available in:
• 3mL and 6mL volumes

Packing Material	C18	C18	HLB	Carb-GCB/NH2	NH2	NH2	Florisil	Florisil	C18
Bed Weight	500mg	500mg	60mg	500mg	500mg	500mg	500mg	500mg	200mg
Tube Volume	3ml	6ml	3ml	6ml	3ml	6ml	3ml	6ml	3ml
Packaging	50 pcs/pack	30 pcs/pack	50 pcs/pack	30 pcs/pack	50 pcs/pack	30 pcs/pack	50 pcs/pack	30 pcs/pack	50 pcs/pack
Cat.No.	948669	985532	2471244	2471251	2471254	956543	2471234	945557	948669

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1. What is an SPE column and what is its main purpose?
An SPE (Solid Phase Extraction) column is a sample preparation tool used for purification and enrichment. It contains a specific sorbent (e.g., silica-based bonded phases, polymers, or ion-exchange materials). Its purpose is to concentrate target analytes from complex matrices (such as blood, urine, water samples, food extracts) while removing interfering impurities, thereby improving the sensitivity and accuracy of subsequent chromatographic or mass spectrometric analysis.

2. How do I select the right type of SPE column?
Selection depends on the properties of the target compound and the sample matrix:

• Reversed-phase (e.g., C18, C8) : Suitable for non-polar to moderately polar compounds, retained from aqueous solutions.

• Normal-phase (e.g., silica, NH2) : Suitable for polar compounds, retained from organic solutions.

• Ion exchange (SCX, SAX) : Suitable for ionizable basic or acidic compounds.

• Mixed-mode : Offers both reversed-phase and ion-exchange interactions, ideal for complex biological samples.
  → Suggestion: First perform small-scale tests (e.g., using 96-well SPE plates) to screen for retention and elution conditions.

3. What is the standard operating procedure for an SPE column?
Typical four-step process:

1. Conditioning: Wet the sorbent surface using an organic solvent (e.g., methanol).

2. Equilibration: Replace the conditioning solvent with the loading solvent (usually low organic content or a buffer).

3. Loading: Pass the sample through the column at a slow flow rate (1–2 mL/min).

4. Elution: Collect the target analytes using an appropriate elution solvent (e.g., high organic content or pH-adjusted solution).
   Note: Some methods include an intermediate wash step to remove weakly retained interferences without eluting the targets.

4. How does the sample solvent affect recovery during loading?
The effect is significant. The loading solvent should be weaker than the elution solvent (e.g., high aqueous content for reversed-phase mode). If the sample contains a high proportion of organic solvent (e.g., >10% methanol), the target analytes may break through without being retained. It is recommended to dilute the sample with buffer or evaporate the organic solvent under reduced pressure before loading.

5. Why does an SPE column show slow flow or blockage?
Common causes and solutions:

• Particulate blockage: Centrifuge or filter (0.45 µm membrane) the sample before loading.

• Sorbent fine particle aggregation: Avoid vigorous vacuum application; use gravity or positive pressure to control flow rate.

• Protein precipitation in biological matrices: Precipitate proteins with acetonitrile, centrifuge, and use the supernatant.
  For viscous samples (e.g., serum), use columns with larger particle size sorbents (e.g., 50 µm instead of 30 µm).

6. How can I solve the problem of low recovery?
Systematic troubleshooting:

• No retention: Check whether the column type and sample solvent strength are compatible; add an equilibration step after conditioning.

• Incomplete elution: Increase elution solvent strength (e.g., higher organic content or larger volume for reversed-phase); or change the elution solvent pH to deionize the target analytes.

• Degradation/strong adsorption: For compounds unstable at extreme pH, add stabilizers (e.g., 0.1% ascorbic acid) to the elution solvent.

7. Can SPE columns be reused?
Not recommended. Sorbents typically irreversibly adsorb strongly retained impurities. Reuse can lead to cross-contamination, variable recovery, and reduced column performance. Unless in a well-validated, dedicated method (e.g., processing the same clean matrix repeatedly), SPE columns should be used only once.

8. How is the sorbent capacity of a column calculated?
Generally follow the 5% rule: the total mass of target analytes loaded should not exceed 5% of the sorbent mass. For example, for a 500 mg column, the total target amount should be ≤ 25 mg. Actual capacity must be determined experimentally by performing breakthrough tests (loading increasing amounts until breakthrough occurs).

9. What are some general strategies when facing difficulties in method development?

• Start with a simple reversed-phase (C18) column and adjust the methanol/water ratio for elution.

• If peak tailing or recovery is pH-sensitive, consider ion-exchange or mixed-mode phases.

• Use statistical design (e.g., factorial experiments) to quickly optimize conditioning, washing, and elution volumes.

• Consult application databases (e.g., from Waters, Agilent, Supelco) — many mature methods already exist.

10. How does SPE compare to protein precipitation (PPT) and liquid-liquid extraction (LLE)?

• SPE: Provides cleaner extracts, can be automated, but has higher cost and requires more method development.

• PPT: Fast and inexpensive, but offers limited purification and may retain proteins and lipids.

• LLE: Suitable for non-polar compounds, but can suffer from emulsion formation and high solvent consumption.
  → Recommendation: SPE is preferred for bioanalysis; PPT for rapid routine screening; LLE for extremely hydrophobic analytes.