Educational guidance for selecting, installing and caring for CD-Screen columns.
Cyclodextrins are cyclic oligosaccharides commonly described by the number of glucose units in the ring. Alpha-, beta- and gamma-cyclodextrins have different cavity dimensions and physicochemical behavior. Derivatization introduces substituents that can change solubility, charge and distribution complexity.
A parent cyclodextrin is the unsubstituted ring. Derivatized cyclodextrins may be neutral or ionic and may contain a statistical distribution of substitution levels and positions. Degree of substitution expresses the average extent of substitution, while component distribution describes the mixture profile.
The 5 µm, 250 × 4 mm column provides a conventional longer analytical format. The 3 µm, 150 × 4 mm column offers a shorter bed with smaller particles. The best choice depends on required selectivity, efficiency, analysis time, instrument pressure capability and the method being transferred or developed. CD-Screen-IEC should be considered for ionic derivatives.
Confirm flow direction, compatible fittings and solvent miscibility before installation. Introduce flow gradually to avoid pressure shock. Filter or centrifuge samples where suitable, avoid particulate loading, and record injections, solvents and pressure history. Guard-column use should be based on sample cleanliness and method needs.
Use only solvents confirmed to be compatible with the stationary phase and the current mobile phase. Avoid precipitation when changing solvents. Exact flushing volumes, storage solvent, pH range, maximum pressure, flow limits and temperature limits must come from the current manufacturer instruction manual.