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Catalog #Particle SizeLengthIDModificationUnits
917835B
3 μm
50 mm
0.3 mm
Capillary Column
ea.
917836B
3 μm
150 mm
0.3 mm
Capillary Column
ea.
9178332
3 μm
30 mm
2.1 mm
ea.
9178352
3 μm
50 mm
2.1 mm
ea.
9178312
3 μm
100 mm
2.1 mm
ea.
9178362
3 μm
150 mm
2.1 mm
ea.
917833E
3 μm
30 mm
3.0 mm
ea.
917835E
3 μm
50 mm
3.0 mm
ea.
917831E
3 μm
100 mm
3.0 mm
ea.
917836E
3 μm
150 mm
3.0 mm
ea.
9178335
3 μm
30 mm
4.6 mm
ea.
9178355
3 μm
50 mm
4.6 mm
ea.
9178315
3 μm
100 mm
4.6 mm
ea.
9178365
3 μm
150 mm
4.6 mm
ea.
9178532
5 μm
30 mm
2.1 mm
ea.
9178552
5 μm
50 mm
2.1 mm
ea.
9178512
5 μm
100 mm
2.1 mm
ea.
9178562
5 μm
150 mm
2.1 mm
ea.
9178522
5 μm
200 mm
2.1 mm
ea.
9178572
5 μm
250 mm
2.1 mm
ea.
917853E
5 μm
30 mm
3.0 mm
ea.
917855E
5 μm
50 mm
3.0 mm
ea.
917851E
5 μm
100 mm
3.0 mm
ea.
917856E
5 μm
150 mm
3.0 mm
ea.
917852E
5 μm
200 mm
3.0 mm
ea.
917857E
5 μm
250 mm
3.0 mm
ea.
9178535
5 μm
30 mm
4.6 mm
ea.
9178555
5 μm
50 mm
4.6 mm
ea.
9178515
5 μm
100 mm
4.6 mm
ea.
9178565
5 μm
150 mm
4.6 mm
ea.
9178525
5 μm
200 mm
4.6 mm
ea.
9178575
5 μm
250 mm
4.6 mm
ea.

Avoiding Chain Collapse

Moderate to very weak, polar solutes may require high aqueous mobile phases in order to achieve retention on C18 phases. Unfortunately, most C18 packings experience chain collapse under these conditions. This is chromatographically manifested as a partial or complete loss of retention, with analytes eluting at or close to the solvent front. To avoid this, choose the collapse-immune Ultra Aqueous C18 phase, or alternative packings that are resistant to chain folding, such as Ultra IBD.

Application-dedicated HPLC columns have longer lifetimes

Prolong the useful lifetimes of your HPLC columns by dedicating specific columns to specific applications, like analysts who use ion pair reagents often do. Sample components, mobile phase conditions, etc. can cause changes within a column, and sometimes effects of these changes are negligible until the column is used in another application. Although this practice can involve using more columns at one time, and calls for careful bookkeeping, longer lifetimes for individual columns can amount to significant savings.

Avoid the Void Volume

A speedy analysis is important, but avoid the temptation to elute important sample components near the void volume of your column. When you ignore this guideline, you are locked into using the mobile phase as the sample solvent; any admixing of sample solvent and mobile phase causes a baseline disturbance that makes quantification highly unreliable. Also, it is highly likely that the peak at the void volume will soar off-scale. You will avoid these and other potential problems by adjusting conditions such that the first target compound elutes with a capacity factor (k′) of at least 2.0.