Chromolith® RP-18e HighResolution HPLC Columns


Chromolith® HighResolution RP-18e columns

Request Information

If you need to combine the high flowrates, little matrix sensitivity, low back pressure, and long lifetime of Chromolith® HPLC columns with even higher efficiency, you need Chromolith® HighResolution. Chromolith® HighResolution RP-18 endcapped HPLC columns are perfect for fast, robust and highly efficient separation of hydrophobic to medium polar compounds at low column back pressure. Chromolith® HighResolution RP-18e columns are the ideal alternative to sub 3 µm particulate columns: They generate similar results as columns packed with core-shell particles but at a much lower back-pressure. Moreover, Chromolith® HighResolution columns offer more than 30% longer lifetime compared with particulate columns.

Higher Efficiency

Like all our Chromolith® HPLC columns, Chromolith® HighResolution RP-18e columns consist of a monolithic rod of high-purity silica with a bimodal structure: macropores reducing back pressure, and mesopores creating a very large active surface area. In contrast to standard Chromolith® columns, however, HighResolution columns feature smaller macropores (1.15 μm as opposed to 2 μm). For this reason, Chromolith® HighResolution columns offer at least 50% higher efficiency than standard Chromolith® columns (exceeding 140,000 plates/meter [Anthracene]), as well as improved peak shape with excellent symmetry. Back pressure is higher than with standard Chromolith® columns but still less than half that of any particulate column of the same dimensions.

Easy Method Transfer

Because the chemical basis of Chromolith® HighResolution RP-18e columns is identical to that of high-end particulate silica columns (e.g. Purospher®), chromatographers can easily use standard methods when developing new protocols, and method transfer from particulate columns to monolithic Chromolith® RP-18 columns is simple and seamless. Chromolith® HighResolution RP-18e columns are included in the US Pharmacopoeia in category L1.

Features and Benefits

  • High throughput at high flow rates
  • Lower matrix sensitivity
  • Column performance is comparable to sub 3 µm particle-packed columns and at least 50 % higher than that of standard Chromolith® columns
  • Back pressure is only half that of particulate columns or even less
  • 30+% longer column lifetime compared to particle-packed columns
  • Possibility of flow gradients
  • Added column performance by column coupling
  • Simple method transfer from particulate columns

Different Lengths to Suit Your Applications

Column efficiency is directly proportional to column length. Moreover, increasing column length increases resolution due to the higher number of theoretical plates per column.

Chromolith® HighResolution RP-18e columns are available with various lengths in order to perfectly match your application requirements. Moreover, two or even more Chromolith® HighResolution columns can be easily coupled thanks to the low back pressure.

Ordering Number
Chromolith® HighResolution RP-18e, (L) 50 mm
For fast separation of simple mixtures: 50 mm Chromolith® HighResolution offer short run times and lowest back pressures and are ideal for gradient analyses.
Chromolith® HighResolution RP-18e, (L) 100 mm
For rapid separation of more complex mixtures: 100 mm Chromolith® HighResolution columns offer higher efficiency and resolution than 50 mm columns and shorter run times and lower back pressures than 150 mm
New: Chromolith® HighResolution RP-18e, (L) 150 mm
For rapid separation of very complex samples: Our new 150 mm Chromolith® HighResolution columns offer approx. 25% higher resolution than 100 mm HighResolution columns (depending on application). They are ideal for separating more complex mixtures or for applications requiring higher resolution and efficiency.
Chromolith® HighResolution RP-18e (100 mm)
validation kits – For accurate method validation Each validation kit contains three columns from three different production batches. This allows you to easily compare batch-to-batch reproducibility and quality, making the validation kit an ideal tool for quality control and validation laboratories.

Application Examples


ColumnChromolith® HighResolution RP-18e 100-4.6mm
Mobile phase ACN / 20mM NaH2PO4 – Buffer pH = 4.5
Gradient  t (min) ACN (%) Buffer (%)
0 20 80
6 40 60
7 40 60
Flow rate 2ml/ min
Column pressure 64-70 bar
Temperature ambient
Detection uv- 230nm
Detector cell 16µl
Injection vol. 2µl
Sample Ascorbic Acid     140 µg/ml
4-Hydroxy-benzoic acid 150 µg/ml
Benzoic acid 150 µg/ml
Sorbic acid 160 µg/ml
Methyl-4-Hydroxybenzoate 140 µg/ml
Ethyl-4-Hydroxybenzoate 150 µg/ml
Propyl-4-Hydroxybenzoate 150 µg/ml
Low pH beta-blockers

ColumnChromolith® HighResolution RP-18e 100-4.6mm
Solvents 23% ACN / 77% KH2PO4 Buffer 20mM pH = 2.5
Flow rate 2ml/ min
Column pressure 76 bar
Temperature ambient
LC system LaChrom L7000
Detection uv- 230nm
Detector cell 16µl
Injection vol.      1µl
Sample Atenolol 100 µg / ml
Pindolol 300 µg / ml
Metoprolol 155 µg / ml
Bisoprolol 100 µg / ml
Labetalol 200 µg / ml
Propanolol 20 µg / ml
Alprenolol 150 µg / ml
 Low pH beta-blockers
Separation of a mixture of 5 drugs

ColumnChromolith® HighResolution RP-18e 100-4.6mm
Mobile phase    ACN + 0.1% TFA / water + 0.1% TFA
Gradient t [min] ACN [%] Water [%]
0 1 99
1,8 60 40
4,5 60 40
Flow rate 2ml/ min
Column pressure 20-31 bar
Temperature ambient
Detection uv- 230nm
Detector cell 16µl
Injection vol.      2µl
Sample     Actaminophen 98 µg/ml
Quinine 152 µg/ml
Salicylic Acid 140 µg/ml µg/ml
Diltiazem 81,2 µg/ml
Verapamil 98,4 µg/ml
Separation of a mixture of 5 drugs
Separation of 11 steroids

ColumnChromolith® HighResolution RP-18e 100-4.6mm
Mobile phase    ACN / water
Gradient              t [min] ACN [%] Water [%]
0 35 65
2,5 95 5
4,5 95 5
Flow rate 2ml/ min
Column pressure 29 - 77 bar
Temperature 22°C
LC system: Dionex UltiMate3000 (analytical)
Detection uv- 240nm
Detector cell 11µl
Injection vol.      2µl
Sample Fluoxymesterone 51 µg / ml
Boldenone 43 µg / ml
Methandrostenolone 8 µg / ml
Testosterone 77 µg / ml
Methyltestosterone 35 µg / ml
Boldenone-Acetate 13 µg / ml
Testosterone-Acetate 71 µg / ml
Nandrolone-Propionate 71 µg / ml
Testosterone-Propionate 14 µg / ml
Nandrolone-Phenylpropionate 69 µg / ml
Testosterone-Isocaproate 184 µg / ml
  Separation of 11 steroids


Silica type High-purity
Particle size Monolithic
Macropore size 1.15 µm
Mesopore size 15 nm (150 Å)
Pore volume 1 mL/g
Total pore volume 2.9 mL/g
Total porosity >80 %
Surface area 250 m2/g
Surface modification RP-18e (octadecylsilan with full end-capping)
Carbon content 18 %


Application Notes Finder
Search for chromatography applications by analyte, column type, detection method, sorbent type or any other search term:
HPLC Workflow Solutions - Stationary Phase

HPLC Workflow Solutions

Stationary Phase

Learn More
Chromatography Application World

Application World

The ultimate source for the latest news in your field

Learn More


Jun 16
06/16/19 - 06/20/19
HPLC 2019
University of Milano-Bicocca
Milan, Italy
Analytics and Sample Preparation Europe 20190616
Mar 17
03/17/19 - 03/21/19
Pittcon 2019
Pennsylvania Convention Center
Philadelphia, Pa, USA
North America 20190317
Nov 12
11/12/19 - 11/14/19
Nürnberg Exhibition Centre
Nuremberg, Germany
,Reagents Chemicals and Labware,Industrial Biomonitoring,Analytics and Sample Preparation Europe 20191112