Based on the minimum in the van Deemter curves, higher flows than 5um particle columns are required in order to maximize Ascentis Express column efficiency. The suggested starting point for flow rate for Ascentis Express columns: 1.6 mL/min for 4.6 mm ID; 0.8 mL/min for 3.0 mm ID; and 0.4mL/min for 2.1 mm ID.
53939-U
Ascentis® Express 90 Å HILIC (2.7 μm) HPLC Columns
L × I.D. 10 cm × 2.1 mm, HPLC Column
Synonym(s):
Core-shell (SPP) Fused Core Si HPLC column
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About This Item
UNSPSC Code:
41115700
eCl@ss:
32110501
NACRES:
SB.52
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Product Name
Ascentis® Express HILIC, 2.7 μm HPLC Column, 2.7 μm particle size, L × I.D. 10 cm × 2.1 mm
material
stainless steel column
agency
suitable for USP L3
product line
Ascentis®
feature
endcapped: no
manufacturer/tradename
Ascentis®
packaging
1 ea of
parameter
≤100 °C temp. range
600 bar max. pressure (9000 psi)
technique(s)
HPLC: suitable
LC/MS: suitable
UHPLC-MS: suitable
UHPLC: suitable
L × I.D.
10 cm × 2.1 mm
surface area
135 m2/g
impurities
<5 ppm metals
matrix
Fused-Core particle platform
superficially porous particle
matrix active group
silica phase
particle size
2.7 μm
pore size
90 Å
operating pH
1-8
application(s)
food and beverages
separation technique
hydrophilic interaction (HILIC)
normal phase
Quality Level
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Related Categories
1 of 4
This Item | 53974-U | 53972-U | 53934-U |
|---|---|---|---|
| matrix active group silica phase | matrix active group silica phase | matrix active group silica phase | matrix active group silica phase |
| separation technique hydrophilic interaction (HILIC), normal phase | separation technique hydrophilic interaction (HILIC), normal phase | separation technique hydrophilic interaction (HILIC), normal phase | separation technique hydrophilic interaction (HILIC), normal phase |
| L × I.D. 10 cm × 2.1 mm | L × I.D. 3 cm × 4.6 mm | L × I.D. 15 cm × 3 mm | L × I.D. 5 cm × 2.1 mm |
| particle size 2.7 μm | particle size 2.7 μm | particle size 2.7 μm | particle size 2.7 μm |
| product line Ascentis® | product line Ascentis® | product line Ascentis® | product line Ascentis® |
| matrix Fused-Core particle platform, superficially porous particle | matrix Fused-Core particle platform, superficially porous particle | matrix Fused-Core particle platform, superficially porous particle | matrix Fused-Core particle platform, superficially porous particle |
General description
Ascentis Express HPLC columns, through the use of Fused-Core® particle technology, can provide you with both the high speed and high efficiencies of sub-2 μm particles while maintaining lower backpressures. The combination of high efficiency and low backpressure benefits UPLC® (or other ultra high pressure system) users, as well as conventional HPLC users.
Visit the Ascentis Express home page for more information on this new column technology.
Visit the Ascentis Express home page for more information on this new column technology.
Legal Information
Ascentis is a registered trademark of Merck KGaA, Darmstadt, Germany
Fused-Core is a registered trademark of Advanced Materials Technology, Inc.
UPLC is a registered trademark of Waters
related product
Storage Class
11 - Combustible Solids
wgk
WGK 3
flash_point_f
Not applicable
flash_point_c
Not applicable
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Paweł Kubica et al.
Journal of pharmaceutical and biomedical analysis, 127, 184-192 (2016-01-20)
Hydrophilic interaction liquid chromatography (HILIC) coupled with tandem mass spectrometry (MS/MS) was used to separate artificial and natural sweeteners approved for use in European Union (EU). Among three tested HILIC columns (BlueOrchid PAL-HILIC, Ascentis Express Si and Acclaim™ Trinity™ P2)
Tiziana Bertolini et al.
Journal of chromatography. A, 1365, 131-139 (2014-09-23)
A simple, sensitive and fast hydrophilic interaction liquid chromatography (HILIC) method using ultraviolet diode-array detector (UV-DAD)/electrospray ionization tandem mass spectrometry was developed for the automated high performance liquid chromatography (HPLC) determination of sodium risedronate (SR) and its degradation products in
Imran Ali et al.
Biomedical chromatography : BMC, 26(8), 1001-1008 (2012-01-13)
Superficially porous silica particles columns (SPSPCs) are manufactured by different companies. The most common have the brand names Halo, Ascentis Express and Kinetex. These columns provide super fast, sharp peaks and moderate sample loading and back pressure. These are available
Alexandre Grand-Guillaume Perrenoud et al.
Journal of chromatography. A, 1360, 275-287 (2014-08-19)
Superficially porous particles (SPP), or core shell particles, which consist of a non-porous silica core surrounded by a thin shell of porous silica, have gained popularity as a solid support for chromatography over the last decade. In the present study
Jan Soukup et al.
Journal of chromatography. A, 1374, 102-111 (2014-12-30)
Excess adsorption of water from aqueous acetonitrile mobile phases was investigated on 16 stationary phases using the frontal analysis method and coulometric Karl-Fischer titration. The stationary phases include silica gel and silica-bonded phases with different polarities, octadecyl and cholesterol, phenyl
Articles
Polar graphitic carbon enables UHPLC separation of highly polar pesticides, herbicides, and Vitamin D metabolites, advancing liquid chromatography capabilities.
For separation of polar compounds including polar neutrals, polar acids, and polar and non-polar basic amines use our Ascentis® Express HILIC column.
A significantly improved HPLC-fluorescence method for DMB-NANA and -NGNA, and application of this method to compare 2 candidate biosimilar therapeutic proteins to their respective RMs.
This article evaluates different phase chemistries for stationary phases in Hydrophilic Interaction Liquid Chromatography (HILIC) and uses multivariate analysis for classification based on chemical modification.
Protocols
We offer the tools for the analysis of the metabolites; including certified reference standards, enzymes, substrates, and chromatographic products.
Analytical standards for drug analysis including heroin, cocaine, amphetamine, and methylenedioxymethamphetamine.
Related Content
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What flow rate should I use with Ascentis® Express HPLC Columns?
1 answer-
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What is the Department of Transportation shipping information for this product?
1 answer-
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
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Can I use Ascentis Express on any type of HPLC system?
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Ascentis Express HPLC columns are capable of use on standard HPLC systems as well as UHPLC systems. Columns are packed in high pressure hardware capable of withstanding the pressures used in UHPLC systems.
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Would you advise addition of a buffer when using diol or amide stationary phase?
1 answer-
Yes. if possible you should always have at least a small amount of buffer in a HILIC system to help mediate/control IEX and other polar interactions that are bound to be present (even if at a low level). It is not so much the "buffering capacity" that is important, but the presence of the competing ions. We have found that their presence helps with day to day and column to column reproducibility. There are times when you need to eliminate the buffer, but aside from special circumstances, our recommendation is to include them.
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Why is it recommended to run isocratically for HILIC methods?
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When running in HILIC mode, both isocratic and gradient practices result in instability. If you keep the re-equilibration times constant, gradient should not be a problem, but changing this parameter can have a significant impact. It is not so much that it is bad as it is different than we are used to in reversed phase. Usually, we assume that once equilibrated (5, 10, 15 min, etc.), we can leave the system for any time period and come back to the same results. This does not appear to be the case in our studies of HILIC. Knowing that the re-equilibration time has an impact, you should get in the habit of making several injections with known re-equilibration times prior to making any development decisions. To get around this, isocratic runs are recommended. Attached are two posters; the first was presented at HPLC 2013 (Amsterdam) and the second was presented at Balaton Symposium on High Performance Separation Methods 2013 (Hungary). Both show 'reproducibility' at any set re-equilibration time is good but both show that if you change the re-equilibration time; then retention, peak shape and selectivity can change especially where ionic interactions are prevalent.
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Is there anything special I need to do to my HPLC system to use Ascentis Express?
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Nothing special is required to use Ascentis Express HPLC columns. To obtain the full benefits of Ascentis Express, one should minimize dispersion or instrument bandwidth in the HPLC system (tubing, detector flow cell) as well as confirm the detector response system is set at a fast level. For more information, request Guidelines for Optimizing Systems for Ascentis Express Columns (T407102)
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In HILIC separations, what happens if the sample is an aqueous matrix? Does it always have a negative effect?
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Yes, it would be highly preferential (especially in this case where you want partitioning to dominate) to inject in high organic. That said, you can 'get away' with it if the injection volume can be kept small - much like we can inject low volumes of stronger solvents in RP mode, if needed. What you will want to do to minimize impact is to get as much retention on the analytes of interest as you can, this helps give the sample solvent some time to dissipate and negate the effects.
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Can peptide or protein samples be analyzed using HILIC columns?
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Polar peptides are quite amenable to HILIC separations; however, our experience with larger peptides has been only minimally successful - mainly due to solubility issues. Proteins are even more difficult due to the same issue. An additional problem with proteins is that they are often multiply charged. When IEX is performed on multiply charged analytes, you often get what is referred to as a rolling effect where the analyte interacts with ionic sites on the surface in many different ways as it 'rolls' down the column; this produces broad and misshapen peaks.
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How can I measure my instrument bandwidth (IBW) and determine what Ascentis® Express HPLC Columns can be used with minimal efficiency loss created by too much internal instrument volume?
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The Guide to Dispersion Measurement has simple instructions on how to measure IBW and can be found at sigma-aldrich.com/express.
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How does the flow rate influence the water layer on the column?
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We are not aware of any systematic studies with respect to the impact of flow rate on HILIC separations. Our concern would be that as you move to higher flow rates, you might observe peak shape issues due to the slow kinetics of IEX and adsorption mechanisms. If the retention mechanisms for a given system are partition dominated, this should be of less concern. It will be a case by case cause and effect.
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