Ultra Aqueous C18 Columns

Ultra Aqueous C18 Columns
 4.5/5.0 (7 reviews)

Restek Corp.

The Ultra line represents Restek’s broadest selection of stationary phases on a single silica support. Made of high-purity, type-B silica that minimizes activity and creates high-density bonding, th...read more

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Reviews

Hakan Çiftçi


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Member since 2013

Organization:
Kirikkale University
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RATING: 5.0

  • 5 out of 5EASE OF USE
  • 5 out of 5AFTER SALES SERVICE
  • 5 out of 5VALUE FOR MONEY




Review date: 10 Jul 2013

Application Area: Separation
Ultra Aqueous C18 Columns

"Very easy to use and productive."

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James Barnes


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Member since 2013

Organization:
University Multispectral Laboratories
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RATING: 4.3

  • 5 out of 5EASE OF USE
  • 4 out of 5AFTER SALES SERVICE
  • 4 out of 5VALUE FOR MONEY




Review date: 28 May 2013

Application Area: Food Analysis
Ultra Aqueous C18 Columns

"Good reproducibility and peak shape. I switched from an instrument manufacturer's columns to Restek with no degradation in performance. I would definitely recommend in the future."

Cris Lewis


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Member since 2013

Organization:
University Multispectral Laboratories
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RATING: 4.0

  • 4 out of 5EASE OF USE
  • 4 out of 5AFTER SALES SERVICE
  • 4 out of 5VALUE FOR MONEY




Review date: 28 May 2013

Application Area: Environmental analysis
Ultra Aqueous C18 Columns

"We use these now in our laboratory, instead of another product from the same manufacturer as our HPLC. They work great, no problems with reproducibility or peak shape."

Daniel Finnen


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Member since 2013

Organization:
Shawnee State University
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RATING: 5.0

  • 5 out of 5EASE OF USE
  • 5 out of 5AFTER SALES SERVICE
  • 5 out of 5VALUE FOR MONEY




Review date: 18 Mar 2013

Application Area: undergraduate research
Ultra Aqueous C18 Columns

"The columns were excellent for separating the components in solutions such as whisky's and craft beers. The resolution was great and the reproducibility was consistent."

HAIYAN SHAO


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Member since 2009

Organization:
IMPAX LABORATORIES
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RATING: 5.0

  • 5 out of 5EASE OF USE
  • 5 out of 5AFTER SALES SERVICE
  • 5 out of 5VALUE FOR MONEY




Review date: 16 Feb 2012

Application Area: pharmaceutical
Ultra Aqueous C18 Columns

"Best retention as tested among different vendors in the catagory of aqueous columns so far."

Nicole Schechter


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Member since 2010

Organization:
University of Arizona
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RATING: 4.0

  • 4 out of 5EASE OF USE
  • 4 out of 5AFTER SALES SERVICE
  • 4 out of 5VALUE FOR MONEY




Review date: 16 Feb 2012

Application Area: chemistry
Ultra Aqueous C18 Columns

"Great columns for use in drug discovery and development. The vendor has a huge catalog that is a bit intimidating, but the selection was perfect for our needs."

Jamesa Hogges


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Member since 2011

Organization:
Mercer University
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RATING: 4.3

  • 5 out of 5EASE OF USE
  • 4 out of 5AFTER SALES SERVICE
  • 4 out of 5VALUE FOR MONEY




Review date: 25 May 2011

Ultra Aqueous C18 Columns

"Great separation. Gives good results! Highly recommended."

Description

 

The Ultra line represents Restek’s broadest selection of stationary phases on a single silica support. Made of high-purity, type-B silica that minimizes activity and creates high-density bonding, these columns are designed for selective and reliable HPLC applications.

The Ultra Aqueous C18 HPLC column provides reproducible retention times and can be used with highly aqueous mobile phases, which may eliminate the need for sample derivitization or ion pairing reagents. This column features a true C18 alkyl bonded phase, meeting the requirements of a US Pharmacopoeia (USP) L1 stationary phase.

The Ultra Aqueous C18 column uses a novel bonding chemistry that results in polar groups at the silica surface. These surface polar groups keep the alkyl stationary phase extended, and thus wetted by the mobile phase—even when using up to 100% aqueous mobile phases.

Additionally, although the Ultra Aqueous C18 column behaves similarly to a traditional base-deactivated C18 column when analyzing neutral hydrophobic compounds, it has enhanced retention and unique selectivity for polar and basic compounds.


Ultra Aqueous C18 Columns Features:

  • Analyzes polar compounds by reversed phase.
  • Retains compounds such as amino acids and water soluble vitamins using simple mobile phases and without derivitization.
  • Analyzes polar, hydrophillic materials without retention time loss. Stable retention in 100% aqueous mobile phases.
  • Can analyze compounds that are sparingly soluble in organic solvents.
  • True C18 alkyl bonded phase.
  • High-density C18 ligand coverage.
  • Similar selectivity as traditional C18 phases for neutral hydrophobic compounds.
  • Unique secondary polar characteristics.
  • End-capping diminishes peak tailing observed from exposed silanol sites on the silica surface.

Column Characteristics:

  • Phase: C18
  • particle Size: 3, 5 μm
  • Pore Size: 100 Å
  • Length: 30, 50, 100, 150, 200, 250 mm
  • ID: 0.3, 1.0, 2.1, 3.0, 3.2, 4.6 mm

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