Products & ReviewSeparations

Ascentis® Express F5 HPLC Columns

The pentafluorophenylpropyl (PFP) stationary phase of Ascentis® Express F5 provides a stable, reversed-phase packing with electron-deficient phenyl rings due to the presence of electronegative fluorines. In addition to forming p-p and mildly steric interactions, F5 phases also retain compounds by polar interactions. As a result of having both polar and non-polar character, F5 phases can show dual-mode retention behavior, some…

Sigma-Aldrich Supelco

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Description

The pentafluorophenylpropyl (PFP) stationary phase of Ascentis® Express F5 provides a stable, reversed-phase packing with electron-deficient phenyl rings due to the presence of electronegative fluorines.

In addition to forming p-p and mildly steric interactions, F5 phases also retain compounds by polar interactions. As a result of having both polar and non-polar character, F5 phases can show dual-mode retention behavior, sometimes producing a “U-shaped” retention as a function of acetonitrile content of the mobile phase, with retention increasing at both low and high concentrations of ACN (reversed-phase and HILIC retention modes). Ascentis Express F5 can be used for basic, acidic, or neutral compounds with alternate selectivity from C18.

Column Details:

  • Chemistry: Reversed Phase, Hydrophilic Interaction
  • Particle Size: 2.7, 5.0 μm
  • Pore Size: 90 Å
  • Length: 20, 30, 50, 75, 100, 150, 250 mm
  • ID: 2.1, 3.0, 4.6 mm
Application NoteSeparations

Method Optimization for LC-MS Analysis of Vitamin D Metabolite Critical Pairs in Serum

Analysis of vitamin D metabolites has continued to be a topic of interest in recent publications, primarily as biomarkers for possible disease states and vitamin deficiency. There is also an interest in analytical means to differentiate the D2 and D3 forms from the D2 and D3 epimers because of their different degrees of bioactivity. Ascentis® Express F5 gives a fast and efficient analytical method for 25-hydroxyvitamin D and related forms from serum samples.


Application NoteSeparations

Metabolomic Profiling of <em>Neurospora crassa</em> Fungus Using HILIC and Reversed-Phase LC-MS

Much is known regarding the genome of Neurospora crassa, specifically in the determination of circadian rhythms. However, little is known regarding how the metabolome changes over the course of the day under control of the circadian clock. Profiling metabolic changes in biological samples can be a complex and tedious task. The use of the high-resolution Ascentis® Express HPLC columns greatly aids in the resolution of components in even the most complex sample matrix.

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