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Rtx-225

(Crossbond® 50% cyanopropylmethyl/50% phenylmethyl polysiloxane)GC column

  • Polar phase.
  • Equivalent to USP G7, G19 phase.

The cyanopropyl-containing Rtx®-225 phase is slightly less polar than bonded polyethylene glycol (PEG) phases, but it can be used for many of the same applications. Some popular applications for the Rtx®-225 column are analyses of fatty acid methyl esters (FAMES), sugar derivatives, and food and flavor compounds.

Improvements to the Rtx®-225 polymer have increased thermal stability, reduced bleed, and improved inertness. The Rtx®-225 column provides a 20°C thermal stability advantage over other “225” columns because of an unique polymer synthesis technology and proprietary siloxane deactivation. In most similar columns, the Carbowax® deactivation layer is not fully compatible with the cyanopropyl siloxane polymer, which can cause adsorption, tailing of active compounds, and lower efficiency.

Applications
  • FAMEs
  • Carbohydrates derivetes
  • Sterols
  • Flavor compounds
Temperature limits
ID (mm) df(µm) Temperature limits (°C)
0.25 0.10 40 to 220/240
0.25 0.25 40 to 220/240
0.25 0.50 40 to 220/240
0.32 0.10 40 to 220/240
0.32 0.25 40 to 220/240
0.32 0.50 40 to 220/240
0.32 1.00 40 to 200/220
0.53 0.10 40 to 200/220
0.53 0.25 40 to 200/220
0.53 0.50 40 to 200/220
0.53 1.00 40 to 200/220