Cyanopropylphenyl-dimethyl-polysiloxan

The polarity of the solute is crucial for the choice of stationary compound, which in an optimal case would have a similar polarity than the solute. Common stationary phases in open tubular columns are cyanopropylphenyl dimethyl polysiloxane, carbowax polyethyleneglycol, biscyanopropyl cyanopropylphenyl polysiloxane and diphenyl dimethyl polysiloxane. For packed columns there are more options available. 

Di-0-pentyl-3-trifluoroacetyl "y-cyclodextrin 100% Dimethyl polysiloxane Cyanopropylphenyl—dimethyl (14 86) polysiloxane 5% Phenyl—95% methylpolysiloxane... 

Typically, FRs are determined on nonpolar or semipolar columns such as 100% methyl polysiloxane type (DB-1) and 5% phenyl dimethyl polysiloxane type (DB-5, CP-SU 8, and AT-5). Also semipolar phases, such as 8% phenyl-polycarborane-siloxane HT-8, 14% cyanopropylphenyl 86% dimethyl polysiloxane (CP-SU 19, HP-1701, and DB-1701) have been utilized. 

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