Gas Chromatography (GC) (IUPAC Compendium of Chemical Terminology):

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Lecture 3. Gas chromathography. Intermediate polarity to strongly polar stationary phases. BONDED PHASE Temp °C GENERAL USE OF PHASE Methyl 7% Cyanopropyl 7% Phenyl Polysiloxane CN CH 3 * O Si O Si * X CH 3 Y 280 Intermediate polarity. Unique selectivity of cyanopropyl and phenyl groups provide efficient separations of derivitized sugars and many environmental samples. Not truly a polar phase. Good thermal stability Methyl 25% Cyanopropyl 25% Phenyl Polysiloxane CN CH 3 * O Si O Si * X CH 3 Y 40-240 Polar. Optima 225 Provides efficient separations of polar molecules such as fatty acids and alditol acetate derivatives of sugars. Fair thermal stability. 50% Trifluoropropyl 50% Methyl polysiloxane * CF 3 CH 3 Si O Si Y X * CH 3 CF 3 Polyethylene Glycol * CH 2 CH 2 O * n 40-300 20-260 Polar. Optima 210 Selectivity for compounds with lone pair electrons or carbonyl groups. Retains oxygenated compounds in the order ether, hydroxy, ester and keto Widely used as a confirmatory phase for chlorinated pesticides. Also suitable for PCB’s, phenols and nitroaromatics. Good thermal stability. Carbowax 20M is a polyethylene glycol phase which demonstrates unique selectivity hydrogen bonding-type molecules. Particularly useful for the analysis of complex oxygenated samples but is susceptible to oxygen degradation. Not recommended for the analysis of mixtures containing silylating reagents 10
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Gas Chromatography (GC) (IUPAC Compendium of Chemical Terminology):

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