gc columns

Enantiomers AnalysisCyclodextrin Columns for Analyzing Many Chiral CompoundsBy adding β or γ cyclodextrin to our bonded Rtx®-1701 stationary phase, we greatlyenhance overall utility and column lifetime for our chiral columns, compared tocolumns that have pure cyclodextrin stationary phases. Separations of more than onehundred chiral compounds have been achieved using our unique DEX columns, andour columns continue to demonstrate stability after hundreds of temperature programcycles. Refer to the applications section of this catalog for examples, or call ourTechnical Service chemists or your Restek representative for assistance in matching acolumn to your chiral analysis.Rt®-βDEXm Columns (fused silica)(permethylated beta cyclodextrin doped into 14% cyanopropylphenyl/86% dimethyl polysiloxane)ID df (µm) temp. limits 30-Meter0.25mm 0.25 40 to 230°C 131000.32mm 0.25 40 to 230°C 13101Uses: General purpose chiral phase with many published applications.Rt®-βDEXsm Columns (fused silica)(2,3-di-O-methyl-6-O-tert-butyl dimethylsilyl beta cyclodextrin doped into 14% cyanopropylphenyl/86% dimethylpolysiloxane)ID df (µm) temp. limits 30-Meter0.25mm 0.25 40 to 230°C 131050.32mm 0.25 40 to 230°C 13104Uses: Excellent column for most chiral compounds in essential oils.Rt®-βDEXse Columns (fused silica)(2,3-di-O-ethyl-6-O-tert-butyl dimethylsilyl beta cyclodextrin doped into 14% cyanopropylphenyl/86% dimethylpolysiloxane)ID df (µm) temp. limits 30-Meter0.25mm 0.25 40 to 230°C 131070.32mm 0.25 40 to 230°C 13106Uses: Similar in performance to Rt-βDEXsm but provides better resolution for limonene, linalool, linalylacetate, ethyl-2-methylbutyrate, 2,3-butane diol, and styrene oxides.Rt®-βDEXsp Columns (fused silica)(2,3-di-O-propyl-6-O-tert-butyl dimethylsilyl beta cyclodextrin doped into 14% cyanopropylphenyl/86% dimethylpolysiloxane)ID df (µm) temp. limits 30-Meter0.25mm 0.25 40 to 230°C 131110.32mm 0.25 40 to 230°C 13110Uses: Often useful in dual-column configurations, with the Rt-βDEXsm column, for complex enantiomericseparations.Rt®-βDEXsa Columns (fused silica)(2,3-di-acetoxy-6-O-tert-butyl dimethylsilyl beta cyclodextrin doped into 14% cyanopropylphenyl/86% dimethylpolysiloxane)ID df (µm) temp. limits 30-Meter0.25mm 0.25 40 to 230°C 131090.32mm 0.25 40 to 230°C 13108Uses: Unique selectivity for esters, lactones, and other fruit flavor components.Rt®-βDEXcst Columns (fused silica)(Proprietary cyclodextrin material doped into 14% cyanopropylphenyl/86% dimethyl polysiloxane)ID df (µm) temp. limits 30-Meter0.25mm 0.25 40 to 230°C 131030.32mm 0.25 40 to 230°C 13102Uses: Proprietary stationary phase, developed specifically for the fragrance industry. Also used forpharmaceutical applications.Rt®-γDEXsa Columns (fused silica)(2,3-di-acetoxy-6-O-tert-butyl dimethylsilyl gamma cyclodextrin doped into 14% cyanopropylphenyl/86% dimethylpolysiloxane)ID df (µm) temp. limits 30-Meter0.25mm 0.25 40 to 230°C 131130.32mm 0.25 40 to 230°C 13112Uses: Larger organic molecules. Also useful for flavor compounds in fruit juices.GC COLUMNS | APPLICATION-SPECIFIC COLUMNSChiral Compoundsplease notefreeliteratureA Guide to the Analysis ofChiral Compounds by GCDownload your free copyfrom www.restek.com.Technical Guidelit. cat.# 59889Application-specific chiral column kits are available!See www.restek.com.tech tipChiral selectivity improves significantly by realizinglower elution temperatures. This can be achieved by:• Faster linear velocities (80cm/sec.) with hydrogencarrier gas.• Slower temperature ramp rates (1–2°C/min.).• Appropriate minimum operating temperature(40 or 60°C).• On-column concentrations of 50ng or less.freeliteratureGrape Flavor Analysis,Using an Rt ® -γDEXsa GCColumnApplications Notelit. cat.# 59553GC Analysis of ChiralFlavor Compounds inApple Juices, UsingRt ® -βDEXsm andRt ® -βDEXse ColumnsApplications Notelit. cat.# 59546Download your freecopies fromwww.restek.com.www.restek.com 63