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GC COLUMNSFUSED SILICA COLUMNSSelecting a GC Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23-27GC Column Cross-References . . . . . . . . . . . . . . . . . . . . . . . . .28-29GC Column Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30Guard/Retention Gap Columns . . . . . . . . . . . . . . . . . . 31-35High-Performance Rxi Columns . . . . . . . . . . . . . . . . . .36-47General Purpose Columns . . . . . . . . . . . . . . . . . . . . . . .48-59Fast GC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60Comprehensive GC Columns . . . . . . . . . . . . . . . . . . . . . . . .61Application-Specific ColumnsSpecially Deactivated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63-67Chiral Compounds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68Foods, Flavors & Fragrances . . . . . . . . . . . . . . . . . . . . . . . . .69-73Petroleum & Petrochemical . . . . . . . . . . . . . . . . . . . . . . . . .74-81Clinical, Forensic & Toxicology . . . . . . . . . . . . . . . . . . . . . . . . . .82Pharmaceutical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83-86Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87-103What’sNEW?look for thiscircleWebsite : www.chromtech.net.au E-mail : info@chromtech.net.au TelNo : 03 9762 2034 . . . in AUSTRALIA Mar 2011
GC COLUMNS | CAPILLARY COLUMNSSelecting a GC ColumnSelecting a GC ColumnStrategic column choices can improve lab productivity by assuring that speed andresolution are optimized. While the number of choices available can be daunting,consideration of the resolution equation variables—selectivity, retention (capacity),and efficiency—simplifies the decision. Selectivity determines which stationary phase ismost appropriate, and it can be approximated using retention indices or existing applications.Once the phase has been chosen, physical dimensions (internal diameter, filmthickness, length) can be selected based on retention and efficiency. Understanding howselectivity, retention, and efficiency influence separations allows analysts to makeeffective, informed choices and quickly select the best column for specific separations.1 L k α-1R =4 HXk+1XαEfficiencyRetentionSelectivityR = resolutionL = column lengthH = HETPk = capacity factorα = selectivitySelectivity, αThe selectivity of the capillary column is directly related to how the analyte moleculeinteracts with the stationary phase being considered. If the analyte strongly interactswith the stationary phase, it can be said that strong intermolecular forces exist. Theseintermolecular forces of attraction between the analyte and the stationary phase are afunction of the structure of both the analyte molecule and the stationary phase. If thesetwo structures are similar, then the attractive forces are strong. If they are dissimilar,then analyte to stationary phase attraction is weak, and less retention is observed.Therefore, when selecting a stationary phase, knowledge of the structure of the analytesof interest and the stationary phase is crucial. The reference table on page 27 providesthe chemical structure of Restek’s most common stationary phases.An example of selectivity can be shown using benzene and butanol (both have nearlythe same boiling point) eluting through the 20% diphenyl/80% dimethyl polysiloxanestationary phase (Rtx®-20). The benzene molecule will dissolve into the stationaryphase more readily than the butanol based on the concept that “likes dissolve likes”.Since benzene solvates more readily with the stationary phase, it has more interactionswith the stationary phase as it elutes through the column. Therefore, the elution orderof these two compounds on the Rtx®-20 stationary phase will be butanol first andbenzene second.ChromaBLOGraphyTopical and timely insights from topchromatographers.Visit us at blog.restek.comAs methyl groups are replaced by different functionalities such as phenyl or cyanopropylpendant groups, the selectivity of the column shifts towards compounds that will havea better solubility in the stationary phase. For example the Rtx®-200 stationary phaseprovides high selectivity for analytes containing lone pair electrons, such as halogens,nitrogen, or carbonyl groups. Polyethylene glycol <strong>columns</strong>, such as the Stabilwax® andRtx®-Wax <strong>columns</strong> are highly selective towards polar compounds such as alcohols.Again using the example above, the butanol more readily solvates into the polyethyleneglycol stationary phase; therefore, the butanol will have more interaction with the phaseand elute after benzene.www.restek.com 23Website : www.chromtech.net.au E-mail : info@chromtech.net.au TelNo : 03 9762 2034 . . . in AUSTRALIA Mar 2011
Page 5: GC COLUMNSDetailed Table of Content
Page 9 and 10: GC COLUMNS | CAPILLARY COLUMNSSelec
Page 11 and 12: GC COLUMNS | CAPILLARY COLUMNSSelec
Page 13 and 14: Columns by Application/IndustryRtx-
Page 15 and 16: GC COLUMNS | CAPILLARY COLUMNSGuard
Page 17 and 18: GC COLUMNS | CAPILLARY COLUMNSFused
Page 19 and 20: GC COLUMNS | CAPILLARY COLUMNSFused
Page 21 and 22: 3-IN-1 TECHNOLOGYHighest Inertness
Page 23 and 24: GC COLUMNS | HIGH-PERFORMANCE RXI C
Page 25 and 26: Rxi®-1ms Columns (fused silica)(no
Page 29 and 30: GC COLUMNS | HIGH-PERFORMANCE RXI C
Page 31 and 32: NEW!GC COLUMNS | HIGH-PERFORMANCE R
Page 33 and 34: GC COLUMNS | GENERAL PURPOSE COLUMN
Page 41 and 42: Rt®-2330 Columns (fused silica)(hi
Page 45 and 46: GCxGC Second Dimension Selectivity
Page 47 and 48: Basic Compounds AnalysisRtx®-Volat
Page 49 and 50: Basic Compounds AnalysisRtx®-35 Am
Page 51 and 52: Acidic Compounds AnalysisStabilwax
Page 53 and 54: cis/trans FAMEsRt®-2560 Column (fu
Page 55 and 56: Flavor & Fragrance Compounds Analys
Page 57 and 58:
PAHs in Foods AnalysisRxi®-17Sil M
Page 59 and 60:
Detailed Hydrocarbon Analysis (DHA)
Page 61 and 62:
Simulated Distillation (C5-C44) Ana
Page 63 and 64:
GC COLUMNS | APPLICATION-SPECIFIC C
Page 65 and 66:
Biodiesel Fuels AnalysisMXT®-Biodi
Page 67 and 68:
Organic Volatile Impurities (OVI) A
Page 69 and 70:
Organic Volatile Impurities (OVI) A
Page 71 and 72:
Semivolatiles AnalysisRxi®-5Sil MS
Page 73 and 74:
Chlorinated Pesticides AnalysisGC C
Page 75 and 76:
Organophosphorus Pesticides Analysi
Page 77 and 78:
PCB Congeners AnalysisRtx®-PCB Col
Page 79 and 80:
Dioxin & Furan Congeners AnalysisRx
Page 81 and 82:
Polycyclic Aromatic Hydrocarbon (PA
Page 83 and 84:
Mineral Oil AnalysisRtx®-Mineral O
Page 85 and 86:
Volatile Organics AnalysisRtx®-VRX
Page 87 and 88:
Volatile Organics AnalysisRxi®-624
Page 89 and 90:
Next Generation GC PLOT Columns•
Page 91 and 92:
GC COLUMNS | PLOT COLUMNSPLOT Colum
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GC COLUMNS | PLOT COLUMNSMolecular
Page 95 and 96:
GC COLUMNS | PLOT COLUMNSPorous Pol
Page 97 and 98:
What is an MXT® column?MXT® colum
Page 99 and 100:
GC COLUMNS | METAL (MXT®) CAPILLAR
Page 101 and 102:
GC COLUMNS | METAL (MXT®) CAPILLAR
Page 103 and 104:
Triglycerides in Foods AnalysisMXT
Page 105 and 106:
Volatile Organics AnalysisMXT®-502
Page 107 and 108:
Bonded Stationary PhasesWe combined
Page 109 and 110:
Packed Column TubingRestek offers a
Page 111 and 112:
GC COLUMNS | PACKED/MICROPACKED COL
Page 113 and 114:
Light Hydrocarbon AnalysisSpecial C
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Sulfur AnalysisRt®-XLSulfur Packed
Page 117 and 118:
Packed Column Inlet Adaptor Kits•
Page 119 and 120:
Res-Sil® Packing Materials• Uniq
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Custom Packed ColumnsTo order, spec
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