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gas chromatography gc columns | capillary Alltech Column Guide to EPA Methods (continued) Alltech Guide to Capillary Columns for Environmental Analysis (continued) Method Description and Recommended Columns Comments Part No. 8015—Nonhalogenated Volatile Organics Heliflex ® AT-WAX, 30m x 0.53mm x 1.00μm 13907 Heliflex ® AT-5, 30m x 0.53mm x 1.50μm 13909 8021—Halogenated Volatiles Using GC/PID/ELCD Heliflex ® AT-20, 60m x 0.53mm x 1.20μm 13933 8032—Acrylamide by GC/ECD Heliflex ® AT-1000, 15m x 0.53mm x 1.20μm 975115 8033—Acetonitrile by GC/NPD Heliflex ® AT-WAX, 15m x 0.53mm x 1.00μm 13904 8041—Phenols by GC/FID/(ECD) Heliflex ® AT-5, 30m x 0.53mm x 1.50μm 13909 Heliflex ® AT-1701, 30m x 0.53mm x 1.00μm 13795 8070—Nitrosamines Heliflex ® AT-5, 15m x 0.53mm x 1.20μm 955115 Econo-Cap EC-5, 15m x 0.53mm x 1.20μm (Inexpensive, Batch QC’ed Column) 19645 8081—Organochlorine Pesticides by GC/ECD Heliflex ® AT-5, 30m x 0.25mm x 1.00μm 13657 Heliflex ® AT-35, 30m x 0.25mm x 1.00μm 13796 Heliflex ® AT-35, 30m x 0.53mm x 0.50μm 13797 Heliflex ® AT-1701, 30m x 0.53mm x 1.00μm 13795 Heliflex ® AT-5, 30m x 0.53mm x 1.50μm 13909 Heliflex ® AT-Pesticide, 30m x 0.53mm x 0.60μm 13969 8082—Polychlorinated Biphenyls (PCBs) by GC/ECD or GC/ELCD Heliflex ® AT-5, 30m x 0.25mm x 1.00μm 13657 Heliflex ® AT-35, 30m x 0.25mm x 1.00μm 13796 Heliflex ® AT-35, 30m x 0.53mm x 0.50μm 13797 Heliflex ® AT-1701, 30m x 0.53mm x 1.00μm 13795 Heliflex ® AT-5, 30m x 0.53mm x 1.50μm 13909 Heliflex ® AT-Pesticide, 30m x 0.53mm x 0.60μm 13969 8091—Nitroaromatics and Cyclic Ketones by GC/ECD or GC/NPD Heliflex ® AT-5, 30m x 0.53mm x 1.50μm 13909 Heliflex ® AT-1701, 30m x 0.53mm x 1.00μm 13795 8100—Polynuclear Aromatic Hydrocarbons by GC/FID Heliflex ® AT-5, 30m x 0.53mm x 1.20μm 955130 Econo-Cap EC-5, 30m x 0.53mm x 1.20μm (Inexpensive, Batch QC’ed Column) 19657 Heliflex ® AT-5, 30m x 0.32mm x 0.25μm 13658 Econo-Cap EC-5, 30m x 0.32mm x 0.25μm (Inexpensive, Batch QC’ed Column) 19646 Heliflex ® AT-5, 30m x 0.25mm x 0.25μm 13656 Econo-Cap EC-5, 30m x 0.25mm x 0.25μm (Inexpensive, Batch QC’ed Column) 19647 8111—Haloethers by GC/ECD Heliflex ® AT-5, 30m x 0.53mm x 1.50μm 13909 Heliflex ® AT-1701, 30m x 0.53mm x 1.20μm 13830 8141—Organophosphorus Pesticides by GC/NPD/FPD/ELCD Heliflex ® AT-210, 15m x 0.53mm x 1.20μm Column 1 985115 Heliflex ® AT-5, 15m x 0.53mm x 1.20μm Column 2 955115 Econo-Cap EC-5, 15m x 0.53mm x 1.20μm (Inexpensive, Batch QC’ed Column) 19645 8151—Chlorinated Herbicides by GC/ECD Using Methylation and Pentafluorobenzylation Derivatization Heliflex ® AT-5, 30m x 0.25mm x 0.25μm 13656 Heliflex ® AT-5, 30m x 0.32mm x 1.00μm 13659 Heliflex ® AT-35, 30m x 0.25mm x 0.25μm 13642 Heliflex ® AT-1701, 30m x 0.25mm x 0.25μm 13686 Heliflex ® AT-1701, 30m x 0.53mm x 1.00μm 13795 Heliflex ® AT-Pesticide, 30m x 0.53mm x 0.60μm 13969 8260—Volatile Organics by GC/MS: Capillary Column Technique Heliflex ® AT-624, 30m x 0.53mm x 3.00μm Subambient (10°C) 16889 Heliflex ® AT-624, 60m x 0.53mm x 3.00μm Ambient 13800 Heliflex ® AT-5, 30m x 0.32mm x 1.00μm Subambient, Cryofocusing 13659 Heliflex ® AT-5, 30m x 0.25mm x 1.00μm Subambient, Cryofocusing 13657 Heliflex ® AT-502.2, 60m x 0.53mm x 3.00μm Ambient 13793 Heliflex ® AT-502.2, 105m x 0.53mm x 3.00μm Ambient 13794 234 www.discoverysciences.com
gas chromatography Astec Chiraldex ® GC Capillary Columns • Resolve aromatic and nonaromatic enantiomers • Pure cyclodextrin derivative coating • No racemization of chiral stationary phase at elevated temperatures Chiraldex ® capillaries are based on derivatized cyclodextrins, which are chiral in nature formed by the -1,4 linkage of glucose units into toroidal shaped structures. The enzyme cyclodextrin glucosyl transferance (CGT) cleaves partially digested starch and links the glucose units into predominantly three forms, referred to as alpha, beta, and gamma; 6, 7, and 8 glucose units, respectively. These cyclodextrins are thermally stable, highly crystalline and virtually insoluble in most organic solvents. Using the three forms of cyclodextrin, Astec has manufactured derivatives that exhibit properties allowing them to be used as GC phases. They are: – Permethylated Hydroxypropyl (PH) – Dialkylated (DA) – Trifluoroacetylated (TA) – Propionylated (PN) – Butyrylated (BP) – Permethylated (PM) – Dimethylated (DM) – Dipropionyl (DP) The prefix A, B, G describes the cyclodextrins alpha, beta, and gamma, respectively. The suffix describes the nature of the derivatization i.e., G-TA refers to Gamma Trifluororacetylated phase. The most striking characteristic of these phases is that they separate nonaromatic enantiomers including saturated alcohols, amines, carboxylic acids, epoxides, diols, polyols, cyclic, bicyclic, heterocyclic compounds, lactones, amino alcohols, amino acids, halohydrocarbons, -halocarboxylic esters, pyrans, and furans. Little functionality is required for chiral recognition (Table 1). Also, there can be reversals of elution order from one series to the next as well as from one cavity size (beta) to another (gamma). The acylating reagent also can contribute to stereo-selectivity. technical assistance Contact Tech Support: Phone: 1.800.255.8324 (North America) Email: contact.alltech@grace.com Online: www.discoverysciences.com Table 1—General Classes of Compounds Separated on Chiraldex Capillary Columns Chiraldex ® A-PH: Smaller linear and saturated amines, alcohols, carboxylic acids, and epoxides Chiraldex ® B-PH: Most structural types of compounds including linear and cyclic amines and alcohols, carboxylic acids, lactones, amino alcohols, sugars, bicyclics, epoxides, haloalkanes, and more Chiraldex ® G-PH: Cyclic and bicyclic diols and other larger compounds including steroids and carbohydrates Chiraldex ® A-DA: Smaller cyclic amines, alcohols, and epoxides (Inquire regarding availability) Chiraldex ® B-DA: Nitrogen heterocyclics, heterocyclics, some bicyclics, and epoxides, lactones, aromatic amines, sugars, amino acid derivatives Chiraldex ® G-DA: Aromatic amines containing 2 or more rings, large cyclic diols, some heterocyclics, multi-ring compounds or compounds with bulky substituents Chiraldex ® A-TA: Smaller alcohols, amino alcohols, amino alkanes, and diols Chiraldex ® B-TA: Broad range alkyl alcohols, halo acid esters, amino alkanes, halocycloalkanes, certain lactones, diols, alkyl halides, furan and pyran derivatives Chiraldex ® G-TA: >350 pairs chiral alcohols, diols, polyols, hydrocarbons, lactones, amine alcohols, halocarboxylic acid esters, homologous series, furan and pyran derivatives, epoxides, glycidyl analogs, and haloepihydrins Chiraldex ® G-PN: Epoxides, higher alcohols >C4, lactones Chiraldex ® G-BP: Amino acids, certain primary amines and furans Chiraldex ® G-DM: Selectivity similar to PM and PH, but with shorter retention times, and greater resolution. Especially applicable to aliphatic, olefenic, and aromatic enantiomers Chiraldex ® B-PM: Acids, alcohols, barbitals, diols, epoxides, esters, hydrocarbons, ketones, lactones, and terpenes Chiraldex ® B-DM: Selectivity similar to PM and PH, but with shorter retention times, and greater resolution. Especially applicable to aliphatic, olefenic, and aromatic enantiomers Chiraldex ® B-DP: Aromatic and aliphatic amines and some aliphatic and aromatic esters Chiraldex ® G-DP: Aromatic and aliphatic amines and some aliphatic and aromatic esters gc columns | capillary www.discoverysciences.com 235
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