68 www.restek.com
free
literature
Grape Flavor
Analysis, Using an
Rt®-
γ
DEXsa GC
Column
lit. cat.# 59553
GC Analysis of Chiral
Flavor Compounds in
Apple Juices, Using
Rt®-
β
DEXsm and
Rt®-
β
DEXse Columns
lit. cat.# 59546
Download your free
copies from
www.restek.com
free
literature
A Guide to the
Analysis of Chiral
Compounds by GC
Download your free
copy from
www.restek.com
lit. cat.# 59889
please
note
Application-specific chiral column kits are
available! See
www.restek.com
Chiral selectivity improves significantly by
realizing lower elution temperatures.
This can be achieved by:
• Faster linear velocities (80 cm/sec.) with
hydrogen carrier gas.
• Slower temperature ramp rates (1–2 °C/min.).
• Appropriate minimum operating
temperature (40 or 60 °C).
• On-column concentrations of 50 ng or less.
tech
tip
Rt®-
β
DEXm Columns
(fused silica)
(permethylated beta cyclodextrin doped into 14% cyanopropylphenyl/86% dimethyl polysiloxane)
Uses: General purpose chiral phase with many published applications.
Cyclodextrin Columns for Analyzing Many Chiral Compounds
By adding
β
or
γ
cyclodextrin to our bonded Rtx®-1701 stationary phase, we greatly
enhance overall utility and column lifetime for our chiral columns, compared to
columns that have pure cyclodextrin stationary phases. Separations of more than one
hundred chiral compounds have been achieved using our unique DEX columns, and
our columns continue to demonstrate stability after hundreds of temperature program
cycles.
Rt®-
β
DEXsm Columns
(fused silica)
(2,3-di-O-methyl-6-O-tert-butyl dimethylsilyl beta cyclodextrin doped into 14%
cyanopropylphenyl/86% dimethyl polysiloxane)
Uses: Excellent column for most chiral compounds in essential oils.
Rt®-
β
DEXse Columns
(fused silica)
(2,3-di-O-ethyl-6-O-tert-butyl dimethylsilyl beta cyclodextrin doped into 14%
cyanopropylphenyl/86% dimethyl polysiloxane)
Uses: Similar in performance to Rt-
β
DEXsm but provides better resolution for limonene, linalool, linalyl
acetate, ethyl-2-methylbutyrate, 2,3-butane diol, and styrene oxides.
Rt®-
β
DEXsp Columns
(fused silica)
(2,3-di-O-propyl-6-O-tert-butyl dimethylsilyl beta cyclodextrin doped into 14%
cyanopropylphenyl/86% dimethyl polysiloxane)
Uses: Often useful in dual-column configurations, with the Rt-
β
DEXsm column, for complex enantiomeric
separations.
Rt®-
β
DEXsa Columns
(fused silica)
(2,3-di-acetoxy-6-O-tert-butyl dimethylsilyl beta cyclodextrin doped into 14%
cyanopropylphenyl/86% dimethyl polysiloxane)
Uses: Unique selectivity for esters, lactones, and other fruit flavor components.
Rt®-
β
DEXcst Columns
(fused silica)
(Proprietary cyclodextrin material doped into 14% cyanopropylphenyl/86% dimethyl polysiloxane)
Uses: Proprietary stationary phase, developed specifically for the fragrance industry. Also used for
pharmaceutical applications.
Rt®-
γ
DEXsa Columns
(fused silica)
(2,3-di-acetoxy-6-O-tert-butyl dimethylsilyl gamma cyclodextrin doped into 14%
cyanopropylphenyl/86% dimethyl polysiloxane)
Uses: Larger organic molecules. Also useful for flavor compounds in fruit juices.
ID
df
temp. limits
30-Meter
0.25mm
0.25µm
40 to 230°C
13100
0.32mm 0.25µm
40 to 230°C
13101
ID
df
temp. limits
30-Meter
0.25mm
0.25µm
40 to 230°C
13105
0.32mm 0.25µm
40 to 230°C
13104
ID
df
temp. limits
30-Meter
0.25mm
0.25µm
40 to 230°C
13107
0.32mm 0.25µm
40 to 230°C
13106
ID
df
temp. limits
30-Meter
0.25mm
0.25µm
40 to 230°C
13111
0.32mm 0.25µm
40 to 230°C
13110
ID
df
temp. limits
30-Meter
0.25mm
0.25µm
40 to 230°C
13109
0.32mm 0.25µm
40 to 230°C
13108
ID
df
temp. limits
30-Meter
0.25mm
0.25µm
40 to 230°C
13103
0.32mm 0.25µm
40 to 230°C
13102
ID
df
temp. limits
30-Meter
0.25mm
0.25µm
40 to 230°C
13113
0.32mm 0.25µm
40 to 230°C
13112
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