Restek-2015

100 / 628

98
GC COLUMNS | APPLICATION-SPECIFIC COLUMNS
Specially Deactivated
Acidic Compounds Analysis
crossbond® technology
Reduces bleed, prolongs column lifetime, and
allows rejuvenation through solvent rinsing.
Underivatized Alcoholic Beverage Acids and Methyl Esters on Stabilwax®-DA
1
2
3
4 5
6
7
8
9
10
11
12
13
14
15 16
17
3 4 5 6 7 8 9
Time (min)
11 10 12 13 14 15
GC_FF00500
Column Stabilwax®-DA, 30 m, 0.18 mm ID, 0.18 µm (cat.# 550752)
Sample
Diluent: Ethyl acetate
Injection
Inj. Vol.: 1 µL splitless (hold 0.5 min)
Liner: Splitless (4 mm ID) w/glass wool (cat.# 20814-202.1)
Inj. Temp.: 240 °C
Oven
Oven Temp.: 70 °C to 240 °C at 12 °C/min (hold 3 min)
Carrier Gas H2, constant linear velocity
Linear Velocity: 28 psi, 193.1 kPa @ 240 °C
Detector FID
Make-up Gas
Type: N2
Peaks Conc.
(µg/mL)
1. Ethyl octanoate 100
2. Acetic acid 100
3. Propionic acid 100
4. Isobutyric acid 100
5. 3-Decanol 50
6. Ethyl decanoate 50
7. Ethyl laurate 50
8. cis-Lactone 100
9. 2-Phenylethanol 50
10. trans-Lactone 100
11. Methyl myristate 50
12. Ethyl myristate 50
13. Octanoic acid 100
14. Ethyl palmitate 50
15. Decanoic acid 100
16. Dodecanoic acid 100
17. Vanillin 100
please note
Stabilwax®-DA columns should not be rinsed
with water.
Stabilwax®-DA Columns (fused silica)
(polar phase; Crossbond® acid-deactivated Carbowax® polyethylene glycol—for acidic compounds)
• Application-specific columns for free (underivatized) acids, some inorganic acids.
• Resistant to oxidative damage.
• Temperature range: 40 °C to 260 °C.
• Equivalent to USP G25, G35 phases.
Stabilwax®-DA bonded polyethylene glycol has an acidic functionality incorporated
into the polymer structure. This permits analysis of acidic compounds without de-
rivatization, significantly reduces adsorption of acids, and increases sample capacity
for volatile free acids. Stabilwax®-DA columns last longer and give better peak shapes
for high molecular weight acids.
Some inorganic acids also chromatograph well on a Stabilwax®-DA column; the limita-
tion is the volatility of the acidic compound.
similar phases
HP-FFAP, DB-FFAP, CP-WAX 58 FFAP CB,
NUKOL, ZB-FFAP
15-Meter 30-Meter 60-Meter
ID df temp. limits cat.# price cat.# price cat.# price
0.25 mm 0.10 µm 40 to 250/260 °C 11005 11008
0.25 µm 40 to 250/260 °C 11020 11023 11026
0.50 µm 40 to 250/260 °C 11035 11038 11041
0.32 mm 0.10 µm 40 to 250/260 °C 11009
0.25 µm 40 to 250/260 °C 11021 11024 11027
0.50 µm 40 to 250/260 °C 11036 11039 11042
1.00 µm 40 to 240/250 °C 11051 11054 11057
0.53 mm 0.10 µm 40 to 250/260 °C 11007
0.25 µm 40 to 250/260 °C 11022 11025
0.50 µm 40 to 250/260 °C 11037 11040
1.00 µm 40 to 240/250 °C 11052 11055 11058
1.50 µm 40 to 230/240 °C 11062 11065 11068