98
www.restek.comGC 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
H
2
, constant linear velocity
Linear Velocity:
28 psi, 193.1 kPa @ 240 °C
Detector
FID
Make-up Gas
Type:
N
2
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