Figure1
Rxi™-5ms columnsprovideexcellent sensitivityand symmetry for difficult compounds.
TheUltimateHighPerformanceFusedSilicaCapillaryColumn
TheRestek research chemists have developednew technology formakingGC capillary columns, includingnew
deactivation chemistry, newpolymer synthesis routes, and anewmanufacturingprocess. The overall results of
these efforts are columns demonstratingunsurpassed inertness, ultra-lowbleed, and totally reliable column-to-
columnperformance.
Excellent Inertness
Many acidic andbasic compounds require the inertness of Rxi™-5ms columns.Weuse 2,4-dinitrophenol (acidic)
andpyridine (basic) to evaluate the inertness of our columns. Surface activity in the column is revealedby the
peak shapes for these analytes, and sub-nanogram test quantitiesmake for a stringent test.The data below show
the peak response for 0.5ngof pyridine and0.5ngof 2,4-dinitrophenol on anRxi™-5ms, 30m x 0.25mm, 0.25µm
film column.Rxi™-5ms columns' excellent inertness allows acidic or basic compounds tobe analyzedunder the
same conditions.
UltraLowBleed
Bleed fromRxi™-5ms columns is negligible, simplifying trace-levelGC/MS analysis or detectionby electron
capture (ECD), nitrogen-phosphorus (NPD), or other sensitivemethods. The graphbelow shows the bleed from
30m x 0.25mm, 0.25µm film columns.Compared to the other columns, including silarylene type phases, the
Rxi™-5ms column exhibits the lowest bleed.
Rxi™-5msFusedSilicaColumns
R
estek's E
x
ceptionally
I
nert (Rxi™) FusedSilicaCapillaryColumns
• Unsurpassed inertness for low level basic andacidic compounds.
• Ultra-lowbleed
• Reliableperformance, guaranteed column-to-column reproducibility
• Guaranteed toworkperfectlywith retention time-locking software.
Restek's exceptionally
inert (Rxi
™
) fused silica
capillary columns:
The processeswe use tomake
newRxi
™
columns enable us to
guarantee highly uniform
performance, column-to-column
and lot to lot, including perfect
match-upwith retention
time-locking software. It is our
promise and commitment to you
that every Rxi
™
column you
receivewill be exactly as good
as the one it replaces.
0.5ngon-columnconcentration!
7.10 7.20 7.30
GC_EV00829
GC_EV00821b
1,4-dioxane
N-nitrosodimethylamine
pyridine
Figure2
Chromatographicprofiles forwidelyused columnsproveRxi™-5mshas the lowest bleed!
GC_EV00822
Competitor columns include:
DB-5, DB-5ms, HP-5ms, ZB-5,
ZB-5ms, VF-5ms
Reference Peak
1ng tridecane
Detector: FID
330°C
350°C
Rxi™-5ms
20
17.5
15
12.5
10
7.5
5
2.5
0.0
0
2
4
6
8
10
12
14
16
18
20
22
24
pA
2,4-dinitrophenol
