ver.210922E
SHOWA DENKO K.K. (https://www.shodex.com/)
2
4.
Usable Conditions
Usable solvents are listed below.
Chloroform, Tetrahydrofran (THF), Toluene, Dichloroethane, Ethylacetate, N,N-Dimethylformamide (DMF) and
Acetone
Attention!
· Use the column within above stated flow rate, pressure, and temperature ranges. Using
the column outside the given range may damage the column and lower its performance.
·
Column pressure is influenced by the eluent composition, flow rate, and column
temperature. When changing the eluent compositions, adjust the flow rate and column
temperature so that the column pressure remains below the usable maximum pressure.
· Shear degradation is more likely to occur in larger molecular weight compounds. When
shear degradation occurs, the measured molecular weight may be lower than the actual
value or it may influences the repeatability of the analysis. If shear degradation is
suspected, use a lower flow rate.
5. Eluent Preparation
(1) Degas the eluent fully to prevent the formation of air bubbles.
(2) Presence of small debris or insoluble substances may result in deterioration of the column and/or they appear
as noise on the chromatograms. Filter the eluent with a 0.45-
μ
m disposable filter to prevent the problems.
Attention!
· Use HPLC grade organic solvent whenever possible. Solvents left in an opened bottle for
a long time should not be used. The content may have been changed, absorbed moisture,
or has been contaminated.
· Always use freshly prepared solvents. Solvents stored for a long time may have changed
their compositions and may influence elution patterns and/or damage the column.
Note
· Use of on-line degasser is recommended.
6. Sample Preparation
(1) If possible, use the eluent for analysis to dissolve or dilute samples. If this is difficult, use a solvent which
has a composition that is as close as possible to the eluent's composition, but which fully dissolves or dilutes
the sample.
(2) Filter the sample solution using disposable 0.45-
μ
m filter to prevent the column from clogging or deteriorating.
(3) Recommended injection volume is 500 - 2,000
μ
L per column.
(4) Viscosity of high molecular weight compound is largely influenced by its molecular weight and concentration.
Samples with high viscosity cause peak broadening and elution delay, and this makes it difficult to obtain
their accurate molecular weight distributions. In general, the larger the molecular weight of the compound,
the higher its viscosity becomes. To suppress the influence from high viscosity, it is recommended to lower
the sample concentration. Please use the below table as a reference when preparing samples for molecular
weight distribution analyses.
Molecular Weight Range
Optimal Concentration (w/v)
≤
5,000
≤
1.0 %
5,000 - 25,000
≤
0.5 %
(5) When sample contains water, methanol, or hexane, remove them prior to the injection.
Note
· Use of guard column is recommended to protect the analytical column.
Product Name
Flow Rate (mL/min)
Maximum Pressure
(MPa)
(Per Column)
Temperature
Range (°C)
Recommended Maximum
GPC FP-2002
5 - 10
20
5
20 - 60
GPC FP-G 8B
- -
-
