Page 1 of 2 CAPCELL PAK C18 MGIII Type 13.02.2014 http://hplc

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About MGIII···
The third generation of the MG series was developed to overcome the "Column-to-column variation in
retention of basic compounds under an acidic condition". We hope that the quality of MGIII will help
develop improved methods in various LC-MS applications.
Columns and
Preparative Devices
Intended to be the "standard" for LCMS
While it is based on the identical silica
used in other MG series, CAPCELL
PAK C18 MGIII possesses a weaker
hydropobicity and a stronger surface
polarity, and is suitable for a wide
variety of applications, such as analyses
of metabolites and other highly polar
compounds. Especially, its
reproducibility in retention times of
basic compounds under acidic conditions
is a preferred feature for long time-span
applications, such as clinical analyses
with LC-MS, and applications under
GLP. (MGIII's specifications include a
separation performance of amitriptyline
under an acidic condition.)
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An example of column-to-column variation
under an acidic condition is shown in Figure 1.
The compound used here was amitriptyline, a
highly basic compound used for the USP
evaluation method. The results were obtained
under an isocratic condition (0.1% formic acid /
methanol). Retention times of the three
columns (Column A, anonymous) were found
very different under the mobile phase that was
one of the most common in LC-MS. The
similar tendency was also found in many other
We carried out a comprehensive study to
understand the phenomenon of tR variation, including effects of metal impurities, reagent grade of mobile
phase solvents, and byproducts in the process of stationary phase synthesis. After eliminating one possible
cause after another, we reached a conclusion that the responsible factor was either 1) the synthetic
byproducts and the residues of impurities from reagents used for the synthetic process, or 2) isolated silanol
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groups on the stationary phase surface1.
For the former, a special method to clean and
condition columns (pre-conditioning, PC) was
invented. The PC process was intensively
studied, and one of the results was shown in
Fig.2, where the relation of the duration time of
PC and tR of amitriptyline was clearly
observed. The retention time of naphthalene, a
conventional indicator for overall retention of
C18 columns, did not change at all, while tR of
amitriptyline gradually increased with the PC
time, and reached the plateau after a certain
Solid-state 29Si-NMR, a useful tool to directly
observe different silanol groups on the surface,
did not show a significant difference between
before and after the PC process (Fig.3), which
suggested the residues of unwanted substances
were the most responsible to the tR variation of amitriptyline. Based on these results, we confidently applied
the PC process to all of the MG columns, and decided to launch the columns as "MGIII" series. The
followings are some of characteristic applications obtained with the MGIII series.
Therefore, the special PC process provided the stable retention to both of basic amitriptyline and neutral
Ref. 1) J.J.Kirkland coworkers., J.Chromatogr., 352 (1986) 275.
· Excellent reproducibility
· Comparison of column bleeding
· Separation of organic acids
· Also available worldwidely
· GLP/GMP-Supporting column
· Categorized as L1 in USP
Property values
Pore size
Surface area
Functional group
Octadecyl group
Octadecyl group
CAPCELL PAK User's Manual
Page 1 of 4
Microcolumn User's Manual
MG Series (MGIII, MGII, MG) / UG / SG / AG / CR / UHPLC columns (IF2, IF, MGIII-H)
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Technical Materials
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1.Handling the Column
2.Attaching the Column
4.Storing the Column
5.End Fittings
6.Replacement Parts and Repair Items
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CAPCELL is provided with packing material made of totally porous spherical silica coated with a
mono-layer silicone-polymer having octadecyl (C18) as well as other functional groups.
The epoch-making packing material integrates the high separation performance and pressure resistance
of silica packing material and the durability of organic polymer-based packing material.
1.Handling the Column
1. Handle the column with great care. A strong shock may cause damage.
2. Attach or detach the column when the pressure gage indicates zero.
3. The maximum column operating pressure is 100 MPa for IF2, 50 MPa for MGIII-H, 40 MPa for
IF, and 20 MPa for others.
2.Attaching the Column
1. The column joint is of the male nut type for tubing of 1/16 inch OD. Check that the tubing joints
of the system fit correctly and that the ferrule tips are deeply inserted into the joints. (See Fig. 1.)
2. Before attaching the column, replace the liquid in the system with the mobile phase to be used.
Note the replacement procedure to avoid salting out. The shipment solvent is described in the
column report enclosed with the column.
3. Attach the column according to the direction of the arrow.
3-1.Mobile Phase
1. All solvents acceptable for the conventional chemically bonded silica columns can be used.
2. The applicable pH range for capsule-type packing material depends on the bonding group. The
recommended operating pH ranges for Capcell Pak columns are listed in Table 1. The applicable
range of pH is determined by operating pH limits under which the retention and the number of
theoretical plate are maintained without decrease. It will vary depending upon the temperature and
the concentration of organic solvent. For continued high performance of the columns, ensure to
avoid using pH exceeding the recommended ones. In addition, high temperature and organic
solvent-poor condition will result in short column lifetimes when working at the extremes of pH.
Table 1 Applicable pH range for capcell pak columns
Bonding group
Applicable pH
Note: The durability of C1 and CN column are not comparable with that of C8 and Phenyl columns
because of their short function groups.
CAPCELL PAK User's Manual
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3. After full degassing, filtrate the mobile phase using a membrane filter 0.45 µm or smaller to
remove dust.
4. A 2-µm filter is used at the column inlet. To prevent foreign matter from clogging the column inlet
filter, we recommend using a line filter.
5. The mobile phase stated in the report is sealed in a new column. To change to a mobile phase
containing inorganic salt, note the replacement procedure to avoid the salting out.
6. Ion-pair reagent will slightly result in short column lifetimes
7. AQ column is applicable 100% aqueous mobile phase. However, the column lifetime will
extremely vary depending upon the HPLC conditions. It is known that acidic phosphate buffer will
provide better column lifetimes.
8. To prevent column deterioration, avoid the following:
·Frequent change of the mobile phase composition
·Rapid change in pressure of column inlet
·Continued using at pressure exceeding 15 MPa
(100 MPa for IF2, 40 MPa for IF, and 50 MPa for MGIII-H)
·High column pressure due to the use of a high-viscosity mobile phase
·Prolonged water flow
3-2.Preparing a Sample Solution
1. Dissolve the sample in a solvent of the same composition as the eluate wherever possible.
2. Using a solvent with strong dissolving power may lower the separation efficiency or cause the
sample to precipitate at the column head.
3. If there is insoluble matter remaining in the sample solution, filtrate the solution using a filter 0.45
µm or smaller.
4. The pH of the sample solution should be set in acceptable pH range for packing material.
3-3.Notes on Analysis
Columns of CAPCELL PAK series generally show similar separation profiles to those of
corresponding conventional silica-based columns, although slight selectivity difference may be
observed depending on the analyte. When optimizing the conditions for compounds already done
with conventional columns, use the same condition as a starting one.
(1)When using C18,C8,Phenyl,C1,or CN
1. Regarding the guard column: Use a column of the same packing material as the main column. If a
guard column of different packing material or the chemically bonded silica column of a different
manufacturer is used, a separation profile may not be as expected.
2. To analyze basic compounds which are protonated under neutral conditions, peak shapes became
sharper according to the buffer concentration and amount of organic solvent in mobile phase.
3. If analysis is performed with a neutral or acidic mobile phase after using a basic or strongly acidic
mobile phase, retention times and peak shapes of basic compounds may become unstable.
(2)When using NH2
1.Analysis of carbohydrate
· Set the mobile phase conditions for a mixed solution of acetonitrile and water. As the
acetonitrile concentration is higher, the carbohydrate retention is greater.
· If methanol or buffer solution is used for the eluate, peaks have a tendency to broaden.
· When you try to reproduce the same separation already done with NH2 columns of other
manufactures, raise the acetonitrile content by 5vol% from their conditions.
· Avoid using 100% water in preparing carbohydrate samples. Sample solutions of 100% water
deteriorate peak shapes by the nature of normal-phase chromatography. Prepare carbohydrate
samples in order to contain acetonitrile for more than 50%.
2.Analysis of ionic substance
· Set the mobile phase conditions with a well-defined pH value by the use of buffer.
· When optimizing pH, begin with a high pH, then lower it as needed.
Once mobile phase of low pH was used, the surface of packing material will be changed
· It may take a long time (24 hours or more) to equilibrate the column. Since the equilibrating
time depends on the flow volume and the salt concentration, allow the mobile phase to remain at
a high flow volume or the same pH and high salt concentration in urgent cases.
· Ascorbic acid may show peak tailing.
· Allantoin does not ionize in the pH range from 2 to 8. However, the use of a phosphate buffer
solution is advised.
Example of mobile phase: Acetonitrile/water = 80/20, 5 mmol/L KH2PO4, pH = 2.0 (H3PO4)
(3)When using CR
Packing material of CR is a mixture of C18 and SCX. In ion exchange mode, the following factors
will change elution behavior significantly.
· pH (pH should ideally be 2.0 or more away from pKa for full ion separation from the sample)
· Salt concentration
· Amount of organic solvent
CAPCELL PAK User's Manual
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· Salt type
4.Storing the Column
1. Seal the column with the accessory plug and store it in a cold place where there is little
temperature fluctuation.
2. Replace the column with solution of organic solvent and water having the same composition as the
mobile phase after using solvents containing strong organic acids such as TFA or basic solvents.
(Do not use 100% water.) Moreover, for storage of one week or longer,replace the column with
3. For storage within one month after using, replace the mobile phase with a solution of organic
solvent and water having the same composition as the mobile phase and then fill it with the
solvent used at the time of shipment. (Refer to the column report.)
4. Avoid using 100% water to rinse a column that is other than AQ.
5.End Fittings
1. An analytical column of up to 6-mm ID uses a filter-embedded end fitting as shown in Fig. 1. The
filter cannot be changed alone. If the filter is clogged or the column pressure is high, replace the
end fitting. See Table 3 for the replacement parts and repair items.
2. See Fig. 1 for the column connection. If the tubing is inappropriate, especially if a tube for a
different type of column is used, the length after the ferrule tip (V in Fig. 1) is often different from
the end fitting length L, and a problem may occur.
If L is greater than V, dead volume may be generated and cause peak broadening or tailing or
deterioration of separation performance.
If L is smaller than V, liquid may leak because of inadequate ferrule adhesion.
Therefore, we recommend replacing the ferrule together with the column.
*If the column is replaced frequently, the male nut may crush the ferrule and liquid may leak.
Since tightening the nut too much may cause its head to come off, replace the ferrule at an early
【Fig. 1】 Column connection
6.Replacement Parts and Repair Items
Table 3 Replacement parts and repair items
Part No.
Part Name
End fitting (4.6 mm)
2 pieces
End fitting (6 mm)
2 pieces
Ferrule (1/16)
Ferrules (1/16)10pieces
Problems in high performance liquid chromatography are attributable to various causes that cannot
all be listed up. The table below describes some comparatively common problems related to the
CAPCELL PAK User's Manual
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1. Column pressure
Blocking with foreign matter
1. Dust or insoluble matter in the
mobile phase or sample solution.
2. Dirt in the tubing.
3. Plunger seal fragment.
4. Precipitation of sample
• Sonicate the filter or replace it.
• Filtrate the mobile phase and
sample solution in advance using
a membrane filter.
• Attach a line filter.
• Clean the tubing and replace the
plunger seal.
• Prepare a sample solution with
the mobile phase.
2. Peak splitting,
tailing, and
1. Void in the column head.
2. Dead volume due to inappropriate
3. Inappropriate mobile phase
• Ion suppression method:
Inadequate suppression (Too
much sample).
• Ion-pair method: Inadequate
concentration of the ion-pair agent
(Too much sample).
4. Column deterioration.
* Not repairable in the case of
column deterioration or damage to
the packing condition.
•Reconnect the tubing.
•Review the pH, salt
concentration, sample amount,
and other conditions.
•Review the ion pair agent
concentration, pH, sample
amount, and other conditions.
•Check the column performance
using standard inspection
3. Retention time too
long or unstable.
1. Liquid leak (Indicated on the
pressure gage of the pump).
2. Inappropriate mobile phase
3. Inadequate column equilibration
• Check the pump and tubing for
any leaks.
• Secure adequate equilibration
4. Retention time too
1. Hydrolysis (deterioration) of a
bonded groups by strong acid or
2. Inappropriate mobile phase
3. Inadequate column equilibration
• Secure adequate equilibration
CAPCELL PAK is shipped after a strict performance check. However, if you should find any defect,
please contact your dealer or Shiseido for replacement.
Note that Shiseido does not warrant the product against column life or deterioration caused by the
failure to follow the above handling instructions.
Ten or more days after reception by the customer, Shiseido will assume that the product was
delivered in good condition, and will not accept a later replacement request.
2008 / 10 / 1
2nd edited 2011 / 8 / 1
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