GE PD MiniTrap G-25 Installation and operation manual

PD MiniTrap G-25
Product Booklet
Code: 28922529
PD MiniTrap G-25 contains
• 50 prepacked disposable PD MiniTrap™ columns containing
2.1 mL of Sephadex™ G-25 resin
• 4 adapters
• Instructions for use
Purpose
PD MiniTrap G-25 columns are prepacked and designed for
rapid, convenient sample clean-up of proteins and other large
biomolecules (>5000 Mr).
PD MiniTrap G-25 columns can be used in a wide range of
applications such as desalting, buffer exchange and removal of
low-molecular weight compounds

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Table of contents
1. Principle 2
2. Advice on handling 4
3. Safety precautions 6
4. Column assembly 6
5. Gravity protocol 7
6. Spin protocol 8
7. Recovery and desalting capacity 9
8. Column characteristics 10
9. Ordering information 11
1 Principle
PD MiniTrap G-25 columns contain Sephadex G-25 resin, which
allows rapid group separation of high molecular weight substances
from low molecular weight substances.
PD MiniTrap G-25 columns are used for desalting, buffer exchange
and sample clean up. Small molecules like salt, free labels and other
impurities are efficiently separated from the high molecular weight
substances of interest.
The chromatography technique is gel filtration and molecules are
separated on the basis of differences in size

3
• Molecules larger than the largest pores in the Sephadex matrix are
excluded from the matrix and are eluted first, in or just after the
void volume. The void volume is the column volume outside the
Sephadex matrix.
• Molecules smaller than the largest pores in the Sephadex matrix
will penetrate the pores to varying extent. They have a larger
accessible column volume than the large molecules and therefore
they elute after the large molecules just before one total column
volume of buffer has passed through the column.
Group separation can be made using two different protocols, gravity
protocol and spin protocol.
GE provides an assortment of sample clean-up products. The
different formats available are summarized in Table 1.
Table 1. Product overview
Clean Up
product
Exclusion
limit, Mr
Bed
volume
Sample volume
gravity protocol1
Sample colume
spin protocol1
PD SpinTrap™
G-25
5000 0.5 mL - 100 to 180 µL
PD MultiTrap™
G-25
5000 0.5 mL - 70 to 130 µL
PD MiniTrap™
G-25
5000 2.1 mL 0.1 to 0.5 mL 0.2 to 0.5 mL
PD MidiTRap™
G-25
5000 3.5 mL 0.5 to 1.0 mL 0.75 to 1.0 mL
PD-10 Desalting
Columns
5000 8.3 mL 1.0 to 2.5 mL 1.75 to 2.5 mL
PD MiniTrap
G-10
700 2.1 mL 0.1 to 0.3 mL -
PD MidiTrap
G-10
700 5.3 mL 0.4 to 1.0 mL -
1Recommended sample volumes.

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2. Advice on handling
Protocol selection
The separation can be made using two different protocols, gravity
protocol or spin protocol, see Table 2 for protocol overview.
Gravity protocol
The liquid passes through the column by gravity force.
• There is a slightly higher recovery and desalting capacity using
gravity protocol compared to when using the spin protocol.
• The applied sample is diluted.
Spin protocol
Additional gravity force is added by spinning the column in a
centrifuge for some protocol steps
• There is no dilution of the sample.
Table 2. Protocol overview
Protocol Sample
volume
Elution buffer Dilution factor Desalting
capacity
Gravity 0.1—0.5 mL 1.0 mL 2 times1›98%
Spin 0.2—0.5 mL None None ›90%
1Two times dilution valid if 0.5 mL sample volume is used.
Recovery
The recovery of applied amount sample is dependent on type
of protein or other biomolecule. Typically the recovery is in the
range 70—90%. An increase in sample concentration can improve
recovery.

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Equilibration
• It is critical to equilibrate the column since UV absorbing stabilizers
are used in column packing.
• Equilibration is most conveniently made by gravity also when using
the spin protocol.
Sample Application
• The MiniTrap column is intended for sample volumes up to 0.5 mL.
• For sample volumes less than 0.5 mL, allow the sample to enter
the packed bed completely and then add equilibration buffer
(stacker volume) so that the total volume of sample and buffer
added equals 0.5 mL.
• Allow the sample to enter the packed bed completely before any
addition of buffer for elution.
Elution
• For higher recoveries, use stacker volumes (spin protocol).
Centrifugation
• For better result if using a fixed angle rotor centrifuge: Put the
columns in same direction in all centrifugation steps (spin protocol).

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3 Safety precautions
Always use normal personal protection devices like gloves and safety
glasses when handling PD MiniTrap G-25 columns.
WARNING: The column storage solution, 0.15%
Kathon™ CG/ICP biocide, is potentially allergenic.
Use gloves when discarding the storage solution.
4 Column assembly
For use in the spin protocol the PD MiniTrap G-25 column should be
assembled with adapter and collection tube as shown in Fig 1.
Note: This column assembly may also be used for convenient
handling of columns when using the gravity protocol.
Fig 1. Assembly of column, adapter and collection tube.

77
5 Gravity protocol
1 PD MiniTrap G-25 preparation
• Remove the top cap and pour off the column storage
solution.
• Remove the bottom cap.
2 Column equilibration
• Fill up the column with equilibration buffer and allow the
equilibration buffer to enter the packed bed completely.
• Repeat twice.
• Discard the flow-through.
Note: About 8 mL equilibration buffer should be used in
total for all three steps.
3 Sample application
• Add maximum 0.5 mL of sample to the column.
• For sample volumes less than 0.5 mL, add equilibration
buffer to adjust the volume up to 0.5 mL after the sample
has entered the packed bed completely.
• Let the sample or equilibration buffer enter the packed bed
completely.
• Discard the flow-through.
4 Elution
• Place a test tube for sample collection under the column.
• Elute with 1.0 mL buffer and collect the eluate. A typical
elution profile is shown in Fig 2

8
6 Spin protocol
1 PD MiniTrap G-25 preparation
• Remove the top cap and pour off the column storage
solution.
• Remove the top filter using forceps.
• Remove the bottom cap.
• Put the PD MiniTrap G-25 into a 15 mL collection tube
by using the column adapter, see Fig 1
2 Column equilibration
• Fill up the column with equilibration buffer and al-
low the equilibration buffer to enter the packed bed
completely.
• Repeat once.
• Discard the flow-through.
• Fill up the column a third time with equilibration buffer
and spin down at 1000 × gfor 2 minutes.
• Discard the flow-through.
Note: About 8 mL equilibration buffer should be used in
total for all three steps.
3 Sample application
• Add sample (0.2—0.5 mL) slowly in the middle of the
packed bed.
4 Elution
• Place the PD MiniTrap G-25 into a new 15 mL
collection tube.
• Elute by centrifugation 1000 × gfor 2 minutes.
• Collect the eluate.

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7 Recovery and desalting capacity
The following experiment is included as an example of a desalting
experiment using the gravity protocol. A PD MiniTrap G-25 column
was equilibrated with MilliQ™ water. 500 µL of bovine serum albumin
1000 µg/mL) in 1M NaCl was applied onto the column. The protein
recovery was 95% and the desalting capacity was above 99%, see
Fig 2."
Fig 2. Removal of NaCl from albumin solution with PD MiniTrap G-25.
The albumin is eluted in volume fractions between 0.5 to 1.5 mL
(indicated by arrows).
0
200
400
600
800
1000
0
Elution volume (mL)
Concentration
Protein conc.
(µg/mL)
NaCl
in eluate
(mM)
1.0 3.02.0 4.0

8 Column characteristics
Matrix Sephadex G-25 resin
Particle size range 85 to 260 µm
Packed bed dimensions 0.97 × 2.8 cm (2.1 mL)
Maximum sample volume 0.5 mL
Volume of eluted sample gravity 1.0 mL
Volume of eluted sample spin 0.5 mL
Desalting Capacity >90%
Exclusion limit Mr5000
Chemical stability All commonly used buffers
Working pH range 2—13
Storage temperature +4 to - 30°C
Storage solution 0.15% Kathon CG/ICP biocide
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9 Ordering information
Product Pack size Code No.
PD MiniTrap™ G-25 50 28-9180-07
Related products Pack size Code No.
PD-10 Desalting
Columns
30 17-0851-01
PD SpinTrap G-25 50 28-9180-04
PD MultiTrap G-25 4 × 96-well filter plates 28-9180-06
PD MidiTrap G-25 50 28-9180-08
PD MiniTrap G-10 50 28-9180-10
PD MidiTrap G-10 50 28-9180-11
MiniSpin Adapter 10 28-9232-43
HiTrap™ Desalting 5 × 5 mL 17-1408-01
HiTrap Desalting1100 × 5 mL 11-0003-29
HiPrep™ 26/10 Desalting 1 × 53 mL 17-5087-01
HiPrep 26/10 Desalting 4 × 53 mL 17-5087-02
1Pack size available by special order
11

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28922529 AC 09/2016
www.gelifesciences.com/trap
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751 84 Uppsala
Sweden
GE monogram, SpinTrap, MultiTrap,
MiniTrap, MidiTrap, HiTrap, HiPrep,
and Sephadex are trademarks of GE
Healthcare companies.
Kathon is a trademark of Dow Chemical
Co., MilliQ is a trademark of Merck
KGaA.
All third party trademarks are the
property of their respective owners.
© 2007—2016 General Electric
Company – All rights reserved.
First published Sep. 2007
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