
Preparing Samples
Voyager
™
Biospectrometry
™
Workstation User’s Guide 3-25
3
Procedure
To clean samples with ZipTips:
1. Wash a C
18
ZipTip in the following order with:
• 10 µl of ACN
• 10 µl of 50:50 ACN:0.1%TFA
• 10 µl of 0.1% TFA
• Repeat wash of 10 µl of 0.1% TFA
To wash, draw a few microliters of a wash solution up into
the ZipTip and expel to waste.
2. Draw a few microliters of the sample up and down in the
ZipTip several times.
3. Discard the liquid. The sample is bound to the C
18
surface
in the ZipTip.
4. Wash the ZipTip again with 10 µl of 0.1% TFA by drawing
up into the ZipTip and expel to waste.
5. Repeat step 4 two times.
6. Elute the sample with 2 to 3 µl of organic solvent or matrix
containing approximately 50 percent ACN by drawing
solvent or matrix/solvent up and down in the ZipTip
several times.
NOTE: A 50 percent organic concentration should give
50 to 70 percent sample recovery. You can vary the
organic concentration to optimize recovery.
7. Elute samples directly on the plate as described in
Section 3.2.2, Loading Samples
(Dried Droplet Application), or into a microcentrifuge tube
for storage.
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