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Chapter 2 Dispensing to SpectroCHIP Arrays
39
USG-CUS-059 Rev05
MassARRAY® Nanodispenser RS1000 v2.1 User Guide
For Research Use Only. Not for use in diagnostic procedures.
2.6 Microtiter plate checks
Checking the resin and
liquid levels
A layer of Clean Resin (yellow or brownish-yellow color) underlies a liquid analyte layer in
a microtiter plate well. The levels of the resin and liquid must be checked to ensure they
are adequate for nanodispensing. This section uses a 384-well plate as an example, but
the process is the same for a 96-well plate. (See
for a 96-well example.)
In a 384-well microtiter plate, the resin level should come up no higher than 4.5-5.0 mm
from the bottom of the wells
. In each well, the liquid (analyte) above the
resin should be at least 2.5 mm higher than the top of the resin layer.
To adjust the resin or analyte level:
CAUTION
!
Use a new pipette tip for each well to avoid cross-contamination of samples.
1.
If a well has too much resin:
a. Pipette some out until the distance to the top of the resin layer (from the bottom
of the well) is no higher than the maximum value (see
. Pipette
carefully, removing only what is necessary.
b. Centrifuge the microtiter plate for 3 minutes at 1600 x g.
2.
If the liquid level (analyte) in the wells is less than 2.5 mm above the resin
:
a. Bring up the liquid level by adding HPLC-grade water with a pipette.
b. Check to make sure that the liquid level is uniform across all wells.
NOTE
NOTE
There is a maximum allowable level of resin in the wells, but there is no minimum. If a well has a
lower resin than others, the liquid level above the resin may come up to a lower point. (See the
following example.)
Figure 2.27 Checking the Resin Level in the Microtiter Plate Wells
Resin
Cross-section of
a microtiter plate
4.5-5.0 mm maximum (6 mg resin plate)
Analyte
The top of the liquid level (analyte) must be at
least 2.5 mm higher than the top of the resin layer