Hoefer PR648 - Manual (Page 7)

Applying your samples
1
Turn on the vacuum pump and adjust the pump or
bleed valve until the vacuum is 13 –25 cm Hg.
2
Turn off the vacuum.
3
Carefully load a sample, at least 50 µl in volume, into
each well. (A 50 µl size is necessary to distribute the
sample evenly over the slot.) To prevent bubbles from
forming, pipet each sample against the bottom side-wall
of the well. This is especially important it your sample
contains proteins or detergents. If bubbles should form,
flush them out with the pipetter tip.
4
Turn on the vacuum and set it at 13 –25 cm Hg.
When all of the sample liquid has been pulled through
the membrane, add 1 ml of buffer to each slot,
pipetting against the bottom-side wall. Adjust vacuum
to 38–50 cm Hg. After all of the buffer is pulled
through, repeat twice more for a total of three rinses.
Removing your blot
1
With the vacuum still on, remove the screws and
carefully lift off the top block.
2
Using forceps, lift the membrane off and place it on
clean, dry filter paper. Turn off the vacuum.
3
Process the membrane according to your protocol.
4
If you plan to scan the blot itself with a densitometer,
dry the membrane flat by placing it on the smooth
side of a porous polyethulene sheet. Dry it for several
minutes in a vacuum gel dryer without heat.
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p5
Note: Do not use samples
containing organic solvents.