Bio-Rad Model 785 Vacuum Blotter User Manual
Page 19

Chart 3: Gel Concentration Effect On Transferring Efficiency
Vacuum Pressure - 5 inches Hg; Time of Transfer - 90 minutes; Gel percentage – varied.
7.2 Required Solutions and Equipment
The check list below consists of stock solutions and equipment that are necessary for
the vacuum transfer process.
A. Stock Solutions:
To Make 1,000 ml Solution
1. 20x SSC
175.3 g of NaCl + 88.2 g of sodium citrate in 800 ml
of double distilled water. Adjust to pH 7.0 with a few
drops of concentrated HCl. Adjust to 1,000 ml.
2. 5 M NaCl
292.2 g of NaCl in 800 ml of double distilled water.
Adjust to 1,000 ml.
3. 5 N NaOH
200 g NaOH pellets in 800 ml of double distilled
water. Adjust to 1,000 ml. Caution: Highly
exothermic reaction.
4. HCl
Purchase concentrated liquid stock.
100
80
60
40
20
0
0.8
kb
4.1
kb
15
kb
23
kb
F
ragment Size
0.7% G
el
1.0% G
el
1.5% G
el
%
o
f
T
ra
n
sf
e
r
15
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