Composition of Additional Buffers and Solutions
1M HEPES (pH 7.5)
• 23.83g HEPES
• Water to 100ml
Adjust to pH 7.5 with potassium hydroxide (KOH). Store
at 4°C.
5X MOPS buffer
• 0.2M MOPS (pH 7.0)
• 0.05 sodium acetate
• 0.005M EDTA (pH8.0)
For 2 liters of buffer, add 83.72g of MOPS (free acid) and
8.23g of sodium acetate to 1.6 liters of DEPC-treated water
and stir until completely dissolved. Add 20ml of
DEPC-treated 0.5M EDTA, and adjust the pH to 7.0 with
10N NaOH. Bring the final volume to 2 liters with
DEPC-treated water. Filter sterilize and dispense into
aliquots.
phosphate-buffered saline (PBS)
• 8g NaCl, 0.2g KCl
• 1.44g Na2HPO4
• 0.24g KH2PO4
Dissolve salts in 800ml of distilled water. Adjust to pH 7.4
with HCl. Add water to 1 liter. Dispense into aliquots.
Sterilize by autoclaving.
Protocols & Applications Guide
www.promega.com
rev. 12/12
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PROTOCOLS & APPLICATIONS GUIDE
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