HBS (Ca-)

Calcium-free HBS

Make from dry ingredients:

To make mL Calcium-free HBS
start with g MgCl2
add: g KCl
add: g NaCl
add: g EGTA
add: g HEPES

Compound MW mM 1000 500 350 250 100 mL
MgCl2(6H2O) 203.3 0.493 0.1 0.05 0.035 0.025 0.01 g
KCl 74.56 2.67 0.2 0.1 0.07 0.05 0.005 g
NaCl 58.43 137.9 8 4 2.8 2 0.8 g
EGTA 380.4 0.1 0.038 0.0192 0.0134 0.0095 0.00384 g
HEPES 238.21 10 2.383 1.1915 0.858 0.596 0.238 g

raise pH to 7.3 with NaOH

1X HBS (ca-) from stock solutions

CHECK THIS

Ingredient stock M mM 0.25 0.5 1 2 L
MgCl.6H2O 1 0.49 0.0001 0.0002 0.0005 0.0010 mL
KCl 1 2.67 0.0007 0.0013 0.0027 0.0053 mL
NaCl 5 137.90 0.0069 0.0138 0.0276 0.0552 mL
HEPES 1 10 0. 025 0. 050 0. 100 0. 200 mL

pH 7.3 with NaOH

filter sterilize