Marc’s modified Ringer’s (MMR) (1X)
0.1 M NaCl
2 mM KCl
1 mM MgSO4
2 mM CaCl2
5 mM HEPES (pH 7.8)
0.1 mM EDTA
Sterilize by autoclaving, and store at room temperature.
Common alternative formulations of MMR omit EDTA and are adjusted to pH 7.4.
0.1 M NaCl
2 mM KCl
1 mM MgSO4
2 mM CaCl2
5 mM HEPES (pH 7.8)
0.1 mM EDTA
Sterilize by autoclaving, and store at room temperature.
Common alternative formulations of MMR omit EDTA and are adjusted to pH 7.4.