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. 2004 Jan;48(1):229–235. doi: 10.1128/AAC.48.1.229-235.2004

TABLE 3.

Abrogation of antimicrobial activity caused by saltsa

Salt Minimum concn (mM)b
Molarity Ionic strengthc
LiCl 40 40
NaCl 40 40
KCl 50 50
NH4Cl 50 50
MgCl2 10 30
CaCl2 10 30
Na2SO4 20 60
K2SO4 20 60
(NH4)2SO4 20 60
MgSO4 10 40
a

The test bacterium was E. coli IFO3301; the medium was nutrient broth containing synthetic (RH)5 at 20 μg/ml (13.2 μM).

b

Salt concentration when the abrogation of antimicrobial activity was observed.

c

The sum total of the molarity (mi) of each type of ion present multiplied by the square of its charge (zi) is divided by 2 (I = 1/2 Σmi zi2, where I is ionic strength).