Zinc Uptake by Lactic Acid Bacteria

Table 1

Minimum inhibitory concentration (MIC) of zinc salts and cell bound zinc concentration in Lactobacillus and Bifidobacterium strains.

Strain	MIC* (mmol L^−1)	Cell-bound Zn^† (μmol g^−1)
Lactobacillus acidophilus ATCC 4356	15	107
Lactobacillus acidophilus DSMZ 20552	>100	11^d
Lactobacillus acidophilus WC 0202	>100	63^a
Lactobacillus acidophilus WC 0203	15	135
Lactobacillus brevis ATCC 4006	>100	86
Lactobacillus buchneri WC 0204	50	50^b
Lactobacillus casei WC 0205	15	29^c
Lactobacillus gasseri WC 0213	>100	21^c,d
Lactobacillus parabuchneri WC 0283	100	18
Lactobacillus plantarum WC 0214	>100	50^b
Lactobacillus reuteri WC 0215	>100	61^a,b
Bifidobacterium breve WC 0421	15	32^a
Bifidobacterium breve WC 0480	100	15^b
Bifidobacterium breve WC 0481	50	17^b
Bifidobacterium infantis WC 0460	15	32^a
Bifidobacterium pseudocatenulatum WC 0455	15	31^a

∗MIC was determined in MRS agar plates containing ZnCl₂ or ZnSO₄. Difference between ZnCl₂ and ZnSO₄ was not significant (P > 0.05).
^†Zinc uptake was determined in MRS supplemented with 10 mmol L⁻¹ ZnSO₄. Values are means from three separate experiments, standard deviation was less than 5  μmol g⁻¹. Within a microbial genus, means sharing a common superscript do not differ (P > 0.05).