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Heavy metals are harmful to human health. Therefore, we investigated the biosorption of heavy metals by lactic acid bacteria (LAB). Of all the tested heavy metals, biosorption by LAB was highest for mercury, followed by lead, cadmium, and finally arsenic. The viability of HCT-116 cells was reduced by half in the presence of 7.5 µg/mL mercury but recovered after the addition of selected LAB strains. HCT-116 cells showed increased superoxide dismutase and catalase activities, whereas glutathione peroxidase activities decreased significantly. Addition of Lactobacillus sakei TOKAI 57m recovered all antioxidant enzyme activities. Our results suggest that this strain can be used for cellular detoxification.

Protection of human intestinal epithelial cells from oxidative stress caused by mercury using lactic acid bacteria