Effect of Pretreatments on bioremoval of metals and subsequent exposure to simulated gastrointestinal conditions

Water contamination with heavy metals is increased due to environmental contaminants. Arsenic, cadmium, mercury, and lead are well-known toxic for humans. Lactobacillus acidophilus an ideal absorbent the removal of from drinking water. In this study, ability treated untreated L. ATCC 4356 remove four metals, simultaneously, multi-metallic contaminated water in 24 h was investigated. addition, stability bacteria–metal complexes evaluated simulated gastrointestinal tract conditions. According results, could 99.01% 92.35% mercury water, respectively (initial concentration 700 µg.L?1; inoculum size 2.6×1012 CFU.mL?1; pH 4; 37°C; h), whereas arsenic under same conditions, 91.28% 61.91% by heat NaOH cells, respectively. digest condition, bacteria-metal were reversible bond bacteria–Hg stronger than other complexes. The results suggest that or cells have potential adsorb