Assessment of resistance and biosorption ability of Lactobacillus paracasei to remove lead and cadmium from aqueous solution

Abstract

Since heavy metals have been regarded as ubiquitous environmental pollutants, the exploitation of bacterial biosorption has been suggested as an applicable method for being employed for heavy metal depletion. The present study aimed to characterize the function of Lactobacillus paracasei in the presence of Pb (II) and Cd (II). The simultaneous effect of pH, initial metal concentration, and inoculum size demonstrated the Pb (II) removal of 85.77% at the lowest pH, while the inoculum size was enhanced to 45 CFU/100 ml. The maximum Cd (II) removal was obtained at a high level of pH and inoculum size, while the metal concentration was reduced to 30 ppb. The addition of Cd (II) concentration in access led to the 10% drop in Cd (II) removal efficiency attributed to the metal toxicity and pH. Additionally, the slight variation in the amount of inoculum size caused the decreasing trend in the Cd (II) removal. According to the obtained results, the benefit of L. paracasei in the biosorption of heavy metals was well-recognized, which could be suggested as an alternative candidate. © 2021 Water Environment Federation • Practitioner points• Strain of Lactobacillus paracasei as potential probiotics was tested for biosorption. • A successful response surface method was proposed. • L. paracasei showed a good efficiency for the lead and cadmium biosorption.• Biosorption process was effective in removing low metal level from drinking water. • The maximum biosorption was found to be 85.77% for Pb (II) obtained from the experiment.

Heavy Metal Bioremediation Potential of Autochthonous Lactic Acid Bacteria for Use in Edible Leafy Vegetables

“…Similarly, Afraz et al reported the strain-specifc nature of LAB in biosorption of heavy metals. Tese researchers suggested that heavy metal bioremoval is a surface process due to the binding of metal cations to the anionic functional groups and depends on the capacity of the bacterial strains and metal electronegativity [44]. LAB have some polymers like peptidoglycan and lipoteichoic acid that can be responsible for the interactions between the heavy metals and the negative charge present on the surface of bacteria [15].…”