Probiotic Lactobacillus sp. with bioremediation potential of toxic heavy metals

Abstract

Pollution of the environment and food with toxic heavy metals is being intensified in Bangladesh with industrial development. Consumption of foods and water contaminated with heavy metals imposes threat to human health. Aiming to find a solution to this problem, the present study focuses on probiotic Lactobacillus spp. with potential to remove heavy metals from environment as well as human body. A total of three Lactobacillus spp were isolated from curd samples and were identified based on their morphological and biochemical properties. These isolates were tolerant to low pH and bile salt which aids in their application in human gut. All isolates could tolerate 600 ppm chromium, 400 ppm lead, 400 ppm copper and 400 ppm zinc. The heavy metal tolerant Lactobacillus spp were also multi drug resistant and showed 100% resistance to Azithromycin, Cloxacillin, Gentamicin, Vancomycin, Streptomycin, Nalidixic acid, Trimethoprim-Sulfamethoxazole and Penicillin, while 100% sensitivity was observed to Imipenem.
 Bangladesh J Microbiol, Volume 34 Number 1 June 2017, pp 43-46

Impact of simulated microgravity on bioremoval of heavy-metals by Lactobacillus acidophilus ATCC 4356 from water

“…Environmental pollution entering the body through water, air, and food, has devastating effects on human health ( Abdel-Megeed, 2021 ; Breton et al., 2013 ). Heavy metals such as arsenic, cadmium, lead, and mercury are some of these pollutants, and elimination of them from the body is on the research agenda ( Ahmed et al., 2017 ; Feng et al., 2022 ). Several studies have proven that probiotic bacteria have the ability to absorb heavy metals and remove pollution caused by them ( Massoud and Zoghi, 2022 ; Mirmahdi et al., 2022 ).…”

Lead biosorption efficiency of Levilactobacillus brevis MZ384011 and Levilactobacillus brevis MW362779: A response surface based approach

“…Presumptive metals removing LAB are expected to survive in Pb contaminated environment. Previously, the Pb removing strains were isolated by different researchers on the basis of their survival in the presence of 100–2000 ppm of Pb ( Bhakta et al, 2012 , Oves et al, 2013 , Li et al, 2017 , Yi et al, 2017 , Ahmed et al, 2018 , Pakdel et al, 2019 ). In the current study, initial selection of LAB was performed on the basis of their survival in the presence of 50–1000 ppm Pb.…”

“…Probiotics are living microbes which when administrated in sufficient concentration, have a significant positive impact on the health of hosts ( FAO/WHO, 2001 ). Heavy metal biosorption by lactic acid bacteria (LAB) based probiotics, including , Lactobacillus rhamnosus, L. casei , L. fermentum, L. plantarum, L. acidophilus and L. bulgaricus has been reported ( Sedighi et al, 2012 , Yin et al, 2016 , Ahmed et al, 2018 , Ameen et al, 2020 , Kermanshahi et al, 2020 ). Microbial surfaces have physicochemical interactions with heavy metals that enhance bioaccumulation process by forming complexes, ion exchange, chelation, microprecipitation and adsorption ( Monachese et al, 2012 , Mrvčić et al, 2012 , Zoghi et al, 2014 ).…”

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

“…Heavy metals as one of the main environmental challenges have received much more attention over the decades because of their long-term persistence and toxicity in the low concentration, bioaccumulation potential, and neurotoxic and carcinogenic effects (Rahman et al, 2019;Riskuwa-Shehu et al, 2019). The release of heavy metals into the environment can threaten human survival and the life span of animals through the transfer of these contaminants into the food chain as a result of heavy metal solubility in water (Ahmed et al, 2018;Baltas et al, 2020). Many works of literature have highlighted the critical potential risk of heavy metals influenced the entire eco-environment via fossil fuel combustion, mining residues, electroplating, fertilizers, and pesticides (Chu & Phang, 2019;Xu et al, 2020;Yan et al, 2020).…”