Production and functionality of exopolysaccharides in bacteria exposed to a toxic metal environment

Ecotoxicology and Environmental Safety

Thangavel Mathimani¹  Jayaraman Uthaya Chandirika²  Gurusamy Annadurai³  Huaqun Yin⁴  Rajendran Rajaram⁵  Krishnamurthy Mathivanan⁶ 

[1] Corresponding authors.;Environmental Nanotechnology Division, Sri Paramakalyani Centre of Excellence in Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi, Tamil Nadu 627 412, India;Department of Energy and Environment, National Institute of Technology, Tiruchirappalli, Tamil Nadu 620015, India;Department of Marine Science, Bharathidasan University, Tiruchirappalli, Tamil Nadu 620 024, India;Environmental Nanotechnology Division, Sri Paramakalyani Centre of Excellence in Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi, Tamil Nadu 627 412, India;School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;

关键词: Bacteria;    Exopolysaccharides;    Compositional analysis;    Surface morphology;    Functional groups;    Metal adsorption;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this study, the production and compositional analysis of exopolysaccharides produced by Bacillus cereus KMS3-1 grown in metal amended conditions were investigated. In addition, the metal adsorption efficacy of exopolysaccharides (EPS) produced by KMS3-1 strain was evaluated in a batch mode. Increased production of exopolysaccharides by KMS3-1 strain was observed while growing under metal amended conditions (100 mg/L) and also, the yield was in the order of Pb(II)>Cu(II)>Cd(II)>Control. Characterization of EPS using FT-IR, XRD, and SEM analysis revealed that the EPS can interact with metal ions through their functional groups (O‒H, CH, C˭O, C‒O, and C‒C˭O) and assist the detoxification process. Further, equilibrium results were fitted with the Langmuir model and notably, the maximum adsorption capacity (Qmax) of EPS for Cd(II), Cu(II), and Pb(II) found to be 54.05, 71.42, and 78.74 mg/g, respectively. To the best of our knowledge, EPS demonstrating proficient metal adsorption was substantiated by XRD analysis in this study. Owing to good adsorbing nature, the exopolysaccharides could be used as chelating substances for wastewater treatment.

【 授权许可】

Unknown