Biosorption of Cadmium by Non-Toxic Extracellular Polymeric Substances (EPS) Synthesized by Bacteria from Marine Intertidal Biofilms

Cadmium is a major heavy metal found in polluted aquatic environments, mainly derived from industrial production processes. We evaluated the biosorption of solubilized Cd using the extracellular polymeric substances (EPS) produced by sp. MC3B-22 and sp. MC3B-10 (Microbactan); these bacteria were ori...

Full description

Saved in:
Bibliographic Details
Published in:International journal of environmental research and public health 2018-02, Vol.15 (2), p.314
Main Authors: Camacho-Chab, Juan Carlos, Castañeda-Chávez, María Del Refugio, Chan-Bacab, Manuel Jesús, Aguila-Ramírez, Ruth Noemí, Galaviz-Villa, Itzel, Bartolo-Pérez, Pascual, Lango-Reynoso, Fabiola, Tabasco-Novelo, Carolina, Gaylarde, Christine, Ortega-Morales, Benjamín Otto
Format: Article
Language:English
Subjects:
Adsorption
Alcohol
Aquatic environment
Bacillus
Bacteria
Biofilms
Bioremediation
Biosorption
Cadmium
Carbohydrates
Deoxyribonucleic acid
DNA
Functional groups
Heavy metals
Industrial production
Metals
Microorganisms
Neural networks
Phenols
Photoelectron spectroscopy
Proteins
Sorption
Spectrometry
X ray photoelectron spectroscopy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Cadmium is a major heavy metal found in polluted aquatic environments, mainly derived from industrial production processes. We evaluated the biosorption of solubilized Cd using the extracellular polymeric substances (EPS) produced by sp. MC3B-22 and sp. MC3B-10 (Microbactan); these bacteria were originally isolated from intertidal biofilms off the coast of Campeche, Mexico. EPS were incubated with different concentrations of cadmium in ultrapure water. Residual Cd concentrations were determined by Inductive Coupled Plasma-Optic Emission Spectrometry and the maximum sorption capacity (Qmax) was calculated according to the Langmuir model. EPS were characterized by X-ray photoelectron spectroscopy (XPS) before and after sorption. The Qmax of Cd was 97 mg g for Microbactan and 141 mg g for MC3B-22 EPS, these adsorption levels being significantly higher than previously reported for other microbial EPS. In addition, XPS analysis revealed changes in structure of EPS after biosorption and showed that amino functional groups contributed to the binding of Cd , unlike other studies that show the carbohydrate fraction is responsible for this activity. This work expands the current view of bacterial species capable of synthesizing EPS with biosorbent potential for cadmium and provides evidence that different chemical moieties, other than carbohydrates, participate in this process.
ISSN:1660-4601
1661-7827
1660-4601
DOI:10.3390/ijerph15020314