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Bioprocess Biosyst Eng ; 43(11): 1951-1960, 2020 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-32500436

RESUMEN

In this study, the roles of extracellular polymeric substances (EPSs) excreted by Pandoraea sp. XY-2 in the removal of tetracycline (TC) were investigated. In the early stage, TC in the solution was mainly removed by the adsorption of EPSs, which accounted for 20% of TC. Thereafter, large amount of TC was transported into the intracellular and biodegraded. EPSs was extracted and the contents of polyprotein and polysaccharides reached their maximum values (30.84 mg/g and 11.15 mg/g) in the first four days. Fourier transform infrared spectroscopy analysis revealed that hydroxyl, methylidyne, methylene and amide I groups in EPSs participated in the adsorption of TC. Furthermore, three-dimensional excitation-emission matrix fluorescence spectroscopy analysis revealed that TC caused the quenching of EPSs fluorescent groups. The quenching mechanism was attributed to static quenching and protein-like substances in EPSs from Pandoraea sp. XY-2 dominated the TC adsorption process. Bioinformatic analysis of Pandoraea sp. XY-2 genome identified multiple genes involved in exopolysaccharide synthesis and EPSs formation. The insights gained in this study might provide a better understanding about the adsorption process of EPSs in tetracycline-contaminated environment.


Asunto(s)
Burkholderiaceae/metabolismo , Matriz Extracelular de Sustancias Poliméricas/química , Polímeros/química , Poliproteínas/química , Polisacáridos/química , Espectrometría de Fluorescencia/métodos , Tetraciclina/química , Tetraciclina/aislamiento & purificación , Contaminantes Químicos del Agua/aislamiento & purificación , Adsorción , Antibacterianos/química , Biotecnología/métodos , Metano/análogos & derivados , Aguas del Alcantarillado/química , Espectroscopía Infrarroja por Transformada de Fourier , Factores de Tiempo , Contaminantes Químicos del Agua/química , Purificación del Agua
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