Comparative Study of Roxarsone Reduction by Shewanella oneidensis MR-1 and Cellulomonas sp. Strain Cellu-2a

Applied Sciences

Anamika Khanal¹  Ji-Hoon Lee¹  Cuong Tu Ho²  Hor-Gil Hur³ 

[1] Department of Bioenvironmental Chemistry, Jeonbuk National University, Jeonju 54896, Korea;Institute of Environmental Technology, Vietnam Academy of Science and Technology, Hanoi 10072, Vietnam;School of Environmental and Earth Science, Gwangju Institute of Science and Technology, Gwangju 61005, Korea;

关键词: fermentative reduction;    indirect reduction;    organoarsenic compound;    bacterial degradation;   

DOI  :  10.3390/app12041839

来源: DOAJ

【 摘 要 】

Roxarsone, an organoarsenic compound, has been used extensively as an additive in poultry feed to promote animal growth. Although roxarsone is moderately toxic, it can be converted into more toxic compounds upon exposure to the environment, resulting in human health risks. This article reports on a comparative study of roxarsone reduction by fermentative, anaerobic Cellulomonas sp. Cellu-2a and a widely distributed metal-reducing bacterium, Shewanella oneidensis MR-1. The strain Cellu-2a showed a faster roxarsone reduction capability by fermentative growth than by MR-1 in anaerobic respiration. With an environmentally relevant mineral, hydrous ferric oxide (HFO) included in the incubations, there was a rather rapid abiotic (indirect, heterogeneous) reduction of roxarsone by the solid phase Fe(II) in HFO generated by reduction of Fe(III) of HFO by MR-1, while still direct reduction was major reaction by Cellu-2a even with HFO. This study provides evidence of direct and/or indirect bacterial reduction of roxarsone in fermentative conditions as well as in anaerobic respiration conditions, at exposure to the environment, which would assist understanding of environmental behaviors of roxarsone in biological settings with HFO, a naturally occurring ubiquitous mineral class.

【 授权许可】

Unknown