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Chemosphere

Title:		"Degradation of the mixture of ethyl formate, propionic aldehyde, and acetone by Aeromonas salmonicida: A novel microorganism screened from biomass generated in the citric acid fermentation industry"
Author(s):		Yao X; Wang K; Zhang S; Liang S; Li K; Wang C; Zhang T; Li H; Wang J; Dong L; Yao Z;
Address:		"Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing, 100048, China. Electronic address: yaoxiaolong@btbu.edu.cn. Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing, 100048, China. Beijing Engineering and Technology Research Center of Food Additives (Beijing Technology and Business University), Beijing, China. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China. School of Energy Science and Engineering, Central South University, Changsha, 410083, China. Fufeng Group, Linyi, 276600, China. Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing, 100048, China. Electronic address: yaozhl@th.btbu.edu.cn"
Journal Title:		Chemosphere
Year:		2020
Volume:		20200609
Issue:
Page Number:		127320 -
DOI:		10.1016/j.chemosphere.2020.127320
ISSN/ISBN:		1879-1298 (Electronic) 0045-6535 (Linking)
Abstract:		"Microorganisms play important roles in the degradation of volatile organic compounds. Aeromonas salmonicida strain (AEP-3) generated from biomass in the citric acid fermentation industry was screened and subjected to denaturing gradient gel electrophoresis (DGGE) fingerprinting and 16S rDNA gene sequencing. The growth conditions of AEP-3 in Luria-Bertani broth were optimized at 25 degrees C and approximately pH 7. AEP-3 was used to degrade ethyl formate, propionic aldehyde, or acetone alone and their mixture. The concentrations of ethyl formate, propionic aldehyde, and acetone were below 7500, 600, and 800 mg L(-1), respectively, and their maximum degradation efficiencies were 100%, 92.41%, and 34.75%. AEP-3 first degraded acetone and propionic aldehyde in the mixture, followed by ethyl formate. The degradation pathways of these organic compounds in the mixture and their substrate interactions during degradation were explored. Propionic aldehyde was first converted into propionic acid in the metabolic process and was involved in the subsequent carboxylic acid cycle. By contrast, ethyl formate was first hydrolyzed into formic acid and ethanol. Then, formic acid participated in the cyclic metabolism of carboxylic acid, whereas, ethanol was hydrolyzed into acetaldehyde and acetic acid through alcohol and aldehyde dehydrogenase. Additionally, acetone directly interacted with nitrate in the medium under the action of hydrogen ions and produced carbon dioxide, water, and nitrogen. Overall, this study provides a new degrading bacterium biodegradability toward the exhaust gas of citric acid fermentation"
Keywords:		"Acetaldehyde Acetic Acid/metabolism Acetone/*metabolism Aeromonas salmonicida/*metabolism Biodegradation, Environmental Biomass Citric Acid/metabolism Ethanol/metabolism Fermentation Formates Formic Acid Esters/*metabolism Propionates/metabolism Acetone A;"
Notes:		"MedlineYao, Xiaolong Wang, Ke Zhang, Shanshan Liang, Shan Li, Ke Wang, Chun Zhang, Tingting Li, Hailong Wang, Juncheng Dong, Liming Yao, Zhiliang eng England 2020/06/20 Chemosphere. 2020 Nov; 258:127320. doi: 10.1016/j.chemosphere.2020.127320. Epub 2020 Jun 9"