Biodegradation and decolourization of methyl red by <i>Aspergillus versicolor</i> LH1

Hu, Cui Ying; Cheng, Hong Ying; Yao, Xue; Li, Liang Zhi; Liu, Heng Wei; Guo, Wei; Yan, Li Shi; Fu, Jiao Long

doi:10.1080/10826068.2020.1848868

Cited by 12 publications

(9 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aspergillus fungi growing under aerobic condition ( 2, 25 ), which was consistent with A. tabacinus LZ-M reported in this study. The mycelium pellets and morphology are also similar to the Aspergillus species, such as A. niger and A. versicolor ( 26, 27 ).…”

Section: Resultssupporting

confidence: 90%

“…The degradation of AR73 to benzenes were mainly achieved by the cleavage of -C-N= bonds. A. versicolor LH1 degrades methyl red by breaking the -C-N= bond linked with benzene ( 2 ). Degradations of disperse yellow 3 and acid orange 7 by Phanerochaete chrysosporium are also achieved by the -C-N= cleavage ( 33 ).…”

Section: Resultsmentioning

confidence: 99%

“…Azo dyes are widely used as colorants in different fields of its properties, such as vivid colors, tinctorial strength, and ease of manufacturing, and approximately 450 000 tons of azo dyes are consumed annually ( 1, 2 ). Among 15% of dyes used in the industries are discharged into wastewater ( 3 ).…”

Section: Introductionmentioning

confidence: 99%

“…For example, benzo[a]pyrene is mineralized to CO 2 by the white rot fungus Pleurotus ostreatus ( 13 ). Aspergillus versicolor LH1 completely degrade methyl red at 200 mg/L of concentration ( 2 ), and A. niger decolorize acid blue 161 up to 58% ( 3 ). However, the decolorization of azo dyes are commonly more effective under anaerobic than aerobic conditions ( 9 ).…”

Section: Introductionmentioning

confidence: 99%

“…However, the decolorization of azo dyes are commonly more effective under anaerobic than aerobic conditions ( 9 ). This is because of the azo reduction enzyme for the initial cleavage of the azo bond sensitive to oxygen ( 2, 14 ). Similarly, the electron withdrawing nature of the azo bond impedes the susceptibility of dye molecules to oxidative reaction and, thus, azo dyes show resistance to aerobic biodegradation ( 14 ).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Anaerobic degradation of acid red 73 by obligately aerobic Aspergillus tabacinus LZ-M though a self-redox mechanism

Zong

Mao

et al. 2022

Preprint

View full text Add to dashboard Cite

Fungi are potential biological resources for refractory organics degradation, but their anaerobic degradation of azo dyes are rarely reported. In this study, a fungus Aspergillus tabacinus LZ-M was isolated grown aerobically and degraded acid red 73 (AR73) with a decolorization rate of 90.28% in 5 days at 400 mg/L of concentration anaerobically. Metabolic pathway showed that AR73 was reduced into 2-hydroxynaphthalene and aniline then mineralized into CO2. The anaerobic self-redox process revealed electrons generated in carbon oxidation and transferred to -C-N= and -N=N, resulting in complete mineralization of AR73 in strain LZ-M. Data of transcriptome analysis showed that the benzene compounds produced from AR73 by declorizing reductase entered the catechol pathway and glycolysis process to mineralize. Enzymes involved in aromatics degradation, glycolysis processes, cytochrome C and quinone oxidoreductases were up-regulate, but the key reductase responsible to cleave AR73 to phenylhydrazine was not found. A novel enzyme Ord95 containing a glutamate S-transferase domain was identified in the unknown genes as a reductase which cleaving -C-N= in AR73 using NADH as electron donor, and three arginines key active sites. These observations reveal a new degradation mechanism of AR73 in strain LZ-M which would be potential candidate for treatment of azo dyes wastewater.Graphical abstract

show abstract