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| Transformation of p-arsanilic acid by laccase catalyzed oxidation process |
| Received:November 15, 2015 |
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| KeyWord:p-arsanilic;laccase;catechol;syringic acid;necleuphilic addition |
| Author Name | Affiliation | E-mail | | SHI Yuan-yuan | 1. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | JI Yue-fei | 1. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | LU Jun-he | 1. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | jhlu@njau.edu.cn |
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| Abstract: |
| p-Arsanilic acid(ARS), a veterinary feed additive promoting growth, may contaminate the environment. In the present study, transformation of ARS by laccase catalyzed oxidation process was investigated in the presence of catechol and syringic acid as representative humic constituents. Laccase alone could not decompose ARS. However, the presence of catechol or syringic acid facilitated ARS transformation. Fourier transform infred spectra(FTIR) and mass spectra(MS) analysis revealed that ARS was degraded via the formation of covalent bonds with quinone intermediates upon oxidation of catechol and syringic acid by laccase. In general, the reaction was a nucleophilic addition process with the aniline N acting as necleophile attacking the α-carbon of the carbonyl group in the quinone molecules. The present findings suggest a transformation pathway of ARS in environment in addition to biodegradation and photolysis. |
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