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Wang D, Lou J, Xu J, Yuan J, Wang Q, Wang P, Fan X. Degradation of octylphenol polyethoxylates with a long ethoxylate chain using the laccase-mediated systems. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:37781-37792. [PMID: 33723784 DOI: 10.1007/s11356-021-13400-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 03/08/2021] [Indexed: 06/12/2023]
Abstract
Alkylphenol polyethoxylates (APEOn) are the second-largest category of commercial nonionic surfactants, which are difficult to degrade naturally in the environment. This study examined the degradation of octylphenol polyethoxylate (OPEOn) by laccase and its laccase-mediated systems. The results showed that OPEOn was poorly degraded by laccase alone. 2, 2'-azino-bis [3-ethylbenzothiazoline-6-sulphonic acid] (ABTS), 1-hydroxybenzotriazole (HBT), and 2, 2, 6, 6-tetramethylpiperidine-1-oxyl (TEMPO) were selected as the redox mediators. Experimental results also indicated that 52.4% of the initial OPEOn amount was degraded by laccase in the presence of TEMPO. The degradation efficiency was analyzed using high-performance liquid chromatography. Furthermore, the structural characteristics of the degradation products were measured using matrix-assisted laser desorption/ionization-time of flight mass spectrometry and nuclear magnetic resonance spectroscopy, and it could be found that the laccase-TEMPO system could gradually shorten the ethoxylate chain by oxidizing the primary hydroxyl group of OPEOn, thereby degrading the OPEOn of the macromolecule into small molecules. The maximum of the ion peak distributions of OPEOn decreased from n = 8 finally down to 3. The novel enzymatic system introduced by this study will become a promising alternative method for high-efficiency APEOn conversion and had great potential value in wastewater treatment.
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Affiliation(s)
- Dan Wang
- Key Laboratory of Science and Technology of Eco-Textile, Ministry of Education, Jiangnan University, 1800 Lihu AVE, Wuxi, 214122, Jiangsu, China
| | - Jiangfei Lou
- Key Laboratory of Science and Technology of Eco-Textile, Ministry of Education, Jiangnan University, 1800 Lihu AVE, Wuxi, 214122, Jiangsu, China
| | - Jin Xu
- Key Laboratory of Science and Technology of Eco-Textile, Ministry of Education, Jiangnan University, 1800 Lihu AVE, Wuxi, 214122, Jiangsu, China
| | - Jiugang Yuan
- Key Laboratory of Science and Technology of Eco-Textile, Ministry of Education, Jiangnan University, 1800 Lihu AVE, Wuxi, 214122, Jiangsu, China
| | - Qiang Wang
- Key Laboratory of Science and Technology of Eco-Textile, Ministry of Education, Jiangnan University, 1800 Lihu AVE, Wuxi, 214122, Jiangsu, China
| | - Ping Wang
- Key Laboratory of Science and Technology of Eco-Textile, Ministry of Education, Jiangnan University, 1800 Lihu AVE, Wuxi, 214122, Jiangsu, China
| | - Xuerong Fan
- Key Laboratory of Science and Technology of Eco-Textile, Ministry of Education, Jiangnan University, 1800 Lihu AVE, Wuxi, 214122, Jiangsu, China.
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Decembrino D, Girhard M, Urlacher VB. Use of Copper as a Trigger for the in Vivo Activity of E. coli Laccase CueO: A Simple Tool for Biosynthetic Purposes. Chembiochem 2021; 22:1470-1479. [PMID: 33332702 PMCID: PMC8248233 DOI: 10.1002/cbic.202000775] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 12/15/2020] [Indexed: 12/15/2022]
Abstract
Laccases are multi-copper oxidases that catalyze the oxidation of various electron-rich substrates with concomitant reduction of molecular oxygen to water. The multi-copper oxidase/laccase CueO of Escherichia coli is responsible for the oxidation of Cu+ to the less harmful Cu2+ in the periplasm. CueO has a relatively broad substrate spectrum as laccase, and its activity is enhanced by copper excess. The aim of this study was to trigger CueO activity in vivo for the use in biocatalysis. The addition of 5 mM CuSO4 was proven effective in triggering CueO activity at need with minor toxic effects on E. coli cells. Cu-treated E. coli cells were able to convert several phenolic compounds to the corresponding dimers. Finally, the endogenous CueO activity was applied to a four-step cascade, in which coniferyl alcohol was converted to the valuable plant lignan (-)-matairesinol.
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Affiliation(s)
- Davide Decembrino
- Institute of BiochemistryHeinrich-Heine University DüsseldorfUniversitätsstrasse 140225DüsseldorfGermany
| | - Marco Girhard
- Institute of BiochemistryHeinrich-Heine University DüsseldorfUniversitätsstrasse 140225DüsseldorfGermany
| | - Vlada B. Urlacher
- Institute of BiochemistryHeinrich-Heine University DüsseldorfUniversitätsstrasse 140225DüsseldorfGermany
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Udoro EO, Anyasi TA, Jideani AIO. Characterization of the root and flour of South African Manihot esculenta Crantz landraces and their potential end-use properties. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2020. [DOI: 10.1080/10942912.2020.1759625] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Elohor Oghenechavwuko Udoro
- Department of Food Science and Technology, School of Agriculture, University of Venda, Thohoyandou, 0950, Limpopo Province, South Africa
- Department of Food Technology, School of Industrial Technology, Akanu Ibiam Federal Polytechnic Afikpo-Unwana, Ebonyi State Nigeria
| | - Tonna Ashim Anyasi
- Department of Food Science and Technology, School of Agriculture, University of Venda, Thohoyandou, 0950, Limpopo Province, South Africa
| | - Afam Israel Obiefuna Jideani
- Department of Food Science and Technology, School of Agriculture, University of Venda, Thohoyandou, 0950, Limpopo Province, South Africa
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