Biodegradation最新文献_第8页

Microorganisms that produce enzymes active on biodegradable polyesters are ubiquitous 在生物可降解聚酯上产生活性酶的微生物无处不在

IF 3.6 4区生物学

Biodegradation Pub Date : 2023-06-24 DOI: 10.1007/s10532-023-10031-8

Francesco Degli-Innocenti, Tony Breton, Selene Chinaglia, Ermes Esposito, Marco Pecchiari, Andrea Pennacchio, Alessandro Pischedda, Maurizio Tosin

{"title":"Microorganisms that produce enzymes active on biodegradable polyesters are ubiquitous","authors":"Francesco Degli-Innocenti, Tony Breton, Selene Chinaglia, Ermes Esposito, Marco Pecchiari, Andrea Pennacchio, Alessandro Pischedda, Maurizio Tosin","doi":"10.1007/s10532-023-10031-8","DOIUrl":"10.1007/s10532-023-10031-8","url":null,"abstract":"<div><p>Biodegradability standards measure ultimate biodegradation of polymers by exposing the material under test to a natural microbial inoculum. Available tests developed by the International Organization for Standardization (ISO) use inoculums sampled from different environments e.g. soil, marine sediments, seawater. Understanding whether each inoculum is to be considered as microbially unique or not can be relevant for the interpretation of tests results. In this review, we address this question by consideration of the following: (i) the chemical nature of biodegradable plastics (virtually all biodegradable plastics are polyesters) (ii) the diffusion of ester bonds in nature both in simple molecules and in polymers (ubiquitous); (iii) the diffusion of decomposers capable of producing enzymes, called esterases, which accelerate the hydrolysis of esters, including polyesters (ubiquitous); (iv) the evidence showing that synthetic polyesters can be depolymerized by esterases (large and growing); (v) the evidence showing that these esterases are ubiquitous (growing and confirmed by bioinformatics studies). By combining the relevant available facts it can be concluded that if a certain polyester shows ultimate biodegradation when exposed to a natural inoculum, it can be considered biodegradable and need not be retested using other inoculums. Obviously, if the polymer does not show ultimate biodegradation it must be considered recalcitrant, until proven otherwise.</p></div>","PeriodicalId":486,"journal":{"name":"Biodegradation","volume":"34 6","pages":"489 - 518"},"PeriodicalIF":3.6,"publicationDate":"2023-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41080075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biodegradation of di-2-ethylhexyl phthalate by Bacillus firmus MP04 strain: parametric optimization using full factorial design 固体芽孢杆菌MP04菌株降解邻苯二甲酸二-2-乙基己酯的全因子设计参数优化

IF 3.6 4区生物学

Biodegradation Pub Date : 2023-06-24 DOI: 10.1007/s10532-023-10043-4

Madhavi Rashmi, Tanuja Singh, Nitesh Singh Rajput, Shweta Kulshreshtha

{"title":"Biodegradation of di-2-ethylhexyl phthalate by Bacillus firmus MP04 strain: parametric optimization using full factorial design","authors":"Madhavi Rashmi, Tanuja Singh, Nitesh Singh Rajput, Shweta Kulshreshtha","doi":"10.1007/s10532-023-10043-4","DOIUrl":"10.1007/s10532-023-10043-4","url":null,"abstract":"<div><p>Di-2-ethylhexyl phthalate (DEHP) is used as a plasticizer in making plastics and released from landfills. This study attempted to degrade DEHP using microbial isolates. Isolates of <i>Bacillus</i> spp. were tested for their efficacy in degrading DEHP. Degradation was assessed using liquid chromatography-mass spectrometry (LC–MS). The most efficient DEHP degradation was achieved by <i>Bacillus firmus</i> MP04, which has been identified as <i>Bacillus firmus</i> MP04. This strain was found to use DEHP as the sole source of carbon without carbon source supplementation. Full factorial design was used to optimize the conditions for DEHP degradation which revealed the suitability of pH 7, 5% salt concentration, 20 to 37 °C temperature, and yeast extract as a nitrogen source. LC–MS elucidated the possible degradation mechanism via benzoic acid formation. However, prolonged incubation formed a typical compound denatonium benzoate due to reactions with other compounds. As maximum degradation was achieved in 4 days, prolonged incubation is not suggested. It can be concluded that new strain <i>Bacillus firmus</i> MP04 is the most efficient strain among all the tested strains for DEHP degradation.</p></div>","PeriodicalId":486,"journal":{"name":"Biodegradation","volume":"34 6","pages":"567 - 579"},"PeriodicalIF":3.6,"publicationDate":"2023-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10532-023-10043-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41080221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of landfill food waste diversion: a focus on microbial populations and methane generation 垃圾填埋场食物垃圾转移的影响:对微生物种群和甲烷生成的关注

IF 3.6 4区生物学

Biodegradation Pub Date : 2023-06-20 DOI: 10.1007/s10532-023-10034-5

Giles Chickering, Max J. Krause, Amy Schwarber

{"title":"Effects of landfill food waste diversion: a focus on microbial populations and methane generation","authors":"Giles Chickering, Max J. Krause, Amy Schwarber","doi":"10.1007/s10532-023-10034-5","DOIUrl":"10.1007/s10532-023-10034-5","url":null,"abstract":"<div><p>The early stages of municipal solid waste degradation in landfills are complex harmonies of physical, biological, and chemical interactions that all work in concert to degrade trash into smaller and more stable materials. While many approaches have been taken to understand parts of this process, this new work attempted to simulate the early stages of landfills in controlled laboratory environments while observing the impacts of food waste content at different concentrations. This was completed by operating landfill lysimeters in a laboratory for approximately 1000 days, simulating landfill interior conditions while measuring the gas and liquid byproducts to study the impact of food waste presence in these environments. Metagenomic analysis after the experiment identified over 18,000 individual species and allowed comparison with past studies while also surveying microorganisms present in landfills. Similar populations found in past studies suggested the current experiments successfully replicated landfill conditions. While food waste diversion had a discernable impact on gas production, it did not show a clear and consistent impact on the microbiomes identified in this study.</p></div>","PeriodicalId":486,"journal":{"name":"Biodegradation","volume":"34 5","pages":"477 - 488"},"PeriodicalIF":3.6,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10532-023-10034-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4794553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microalgal conversion of whey and lactose containing substrates: current state and challenges 含有乳清和乳糖底物的微藻转化:现状和挑战

IF 3.6 4区生物学

Biodegradation Pub Date : 2023-06-17 DOI: 10.1007/s10532-023-10033-6

Sergejs Kolesovs, Pavels Semjonovs

{"title":"Microalgal conversion of whey and lactose containing substrates: current state and challenges","authors":"Sergejs Kolesovs, Pavels Semjonovs","doi":"10.1007/s10532-023-10033-6","DOIUrl":"10.1007/s10532-023-10033-6","url":null,"abstract":"<div><p>Currently dairy processing by-products, such as whey, still propose a significant threat to the environment if unproperly disposed. Microalgal bioconversion of such lactose containing substrates can be used for production of valuable microalgae-derived bio-products as well as for significant reduction of environmental risks. Moreover, it could significantly reduce microalgae biomass production costs, being a significant obstacle in commercialization of many microalgae species. This review summarizes current knowledge on the use of lactose containing substrates, e.g. whey, for the production of value-added products by microalgae, including information on producer cultures, fermentation methods and cultivation conditions, bioprocess productivity and ability of microalgal cultures to produce β-galactosidases. It can be stated, that despite several limitations lactose-containing substrates can be successfully used for both—the production of microalgal biomass and removal of high amounts of excess nutrients from the cultivation media. Moreover, co-cultivation of microalgae and other microorganisms can further increase the removal of nutrients and the production of biomass. Further investigations on lactose metabolism by microalgae, selection of suitable strains and optimisation of the cultivation process is required in order to enable large-scale microalgae production on these substrates.</p></div>","PeriodicalId":486,"journal":{"name":"Biodegradation","volume":"34 5","pages":"405 - 416"},"PeriodicalIF":3.6,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10532-023-10033-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4690095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Influence of growth substrate and contaminant mixtures on the degradation of BTEX and MTBE by Rhodococcus rhodochrous ATCC strain 21198 生长基质和污染物混合物对Rhodococcus rhodochrous ATCC菌株21198降解BTEX和MTBE的影响

IF 3.6 4区生物学

Biodegradation Pub Date : 2023-06-17 DOI: 10.1007/s10532-023-10037-2

Juliana M. Huizenga, Lewis Semprini

{"title":"Influence of growth substrate and contaminant mixtures on the degradation of BTEX and MTBE by Rhodococcus rhodochrous ATCC strain 21198","authors":"Juliana M. Huizenga, Lewis Semprini","doi":"10.1007/s10532-023-10037-2","DOIUrl":"10.1007/s10532-023-10037-2","url":null,"abstract":"<div><p>The degradation of the prevalent environmental contaminants benzene, toluene, ethylbenzene, and xylenes (BTEX) along with a common co-contaminant methyl tert-butyl ether (MTBE) by <i>Rhodococcus rhodochrous</i> ATCC Strain 21198 was investigated. The ability of 21198 to degrade these contaminants individually and in mixtures was evaluated with resting cells grown on isobutane, 1-butanol, and 2-butanol. Growth of 21198 in the presence of BTEX and MTBE was also studied to determine the growth substrate that best supports simultaneous microbial growth and contaminants degradation. Cells grown on isobutane, 1-butanol, and 2-butanol were all capable of degrading the contaminants, with isobutane grown cells exhibiting the most rapid degradation rates and 1-butanol grown cells exhibiting the slowest. However, in conditions where BTEX and MTBE were present during microbial growth, 1-butanol was determined to be an effective substrate for supporting concurrent growth and contaminant degradation. Contaminant degradation was found to be a combination of metabolic and cometabolic processes. Evidence for growth of 21198 on benzene and toluene is presented along with a possible transformation pathway. MTBE was cometabolically transformed to tertiary butyl alcohol, which was also observed to be transformed by 21198. This work demonstrates the possible utility of primary and secondary alcohols to support biodegradation of monoaromatic hydrocarbons and MTBE. Furthermore, the utility of 21198 for bioremediation applications has been expanded to include BTEX and MTBE.</p></div>","PeriodicalId":486,"journal":{"name":"Biodegradation","volume":"34 5","pages":"461 - 475"},"PeriodicalIF":3.6,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4684824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of copper, arsenic and nickel on pyrite-based autotrophic denitrification 铜、砷和镍对黄铁矿自养反硝化作用的影响。

IF 3.1 4区生物学

Biodegradation Pub Date : 2023-04-28 DOI: 10.1007/s10532-023-10027-4

Maria F. Carboni, Sonia Arriaga, Piet N. L. Lens

{"title":"Effect of copper, arsenic and nickel on pyrite-based autotrophic denitrification","authors":"Maria F. Carboni, Sonia Arriaga, Piet N. L. Lens","doi":"10.1007/s10532-023-10027-4","DOIUrl":"10.1007/s10532-023-10027-4","url":null,"abstract":"<div><p>Pyritic minerals generally occur in nature together with other trace metals as impurities, that can be released during the ore oxidation. To investigate the role of such impurities, the presence of copper (Cu(II)), arsenic (As(III)) and nickel (Ni(II)) during pyrite mediated autotrophic denitrification has been explored in this study at 30 °C with a specialized microbial community of denitrifiers as inoculum. The three metal(loid)s were supplemented at an initial concentration of 2, 5, and 7.5 ppm and only Cu(II) had an inhibitory effect on the autotrophic denitrification. The presence of As(III) and Ni(II) enhanced the nitrate removal efficiency with autotrophic denitrification rates between 3.3 [7.5 ppm As(III)] and 1.6 [7.5 ppm Ni(II)] times faster than the experiment without any metal(loid) supplementation. The Cu(II) batches, instead, decreased the denitrification kinetics with 16, 40 and 28% compared to the no-metal(loid) control for the 2, 5 and 7.5 ppm incubations, respectively. The kinetic study revealed that autotrophic denitrification with pyrite as electron donor, also with Cu(II) and Ni(II) additions, fits better a zero-order model, while the As(III) incubation followed first-order kinetic. The investigation of the extracellular polymeric substances content and composition showed more abundance of proteins, fulvic and humic acids in the metal(loid) exposed biomass.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":486,"journal":{"name":"Biodegradation","volume":"35 1","pages":"101 - 114"},"PeriodicalIF":3.1,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10774168/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9362412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Association of Laccase from Bacillus cereus O2-B and Pseudomonas aeruginosa O1-P with the bio-degradation of polymers: an in vitro to in silico approach 蜡样芽孢杆菌O2-B和铜绿假单胞菌O1-P漆酶与聚合物生物降解的关系:体外到体内的方法

IF 3.6 4区生物学

Biodegradation Pub Date : 2023-04-14 DOI: 10.1007/s10532-023-10028-3

M Shafana Farveen, Thirumurthy Madhavan, Rajnish Narayanan

{"title":"Association of Laccase from Bacillus cereus O2-B and Pseudomonas aeruginosa O1-P with the bio-degradation of polymers: an in vitro to in silico approach","authors":"M Shafana Farveen, Thirumurthy Madhavan, Rajnish Narayanan","doi":"10.1007/s10532-023-10028-3","DOIUrl":"10.1007/s10532-023-10028-3","url":null,"abstract":"<div><p>Plastic accumulation has become a serious environmental threat. Mitigation of plastic is important to save the ecosystem of our planet. With current research being focused on microbial degradation of plastics, microbes with the potential to degrade polyethylene were isolated in this study. In vitro studies were performed to define the correlation between the degrading capability of the isolates and laccase, a common oxidase enzyme. Instrumental analyses were used to evaluate morphological and chemical modifications in polyethylene, which demonstrated a steady onset of the degradation process in case of both isolates, <i>Pseudomonas aeruginosa</i> O1-P and <i>Bacillus cereus</i> O2-B. To understand the efficiency of laccase in degrading other common polymers, in silico approach was employed, for which 3D structures of laccase in both the isolates were constructed via homology modeling and molecular docking was performed, revealing that the enzyme laccase can be exploited to degrade a wide range of polymers.</p><h3>Graphical abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":486,"journal":{"name":"Biodegradation","volume":"34 4","pages":"383 - 403"},"PeriodicalIF":3.6,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4559449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Effect of ultra-violet light radiation on Scenedesmus vacuolatus growth kinetics, metabolic performance, and preliminary biodegradation study 紫外线辐射对空泡藻（Scenedesmus vacuolatus）生长动力学、代谢性能和初步生物降解研究的影响。

IF 3.1 4区生物学

Biodegradation Pub Date : 2023-04-13 DOI: 10.1007/s10532-023-10029-2

Stella B. Eregie, Isaac A. Sanusi, Gueguim E. B. Kana, Ademola O. Olaniran

{"title":"Effect of ultra-violet light radiation on Scenedesmus vacuolatus growth kinetics, metabolic performance, and preliminary biodegradation study","authors":"Stella B. Eregie, Isaac A. Sanusi, Gueguim E. B. Kana, Ademola O. Olaniran","doi":"10.1007/s10532-023-10029-2","DOIUrl":"10.1007/s10532-023-10029-2","url":null,"abstract":"<div><p>This study presents the effect of ultra-violet (UV) light radiation on the process kinetics, metabolic performance, and biodegradation capability of <i>Scenedesmus vacuolatus</i>. The impact of the UV radiation on <i>S. vacuolatus</i> morphology, chlorophyll, carotenoid, carbohydrates, proteins, lipid accumulation, growth rate, substrate affinity and substrate versatility were evaluated. Thereafter, a preliminary biodegradative potential of UV-exposed <i>S. vacuolatus</i> on spent coolant waste (SCW) was carried out based on dehydrogenase activity (DHA) and total petroleum hydrocarbon degradation (TPH). Pronounced structural changes were observed in <i>S. vacuolatus</i> exposed to UV radiation for 24 h compared to the 2, 4, 6, 12 and 48 h UV exposure. Exposure of <i>S. vacuolatus</i> to UV radiation improved cellular chlorophyll (chla = 1.89-fold, chlb = 2.02-fold), carotenoid (1.24-fold), carbohydrates (4.62-fold), proteins (1.44-fold) and lipid accumulations (1.40-fold). In addition, the 24 h UV exposed <i>S. vacuolatus</i> showed a significant increase in substrate affinity (1/Ks) (0.959), specific growth rate (µ) (0.024 h<sup>−1</sup>) and biomass accumulation (0.513 g/L) by 1.50, 2 and 1.9-fold respectively. Moreover, enhanced DHA (55%) and TPH (100%) degradation efficiency were observed in UV-exposed <i>S. vacuolatus</i>. These findings provided major insights into the use of UV radiation to enhance <i>S. vacuolatus</i> biodegradative performance towards sustainable green environment negating the use of expensive chemicals and other unfriendly environmental practices.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":486,"journal":{"name":"Biodegradation","volume":"35 1","pages":"71 - 86"},"PeriodicalIF":3.1,"publicationDate":"2023-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10774200/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9283424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Isolation of cadmium-resistant microbial strains and their immobilisation of cadmium in soil 抗镉微生物菌株的分离及其对土壤中镉的固定化作用

IF 3.6 4区生物学

Biodegradation Pub Date : 2023-04-12 DOI: 10.1007/s10532-023-10026-5

Ruijuan Fan, Weixia Xie, Heqin Ma, Mengke Zhu, Kun Ma, Xingfu Yan

{"title":"Isolation of cadmium-resistant microbial strains and their immobilisation of cadmium in soil","authors":"Ruijuan Fan, Weixia Xie, Heqin Ma, Mengke Zhu, Kun Ma, Xingfu Yan","doi":"10.1007/s10532-023-10026-5","DOIUrl":"10.1007/s10532-023-10026-5","url":null,"abstract":"<div><p>Six cadmium (Cd)-resistant microbial strains were isolated and their ability to immobilise Cd<sup>2+</sup> in soil investigated. Cd-1, Cd-2, Cd-5, and Cd-6 were identified as <i>Stenotrophomonas</i> sp., Cd-3 as <i>Achromobacter</i> sp., and Cd-7 as <i>Staphylococcus</i> sp. The six strains showed a wide adaptation range for salinity and a strong tolerance to Cd<sup>2+</sup>. The effects of the initial Cd<sup>2+</sup> concentration (1–100 mg/L), duration (18–72 h), temperature (10–40 °C), and pH (5.0–9.0) on the efficiency of Cd<sup>2+</sup> removal were analysed. The results revealed that the Cd<sup>2+</sup> removal rate was higher at an initial Cd<sup>2+</sup> concentration of 5–100 mg/L than at 1 mg/L. The maximum Cd<sup>2+</sup> removal effect was at a culture duration of 36 h, temperature of 10–35 °C, and pH of 5.0–7.0. X-ray diffraction (XRD) analysis revealed that the Cd<sup>2+</sup> was immobilised by <i>Stenotrophomonas</i> sp. Cd-2 and <i>Staphylococcus</i> sp. Cd-7 through bio-precipitation. X-ray photoelectron spectroscopy (XPS) revealed that the Cd<sup>2+</sup> was adsorbed by <i>Stenotrophomonas</i> sp. Cd-2, <i>Achromobacter</i> sp. Cd-3, and <i>Staphylococcus</i> sp. Cd-7. Fourier transform infrared spectroscopy (FTIR) analysis revealed that the isolates reacted with the Cd<sup>2+</sup> mainly through the O–H, protein N–H, C–N, lipid C–H, fatty acid COO, polysaccharide C–O, P–O, and other functional groups, as well as with lipid molecules on the cell wall surfaces. Scanning electron microscopy (SEM) analysis revealed that there was little difference in the cells after Cd<sup>2+</sup> treatment. The results of the soil remediation experiments indicated that the toxicity of Cd in soil could be effectively reduced using certain strains of microbe.</p><h3>Graphical abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":486,"journal":{"name":"Biodegradation","volume":"34 5","pages":"445 - 459"},"PeriodicalIF":3.6,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4784436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Plasticizer phthalate esters degradation with a laccase from Trametes versicolor: effects of TEMPO used as a mediator and estrogenic activity removal 用漆酶降解紫苔菌的增塑剂邻苯二甲酸酯:TEMPO作为介质和雌激素活性去除的影响

IF 3.6 4区生物学

Biodegradation Pub Date : 2023-04-05 DOI: 10.1007/s10532-023-10030-9

Dan Wang, Ruofei Zhu, Jiangfei Lou, Nawon Baek, Xuerong Fan

{"title":"Plasticizer phthalate esters degradation with a laccase from Trametes versicolor: effects of TEMPO used as a mediator and estrogenic activity removal","authors":"Dan Wang, Ruofei Zhu, Jiangfei Lou, Nawon Baek, Xuerong Fan","doi":"10.1007/s10532-023-10030-9","DOIUrl":"10.1007/s10532-023-10030-9","url":null,"abstract":"<div><p>Phthalate esters (PAEs) are toxic and persistent chemicals that are ubiquitous in the environment and have attracted worldwide attention due to their threats to the environment and human health. Dimethyl phthalate (DMP) is a relatively simple structure and one of the most observed PAEs in the environment. This study investigated the degradation of the DMP using <i>Trametes versicolor</i> laccase and its laccase-mediator systems. The degradation effect of laccase alone on DMP was poor, while the laccase-mediator systems can effectively enhance the degradation efficiency. Within 24 h, 45% of DMP (25 mg/L) was degraded in the presence of 0.8 U/mL laccase and 0.053 mM 2, 2, 6, 6-tetramethylpiperidine-1-oxyl (TEMPO). A certain concentration (1 mM) of metal ions Al<sup>3+</sup>, Cu<sup>2+</sup> or Ca<sup>2+</sup> can positively promote DMP degradation with the laccase-TEMPO system. Moreover, the structure of PAEs also had a great influence on the degradation efficiency. Higher degradation efficiencies were observed when incubating PAEs with short alkyl side chains by the laccase-TEMPO system compared to that with long alkyl side chains. Additionally, the branched-chain PAEs had a better degradation effect than the straight-chain. The estrogenic activity of the DMP solution after reaction was much smaller than that of the original solution. Finally, transformation products ortho-hydroxylated DMP and phthalic acid were identified by GC–MS and the possible degradation pathway was proposed. This study verifies the feasibility of the laccase-TEMPO system to degrade PAEs and provides a reference for exploring more potential value of laccase.</p></div>","PeriodicalId":486,"journal":{"name":"Biodegradation","volume":"34 5","pages":"431 - 444"},"PeriodicalIF":3.6,"publicationDate":"2023-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4197858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1