Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering最新文献_第9页

Membrane separation of antibiotics predicted with the back propagation neural network. 应用反向传播神经网络预测抗生素的膜分离。

IF 2.1 4区环境科学与生态学

Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering Pub Date : 2023-01-01 Epub Date: 2023-04-18 DOI: 10.1080/10934529.2023.2200719

Mixuan Ye, Haidong Zhou, Xinxuan Xu, Lidan Pang, Yunjia Xu, Jingyuan Zhang, Danyan Li

{"title":"Membrane separation of antibiotics predicted with the back propagation neural network.","authors":"Mixuan Ye, Haidong Zhou, Xinxuan Xu, Lidan Pang, Yunjia Xu, Jingyuan Zhang, Danyan Li","doi":"10.1080/10934529.2023.2200719","DOIUrl":"10.1080/10934529.2023.2200719","url":null,"abstract":"Antibiotics and antibiotic resistance genes (ARGs) have been frequently detected in the aquatic environment and are regarded as emerging pollutants. The prediction models for the removal effect of four target antibiotics by membrane separation technology were constructed based on back propagation neural network (BPNN) through training the input and output. The membrane separation tests of antibiotics showed that the removal effect of microfiltration on azithromycin and ciprofloxacin was better, basically above 80%. For sulfamethoxazole (SMZ) and tetracycline (TC), ultrafiltration and nanofiltration had better removal effects. There was a strong correlation between the concentrations of SMZ and TC in the permeate, and the R2 of the training and validation processes exceeded 0.9. The stronger the correlation between the input layer variables and the prediction target was, the better the prediction performances of the BPNN model than the nonlinear model and the unscented Kalman filter model were. These results showed that the established BPNN prediction model could better simulate the removal of target antibiotics by membrane separation technology. The model could be used to predict and explore the influence of external conditions on membrane separation technology and provide a certain basis for the application of the BPNN model in environmental protection.","PeriodicalId":15671,"journal":{"name":"Journal of Environmental Science and Health Part A-toxic\\/hazardous Substances & Environmental Engineering","volume":"58 6","pages":"538-549"},"PeriodicalIF":2.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9467831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Accumulation and distribution of heavy metals in soil and food crops in the Pb-Zn mine environ. Case study: Region of Probištip, North Macedonia. 铅锌矿环境中重金属在土壤和粮食作物中的积累和分布。案例研究：北马其顿普罗比什蒂普地区。

IF 2.1 4区环境科学与生态学

Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering Pub Date : 2023-01-01 DOI: 10.1080/10934529.2023.2174331

Trajče Stafilov, Katerina Stojanova, Krste Таšev, Katerina Bačeva Andonovska

{"title":"Accumulation and distribution of heavy metals in soil and food crops in the Pb-Zn mine environ. Case study: Region of Probištip, North Macedonia.","authors":"Trajče Stafilov, Katerina Stojanova, Krste Таšev, Katerina Bačeva Andonovska","doi":"10.1080/10934529.2023.2174331","DOIUrl":"https://doi.org/10.1080/10934529.2023.2174331","url":null,"abstract":"The aim of the study was to investigate the exploration and distribution of various chemical elements in soils and vegetables from gardens in the region of Probištip, North Macedonia. This region was exposed to heavy metals pollution from Pb-Zn mining and flotation tailings landfill near the town of Probištip for 70 years. A total of 38 samples of various crops and vegetable products from 19 gardens were analyzed. The analyzes were carried out by ICP-AES (Al, Ba, Ca, Cr, Cu, Fe, K, Li, Mg, Mn, Na, Ni, P, Pb, Sr, V, and Zn) and by ICP-MS (As, Cd, Co, Cr, and Pb). It was found that the content of some potentially toxic elements (As, Cd, Cu, Pb, and Zn) in the soil samples from the gardens, exceeded the target values. From these results, it is clear that the contamination of the soils in this area is due to mining activities and the distribution of flotation wastes from the nearby flotation dump. It was also found that the contaminated soils lead to elevated levels of these elements in some vegetables from the gardens, especially those near the Zletovska River and the flotation waste landfill, exceeding the nationally permissible food content.","PeriodicalId":15671,"journal":{"name":"Journal of Environmental Science and Health Part A-toxic\\/hazardous Substances & Environmental Engineering","volume":"58 3","pages":"171-182"},"PeriodicalIF":2.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9162363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biosorption of cadmium from aqueous solution by combination of microorganisms and chitosan: response surface methodology for optimization of removal conditions. 微生物与壳聚糖联合吸附镉的研究:响应面法优化去除条件。

IF 2.1 4区环境科学与生态学

Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering Pub Date : 2023-01-01 DOI: 10.1080/10934529.2023.2188023

Elham Khanniri, Mojtaba Yousefi, Amir Mohammad Mortazavian, Nasim Khorshidian, Sara Sohrabvandi, Mohammad Reza Koushki, Saeideh Esmaeili

{"title":"Biosorption of cadmium from aqueous solution by combination of microorganisms and chitosan: response surface methodology for optimization of removal conditions.","authors":"Elham Khanniri, Mojtaba Yousefi, Amir Mohammad Mortazavian, Nasim Khorshidian, Sara Sohrabvandi, Mohammad Reza Koushki, Saeideh Esmaeili","doi":"10.1080/10934529.2023.2188023","DOIUrl":"https://doi.org/10.1080/10934529.2023.2188023","url":null,"abstract":"The food-grade adsorbents of Saccharomyces cerevisiae (108 CFU/mL), Bifidobacterium longum (108 CFU/mL) and chitosan (1%w/v) alone or in combination were used for biosorption of cadmium (Cd) from aqueous solution. Among the tested adsorbents, combination of B. longum and chitosan had the highest efficiency. Therefore, biosorption process with B. longum/chitosan as the most efficient biosorbent was optimized by variables of pH (3-6), temperature (4-37 °C), contact time (5-180 min) and Cd concentrations (0.01-5 mg/L) using RSM. Twenty-seven tests were carried out and the data fitted to the second-order polynomial models. Results revealed that 99.11% of Cd was reduced within 180 min at concentration of 2.5 mg/L, pH 6 and temperature of 20.5 °C that were considered as the optimal conditions for Cd removal. The trend of isotherm was more fitted to the Langmuir model and maximum biosorption capacity was obtained about 3.61 mg/g. The pseudo-second-order fitted the biosorption kinetics for Cd ions. The B. longum/chitosan biosorbent exhibited the high affinity to Cd ion in the presence of coexisting metal ions. It could remove 81.18% of Cd from simulated gastrointestinal tract. Thus, B. longum/chitosan can have good potential as an effective adsorbent for Cd biosorption from aqueous solutions and human body.","PeriodicalId":15671,"journal":{"name":"Journal of Environmental Science and Health Part A-toxic\\/hazardous Substances & Environmental Engineering","volume":"58 5","pages":"433-446"},"PeriodicalIF":2.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9400255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Evaluation of ciprofloxacin (CIP) and clarithromycin (CLA) adsorption with weathered PVC microplastics. 风化聚氯乙烯微塑料吸附环丙沙星(CIP)和克拉霉素(CLA)的性能评价。

IF 2.1 4区环境科学与生态学

Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering Pub Date : 2023-01-01 DOI: 10.1080/10934529.2023.2198475

Duygu Osman, İbrahim Uyanık, Hamdi Mıhçıokur, Oktay Özkan

{"title":"Evaluation of ciprofloxacin (CIP) and clarithromycin (CLA) adsorption with weathered PVC microplastics.","authors":"Duygu Osman, İbrahim Uyanık, Hamdi Mıhçıokur, Oktay Özkan","doi":"10.1080/10934529.2023.2198475","DOIUrl":"https://doi.org/10.1080/10934529.2023.2198475","url":null,"abstract":"The sorption kinetics of two of the most frequently used antibiotics onto recycled (weathered) polyvinyl chloride (PVC) was investigated, using Freundlich and Langmuir isotherm models. Various experimental conditions were set, including pH, contact time, rotational speed, temperature, and initial concentration. The batch experimental results indicated that Freundlich model was better fitted than Langmuir (R2: 98.7 and 84.7, for CIP and CLA respectively). Maximum adsorption capacity is 45.9 mg/g and 22.0 mg/g for CIP and CLA, respectively. Enthalpy (ΔH), and entropy (ΔS) values were negative for CIP, indicating that the reaction was exothermic and spontaneous, respectively. It was vice versa for CLA. Field emission scanning electron microscope (FESEM) and Fourier transform infrared spectrometer (FT-IR) analysis confirmed the physical adsorption mechanism. The results demonstrated that the recycled PVC microplastic has a good capacity for adsorption for both antibiotics.","PeriodicalId":15671,"journal":{"name":"Journal of Environmental Science and Health Part A-toxic\\/hazardous Substances & Environmental Engineering","volume":"58 5","pages":"498-505"},"PeriodicalIF":2.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9440248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Evaluation of the research trends on perfluorinated compounds using bibliometric analysis: knowledge gap and future perspectives. 利用文献计量学分析评价全氟化合物的研究趋势:知识差距和未来展望。

IF 2.1 4区环境科学与生态学

Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering Pub Date : 2023-01-01 DOI: 10.1080/10934529.2023.2203639

Cecilia Y Ojemaye, Mike O Ojemaye, Anthony I Okoh, Omobola O Okoh

{"title":"Evaluation of the research trends on perfluorinated compounds using bibliometric analysis: knowledge gap and future perspectives.","authors":"Cecilia Y Ojemaye, Mike O Ojemaye, Anthony I Okoh, Omobola O Okoh","doi":"10.1080/10934529.2023.2203639","DOIUrl":"https://doi.org/10.1080/10934529.2023.2203639","url":null,"abstract":"Detection of perfluorinated compounds (PFCs) in the environment has been a global concern because of the risk they pose due to their endocrine-disruptive properties. This study analyzed the global trends and research productivity of PFCs from 1990 to 2021. A total number of 3256 articles on PFCs were retrieved from the Web of Science focusing on different environmental and biological matrices. An increase in the productivity of research on PFCs was observed during the survey period which indicates that more research and publications on this class of contaminants are expected in the future. Evaluating the most productive countries and the number of citations per country on PFCs research shows that China and the United States of America were ranked in first and second places. It was also observed that research on PFCs received the most attention from scientists in developed countries, with little research emerging from Africa. Hence, research on PFCs in developing countries, especially low-income countries should be promoted. Consequently, more research programs should be implemented to investigate PFCs in countries and regions where research on these contaminants is low. The study will help researchers, government agencies and policymakers to tailor future research, allocation of funds to PFCs research and countries' collaboration.","PeriodicalId":15671,"journal":{"name":"Journal of Environmental Science and Health Part A-toxic\\/hazardous Substances & Environmental Engineering","volume":"58 6","pages":"570-595"},"PeriodicalIF":2.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9521615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Health risk study of cadmium, chromium, lead and arsenic in reservoir water of Changzhou, China. 常州市水库水中镉、铬、铅、砷的健康风险研究

IF 2.1 4区环境科学与生态学

Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering Pub Date : 2023-01-01 DOI: 10.1080/10934529.2023.2206772

Yue-Fang Chen, Meng-Xue He, Hui-Min Feng, Qian Liu, Jin-Xiu Chen, Tong Li

{"title":"Health risk study of cadmium, chromium, lead and arsenic in reservoir water of Changzhou, China.","authors":"Yue-Fang Chen, Meng-Xue He, Hui-Min Feng, Qian Liu, Jin-Xiu Chen, Tong Li","doi":"10.1080/10934529.2023.2206772","DOIUrl":"https://doi.org/10.1080/10934529.2023.2206772","url":null,"abstract":"Accurately assessing the health risks of human exposure to heavy metals via water is of great importance for performing targeted health risk prevention measures. To better understand the concentration characteristics and potential harm to human health of cadmium, chromium, lead and arsenic in the main drinking water-type reservoirs of Changzhou city, we collected samples from the Haidi Reservoir, Dongjin Reservoir, Xinfushan Reservoir, Maodong Reservoir and Xiangyang Reservoir of Changzhou in the summer of 2019. The results showed that the daily average comprehensive exposure level of metals was much lower than the provisional tolerated daily intake (PTDI), i.e., Cd: 1 µg kg-1 d-1; Cr: 3 µg kg-1 d-1; Pb: 3.57 µg kg-1 d-1; and As: 2.14 µg kg-1 d-1. The comprehensive non-carcinogenic risk levels of four metals under water-drinking exposure and water-skin exposure routes ranged from 4.68E - 3 to 1.69E - 1, and the carcinogenic risk ranged from 2.09E - 5 to 7.30E - 5, which were all at acceptable risk levels. Although lead and chromium were present at acceptable health risk levels, they still represented the main pollutants of potential health risk in the local water environment from a non-carcinogenic or carcinogenic perspective, and they should be listed as the primary targets for water environmental risk management.","PeriodicalId":15671,"journal":{"name":"Journal of Environmental Science and Health Part A-toxic\\/hazardous Substances & Environmental Engineering","volume":"58 7","pages":"680-693"},"PeriodicalIF":2.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9660592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Neuro-protective potentials of N-acetylcysteine and zinc against di(2-ethylhexyl)-phthalate-induced neuro-histopathology and dys-regulations of Dopamine and Glutamate in rat brain. n -乙酰半胱氨酸和锌对邻苯二甲酸二(2-乙基己基)-邻苯二甲酸酯诱导的大鼠脑神经组织病理学和多巴胺和谷氨酸调节异常的神经保护作用

IF 2.1 4区环境科学与生态学

Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering Pub Date : 2023-01-01 DOI: 10.1080/10934529.2023.2177449

Adelaja Akinlolu, Victor Emejovwe, Raphael Uwejigho, Juliet Ilesanmi, Rokibat Owolabi, Abimbola Igandan

{"title":"Neuro-protective potentials of N-acetylcysteine and zinc against di(2-ethylhexyl)-phthalate-induced neuro-histopathology and dys-regulations of Dopamine and Glutamate in rat brain.","authors":"Adelaja Akinlolu, Victor Emejovwe, Raphael Uwejigho, Juliet Ilesanmi, Rokibat Owolabi, Abimbola Igandan","doi":"10.1080/10934529.2023.2177449","DOIUrl":"https://doi.org/10.1080/10934529.2023.2177449","url":null,"abstract":"This study examined neuro-protective potentials of N-acetyl-cysteine (NAC) and Zinc on expression levels of Dopamine and Glutamate in the Cerebrum, Hypothalami and Pituitary Glands in Di(2-ethylhexyl)-phthalate (DEHP)-induced neurotoxicity in rats. Thirty-six adult male Wistar rats were randomly divided into 6 groups (n = 6). Group 1 was control. Groups 2-6 received oral administrations of 100 mg/kg NAC, 0.5 mg/kg Zinc, 750 mg/kg DEHP, DEHP + NAC doses and DEHP + Zinc doses respectively for 21 days. Brain histology (Heamatoxyline and Eosine technique), histochemical and enzyme-linked-immunosorbent assays of Dopamine and Glutamate in homogenates of Cerebrum, Hypothalami and Pituitary Glands were evaluated. Data were statistically analyzed using One-way-ANOVA with Tukey-post-hoc test at p ≤ 0.05. Histo-pathological evaluations of Cerebrum, Hypothalami and Pituitary Glands showed gross histo-alterations and neurodegenerative changes (Group 4), mild histo- and neuro-degenerative changes (Groups 5 and 6) and normal histology (Group 1). Histochemical analyses showed higher Dopamine levels in Hypothalami (Group 5) and Pituitary Glands (Groups 5 and 6), compared with Group 4. Furthermore, results showed lower Glutamate levels in Cerebrum, Hypothalami and Pituitary Glands of Groups 5 and 6, compared with Group 4. Overall, NAC and Zinc conferred neuro-protection and histo-protection against DEHP-induced neuro-toxicity, neuro-histopathology, decreased Dopamine levels and increased Glutamate levels.","PeriodicalId":15671,"journal":{"name":"Journal of Environmental Science and Health Part A-toxic\\/hazardous Substances & Environmental Engineering","volume":"58 1","pages":"81-90"},"PeriodicalIF":2.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9127484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Toxicological effects of hydroxychloroquine sulfate and chloroquine diphosphate substances on the early-life stages of fish in the COVID-19 pandemic context. 在COVID-19大流行背景下，硫酸羟氯喹和二磷酸氯喹物质对鱼类早期生命阶段的毒理学影响

IF 2.1 4区环境科学与生态学

Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering Pub Date : 2023-01-01 DOI: 10.1080/10934529.2023.2238587

Isabella Ferreira Silva, Keiza Priscila Enes, Gustavo Machado Rocha, Fernando Pilla Varotti, Leandro Augusto Barbosa, Ralph Gruppi Thomé, Hélio Batista Dos Santos

{"title":"Toxicological effects of hydroxychloroquine sulfate and chloroquine diphosphate substances on the early-life stages of fish in the COVID-19 pandemic context.","authors":"Isabella Ferreira Silva, Keiza Priscila Enes, Gustavo Machado Rocha, Fernando Pilla Varotti, Leandro Augusto Barbosa, Ralph Gruppi Thomé, Hélio Batista Dos Santos","doi":"10.1080/10934529.2023.2238587","DOIUrl":"https://doi.org/10.1080/10934529.2023.2238587","url":null,"abstract":"Hydroxychloroquine sulfate (HCQ) and chloroquine diphosphate (CQ) have been used at increased rates to treat COVID-19 but can constitute a potential environmental risk. The objective was to evaluate the toxicity of sublethal concentrations of HCQ and CQ in zebrafish embryos/larvae. The 50% lethal concentrations (LC50) of HCQ and CQ at 96 h post-fertilization (hpf) were calculated by testing various concentrations on 2,160 embryos. The LC50 obtained were 560 and 800 µM for HCQ and CQ, respectively. Next, the embryotoxicity assay was performed, where 1,200 embryos were subjected to sublethal concentrations of HCQ and CQ. The hatching and heart rates were recorded. After euthanasia, photomicrographs of all larvae were taken to measure the total length, pericardial and yolk sac areas. The embryos exposed to sublethal concentrations of HCQ and CQ showed delayed hatching at 72 hpf, as well as an increase in the heart rate, larger pericardial and yolk sac areas, and body malformations at 96 hpf. The findings show that HCQ and CQ are toxic to fish in the early development phases. Understanding the mechanisms of toxicity will help extrapolate the effects of 4-aminoquinoline derivatives when they reach the aquatic environment in the context of the COVID-19 pandemic.","PeriodicalId":15671,"journal":{"name":"Journal of Environmental Science and Health Part A-toxic\\/hazardous Substances & Environmental Engineering","volume":"58 10","pages":"825-830"},"PeriodicalIF":2.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10027891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving the practicality of recombinant Escherichia coli biosensor in detecting trace Cr(VI) by modifying the cryogenic storage conditions of biosensors and applying simple pretreatment. 通过改变生物传感器的低温储存条件和应用简单的预处理，提高重组大肠杆菌生物传感器检测痕量六价铬的实用性。

IF 2.1 4区环境科学与生态学

Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering Pub Date : 2023-01-01 Epub Date: 2024-02-01 DOI: 10.1080/10934529.2024.2301905

Guey-Horng Wang, Chi-Hsiang Tang, Chiu-Yu Cheng, Ying-Chien Chung

{"title":"Improving the practicality of recombinant Escherichia coli biosensor in detecting trace Cr(VI) by modifying the cryogenic storage conditions of biosensors and applying simple pretreatment.","authors":"Guey-Horng Wang, Chi-Hsiang Tang, Chiu-Yu Cheng, Ying-Chien Chung","doi":"10.1080/10934529.2024.2301905","DOIUrl":"10.1080/10934529.2024.2301905","url":null,"abstract":"Hexavalent chromium (Cr(VI)) is a global environmental pollutant. To reduce the risk caused by Cr(VI), a simple, accurate, reproducible, and inexpensive method for quantifying Cr(VI) in water and soil should be developed. In this study, three types of recombinant Escherichia coli biosensors (namely T7-lux-E. coli, T3-lux-E. coli, and SP6-lux-E. coli biosensor) containing promoters (T7, T3, and SP6), chromate-sensing regulator chrB, and the reporter gene luxAB were constructed. This study investigated the effects of cryogenic freezing temperature and time on trace Cr(VI) measurement by using recombinant E. coli biosensors. The results indicated that the activity of thawed frozen SP6-lux-E. coli cells stored at -20 °C for 270 days did not differ from that of freshly prepared cells. Turbidity and conductivity in water samples and organic matter in soil interfered with Cr(VI) measurement using the biosensor. The SP6-lux-E. coli biosensor exhibited a wide measurement range and a low deviation of <5% for measuring Cr(VI) in various Cr(VI)-contaminated water and soil samples and required only a simple pretreatment or extraction process even after 270-day storage at -20 °C. To the best of our knowledge, this is the first study to report the use of recombinant biosensors for accurately measuring Cr(VI) in both water and soil.","PeriodicalId":15671,"journal":{"name":"Journal of Environmental Science and Health Part A-toxic\\/hazardous Substances & Environmental Engineering","volume":" ","pages":"1028-1038"},"PeriodicalIF":2.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139377743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In situ capping of silver nanoparticles with cellulosic matrices from wheat straws in enhancing their antimicrobial activity: Synthesis and characterization. 用麦秆纤维素基质原位封端银纳米粒子以增强其抗菌活性：合成和表征。

IF 2.1 4区环境科学与生态学

Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering Pub Date : 2023-01-01 Epub Date: 2023-10-12 DOI: 10.1080/10934529.2023.2260295

Shappo Tlou, Evans Suter, Mitema Alfred, Hilary Rutto, Wesley Omwoyo

{"title":"In situ capping of silver nanoparticles with cellulosic matrices from wheat straws in enhancing their antimicrobial activity: Synthesis and characterization.","authors":"Shappo Tlou, Evans Suter, Mitema Alfred, Hilary Rutto, Wesley Omwoyo","doi":"10.1080/10934529.2023.2260295","DOIUrl":"10.1080/10934529.2023.2260295","url":null,"abstract":"Silver nanoparticles have gained worldwide attention in the scientific community due to their high antimicrobial activity. However, they tend to agglomerate and lose their shape and properties, thus capping agents necessary to protect their shapes, sizes, and properties. To enhance their antimicrobial activity, this research aimed to cap silver nanoparticles with cellulosic matrices from wheat straws. The wheat straw was delignified with 6% HNO3, and the residual was treated with 1% NaOH and NaClO: CH3COOH (1:1), then used to synthesize cellulose nanocrystals via acid hydrolysis. AgNPs were incorporated into the CPC and CNCs by in-situ synthesis using NaHB4 as the reducing agent. Fourier Transform Infrared, Scanning Electron Microscopy, and X-ray diffraction were used to investigate their features. The findings exhibited crystallinity increased with subsequent treatments, according to XRD analysis. Ultraviolet-visible, FTIR, TEM, and XRD analysis confirmed the capping of AgNPs onto the cellulosic materials. Antibacterial activity against Staphylococcus aureus and Escherichia coli, with CNCs-AgNPs composite, exhibited higher activity compared to CPC-AgNPs composite due to the increased surface area and excellent binding on the surface of the composite.","PeriodicalId":15671,"journal":{"name":"Journal of Environmental Science and Health Part A-toxic\\/hazardous Substances & Environmental Engineering","volume":" ","pages":"903-913"},"PeriodicalIF":2.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41130923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0