Microbial Removal of Heavy Metals from Contaminated Environments Using Metal-Resistant Indigenous Strains

IF 6.8 Q1 TOXICOLOGY

Journal of Xenobiotics Pub Date : 2023-12-29 DOI:10.3390/jox14010004

Cristina Firincă, Lucian-Gabriel Zamfir, Mariana Constantin, I. Răut, Luiza Capră, Diana Popa, M. Jinga, Anda Maria Baroi, R. Fierăscu, Nicoleta Olguța Corneli, Carmen Postolache, M. Doni, A. Gurban, L. Jecu, T. Șesan

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引用次数: 0

Abstract

Contamination of soil with heavy metals has become a matter of global importance due to its impact on agriculture, environmental integrity, and therefore human health and safety. Several microbial strains isolated from soil contaminated by long-term chemical and petrochemical activities were found to manifest various levels of tolerance to Cr, Pb, and Zn, out of which Bacillus marisflavi and Trichoderma longibrachiatum exhibited above-moderate tolerance. The concentrations of target heavy metals before and after bioremediation were determined using electrochemical screen-printed electrodes (SPE) modified with different nanomaterials. The morpho-structural SEM/EDX analyses confirmed the presence of metal ions on the surface of the cell, with metal uptake being mediated by biosorption with hydroxyl, carboxyl, and amino groups as per FTIR observations. T. longibrachiatum was observed to pose a higher bioremediation potential compared to B. marisflavi, removing 87% of Cr and 67% of Zn, respectively. Conversely, B. marisflavi removed 86% of Pb from the solution, compared to 48% by T. longibrachiatum. Therefore, the fungal strain T. longibrachiatum could represent a viable option for Cr and Zn bioremediation strategies, whereas the bacterial strain B. marisflavi may be used in Pb bioremediation applications.

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利用微生物从受污染环境中去除重金属的抗金属本地菌株

由于重金属对农业、环境完整性以及人类健康和安全的影响，土壤重金属污染已成为一个全球性的重要问题。研究发现，从长期化学和石油化工活动污染的土壤中分离出的几种微生物菌株对铬、铅和锌表现出不同程度的耐受性，其中枯草芽孢杆菌（Bacillus marisflavi）和长苞毛霉（Trichoderma longibrachiatum）表现出中等以上的耐受性。使用不同纳米材料修饰的电化学丝网印刷电极（SPE）测定了生物修复前后目标重金属的浓度。形态结构 SEM/EDX 分析证实细胞表面存在金属离子，根据傅立叶变换红外光谱（FTIR）观察，金属吸收是由羟基、羧基和氨基的生物吸附作用介导的。与 B. marisflavi 相比，T. longibrachiatum 具有更高的生物修复潜力，可分别去除 87% 的铬和 67% 的锌。相反，B. marisflavi 从溶液中去除 86% 的铅，而 T. longibrachiatum 只去除 48%。因此，真菌菌株 T. longibrachiatum 可作为铬和锌生物修复战略的可行选择，而细菌菌株 B. marisflavi 则可用于铅生物修复应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Xenobiotics TOXICOLOGY-

CiteScore

5.30

自引率

1.70%

发文量

审稿时长

10 weeks

期刊介绍： The Journal of Xenobiotics publishes original studies concerning the beneficial (pharmacology) and detrimental effects (toxicology) of xenobiotics in all organisms. A xenobiotic (“stranger to life”) is defined as a chemical that is not usually found at significant concentrations or expected to reside for long periods in organisms. In addition to man-made chemicals, natural products could also be of interest if they have potent biological properties, special medicinal properties or that a given organism is at risk of exposure in the environment. Topics dealing with abiotic- and biotic-based transformations in various media (xenobiochemistry) and environmental toxicology are also of interest. Areas of interests include the identification of key physical and chemical properties of molecules that predict biological effects and persistence in the environment; the molecular mode of action of xenobiotics; biochemical and physiological interactions leading to change in organism health; pathophysiological interactions of natural and synthetic chemicals; development of biochemical indicators including new “-omics” approaches to identify biomarkers of exposure or effects for xenobiotics.