کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4979272 1453022 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Siderophore-mediated iron removal from chrysotile: Implications for asbestos toxicity reduction and bioremediation
ترجمه فارسی عنوان
حذف آهن از طریق سیدورفور از کریستوتیل: پیامدهای کاهش سم زدایی و بهبود زیستی
کلمات کلیدی
کریزوتیل، درمان زیستی، براونفیلد، سمیت آزبست، حذف آهن،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
چکیده انگلیسی


- Fungal and bacterial siderophore removed iron from chrysotile fibers.
- Organic-acid exudates were ineffective in removing iron.
- Siderophore could remove exchangeable and structural iron.
- Siderophore-mediated iron removal lowered fiber toxicity.
- Results suggest that bioremediation of asbestos fibers is feasible.

Asbestos fibers are highly toxic (Group 1 carcinogen) due to their high aspect ratio, durability, and the presence of iron. In nature, plants, fungi, and microorganisms release exudates, which can alter the physical and chemical properties of soil minerals including asbestos minerals. We examined whether exudates from bacteria and fungi at environmentally relevant concentrations can alter chrysotile, the most widely used asbestos mineral, and lower its toxicity. We monitored the release of iron from chrysotile in the presence of organic acid ligands and iron-specific siderophores derived from bacteria and fungi and measured any change in fiber toxicity toward peritoneal macrophages harvested from mice. Both fungal and bacterial siderophores increased the removal of iron from asbestos fibers. In contrast, organic acid ligands at environmentally relevant concentrations neither released iron from fibers nor helped in siderophore-mediated iron removal. Removal of plant-available or exchangeable iron did not diminish iron dissolution by both types of siderophores, which indicates that siderophores can effectively remove structural iron from chrysotile fibers. Removal of iron by siderophore lowered the fiber toxicity; fungal siderophore appears to be more effective than bacterial siderophore in lowering the toxicity. These results indicate that prolonged exposure to siderophores, not organic acids, in the soil environment decreases asbestos fiber toxicity and possibly lowers the health risks. Thus, bioremediation should be explored as a viable strategy to manage asbestos-contaminated sites such as Brownfield sites, which are currently left untreated despite dangers to surrounding communities.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 341, 5 January 2018, Pages 290-296
نویسندگان
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