Perfluorooctane sulfonate(PFOS)is a dominant per-and polyfluoroalkyl substance(PFAS)at aqueous film-forming foam-impacted sites,yet its specific inhibitory effect on reductive dechlorination of trichloroethene(TCE)rem...Perfluorooctane sulfonate(PFOS)is a dominant per-and polyfluoroalkyl substance(PFAS)at aqueous film-forming foam-impacted sites,yet its specific inhibitory effect on reductive dechlorination of trichloroethene(TCE)remains poorly understood.We investigated TCE dechlorination in a Dehalococcoides(Dhc)and Dehalogenimonas(Dhg)-containing consortium under PFOS stress(20-100 mg/L).While the initial TCE dechlorination rates decreased with increasing PFOS concentrations,the final step of vinyl chloride dechlorination to ethene remained largely unaffected.Microbial community analysis revealed that Dhc and Acetobacterium exhibited greater resilience to 100 mg/L PFOS than Dhg and Clostridium_sensu_stricto_7,with alpha diversity significantly reduced at 100 mg/L PFOS.PFOS,but not perfluorooctanoic acid,was identified as the primary inhibitor of TCE dechlorination.Metagenomic sequencing identified two PFOS-tolerant Dhc strains(THU3 and THU4)that harbored specific reductive dehalogenase genes(vcrA and tceA).Our findings demonstrate the functional resilience of Dhc and its potential as a key agent for bioremediation at PFAS-co-contaminated sites.展开更多
The novel perfluorooctane sulfonate(PFOS)alternative,6:2 chlorinated polyfluorinated ether sulfonate(F-53B)was found in various environments showing even higher levels than PFOS.However,its neurotoxicity and the possi...The novel perfluorooctane sulfonate(PFOS)alternative,6:2 chlorinated polyfluorinated ether sulfonate(F-53B)was found in various environments showing even higher levels than PFOS.However,its neurotoxicity and the possible molecular mechanisms remain largely unknown.Acetylcholinesterase(AChE)is a critical enzyme that hydrolyzes the neurotransmitter acetylcholine(ACh)and regulates nerve conduction.With zebrafish as the model animal and AChE as the target,this study comparatively investigated the in vitro and in vivo neurotoxicity of PFOS and F-53B,uncovering possible induced mechanisms.Our results indicated PFOS and F-53B could increase AChE activity to induce neurotoxicity in zebrafish brain,whereas the induced effect of F-53B lasted longer than PFOS.We found that oxidative stress was one of the mechanisms underlying PFOS and F-53B neurotoxicity.PFOS and F-53B loosened the AChE protein skeleton,thereby changing the AChE secondary structure.F-53B exhibited greater effects on the secondary structure content than PFOS.PFOS and F-53B showed approximately one binding site on AChE,spontaneously binding to various AChE amino acid residues through different forces.In contrast,the hydrogen bond distance formed by PFOS was longer,resulting in a weaker binding force to AChE than F-53B The study expands our comprehension of the molecular mechanisms underlying PFOS and F-53B neurotoxicity and offers novel insights into the safety of PFOS substitutes.展开更多
Research on the occurrence of perfluorochemicals (PFCs) such as perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) in the agricultural environment is lacking, in spite of their potential risk ...Research on the occurrence of perfluorochemicals (PFCs) such as perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) in the agricultural environment is lacking, in spite of their potential risk via food chain transfer from aquatic and soil-plant systems to animals and/or humans. In the present study, for the first time, soil and water samples collected from 243 different agricultural sites adjacent to waste water treatment plants (WWTPs) belonging to 81 cities and 5 provinces with different levels of industrialization in South Korea were monitored for concentrations of PFOS and PFOA by use of solid phase extraction and liquid chromatography-tandem mass spectroscopy (LC-MS/MS). Significant mean concentrations of PFOA (0.001-0.007 tJg L-1 water and 〈0.05-1.573 tJg kg-1 soil) and PFOS (0.001-0.22 tJg L-1 water and 〈0.05-0.741 pg kg-1 soil) were found in all samples. Concentrations of PFCs in soils were high, highlighting that soil is an important sink for PFCs in the agricultural environment. Samples from near WWTPs in Gyeongsang Province contained the highest concentrations of PFOS and PFOA, reflecting the concentration of heavy industry in the province. The concentrations of PFCs in agricultural water (most samples 〈0.05 pg L-~) and soils (most samples 〈1 IJg kg-~) from South Korea were less than acceptable guideline values, indicating that South Korea is not a hotspot of PFOS and PFOA contamination and that there is negligible risk to human and ecological health from these chemicals. However, further studies investigating the seasonal variation in PFOA, PFOS and other perfluorochemical concentrations in the agricultural environment are needed.展开更多
基金supported by the National Key R&D Program of China(No.2024YFC3713800)the National Natural Science Foundation of China(No.42107058)+1 种基金the Fundamental and Interdisciplinary Disciplines Breakthrough Plan of the Ministry of Education of China(No.JYB2025XDXM909)the Open Project Program of Key Laboratory of Soil Environmental Management and Pollution Control,China(No.MEESEPC202301).
摘要Perfluorooctane sulfonate(PFOS)is a dominant per-and polyfluoroalkyl substance(PFAS)at aqueous film-forming foam-impacted sites,yet its specific inhibitory effect on reductive dechlorination of trichloroethene(TCE)remains poorly understood.We investigated TCE dechlorination in a Dehalococcoides(Dhc)and Dehalogenimonas(Dhg)-containing consortium under PFOS stress(20-100 mg/L).While the initial TCE dechlorination rates decreased with increasing PFOS concentrations,the final step of vinyl chloride dechlorination to ethene remained largely unaffected.Microbial community analysis revealed that Dhc and Acetobacterium exhibited greater resilience to 100 mg/L PFOS than Dhg and Clostridium_sensu_stricto_7,with alpha diversity significantly reduced at 100 mg/L PFOS.PFOS,but not perfluorooctanoic acid,was identified as the primary inhibitor of TCE dechlorination.Metagenomic sequencing identified two PFOS-tolerant Dhc strains(THU3 and THU4)that harbored specific reductive dehalogenase genes(vcrA and tceA).Our findings demonstrate the functional resilience of Dhc and its potential as a key agent for bioremediation at PFAS-co-contaminated sites.
基金supported by the Natural Science Foundation of Shandong Province(No.ZR2022MB081)the Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province(No 20220206)the National Natural Science Foundation of China(No.21707026).
摘要The novel perfluorooctane sulfonate(PFOS)alternative,6:2 chlorinated polyfluorinated ether sulfonate(F-53B)was found in various environments showing even higher levels than PFOS.However,its neurotoxicity and the possible molecular mechanisms remain largely unknown.Acetylcholinesterase(AChE)is a critical enzyme that hydrolyzes the neurotransmitter acetylcholine(ACh)and regulates nerve conduction.With zebrafish as the model animal and AChE as the target,this study comparatively investigated the in vitro and in vivo neurotoxicity of PFOS and F-53B,uncovering possible induced mechanisms.Our results indicated PFOS and F-53B could increase AChE activity to induce neurotoxicity in zebrafish brain,whereas the induced effect of F-53B lasted longer than PFOS.We found that oxidative stress was one of the mechanisms underlying PFOS and F-53B neurotoxicity.PFOS and F-53B loosened the AChE protein skeleton,thereby changing the AChE secondary structure.F-53B exhibited greater effects on the secondary structure content than PFOS.PFOS and F-53B showed approximately one binding site on AChE,spontaneously binding to various AChE amino acid residues through different forces.In contrast,the hydrogen bond distance formed by PFOS was longer,resulting in a weaker binding force to AChE than F-53B The study expands our comprehension of the molecular mechanisms underlying PFOS and F-53B neurotoxicity and offers novel insights into the safety of PFOS substitutes.
基金the support of the Research Program for Agricultural Science & Technology Development (PJ010896)the National Academy of Agricultural Science, Rural Development Administration, Republic of Korea
摘要Research on the occurrence of perfluorochemicals (PFCs) such as perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) in the agricultural environment is lacking, in spite of their potential risk via food chain transfer from aquatic and soil-plant systems to animals and/or humans. In the present study, for the first time, soil and water samples collected from 243 different agricultural sites adjacent to waste water treatment plants (WWTPs) belonging to 81 cities and 5 provinces with different levels of industrialization in South Korea were monitored for concentrations of PFOS and PFOA by use of solid phase extraction and liquid chromatography-tandem mass spectroscopy (LC-MS/MS). Significant mean concentrations of PFOA (0.001-0.007 tJg L-1 water and 〈0.05-1.573 tJg kg-1 soil) and PFOS (0.001-0.22 tJg L-1 water and 〈0.05-0.741 pg kg-1 soil) were found in all samples. Concentrations of PFCs in soils were high, highlighting that soil is an important sink for PFCs in the agricultural environment. Samples from near WWTPs in Gyeongsang Province contained the highest concentrations of PFOS and PFOA, reflecting the concentration of heavy industry in the province. The concentrations of PFCs in agricultural water (most samples 〈0.05 pg L-~) and soils (most samples 〈1 IJg kg-~) from South Korea were less than acceptable guideline values, indicating that South Korea is not a hotspot of PFOS and PFOA contamination and that there is negligible risk to human and ecological health from these chemicals. However, further studies investigating the seasonal variation in PFOA, PFOS and other perfluorochemical concentrations in the agricultural environment are needed.