{"title":"利用粪肠球菌 DU.FS 衍生的外多糖生物合成抗菌和抗氧化银纳米粒子:绿色纳米技术的可持续方法","authors":"Parvin Chegini, Fatemeh Salimi, Ehsan Nazarzadeh Zare, Parisa Farrokh","doi":"10.1007/s10924-024-03361-y","DOIUrl":null,"url":null,"abstract":"<div><p>Green synthesis of nanoparticles is an effective, cost-effective, and environmentally friendly approach to produce biocompatible nanoparticles with broad-spectrum bioactivities. In the current study, lactic acid bacterium-derived exopolysaccharide (EPS) was explored to biologically synthesize green silver nanoparticles (EPS-AgNPs). The antibacterial and antioxidant activities of EPS-AgNPs were investigated by agar well diffusion and DPPH tests, respectively. Subsequently, EPS-AgNPs and chemical AgNPs were characterized, and their physicochemical properties were compared. According to 16 S rRNA gene sequencing, the EPS-producing lactic acid bacterium showed 97.77% similarity to <i>Enterococcus faecium</i>. EPS-AgNPs exhibited inhibitory effects on Gram-positive and Gram-negative bacterial pathogens. Additionally, EPS-AgNPs showed considerable ability (84%) to quench DPPH free radicals. Fourier-transform infrared spectroscopy (FT-IR) showed the involvement of EPS’s functional groups, including hydroxyl, carbonyl, and aldehyde groups, in synthesizing nanoparticles. Scanning electron microscopy revealed a quasi-spherical morphology for both the EPS-AgNPs and chemically synthesized AgNPs, while X-ray diffraction (XRD) analysis confirmed their crystalline nature. The high metal content of chemical Ag-NPs (89.79%) was in good agreement with its high thermal stability in TGA results. Additionally, lower thermal stability and less Ag content (65.93%) of EPS-AgNPs, along with their smooth surfaces, indicated the capping role of EPS. EPS-AgNPs showed Z-average size, PI value, and zeta potential of 158.31 nm, 0.29, and − 17.75 mV, respectively. Collectively, the present study revealed that <i>Enterococcus faecium</i>-derived EPS acted as reducing, capping, and stabilizing agents in green synthesizing EPS-AgNPs with potential applications in medical and food-packaging industries.</p></div>","PeriodicalId":659,"journal":{"name":"Journal of Polymers and the Environment","volume":null,"pages":null},"PeriodicalIF":4.7000,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Biogenic Synthesis of Antibacterial and Antioxidant Silver Nanoparticles Using Enterococcus faecium DU.FS-Derived Exopolysaccharides: A Sustainable Approach for Green Nanotechnology\",\"authors\":\"Parvin Chegini, Fatemeh Salimi, Ehsan Nazarzadeh Zare, Parisa Farrokh\",\"doi\":\"10.1007/s10924-024-03361-y\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Green synthesis of nanoparticles is an effective, cost-effective, and environmentally friendly approach to produce biocompatible nanoparticles with broad-spectrum bioactivities. In the current study, lactic acid bacterium-derived exopolysaccharide (EPS) was explored to biologically synthesize green silver nanoparticles (EPS-AgNPs). The antibacterial and antioxidant activities of EPS-AgNPs were investigated by agar well diffusion and DPPH tests, respectively. Subsequently, EPS-AgNPs and chemical AgNPs were characterized, and their physicochemical properties were compared. According to 16 S rRNA gene sequencing, the EPS-producing lactic acid bacterium showed 97.77% similarity to <i>Enterococcus faecium</i>. EPS-AgNPs exhibited inhibitory effects on Gram-positive and Gram-negative bacterial pathogens. Additionally, EPS-AgNPs showed considerable ability (84%) to quench DPPH free radicals. Fourier-transform infrared spectroscopy (FT-IR) showed the involvement of EPS’s functional groups, including hydroxyl, carbonyl, and aldehyde groups, in synthesizing nanoparticles. Scanning electron microscopy revealed a quasi-spherical morphology for both the EPS-AgNPs and chemically synthesized AgNPs, while X-ray diffraction (XRD) analysis confirmed their crystalline nature. The high metal content of chemical Ag-NPs (89.79%) was in good agreement with its high thermal stability in TGA results. Additionally, lower thermal stability and less Ag content (65.93%) of EPS-AgNPs, along with their smooth surfaces, indicated the capping role of EPS. EPS-AgNPs showed Z-average size, PI value, and zeta potential of 158.31 nm, 0.29, and − 17.75 mV, respectively. Collectively, the present study revealed that <i>Enterococcus faecium</i>-derived EPS acted as reducing, capping, and stabilizing agents in green synthesizing EPS-AgNPs with potential applications in medical and food-packaging industries.</p></div>\",\"PeriodicalId\":659,\"journal\":{\"name\":\"Journal of Polymers and the Environment\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.7000,\"publicationDate\":\"2024-07-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Polymers and the Environment\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10924-024-03361-y\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, ENVIRONMENTAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Polymers and the Environment","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10924-024-03361-y","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
Biogenic Synthesis of Antibacterial and Antioxidant Silver Nanoparticles Using Enterococcus faecium DU.FS-Derived Exopolysaccharides: A Sustainable Approach for Green Nanotechnology
Green synthesis of nanoparticles is an effective, cost-effective, and environmentally friendly approach to produce biocompatible nanoparticles with broad-spectrum bioactivities. In the current study, lactic acid bacterium-derived exopolysaccharide (EPS) was explored to biologically synthesize green silver nanoparticles (EPS-AgNPs). The antibacterial and antioxidant activities of EPS-AgNPs were investigated by agar well diffusion and DPPH tests, respectively. Subsequently, EPS-AgNPs and chemical AgNPs were characterized, and their physicochemical properties were compared. According to 16 S rRNA gene sequencing, the EPS-producing lactic acid bacterium showed 97.77% similarity to Enterococcus faecium. EPS-AgNPs exhibited inhibitory effects on Gram-positive and Gram-negative bacterial pathogens. Additionally, EPS-AgNPs showed considerable ability (84%) to quench DPPH free radicals. Fourier-transform infrared spectroscopy (FT-IR) showed the involvement of EPS’s functional groups, including hydroxyl, carbonyl, and aldehyde groups, in synthesizing nanoparticles. Scanning electron microscopy revealed a quasi-spherical morphology for both the EPS-AgNPs and chemically synthesized AgNPs, while X-ray diffraction (XRD) analysis confirmed their crystalline nature. The high metal content of chemical Ag-NPs (89.79%) was in good agreement with its high thermal stability in TGA results. Additionally, lower thermal stability and less Ag content (65.93%) of EPS-AgNPs, along with their smooth surfaces, indicated the capping role of EPS. EPS-AgNPs showed Z-average size, PI value, and zeta potential of 158.31 nm, 0.29, and − 17.75 mV, respectively. Collectively, the present study revealed that Enterococcus faecium-derived EPS acted as reducing, capping, and stabilizing agents in green synthesizing EPS-AgNPs with potential applications in medical and food-packaging industries.
期刊介绍:
The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.