Investigating extracellular polymeric substances from microbial mat upon exposure to sunlight | |
Shammi, Mashura; Pan, Xiangliang; Mostofa, Khan M. G.; Zhang, Daoyong; Liu, Cong-Qiang); Song, Wenjuan | |
刊名 | Polymer Degradation and Stability
![]() |
2017 | |
卷号 | 146页码:192-200 |
关键词 | Microbial Mat Extracellular Polymeric Substance (Eps) Photodegradation Dissolved Organic Carbon (Doc) Excitation-emission Matrix (Eem) Spectroscopy Parallel Factor (Parafac) Modelling |
英文摘要 | Microbial mat extracellular polymeric substances (EPS) and their fate and transformation in natural waters are unidentified under diurnal condition. EPS from highly saline arid origins were characterised and exposed to natural sunlight conditions to identify its physico-chemical changes over 72 h. Fourier Transform Infrared Spectroscopy (FTIR) and potentiometric titration analyses confirmed the presence of −COOH and –OH functional groups in raw EPS. In addition, size exclusion chromatography (SEC) confirmed the presence of two proteins-sized molecules in the original EPS which were found to degrade upon sunlight exposure. The excitation-emission matrix (EEM) and parallel factor (EEM-PARAFAC) identified two fluorescent components: A combined humic-like and protein-like component, and an individual tyrosine-like component. FTIR in irradiated samples confirmed degradation of EPS by showing presence of the −CH3 group at 1377 cm−1. Two proteins-sized molecules identified in SEC were degraded, thereby causing to significant changes in the pH and redox potential (Eh). Correspondingly, three fluorescent components were identified in irradiated samples using EEM-PARAFAC modelling and found to change in their fluorescence intensities upon sunlight exposure. It is therefore suggested that photochemical processes are important for sequential transformation of EPS into various organic substances in surface waters. |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.gyig.ac.cn/handle/42920512-1/8371] ![]() |
专题 | 地球化学研究所_环境地球化学国家重点实验室 |
作者单位 | 1.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Guizhou, Peoples R China 2.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Dept Environm Pollut & Proc Control, Lab Bioremediat, Urumqi 830011, Xinjiang, Peoples R China 3.Jahangirnagar Univ, Dept Environm Sci, Dhaka 1342, Bangladesh 4.Tianjin Univ, Inst Surface Earth Syst Sci, 92 Weijin Rd, Tianjin 300072, Peoples R China 5.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Guizhou, Peoples R China 6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Shammi, Mashura;Pan, Xiangliang;Mostofa, Khan M. G.;Zhang, Daoyong;Liu, Cong-Qiang);Song, Wenjuan. Investigating extracellular polymeric substances from microbial mat upon exposure to sunlight[J]. Polymer Degradation and Stability,2017,146:192-200. |
APA | Shammi, Mashura;Pan, Xiangliang;Mostofa, Khan M. G.;Zhang, Daoyong;Liu, Cong-Qiang);Song, Wenjuan.(2017).Investigating extracellular polymeric substances from microbial mat upon exposure to sunlight.Polymer Degradation and Stability,146,192-200. |
MLA | Shammi, Mashura;Pan, Xiangliang;Mostofa, Khan M. G.;Zhang, Daoyong;Liu, Cong-Qiang);Song, Wenjuan."Investigating extracellular polymeric substances from microbial mat upon exposure to sunlight".Polymer Degradation and Stability 146(2017):192-200. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论