文献类型：期刊文献

英文题名：Characteristic study of Pb2+ binding to extracellular polymeric substances from Staphylococcus epidermidis G257

作者：Chen, Yinyan[1]; Fang, Zhijia[1]; Li, Yongbin[1]; Deng, Qi[1]; Sun, Lijun[1]; Liao, Jianmeng[2]; Gooneratne, Ravi[3]

机构：[1] College of Food Science and Technology, Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Provincial Engineering Technology, Research Center of Marine Food, Key Laboratory of Advanced Processing of Aquatic Products of Guangdong Higher Education Institution, Guangdong Ocean University, Zhanjiang, 524088, China; [2] Zhanjiang Institute for Food and Drug Control, Zhanjiang, 524022, China; [3] Department of Wine, Food and Molecular Biosciences, Lincoln University, Lincoln, Canterbury, 7647, New Zealand

年份：2025

卷号：198

外文期刊名：International Biodeterioration and Biodegradation

收录：EI(收录号：20250317695476)、Scopus(收录号：2-s2.0-85214862565)

语种：英文

外文关键词：Electron spin resonance spectroscopy

外文摘要：As an important toxic pollutant, lead (Pb2+) seriously threatens the environment and human well-being. Microbes and microbial extracellular polymeric substances (EPS) are highly effective at removing heavy metals from solutions. Herein, a Pb2+-tolerant strain, Staphylococcus epidermidis G257 was isolated from Guangxi of China. The strain showed strong resistance to Pb2+ and great Pb2+ adsorbability. The biosorption processes of S. epidermidis G257 and its EPS were characterized using microscopical techniques, ICP-MS, zeta potential measurement, XRD, FTIR, 3D-EEM, and XPS spectroscopy. Results showed that S. epidermidis G257 were effective in adsorbing Pb2+, with a biosorption efficiency of 81%. The biosorption process of Pb2+ was described well by the pseudo-second-order model with an adsorption capacity of 53.52 mg/g. Microscopical analyses showed that Pb2+ was adsorbed on the S. epidermidis surface by forming EPS precipitates. The variations in zeta potential indicated an electrostatic attraction in the Pb2+ adsorption process. Moreover, FTIR, 3D-EEM and XPS analyses revealed that the functional groups participating in Pb2+ adsorption were primarily carbonyl, carboxyl and amino groups of proteins in the EPS, which greatly facilitated Pb2+ adsorption by forming EPS-metal complexes. Therefore, this study unveiled that S. epidermidis G257 can be utilized as a potential biosorbent for eliminating Pb2+ from polluted environment. ? 2025 Elsevier Ltd