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OALib Journal期刊
ISSN: 2333-9721
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藻菌生物膜胞外聚合物(eps)与al3+的配位作用机理
DOI: 10.3724/SP.J.1145.2009.00347, PP. 347-350
Keywords: 胞外聚合物,al3+,三维荧光光谱,荧光猝灭,傅立叶转换红外光谱,生物膜,条件稳定常数
Abstract:
摘要利用三维荧光光谱(3deem)和傅立叶转换红外光谱(ftir)研究了藻菌生物膜eps与al3+的相互作用机理.3deem结果表明，生物膜eps含有3个荧光峰.其中，峰a(ex/em=225~235nm/300~330nm)和峰b(ex/em=275~280nm/325~330nm)荧光较强，属类蛋白峰，峰c(ex/em=335nm/432~434nm)荧光较弱，属类腐殖酸峰.峰a和峰b都能不同程度地被al3+猝灭，它们的条件稳定常数(logk)分别为5.89和6.95.al3+-eps体系的峰a和峰b荧光强度明显受溶液ph值的影响.在ph为2~4之间时，荧光强度随ph的增大而增大，在4~7之间随ph的增大而减小，在7~11之间随ph增大而增大.ftir光谱图分析表明，al3+主要与eps中所含的―nh―、c==o等发生强的配位作用.图6参21
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