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OALib Journal期刊
ISSN: 2333-9721
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基于聚合物核壳纳米粒子的Hg2+比率型荧光检测传感器
DOI: 10.3724/SP.J.1105.2012.11349, PP. 666-672
Keywords: 荧光共振能量转移,比率检测,汞离子荧光探针,聚合物纳米粒子,罗丹明
Abstract:
采用一步聚合的方法,制备了以疏水的聚甲基丙烯酸甲酯(PMMA)为核、亲水性的聚电解质支化聚乙烯亚胺(PEI)为壳的纳米粒子分散液.将供体荧光团4-胺基-7-硝基-N-辛基苯并［1,2,5］噁二唑(NBD)以包埋的方式在聚合过程中直接引入PMMA核内部,而受体荧光团罗丹明衍生物SRHB通过吸附作用进入PEI-PMMA核壳界面,构成了含有两种不同荧光分子且可对Hg2+进行荧光比率检测的传感器.考察了含荧光分子的聚合物粒子光谱学性质,证明两种荧光分子均被引入了聚合物粒子体系.在汞离子的荧光检测试验中,加入Hg2+后,体系中的NBD荧光强度下降,而罗丹明的特征发射峰在579nm处出现,并随着Hg2+浓度的增加,受体/供体的荧光强度比值呈现增长趋势.研究还发现,聚合物粒子基荧光探针对于Hg2+具有较好的选择性,且最佳使用范围是体系pH值在5~8之间,其检测Hg2+的最低浓度可达到1μmol/L.
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