槲皮素作为荧光探针对氟离子的识别作用  

A Quercetin-Based Fluorescent Probe for the Recognition of Fluorid Ions

作　　者：杨世龙[1,2] 姜维娜[1,2] 印彬 徐莉[2,3,4] 赵俸艺 高步红[4] 孙海军[4] 杜丽婷[4] 唐颖[4,5] 曹福亮[2,5] YANG Shi-long JIANG Wei-na YIN Bin XU Li ZHAO Feng-yi GAO Bu-hong SUN Hai-jun DU Li-ting TANG Ying CAO Fu-liang(College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China College of Science, Nanjing Forestry University, Nanjing 210037, China Advanced Analysis and Testing Center, Nanjing Forestry University, Nanjing 210037, China College of Forestry, Nanjing Forestry University, Nanjing 210037, China)

机构地区：[1]南京林业大学化学工程学院,江苏南京210037 [2]南京林业大学南方现代林业协同创新中心,江苏南京210037 [3]南京林业大学理学院,江苏南京210037 [4]南京林业大学现代分析测试中心,江苏南京210037 [5]南京林业大学林学院,江苏南京210037

出　　处：《光谱学与光谱分析》2016年第11期3582-3587,共6页Spectroscopy and Spectral Analysis

基　　金：国家林业局林业公益性行业科研专项项目(20120460102);江苏省第四期"333高层次人才培养工程"科研项目(BRA2012171);国家科技支撑计划课题项目(2012BAD21B04);南京林业大学优秀博士学位论文创新基金项目资助

摘　　要：槲皮素为天然黄酮类化合物,广泛存在于植物的根、茎、叶、花和果实中。槲皮素作为荧光探针检测氟离子不仅具有较好的选择性和灵敏度,而且与合成的荧光探针比,还具有来源广、环保、无毒等优点。实验将不同阴离子(F^-,Cl^-,Br^-,I^-,ClO_4^-,H_2PO_4^-)分别加入到槲皮素的二甲基亚砜(DMSO)溶液中,考查槲皮素溶液的荧光强度变化。实验发现当加入氟离子后,槲皮素在500nm处的荧光发射峰的强度降低,发生荧光猝灭,且其猝灭程度随着氟离子浓度的增大而改变,即荧光强度随着氟离子浓度的增大而减小,并呈线性变化。而其他阴离子的加入对槲皮素和槲皮素-氟离子体系的荧光发射强度影响不大,说明其他阴离子不影响槲皮素对氟离子的识别,显示了槲皮素对氟离子具有较好的选择性。由荧光滴定光谱和荧光滴定曲线得到槲皮素对氟离子的滴定方程为:y=-13.36x+173.4,线性关系为R2=0.991,线性范围为1.0×10^(-6)~8.0×10^(-6)mol·L^(-1),最低检测限为1.0×10-7 mol·L^(-1),表明槲皮素对氟离子的识别具有较高的灵敏度。进一步实验表明槲皮素识别氟离子的机理可能是氟离子的加入破坏了溶液体系的氢键,改变了槲皮素分子的共轭状态,发生分子内电荷转移,促使槲皮素荧光猝灭。用该法成功检测了样品中微量氟离子,回收率为100.67%~102.44%,精确度较好,测定结果稳定。Quercetin（Q）is one of the most common flavonoids present in roots,stems,leaves,flowers and fruits of most plants.In this study,aquercetin-based fluorescent probe for detecting fluorid ions had been proposed.With good selectivity and sensitivity for fluorid ions,Q-based fluorescent probe was easier to prepare,more eco-friendly and more innoxious compared with traditional fluorescent probe obtained by organic chemistry synthesis operation.There was a major fluorescence emission peak at 500 nm for Q in dimethyl sulfoxide（DMSO）when the excitation wavelength was 390 nm.The changes of fluorescence spectra were investigated before and after adding different anions into Q solution.The fluorescence emission intensity of Q even had no change when adding Cl^-,Br^-,I^-,ClO_4^-,H_2PO_4^-,respectively.While adding fluorid ions,the fluorescence emission intensity of Q was decreased obviously,which suggested fluorid ions could induce fluorescence quenching of Q in DMSO.And the fluorescence emission intensity of Q-F-system had almost no significant change when adding other anions（Cl^-,Br^-,I^-,ClO_4^-,H_2PO_4^-）,which meant the progress for detecting fluorid ions didn＇t be affected by other anions,and Q showed a good selectivity for fluorid ions.The fluorescence titration spectra showed that the fluorescence emission intensity of Q was decreased with the increase of concentration of fluorid ions,and they were in concentration-dependent manner.The fluorescence titration curve exhibited that the Q as fluorescent probe can be applied to the quantification of fluorid ions with a good linearity（R2=0.991）,linear range of 1.0~8.0×10^（-6）mol·L^（-1） and the detection limit of 1.0×10^（-7）mol·L^（-1）.Not only the changes appeared in fluorescence spectra,but also the changes appeared in UV-visible spectra,compared with Q absorption spectrum,the location of band at 375 nm had no change after adding Cl^-,Br^-,I^-,ClO_4^-,H_2PO_4^-,respectively.However,when adding flu-orid ions,the band at 375 nm was shifted

关 键 词：槲皮素 荧光探针 氟离子 阴离子 天然产物 

分 类 号：O657.3[理学—分析化学]