| 光谱学与光谱分析 |
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| The Interaction of Cucurbit[8]uril with Thionine and Carbendazim with Spectroscopic Method |
| XI Yun-yun1, 2, TANG Qing1, HUANG Ying1, 2*, TAO Zhu2, XUE Sai-feng2, ZHU Qian-jiang2 |
1. The Engineering and Research Center for Southwest Bio-Pharmaceutical Resources Ministry of Education of Guizhou University, Guiyang 550025, China
2. Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou University, Guiyang 550025, China |
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Abstract In this paper, the interaction of cucurbit [8]uril(Q[8]) with thionine (TH) and carbendazim (CBZ) were investigated with fluorescence and UV-Vis spectroscopy. The experimental results showed that the inclusion complex between Q[8] and TH informed was at molar ratios of 1∶2 in 0.01 mol·L-1 hydrochloric acid solution. The fluorescence intensity of the Q[8]/TH complexes quenched when Q[8] was added to TH solution, but fluorescence increasing of the Q[8]/TH complex with the addition of CBZ was observed. The fluorescence increasing values show a good linear relationship with the CBZ concentration within 0~3.5 μmol·L-1. The linear regression equation relating fluorescence intensity (If) to CBZ concentration (c) is If=0.45c+32.24 (r=0.999). The detection limit was 9.39×10-8 mol·L-1. Forthemore, the influence of foreign species on the analytical signal of the Q[8]/TH complex in the presence of carbendazim was established. No interference was observed from commonly used foreign species such as metal ions (Fe3+, Mg2+, Ca2+). In particular, benzimidazole compounds thiabendazole and fuberidazole do not interfere with CBZ determination at a specific concentration. The results revealed that complexation of Q[8] and TH with CBZ offers a fluorescent switching “on-off” effect which will supply a potential application in pesticide residues test.
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Received: 2015-05-27
Accepted: 2015-09-01
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Corresponding Authors:
HUANG Ying
E-mail: yinghung128@163.com
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