Highly sensitive and selective room-temperature phosphorescence determination of thiabendazole by the supramolecular interaction of thiabendazole/beta-cyclodextrin/triton X-100.
A strong and stable room temperature phosphorescence (RTP) signal (lambda(ex)/lambda(em) = 298/481 nm) resulting from a 1:1:1 beta-cyclodextrin (beta-CD)/thiabendazole (TBZ)/triton X-100 (TX-100) supramolecular ternary inclusion complex was induced by KI as a heavy atom perturber. Based on the heavy-atom induced RTP, a new phosphorescence method for TBZ determination was established. The analytical curve of TBZ gave a linear range of 20-820 ng mL(-1) with a detection limit and relative standard deviation of 2.1 ng mL(-1) and 1.9%, respectively. The interference of 46 coexisting substances was studied. Compared with the method using a chemical oxygen scavenger, this method is simpler as deoxygenation of the solution is not required. The detection limit and the heavy-atom concentration of the proposed method were decreased about 8 and 4 times, respectively. The lifetime of the phosphorescence was prolonged 9 times and the pH range was greatly broadened. The proposed method has been successfully applied to the determination of TBZ in tap water, lake water and pineapples.
Tang
Bo
B
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, China. tangb@sdnu.edu.cn
Wang
Xu
X
Wang
Guangli
G
Wang
Yan
Y
Chen
Zhenzhen
Z
D000890:Anti-Infective Agents / Q000032:analysis*; D005506:Food Contamination / Q000032:analysis; D008163:Luminescent Measurements / Q000379:methods; D017830:Octoxynol / Q000737:chemistry; D013696:Temperature; D013827:Thiabendazole / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis; D047392:beta-Cyclodextrins / Q000737:chemistry
D000890:Anti-Infective Agents; D014874:Water Pollutants, Chemical; D047392:beta-Cyclodextrins; D017830:Octoxynol; C031215:betadex; D013827:Thiabendazole