title: [Fluorimetric study of Tb-EDTA-quercetin and determination of quercetin].
abstract: Tb-EDTA-Quercetin complexes were formed under basic conditions. Intramolecular energy transfer occurs in the Tb-EDTA complex with quercetin (QCT) and the terbium (III) ion fluorescence can be sensitized by QCT. Accordingly a fluorimetric method was used for the determination of QCT in urine, serum and mixed substance of rutin-quercetin. The method is simple, sensitive and fast. The linear range is 5.0 x (-7)-1.0 x10(-5) mol x L(-1) and the detection limit is 5.0 x 10(-8) mol x L(-1). This method can be applied to the determination of QCT in non-pretreated urine and serum successfully. The recoveries are in the range of 103%-96%.
authors.affiliation: Department of Chemistry, Beijing Normal University, 100875 Beijing.
authors.forename: C
authors.initials: C
authors.lastname: Liu
authors.forename: H
authors.initials: H
authors.lastname: Zhao
authors.forename: L
authors.initials: L
authors.lastname: Jin
mesh_terms: D004492:Edetic Acid / Q000032:analysis*; D005470:Fluorometry / Q000379:methods*; D006801:Humans; D057230:Limit of Detection; D011794:Quercetin / Q000097:blood* / Q000652:urine*; D013725:Terbium / Q000032:analysis*
chemical_list: D013725:Terbium; D004492:Edetic Acid; D011794:Quercetin