title: CdSe/ZnS quantum dots based fluorescence quenching method for determination of paeonol.
abstract: Aqueous polymethylmethacrylate (PMMA)-capped CdSe/ZnS quantum dots were used as fluorescence probes for paeonol determination. Based on the fluorescence quenching of aqueous CdSe/ZnS quantum dots caused by paeonol, a simple, sensitive and rapid method was developed. Under the optimal conditions, with excitation and emission wavelengths at 350 nm and 620 nm, respectively, the calibration plot of F0-F with concentration of paeonol was linear in the range of 25.04-175.2 mg L(-1) with correlation coefficient of 0.9986. The limit of detection was 0.017 mg L(-1). The concentration of paeonol in paeonol ointment was determined by the proposed method and the result agreed with the claimed value. Furthermore, the possible fluorescence quenching mechanism was discussed.
authors.affiliation: Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Dong
authors.forename: Huai-Bin
authors.initials: HB
authors.lastname: Shen
authors.forename: Xiu-Hua
authors.initials: XH
authors.lastname: Liu
authors.forename: Ming-Jing
authors.initials: MJ
authors.lastname: Li
authors.forename: Lin-Song
authors.initials: LS
authors.lastname: Li
mesh_terms: D000042:Absorption; D000098:Acetophenones / Q000032:analysis*; D002021:Buffers; D019187:Cadmium Compounds / Q000737:chemistry*; D002138:Calibration; D000431:Ethanol / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D057927:Hydrophobic and Hydrophilic Interactions; D057230:Limit of Detection; D046529:Microscopy, Electron, Transmission; D045663:Quantum Dots; D012015:Reference Standards; D018036:Selenium Compounds / Q000737:chemistry*; D012996:Solutions; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013440:Sulfides / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D000098:Acetophenones; D002021:Buffers; D019187:Cadmium Compounds; D018036:Selenium Compounds; D012996:Solutions; D013440:Sulfides; D017967:Zinc Compounds; D014867:Water; D000431:Ethanol; C013638:paeonol; C058667:cadmium selenide; C031238:zinc sulfide