title: [The interaction of beta-cyclodextrin with etoposide studied by fluorescence spectroscopy].
abstract: The fluorescence spectroscopy and UV spectroscopy have been used to monitor the inclusion phenomena of VP-16 with beta-cyclodextrin (beta-CD), together with studies concerning the effects of reaction time, temperature and concentration on this behavior. The results show that the fluorescence intensity increased when VP-16 and beta-CD forming a 1 : 1 inclusion complex, which indicate that beta-CD has fluorescence sensitizing effect on the VP-16. At 22 degrees C, the inclusion constant was 2.63 x 10(5) L x mol(-1) at pH 7.0. VP-16 has maximum emission wavelength at 316 nm under the optimum conditions. According to this, the quantitative micro-detection method of VP-16 by fluorescence spectrometry was established. The linear regression equation was y = 1.107 89 x 10(70 x + 95.898 1, with a correlation coefficient of 0.999 9. The detection limit was 2.094 x 10(-7) mol x L(-1).
authors.affiliation: School of Chemistry and Chemical Engineering, Nantong University, Nantong 226007, China.
authors.forename: Yue-Hua
authors.initials: YH
authors.lastname: Zhang
authors.forename: Nan-Ping
authors.initials: NP
authors.lastname: Wang
authors.forename: Qi-Ping
authors.initials: QP
authors.lastname: Zhang
authors.forename: Xiao-Qiu
authors.initials: XQ
authors.lastname: Shi
mesh_terms: D004347:Drug Interactions; D005047:Etoposide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D016014:Linear Models; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D047392:beta-Cyclodextrins; D005047:Etoposide; C031215:betadex