Synchronous fluorescence and UV-vis spectroscopic studies of interactions between the tetracycline antibiotic, aluminium ions and DNA with the aid of the Methylene Blue dye probe.
Synchronous fluorescence spectroscopy (SFS) was applied for the investigation of interactions of the antibiotic, tetracycline (TC), with DNA in the presence of aluminium ions Al3+. The study was facilitated by the use of the Methylene Blue (MB) dye probe, and the interpretation of the spectral data with the aid of the chemometrics method, parallel factor analysis (PARAFAC). Three-way synchronous fluorescence analysis extracted the important optimum constant wavelength differences, deltalambda, and showed that for the TC-Al3+-DNA, TC-Al3+ and MB dye systems, the associated deltalambda values were different (deltalambda=80, 75 and 30 nm, respectively). Subsequent PARAFAC analysis demonstrated the extraction of the equilibrium concentration profiles for the TC-Al3+, TC-Al3+-DNA and MB probe systems. This information is unobtainable by conventional means of data interpretation. The results indicated that the MB dye interacted with the TC-Al3+-DNA surface complex, presumably via a reaction intermediate, TC-Al3+-DNA-MB, leading to the displacement of the TC-Al3+ by the incoming MB dye probe.
Ni
Yongnian
Y
Department of Chemistry, Nanchang University, Nanchang, Jiangxi 330047, China. ynni@ncu.edu.cn
Lin
Daiqin
D
Kokot
Serge
S
D000535:Aluminum / Q000032:analysis / Q000737:chemistry*; D000818:Animals; D000900:Anti-Bacterial Agents / Q000032:analysis / Q000737:chemistry*; D002417:Cattle; D004247:DNA / Q000032:analysis / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008751:Methylene Blue / Q000032:analysis* / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods*; D013752:Tetracycline / Q000032:analysis / Q000737:chemistry*
D000900:Anti-Bacterial Agents; D007477:Ions; D004247:DNA; C427203:calf thymus DNA; D000535:Aluminum; D013752:Tetracycline; D008751:Methylene Blue