Cai Changqun, Chen Xiaoming, Gong Hang
Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, Hunan 411105, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 Feb;72(1):46-9. doi: 10.1016/j.saa.2008.07.022. Epub 2008 Jul 26.
Methotrexate (MTX) as an antifolate, which is widely used as chemotherapeutic drugs. A high-dose MTX therapy has a direct toxicity influence on the non-germinal cells, especially the liver cells. It is known that the inject dose for adults is 10-30 mg and is half for children for routine use, while our experiments showed that the optimum dosage of MTX which enhanced the RLS intensities to the maximum is 4.54 ng ml(-1). The interaction of methotrexate (MTX) with nucleic acids in aqueous solution in the presence of cetyltrimethylammonium bromide (CTMAB), a kind of cationic surfactant similar to the Human cells, were investigated based on the measurements of resonance light scattering (RLS), UV-vis, fluorescence and NMR spectra, etc. The interaction has been proved to give a ternary complex of MTX-CTMAB-DNA in BR buffer (pH 9.30), which exhibits strong enhanced RLS signals at 339.5 nm.
