Properties of DNA-Based Organic Dyes Doped Membranes
نویسنده
چکیده
The deoxyribonucleic acid (DNA) sodium salt was reacted with hexadecyltrimethylammonium bromide (CTMA) to obtain DNA-CTMA organic-solvent soluble complex. The DNA-CTMA was then mixed with three organic dyes such as Nile Blue A (NB), Disperse Red 1 (DR1) and Disperse Orange 3 (DO3) resulting in colored membranes, that were characterized by UV-Vis, FTIR, X-ray, ionic conductivity and fluorescence analysis. The FTIR and UV-Vis spectra confirmed DNA-CTMA formation. The X-ray diffractograms show that the dye molecules accommodate between adjacent base pairs of DNA-CTMA chains promoting their separation. It is evidenced by increase of macromolecular chains spacing and the size of interplanar distance in comparison with DNA membranes. The ionic conductivities of DNA-CTMA-NB and DNA-CTMA-DR1 were found to be of 4x10 S/cm and 1.6x10 S/cm at 27 C and 1.3x10 and 2.4x10 S/cm at 96 C, respectively. DNA-CTMADO3 ionic conductivities are of 6.7x10 S/cm at 26 C and 1.5x10 S/cm at 75 C. The photoluminescence spectra show that all the DNA-CTMAdye membranes exhibit fluorescence with intensities in agreement with structural analysis, being respectively of 40, 54 and 180 for DNA-CTMADisperse Red 1, DNA-CTMA-Nile Blue A and DNA-CTMA-Disperse Orange 3, in the same order as the observed increase of crystallinity of the samples.
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