Acridine, adsorption

Fig. 17. Schematic representation of naphthalene and acridine adsorption on silica surface.

The aligned-DNA, transparent, self-standing, and flexible film is of interest as a new naturally-occurring functional material, as well as an anisotropic conductive film. For example, the DNA-lipid film is effective as an adsorption filter of carcinogens such as acridine orange and ethidium bromide. The aligned-DNA film also shows polarization of light. 

Addition of sodium dodecyl benzene sulfonate to dilute alkaline electrolyte depresses the passivation of zinc surface [275]. Owing to the dodecyl benzene sulfonate adsorption, the passive layer on zinc has a loose and porous structure. Zinc electrodissolution was inhibited by the presence of sodium metasdicate [276] and some acridines [277]. The protection effect was described by a two-parameter equation. 

Studies on the adsorption of Congo Red on starch803-812 have shown that potato starch does not adsorb that dye. In contrast to Acridine Orange, this dye enables determination of the amylose content in varieties of starch. The following percentages of amylose have been reported812 wheat, 23 corn, 15 rice, 16 tapioca, 16.5 sweet potato, 2.8 and potato, 1.8. These results are suspect because of the relatively low amylose concentrations reported, particularly for sweet potato and potato. 

The fluorescence excitation spectrum of acridine in O.IN sulfuric acid has a band characteristic of acridinium cation at about 25000 cm, but on the other hand, acridine in ethanol has no band below 25000 cm" (see Fig. 8). The fluorescence excitation spectra of acridine both on SG200V and SG200A have a band near 25000 cra . These findings indicate that a proton is transferred to acridone from silanol groups in its ground state as a result of adsorption on the silica gel surface. The emission of acridine adsorbed on silica gel are reasonably assigned to the protonated species of acridine. 

The dominant fluorescence component of adsorbed acridine is assigned to the protonated species as the results of adsorption to silanol sites on the silica gel surface. The fluorescence decay data suggest that the emission band of hydrogen-bonded species underlies that of protonated acridone but no positive evidence was found on the fluorescence spectra. 

Acridone and acridine molecules have functional groups which are expected to interact with the silanol groups or other adsorption sites on a silica gel surface, and as was discussed in the... 

The acridine dye, Rivanol (2-ethoxy-6 9-diaminoacridine lactate), has been shown to be useful for the preparation of y-globulins. A 0.4 per cent solution of the dye added to plasma at pH 7.6-7.8 will precipitate all the plasma proteins except the y-globulins. The excess dye can then be removed by adsorption on Norit charcoal, and the y-globulins recovered by precipitation with 25 per cent ethanol at -5°C. 

Organic metals have also been used as the electrode material for the adsorption of peroxidase.The electrochemical properties of these organic metals, which are complexes of iV-methylphenazine (NMP ) or N-methyl-acridine (NMA ) with the anion radical of tetracyano-n-quinodimethane (TCNQ") with composition NMP TCNQ", NMP "(TCNQ")2, or NMA TCNQ , have been reported.Hydrogen peroxide electroreduction on the organic metals takes place in the presence of peroxidase for Er < 0.2 V (Figure 28). In the case of the enzyme adsorbed on NMP TCNQ", the reaction starts at Er> OS V. In the opinion of the authors, these data point to the presence of a direct electron exchange between the electrode and peroxidase. There are, however, certain apprehensions that, because of partial solubility, the organic metals may act as mediators. 

The bonding modes of pyridines described so far represent reasonable models for the adsorption and activation of pyridines, quinolines, and acridines on HDN catalysts, but none of them promotes C-N bond activation, which ultimately leads to nitrogen removal. In contrast, a curious t7 (N,G) coordination mode has been discovered, w hich... 

The chemical structures of synthetic dyes show considerable variety. They generally contain more than one aromatic group, condensed aromatic substructures or heterocyclic rings (pyrazolone, thiazole, acridine, thiazine, oxazine) which are mainly hydrophobic, and, frequently, a polar basic or cationic group which is strongly hydrophilic. Due to these structural characteristics, they readily bind both to polar adsorptive and apolar reversed-phase (RP) chromatographic supports, making their successful separation difficult. As the synthetic dyes are not volatile... 

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