| | 1 | Author
| Norio Miyoshi, Giiti Tomita | Requires cookie* | | | Title
| Production and Reaction of Singlet Oxygen in Aqueous Micellar Solutions Using Pyrene as Photosensitizer  | | | | Abstract
| The reaction of singlet oxygen with 1,3-diphenylisobenzofuran was investigated in aqueous micellar solutions of sodium dodecyl sulfate and dodecyl trimethylammonium chloride using pyrene as photosensitizer. Singlet oxygen, produced by the photosensitiza-tion of pyrene bound to micelles, oxidized efficiently 1,3-diphenylisobenzofuran bound to micelles. The quantum yield for singlet oxygen production and the rate constant for furan oxidation were determined by the kinetic analysis for the oxidation reaction of furan. Quenching of singlet oxygen by sodium azide competed with the furan oxidation, and its rate constant was also determined. Results obtained were compared with those in methanolic solutions. The quantum yield for singlet oxygen production and the rate constant for furan oxidation were much higher in micellar solutions than those in methanolic solutions. Empty micelles w x as found to act as a considerably strong scavenger for singlet oxygen. The penetration probability of singlet oxygen from aqueous phase into the interior of micelles which bound furan was also estimated. | | | |
Reference
| Z. Naturforsch. 33b, 622—627 (1978); received February 24 1978 | | | |
Published
| 1978 | | | |
Keywords
| Singlet Oxygen, Pyrene, Diphenylisobenzofuran, Micelles | | | |
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| | | | | TEI-XML for
| default:Reihe_B/33/ZNB-1978-33b-0622.pdf | | | | Identifier
| ZNB-1978-33b-0622 | | | | Volume
| 33 | |
| 2 | Author
| SeymourSteven Brody | Requires cookie* | | | Title
| Temperature Induced S p ectral C h an ges o f Chlorophyll in M ic e lle s and S o lu tio n | | | | Abstract
| Effects of temperature on the spectral properties o f chlorophyll in solution and in m icelles are reported. After correcting for the volum e expansion coefficient o f the solvent, it is observed that temperature has no detectable effects on the spectral properties o f chlorophyll (between 14 °C to 35 °C). Solutions exam ined include acetone, chloroform and ethyl alcohol. It is concluded that the temperature induced change in refractive index, o f the solvent, has no significant affect on the chlorophyll sp ec trum. In micelles containing chlorophyll there are significant temperature induced spectral changes. Heating and cooling results in an irreversible redistribution o f m onom eric and oligomeric forms o f chlorophyll. | | | |
Reference
| Z. Naturforsch. 39c, 685—686 (1984); received February 17 1984 | | | |
Published
| 1984 | | | |
Keywords
| Chlorophyll, Micelles, Vesicles, Spectral Changes | | | |
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| | | | | TEI-XML for
| default:Reihe_C/39/ZNC-1984-39c-0685_n.pdf | | | | Identifier
| ZNC-1984-39c-0685_n | | | | Volume
| 39 | |
| 3 | Author
| J. Schmidt, H. Gottstein, Scheer, A. Scherz | Requires cookie* | | | Title
| A | | | | Abstract
| Micellar aggregates have been prepared from chloro phyll a. Whereas most detergents including non-ionic, zwitterionic and anionic ones, produce aggregates with long-wavelength shifted and enhanced Q Y absorption, the cationic detergents hexadecyl-trimethylammonium-bromide and hexadecyl-pyridiniumchloride produce complexes with opposite traits: The Q Y absorption is shifted to shorter wavelengths, and it is hypochromic. The optical activity is increased as in the long-wave length shifted complexes, but the cd bands are non-con servative and coincide with the absorption maxima. The complexes are most likely small aggregates o f chloro phyll with a changed geometry as compared to the "standard" ones. | | | |
Reference
| Z. Naturforsch. 45c, 729—732 (1990); received January 26 1990 | | | |
Published
| 1990 | | | |
Keywords
| Chlorophyll, Micelles, Detergent, Aggregation, Absorp tion, Circular Dichroism, Molecular Orbital | | | |
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| default:Reihe_C/45/ZNC-1990-45c-0729_n.pdf | | | | Identifier
| ZNC-1990-45c-0729_n | | | | Volume
| 45 | |
| 4 | Author
| IouriE. Borissevitcha+, ChristianeP F Borgesa++, GalinaP. Borissevitcha+++, VictorE. Yushmanova+, SoniaR W Louroh, Marcel Tabaka | Requires cookie* | | | Title
| Binding and Location of Dipyridamole Derivatives in Micelles: the Role of Drug Molecular Structure and Charge | | | | Abstract
| Binding and localization of the vasodilator and antitumor drug coactivator dipyridamole (D IP) and of its three derivatives, RA14. RA47 and RA25 (D IP D), to cationic (cetyltrimeth-ylammonium chloride), anionic (sodium dodecylsulfate), zwitterionic (N-hexadecyl-N.N-di-methyl-3-ammonio-l-propanesulfonate). and neutral (r-octylphenoxypolyethoxyethanol) m i celles was studied using fluorescence, optical absorption and 'H N M R spectroscopy. The analysis of N M R . optical absorption and fluorescence data indicates that the depth of local ization of the drugs in the micelles from the surface decreased in the order D IP > RA 14 > RA47 > RA25. The binding constants for the neutral drug forms change in the same order in the range of 1400-3100 m _1 for D IP to 80-300 m _1 for RA25. This order is identical with the reported biological activity of D IP D . For the protonated drugs in zwitterionic or neutral micelles the binding constants are reduced by a factor of 20-75. | | | |
Reference
| Z. Naturforsch. 51c, 578—590 (1996); received March 28/May 31 1996 | | | |
Published
| 1996 | | | |
Keywords
| Dipyridamole and Derivatives, Micelle, Drug Location, Absorption, Fluorescence, N M R | | | |
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| default:Reihe_C/51/ZNC-1996-51c-0578.pdf | | | | Identifier
| ZNC-1996-51c-0578 | | | | Volume
| 51 | |
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