. Cell chemistry; a collection of papers dedicated to Otto Warburg on the occasion of his 70th birthday. Warburg, Otto Heinrich, 1883-; Biochemistry. VOL. 12 (1953) CARCINOGENIC COMPOUNDS, PURINES AND NUCLEIC ACID 81 TABLE II SOLUBILITY OF 3:4-6 ly-DIBENZACRIDINE IN CAFFEINE AND SODIUM DEOXYRIBONUCLEATE SOLUTIONS Caffeine Caffeine cone, (ft mols/i) DBA cone, (/i mols/i) Sodium Deoxyribonucleate DNA cone, {fimols/i) DBA cone. (nmolsU) 14,000 59 237 230 56 4 21,000 130 162 460 75 6 28,000 204 138 920 114 8 276 126 1,380 126 II 42,000 377 III 1,840 136 14 49,000 477 103 2,300 165
. Cell chemistry; a collection of papers dedicated to Otto Warburg on the occasion of his 70th birthday. Warburg, Otto Heinrich, 1883-; Biochemistry. VOL. 12 (1953) CARCINOGENIC COMPOUNDS, PURINES AND NUCLEIC ACID 81 TABLE II SOLUBILITY OF 3:4-6 ly-DIBENZACRIDINE IN CAFFEINE AND SODIUM DEOXYRIBONUCLEATE SOLUTIONS Caffeine Caffeine cone, (ft mols/i) DBA cone, (/i mols/i) Sodium Deoxyribonucleate DNA cone, {fimols/i) DBA cone. (nmolsU) 14,000 59 237 230 56 4 21,000 130 162 460 75 6 28,000 204 138 920 114 8 276 126 1,380 126 II 42,000 377 III 1,840 136 14 49,000 477 103 2,300 165 14 56,000 600 93 2,760 165 17 63,000 702 90 3,220 158 20 70,000 840 84 3,700 144 26 4,200 136 31 and dried. The properties of compounds prepared in this way are shown in Table III. i:2-6:7-Dibenzacridine was not sufficiently soluble in ethanol to prepare a molecular compound by this method. Spectrophotometric analysis of the molecular compounds. Absorption spectra of benzene or ethanol solutions of the molecular compounds of hydrocarbons prepared by Weil-Malherbe [ i mol. 3:4-benzpyrene + 2 mols. tetramethyluric acid) and of the dibenzcarbazole and dibenzacridine complexes were found to be the sum of the ab-. 360 380 wo Wavelength Cm/n) Fig. 6. Absorption spectra of 3:4-benzpyrene- tetramethyluric acid compound and its com- ponents in benzene. , 3:4-benzpyrene; , tetramethyluric acid; , molecular compound; - , calculated curve for i mol. 3:4-benzpyrene -j- 2 mols. tetramethyluric acid. References p. 87. 320 340 360 Wavelength (irtf/.) Fig. 7. Absorption spectra of 3:4-5:6-dibenz- carbazole-cafEeine compound and its components in ethanol. , 3:4-5:6-dibenzcarbazole; caffeine; , molecular compound; , calculated curve for i mol. 3:4-5:6-dibenz- carbazole + I mol. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the o
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