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- W1968605333 abstract "La méthode employée présentant L'avantage de ne pas entraǐner de dilution isotopique, L'activité spécifique des produits obtenus est celle de la base marquée de départ. La technique de purification employée garantit une pureté supérieure à 99,5%. La formation épisodique de substances secondaires radioactives indique que certaines cultures contiennent une désaminase active sur les desoxyribonucléoside puriques. Une activité nucléosidasique agissant sur thymidine et d-uridine a été mise en évidence. 14C-labelled deoxyribonucleosides have been prepared by enzymatic transfer of deoxyribose from a d-nucleoside on to the labelled pyrimidine or purine base selected. The operation is effected in a single stage with a crude enzyme extract of Lactobacillus helveticus. With carefully studied reaction conditions donor/base concentration ratio and temperature — the following substances and yields were obtained: d-adenosine (95%) d-guanosine (95%) d-inosine (90%) thymidine (80%) d-cytidine (95%) d-uridine (73%). As the method employed has the advantage of not entailing isotopic dilution, the specific activity of the substances obtained is the same as that of the initial labelled base. The purifying technique used ensures a purity of over 99.5%. The episodic formation of secondary radioactive substances indicates that certain cultures contain a deaminase which acts on purine deoxyribonucleosides. A nucleosidase activity affecting thymidine and d-uridine was demonstrated. On a effectué la préparation de desoxyribonucléosides marqués au 14C par transfert enzymatique de desoxyribose d'un d-nucléoside sur la base pyrimidique ou purique marquée choisie. L'opération se fait en une seule étape avec un extrait enzymatique brut de Lactobacillus helveticus. L'étude des conditions de réaction, rapport des concentrations donneur/base et température, a permis d'obtenir les produits suivants avec les rendements respectifs de : d-adénosine (95%) d-guanosine (95%) d-inosine (90%) thymidine (80%) d-cytidine (95%) d-uridine (73%)." @default.
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- W1968605333 date "1966-01-01" @default.
- W1968605333 modified "2023-09-25" @default.
- W1968605333 title "Préparation de desoxyribonucléosides marqués au14C sur la base" @default.
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- W1968605333 doi "https://doi.org/10.1002/jlcr.2590020103" @default.
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