Preparation and biodistribution of radioiodinated analgin as a possible inflammatory imaging agent

Abstract

Direct radioiodination of analgin with 125I was carried out using chloramine-T as an oxidizing agent. The labeling conditions were optimized. When performed with 50 μg of analgin and 10 μg of chloramine-T at pH 9 for 15 min at room temperature, the reaction gives 97.5 ± 1.2% radiochemical yield of 125I-analgin. The radiochemical yield of the final product was determined by electrophoresis and HPLC. Biodistribution studies were carried out in normal Albino Swiss mice and in those with septic and aseptic inflammations at different time intervals after administration of radioiodinated analgin. It was found that radioiodinated analgin differentiates between septic and aseptic inflammations and can be used to detect inflammation.