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Published on: April 25, 2025
Development of samarium [32P] phosphate colloid for radiosynoviorthesis applications: preparation, biological and
G Prabhakar1, Satbir S Sachdev, S Umamaheswari
1Radiopharmaceuticals Programme, Board of Radiation & Isotope Technology, BARC Vashi Complex, Sector-20, Navi Mumbai 400 705, India. gantipk47@rediffmail.com
Abstract:
A new therapeutic radio colloid for radiosynoviorthesis (RS) applications is reported. The method of preparation involves the reaction of SmCl3 carrier with carrier added [32P]H3PO4 in the presence of gelatin. The pure colloid was recovered by dialysis purification leading to radiochemical yield of around 90%. The radiochemical purity of the pure colloid formulated in isotonic saline was over 98%, for the usage period of 14 days, as assessed by paper chromatography. Ninety percent of colloid particles were in the size of 1-10 microm as evident from the laser diffraction particle size analysis, ideally suitable for the intended end use. Animal studies revealed complete retention of the radio colloid in the rabbit knee joint. The results of clinical trials in humans are satisfactory and encouraging, satisfactory retention of the colloid in the knee joint and negligible leakage into the systemic circulation.
