Iodogen Method on Iodine-131 (¹³¹I) Radiolabelling of Silver Nanoparticle (AgNPs) as a New Agent of Molecular Imaging

The application of nanomaterials in the treatment of various types of diseases continues to increase, including the use of silver nanoparticles (AgNPs). However, there still limitation in terms of the research on labelling AgNPs using radioactive compound such as 131I. The aim of this study is to carry out a method on 131I radiolabelling of AgNPs by using Iodogen as an iodination reagent. The radiolabelled 131I-AgNPs were then purified by using Sephadex-25 column chromatography with 0,05 M phosphate buffer solution as mobile phase for the first purification and HEPES solution for the second purification. The radiochemical purity of radiolabelled 131I-AgNPs was then determined by using autoradiography scanner. 131I-AgNPs with a purity 94,5±0,2121% were obtained after the purification. Stability test of the 131I-AgNPs was carried out by determining the radiochemical purity of the 131I-AgNPs on the first day until the fifth day of storage in the room temperature and refrigerator. The best stability of the 131I-AgNPs after purification resulted in radiochemical purity >90% until the fourth day and <90% on the fifth and subsequent days in both storages. This result shows that storage in the refrigerator can be a better choice rather than in the room temperature.