A mini-paper chromatography (MPC) system has been developed to analyze the radiochemical purity of 99mTc-HMPAO involving a 1:1 chloroform/tetrahydrofuran developing solvent. The MPC procedure is compared with the method of two thin layer chromatographic system and one paper chromatographic system (TLC/PC). The results of the paired t-tests show that radiochemical purities measured by MPC and TLC/PC do not difference significantly (P>0.05). For radiochemical purity values ranging from 74.2%- 96.4% (n=30)
the MPC and TLC/PC methods correlated closely (r= 0.97) with a regression equation of MPC (%) = 1.006 TLC/PC-0.323.