【摘要】 <正> 氨基聚醚（2.2.2）在pH6.4的柠檬酸-氢氧化钠缓冲液介质中与Pb（Ⅱ）形成稳定的络合物。此络合物在波长253nm有最大吸收,显色后,其吸光度立即达到最大,显色稳定,重现性好,可以用于紫外分光光度法测定PET（Positron Emission Tomography）药物¹⁸FDG更多还原

【Abstract】 Cryptand kryptofix 2. 2. 2 forms stable complex with lead ( I ) in the citric acid-NaOH media of pH 6- 4. The lead cryptate, absorbance coming to maximum immediately after being developed, having the peak absorption at 253 nm, with stable colour and good reproducibility, is suitable for the determination of microcryptand ( 2. 2. 2 ) in 18 FDG product by UV-spectrophotometry. The linear correlation coefficient of calibration 20-100 μg cryptand (2. 2. 2) and absorbance is more than 0. 999. The relative standard deviation for the determination of 5-10 μg cryptand (2. 2. 2) is±10%± 15%. The detection limit is 1-2 μg- The procedure is simple and speedy. The QC analysis of three parallel 18FDG samples can be completed within 20 min.更多还原