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radiochemical purity
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  放射化学纯度
    HPLC-LSC and TLC-IIA demonstrated that its radiochemical purity exceeded 98% and spe-cific activity was 1.089±0.011 mCi/mmol.
    HPLC-LSC和TLC-IIA两种方法分析表明,其放射化学纯度大于98%,其比活度为1.089±0.011mCi/mmol.
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  radiochemical purity
The optimal amounts of DMAE (25 μl in 50 μl of ethanol) and tC18 (0.1 g) were found, providing a high radiochemical yield of the labeled choline (85%, corrected for radioactive decay) and radiochemical purity of more than 99.5%.
      
With 166Ho-albumin microspheres as example, an algorithm was developed for evaluation of the radiochemical purity of the preparation.
      
It was found that the radiochemical purity of the preparation, which is primarily determined by impurities of rare-earth elements, can be estimated from the content of 152mEu.
      
A simple "dry" procedure was developed for isolation of 186Re with a yield no less than 85% and radiochemical purity no worse than 99.99%.
      
The radiochemical purity of a 131I preparation (the iodide fraction) was determined by ascending paper chromatography using a mixture of sodium iodide, sodium iodate, and sodium carbonate as a carrier and aqueous methanol as an eluent.
      
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The fungicide 1-(4-chloro-phenoxy-)3,3-dimethyl-1(1-H, 1,2, 4-triazollyl-) 2-butanone ( Triadimefon ) was labelled with 14C in triazole group. The synthesis was accomplished in three steps starting with 14C-formic acid and aminoguanidine bicarbonate, Formed(5-14C)-3-amino-1-H-1,2, 4-triazole was deaminated by diazotization and got(5-14C )-1, 2, 4-triazole It reacted with p-chlorophenol and 1, l-dichloro-3,3-dimethy1-2-butanone in acetone, and 14C-Triadimefon was synthesized. Radiochemical yield was 26%(based...

The fungicide 1-(4-chloro-phenoxy-)3,3-dimethyl-1(1-H, 1,2, 4-triazollyl-) 2-butanone ( Triadimefon ) was labelled with 14C in triazole group. The synthesis was accomplished in three steps starting with 14C-formic acid and aminoguanidine bicarbonate, Formed(5-14C)-3-amino-1-H-1,2, 4-triazole was deaminated by diazotization and got(5-14C )-1, 2, 4-triazole It reacted with p-chlorophenol and 1, l-dichloro-3,3-dimethy1-2-butanone in acetone, and 14C-Triadimefon was synthesized. Radiochemical yield was 26%(based on 14C-formic acid) .Radiochemical purity was more than 95%.

本文报道了(三唑基-14C)-粉锈宁的制备。由14C-甲酸和重碳酸氨基胍形成(5-14C)-3-氨基-1,2,4-三唑,再经重氮化脱氨得到(5-14C)-1,2,4-三唑,最后再与对氯酚和二氯片呐酮反应得到(三唑基-14C)-粉锈宁。放化收率为26%(从甲酸-14C计),放化纯度大于95%。

1-p-chlorophenyl-2-(5-C-14) -1, 2, 4-triazol-l-yl-4, 4-dimethyl-pentan -3-01 ( Paclobutrazol) (1) was labelled by phase transfering method. The procedure involved the interaction of (5-C-14)-1,2,4-triazol with 1-chlc-ropinacolone in ethyl acetate to produce ( C-14 )-triazotylpinacolone ( 2). Then, (C-14)-triazotylpinacolone was reacted with p-chlorobenzyl ha-lide to produce (C-14)-triazolyl ketone in benzene (3), and finally(C-14) -triazolyl ketone was reduced by NaBH4 in methanol to give C-14-Paclo-butrazol.Chemical...

1-p-chlorophenyl-2-(5-C-14) -1, 2, 4-triazol-l-yl-4, 4-dimethyl-pentan -3-01 ( Paclobutrazol) (1) was labelled by phase transfering method. The procedure involved the interaction of (5-C-14)-1,2,4-triazol with 1-chlc-ropinacolone in ethyl acetate to produce ( C-14 )-triazotylpinacolone ( 2). Then, (C-14)-triazotylpinacolone was reacted with p-chlorobenzyl ha-lide to produce (C-14)-triazolyl ketone in benzene (3), and finally(C-14) -triazolyl ketone was reduced by NaBH4 in methanol to give C-14-Paclo-butrazol.Chemical yield was 52%, radio-chemical yield was 20.9%.HPLC and TLC analysis of the final product in methanol solution showed the radiochemical purity to be not less than 99%.

用相转移催化法标记合成了植物生长延缓剂1-对氯苯基-2-[(5-(14)~C)-1,2,4-三唑-1-基]4,4-二甲戊-3-醇((14)~C-多效唑)。其步骤包括在相转移催化剂PEG800的存在下,(5-(14)~C)-1,2,4-三唑与一氯片呐酮在乙酸乙酯溶液中反应,生成(5-(14)~C)-α-三唑基片呐酮,后者在苯溶液中再与对氯氯苄反应,生成(14)~C-三唑酮,最后在甲醇溶液中用硼氢化钠还原得到(14)~C-多效唑。其总放化收率为20.9%(以(14)~C-三唑计),放化纯度大于99%。

The preparation of 14C-sumithion and 14C-malathion is presented in this paper.From 14C-barium carbonate, the 14C-methanol is synthesized and used to react with PSCl3. Then 3 - methanol-4nitrophenol is added solution of 2-hexamonethe to obtain 14C-sumithion. Its radiochemical purity is over 95% and the specific activity is 188.7GBq/mol. On the other hand 2-butenoic acid diaethyl ester is added in the solution of methyl bengene, after addition of malathion and P2S5 to form the terminal product 14C-palathion....

The preparation of 14C-sumithion and 14C-malathion is presented in this paper.From 14C-barium carbonate, the 14C-methanol is synthesized and used to react with PSCl3. Then 3 - methanol-4nitrophenol is added solution of 2-hexamonethe to obtain 14C-sumithion. Its radiochemical purity is over 95% and the specific activity is 188.7GBq/mol. On the other hand 2-butenoic acid diaethyl ester is added in the solution of methyl bengene, after addition of malathion and P2S5 to form the terminal product 14C-palathion. Its radio chemical purity is over 95% and the specific activity is 156.4GBq/mol.

以Ba14CO3为起始原料制得14CH3OH,然后用14CH3OH与PSCl3在碱性条件下反应,再加入甲基硝基苯酚,在甲基异丁酮溶剂体系下制得14C-杀螟松,放化纯度>95%,放射性比活度为188.7BMq/mol。14CH3OH与P2S5合成出的中间体,加顺丁烯酸二乙酯在甲苯溶剂体系中反应制成14C-马拉硫磷,放化纯度>95%,放射性比活度为156.4MBq/mol。

 
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