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Abstract  

This work reports the synthesis, radiolabeling and preliminary biodistribution results in tumor-bearing mice of the 99mTc(CO)3–AOPA colchicine conjugate. The novel ligand was successfully synthesized by conjugation of N-(acetyloxy)-2-picolylamino (AOPA) to deacetylcolchicine via a short carbonyl-methylene linker. Radiolabeling was performed in high yield with [99mTc(CO)3]+ core. 99mTc(CO)3–AOPA colchicine conjugate was hydrophilic and was stable at room temperature. Biodistribution studies in tumor-bearing mice showed that 99mTc(CO)3–AOPA colchicine conjugate accumulated in the tumor with good uptake and retention. However, its clearance from normal organs was not so fast, resulting in poor T/NT ratios. Further modification on the linker or/and 99mTc-chelate to improve the tumor targeting efficacy and in vivo kinetic profiles is currently in progress.

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Abstract  

The TRPO process has been developed in China for removing transuranium (TRU) elements from the high-level liquid waste (HLLW) since 1980s. In order to meet the requirements of the TRPO process tests, a series of annular centrifugal contactors have also been developed at the Institute of Nuclear and New Energy Technology (INET), Tsinghua University, China. In particular, the Ø10 mm annular centrifugal contactor has been applied successfully in laboratory scale tests of the TRPO process. The Ø70 mm annular centrifugal contactor for semi-industry scale tests of the TRPO process has good performance and two design characteristics, namely a modular design and an overflow structure.

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Journal of Radioanalytical and Nuclear Chemistry
Authors:
Xiaobei Zheng
,
Feng Dong
,
Jing Yang
,
Xiaojiang Duan
,
Tingting Niu
,
Wangsuo Wu
, and
Jianjun Wang

Abstract  

This work reports the synthesis and preliminary biodistribution results of [131I]SIB-PEG4-CHC in tumor-bearing mice. The tributylstannyl precursor ATE-PEG4-CHC was synthesized by conjugation of ATE to amino pegylated colchicine NH2-PEG4-CHC. [131I]SIB-PEG4-CHC was radiosynthesized by electrophilic destannylation of the precursor with a yield of ~44%. The radiochemical purity (RCP) appeared to be >95% by a Sep-Pak cartridge purification. [131I]SIB-PEG4-CHC was lipophilic and was stable at room temperature. Biodistribution studies in tumor-bearing mice showed that [131I]SIB-PEG4-CHC cleared from background rapidly, and didn’t deiodinate in vivo. However, the poor tumor localization excluded it from further investigations as a tumor-targeted radiopharmaceuticals.

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Abstract  

This work reports the synthesis, radiolabeling and preliminary biodistribution results in tumor-bearing mice of [99mTc(CO)3(IDA–PEG3–CB)]. The novel chlorambucil derivative was successfully synthesized by conjugation of iminodiacetic acid (IDA) to chlorambucil via a pegylated linker. The ligand could be labeled by [99mTc(CO)3]+ core in high yield to get [99mTc(CO)3(IDA–PEG3–CB)], which was very hydrophilic and was stable at room temperature. Biodistribution studies in tumor-bearing mice showed that [99mTc(CO)3(IDA–PEG3–CB)] accumulated in the tumor with favorable uptake and retention. The good accumulation in tumor tissue with high tumor/muscle ratios warrants further research to improve tumor targeting efficacy and pharmacokinetic profile of radiolabeled chlorambucil derivative by structural modification.

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Abstract  

This study reports the synthesis, radiolabeling and preliminary biodistribution results of [99mTc(CO)3(MN-TZ-BPA)]+ in tumor-bearing mice. The novel nitroimidazole derivative was successfully synthesized by conjugation of bis(pyridin-2-ylmethyl)amine (BPA) to 2-methyl-5-niroimidazole via “click” reaction. The ligand could be labeled by [99mTc(CO)3]+ core in high yield to get [99mTc(CO)3(MN-TZ-BPA)]+, which was very hydrophilic and was stable at room temperature. Biodistribution studies in tumor-bearing mice showed that [99mTc(CO)3(MN-TZ-BPA)]+ accumulated in the tumor with certain initial uptake while poor retention. The rapid clearance from normal organs with favorable tumor/muscle ratios warrants further research to improve tumor targeting efficacy and pharmacokinetic profile of radiolabeled nitroimidazoles by structural modification.

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Abstract

Translation assessment represents a productive line of research in Translation Studies. An array of methods has been trialled to assess translation quality, ranging from intuitive assessment to error analysis and from rubric scoring to item-based assessment. In this article, we introduce a lesser-known approach to translation assessment called comparative judgement. Rooted in psychophysical analysis, comparative judgement grounds itself on the assumption that humans tend to be more accurate in making relative judgements than in making absolute judgements. We conducted an experiment, as both a methodological exploration and a feasibility investigation, in which novice and experienced judges were recruited to assess English-Chinese translation, using a computerised comparative judgement platform. The collected data were analysed to shed light on the validity and reliability of assessment results and the judges’ perceptions. Our analysis shows that (1) overall, comparative judgement produced valid measures and facilitated judgement reliability, although such results seemed to be affected by translation directionality and judges’ experience, and (2) the judges were generally confident about their decisions, despite some emergent factors undermining the validity of their decision making. Finally, we discuss the use of comparative judgement as a possible method in translation assessment and its implications for future practice and research.

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