Microfluidic-based 18F-labeling of biomolecules for immuno-positron emission tomography |
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Authors: | Liu Kan Lepin Eric J Wang Ming-Wei Guo Feng Lin Wei-Yu Chen Yi-Chun Sirk Shannon J Olma Sebastian Phelps Michael E Zhao Xing-Zhong Tseng Hsian-Rong Michael van Dam R Wu Anna M Shen Clifton K-F |
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Affiliation: | College of Electronics and Information Engineering, Wuhan Textile University, Wuhan, China. |
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Abstract: | Methods for tagging biomolecules with fluorine 18 as immuno-positron emission tomography (immunoPET) tracers require tedious optimization of radiolabeling conditions and can consume large amounts of scarce biomolecules. We describe an improved method using a digital microfluidic droplet generation (DMDG) chip, which provides computer-controlled metering and mixing of 18F tag, biomolecule, and buffer in defined ratios, allowing rapid scouting of reaction conditions in nanoliter volumes. The identified optimized conditions were then translated to bench-scale 18F labeling of a cancer-specific engineered antibody fragments, enabling microPET imaging of tumors in xenografted mice at 0.5 to 4 hours postinjection. |
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