Microscale synthesis of nitrogen-13-labeled cisplatin

Area of Science:

• Radiochemistry
• Nuclear Medicine
• Synthetic Chemistry

Background:

• Cisplatin (cis-dichlorodiammineplatinum(II), cis-DDP) is a crucial chemotherapeutic agent.
• Efficient synthesis of radiolabeled cisplatin ([13N]cisplatin) is vital for diagnostic imaging and targeted therapy research.
• Current synthesis methods may lack the speed and efficiency required for clinical translation.

Purpose of the Study:

• To develop and optimize a microscale synthesis of [13N]cisplatin using cyclotron-produced [13N]ammonia.
• To achieve high radiochemical purity and specific activity within a short timeframe.
• To establish a reproducible and efficient method for producing [13N]cisplatin for research and potential clinical use.

Main Methods:

• Microscale synthesis utilizing cyclotron-produced [13N]ammonia.
• Optimization of reaction parameters including temperature, time, reactant ratios, and concentrations.
• Purification via ion exchange chromatography.
• Quality control using high-performance liquid chromatography (HPLC) and high-performance thin-layer chromatography (HPTLC).

Main Results:

• Successful microscale synthesis of [13N]cisplatin achieved.
• Optimized reaction conditions led to efficient product formation.
• Purification yielded radiochemically pure [13N]cisplatin.
• Production of 22 mCi of [13N]cisplatin in 10 ml solution within approximately 15 minutes.
• Specific activity of approximately 300 mCi/μmole at the end of bombardment (EOB).

Conclusions:

• A rapid and efficient microscale synthesis of [13N]cisplatin has been established.
• The optimized method provides high yields of radiochemically pure [13N]cisplatin.
• This synthesis is suitable for producing [13N]cisplatin for further research and potential clinical applications in nuclear medicine.