Nuclear medicine and magnetic resonance bimodal development drug, drug precursor, preparation method and application
A technology of magnetic resonance and nuclear medicine, applied in the preparation of folic acid receptor-positive tumor imaging drugs, the field of nuclear medicine and magnetic resonance imaging dual-mode drug precursors
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[0043] In another specific embodiment, a method for preparing a nuclear medicine and magnetic resonance imaging dual-modality imaging prodrug is provided, comprising the following steps:
[0044] (a) Using 3-aminopropyltriethoxysilane to modify the surface of superparamagnetic iron oxide nanoparticles to obtain SPIONs-APTES;
[0045] (b) coupling of folic acid and polyethylene glycol to obtain FA-PEG;
[0046] (c) SPIONs-APTES reacts with FA-PEG to obtain SPIONs-PEG-FA, which is then coupled with 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid to obtain DOTA-SPIONs-PEG-FA, the nuclear medicine and magnetic resonance dual-modal imaging drug precursor.
[0047] Among them, FA-PEG is obtained through the following steps: coupling of folic acid and N-hydroxysuccinimide (NHS) to obtain FA-NHS; FA-NHS and NH 2 -PEG-COOH reaction yields FA-PEG.
[0048] Through the above synthesis method and labeling with radioactive metal nuclides, a PET / MRI dual-mode imaging drug with c...
Embodiment 1
[0054] Example 1 PET / MRI dual-modal imaging prodrug DOTA-SPIONs-PEG-FA and PET / MRI dual-modal imaging drug 64 Preparation of Cu-DOTA-SPIONs-PEG-FA
[0055] 1. Preparation of SPIONs
[0056] Synthesis reaction in N 2 under protection. 549mg FeCl 3 ·6H 2 O and 282mg FeSO 4 ·7H 2 O was dissolved in 40mL deoxygenated water, and stirred to dissolve. Aqueous ammonia was added dropwise to adjust the pH to 9. Then the temperature was raised to 50° C., and the reaction was continued for 1 h. After the reaction was completed, wash with 50 mL of deoxygenated water, and pour it by magnet adsorption to remove the ammonium salt, repeating 3 times. The product was vacuum-dried at 60°C to obtain 123 mg of black lumpy solid SPIONs with a yield of 53%, which was stored at 4°C.
[0057]
[0058] Product FT-IR (cm -1 ) (IRAffinity-1 Fourier Transform Infrared Spectrometer, Japan SHIMADAZU Company): 3419.7, 1623.0, 576.7. Magnetic measurement (BKT-4500Z vibrating sample magnetometer...
Embodiment 2
[0089] Embodiment 2 in vitro stability research
[0090] 100μL 64 Cu-DOTA-SPIONs-PEG-FA marker (~0.37MBq) was added to 200 μL phosphate buffered saline solution PBS (pH=7.4), incubated at 37°C, after incubation for 0h, 4h, and 12h, samples were taken and analyzed by rapid Determination of radiochemical purity by thin layer chromatography.
[0091] The results showed that when the marker was incubated in PBS for 4 hours, it still maintained good radiochemical purity stability, which was above 93%. After a half-life (12h), the radiochemical purity dropped to 85%. This shows that the marker is basically stable within 4h.
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