Add time:08/24/2019         Source:sciencedirect.com

Two methods were investigated for the no-carrier-added synthesis of N-succinimidyl 4-[18F]fluorobenzoate (S[18F]FB). The first, an attempted nucleophilic aromatic substitution by [18F]fluoride on N-succinimidyl 4-nitrobenzoate was unsuccessful. The second method involved three steps; [18F]fluoride for trimethylammonium substitution on 4-formyl-N,N,N-trimethylanilinium triflate, oxidation to 4-[18F]fluorobenzoic acid, followed by reaction with N-hydroxysuccinimide and dicyclohexylcarbodiimide to form S[18F]FB. Total synthesis and purification time was 100 min and the overall radiochemical yield was 25% (decay corrected). A monoclonal antibody F(ab′)2 fragment could be labeled in 40–60% yield by reaction with S[18F]FB for 15–20 min. The tissue distribution in normal mice and in vitro tumor binding of the antibody F(ab′)2 labeled by reaction with S[18F]FB were comparable to those observed for the fragment after radioiodination using N-succinimidyl 4-[125I]iodobenzoate.

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