Radiosynthesis of 11C-Levetiracetam: A Potential Marker for PET Imaging of SV2A Expression
摘要:
The multistep preparation of C-11-levetiracetam ((CLEV)-C-11) was carried out by a one-pot radiosynthesis with 8.3 +/- 1.6% (n = 8) radiochemical yield in 50 +/- 5.0 min. Briefly, the propionaldehyde was converted to propan-l-imine in situ as labeling precursor by incubation with ammonia. Without further separation, the imine was reacted with C-11-HCN to form C-11-aminonitrile. This crude was then reacted with 4-chlorobutyryl chloride and followed by hydrolysis to yield C-11-LEV after purification by chiral high-performance liquid chromatography (HPLC). Both the radiochemical and enantiomeric purities of C-11-LEV were >98%.
Evaluation of the Formation and Stability of Hydroxyalkylsulfonic Acids in Wines
作者:Luciana C. de Azevedo、Marina M. Reis、Luiz F. Motta、Gisele O. da Rocha、Luciana A. Silva、Jailson B. de Andrade
DOI:10.1021/jf0709653
日期:2007.10.1
principal component analysis (PCA) and dissociationconstants, the results revealed that aliphatic aldehydes form adducts with S(IV), whereas ketones, cyclic aldehydes, and trans-alkenes interact weakly and are found predominantly in their free form. These results revealed also that pH 10 and 11 were defined as the most appropriate for CC-SO 2 adduct dissociation, and the total CCs were quantified reliably