Isolation and expression of a mouse CB1 cannabinoid receptor gene. Comparison of binding properties with those of native CB1 receptors in mouse brain and N18TG2 neuroblastoma cells

The chiral separation of enantiomeric forms of derivatized amino acids have been achieved based on a metalchelate chiral capillary electrophoretic method and a cyclodextrin mediated host-guest interaction approach in micellar electrokinetic chromatography (MEKC) mode with laser-induced fluorescence detection. This approach has been applied to the determination of enantiomeric forms of amino acids derived from novel depsipeptide antitumor antibiotics, BMY-45012 and its analogs. Amino acids were analyzed by complete hydrolysis and the hydrolysate was derivatized with either dansyl chloride for UV absorbance detection or fluorescein isothiocyanate for laser based fluorescence detection. The presence of several amino acids, serine and beta-hydroxyl-N-methy-valine in the proposed structure have been confirmed as D-serine and L-beta-hydroxyl-N-methy-valine enantiomeric forms by both chiral capillary electrophoresis (chiral CE) and MEKC approaches. A non-chiral amino acid, sarcosine, was also confirmed. These methodologies provide a quick and sensitive approach for the determination of amino acids racemization of pharmaceutical natural products and have proven to be useful for structural elucidation refinement.