A method for measurement of the specific radioactivity of the choline moiety of choline phospholipids
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Add time:07/29/2019 Source:sciencedirect.com
The specific radioactivity of a choline phospholipid has been determined by a double-isotope method. Purified phospholipid was hydrolyzed to release labeled choline, and choline kinase was employed to label the choline with 32P from [γ-32P]ATP. The double-labeled phosphorylcholine was purified by ion-exchange chromatography on QAE-Sephadex, and the specific radioactivity of the choline was calculated from the isotope ratio. The method is sensitive, requiring only 5 nmol of choline with a specific radioactivity of 1 μCl/μmol, and the chromatographic isolation of phosphorylcholine is simple and reproducible.
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