Journal of Lipid Research, Vol 35, 2100-2102, Copyright © 1994 by Lipid Research, Inc.
Removal of borate from tritiated gangliosides via the mannitoborate complex
HC Yohe
Department of Veterans Affairs Medical and Regional Office Center, White River Junction, VT 05001.
Purified gangliosides were radiolabeled by exposure to sodium boro
[3H]hydride in the presence of palladium on barium sulfate. After
centrifugation to remove the catalyst, borate was complexed with mannitol
and the resulting mannitoborate complex and salts were removed by reversed
phase chromatography. The labeled gangliosides were repurified by ion
exchange and silica gel chromatographies. Radiopurity was determined by
autoradiography of two-dimensional thin-layer chromatograms of the
gangliosides. The method eliminates the need for extensive dialysis or
repeated methanol evaporations to remove borate thus reducing time and the
volume of labeled waste.