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J Chromatogr B Analyt Technol Biomed Life Sci. 2005 Jun 5;820(1):143-5. Epub 2005 Apr 8.

A gel filtration assay to determine glycogen synthase activity.

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Clinical Department of Internal Medicine, Medical University of Innsbruck, Anichstrasse 35, A-6020 Innsbruck, Austria.


We developed a gel filtration assay for the determination of glycogen synthase activity in cultured cells or tissue homogenates. Compared to the commonly used filter paper assay, the gel filtration assay resulted in a more than 5-fold reduction of background levels leading to an--at least--twofold increase in precision. These benefits allow the gel filtration method to detect differences of +/-5% in enzyme activity out of 300 microg total cell protein. In addition to high precision and sensitivity, the method's additional salient advantages include lesser expenditure of time and labour and reduced exposure time of the personnel to radioactivity.

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