Lipidex-1000; cholesterol binding assay

[simon]

We are trying to use Lipidex-1000 (obtained as a dry powder from 
Sigma) to bind 3H-labelled cholesterol as part of a lipid-binding 
assay.

We swell the powder in  0.01 M phosphate, wash 5x with MeOH, and then 
wash back into phosphate. We find that it does not bind 3H-labelled 
cholesterol after this treatment (despite a number of literature 
reports claiming that this is possible).

Does anyone have any suggestions?

Thanks.

Simon 
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Dr Simon B Easterbrook-Smith    Phone: (+) 612 351 3905
Department of Biochemistry      FAX: (+) 612 351 4726
University of Sydney            Email: sbe at biochem.usyd.edu.au
Sydney NSW 2006
AUSTRALIA
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Every complex question has a simple, straight-forward,
easy to understand, wrong, answer.
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