Membrane filter including bile acid and a method of manufacturing the same
AssigneeWhatman, Inc.
InventorsKlaus Hochleitner, Suzana Kiel
Life of this patent
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Abstract
A membrane filter 26 is disclosed comprising cellulous material 23 allowing the transition of fluid therethrough, and, in a substantially dry state, said membrane comprising also a salt of deoxycholic acid. Optionally, the air side of the membrane (the side facing away from the screen or belt used to manufacture the membrane) faces the sample fluid during use of the membrane. A method of manufacture of the membrane material is disclosed also, employing deoxycholic acid as a surfactant, to improve the recovery rate of the membrane filter in use.
Claims14
A membrane filter formed from a fluid casting mix, wherein a bile acid or bile acid derivative is introduced during the manufacture of said membrane, and once dried the membrane comprising a membrane material for retaining microorganisms and also a residual salt of said bile acid or bile acid derivative.
A method of manufacturing a membrane filter material, the method including the steps of:
- a) preparing a casting mix, including cellulosic polymers, preferably cellulose nitrate and cellulose acetate dissolved in at least one organic solvent;
- b) introducing a surfactant in the casting mix including a bile acid or bile acid derivative;
- and
- c) casting the mix on a carrier belt to form the membrane filter material by controlled evaporation of the solvent(s), leaving the surfactant in the membrane filter material.
(canceled)
Dependencies are inferred from the claim text.