Asymmetric sandwich membrane system having reduced ascorbate interference
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United States of America Patent
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-
Nov 3, 1992
Grant Date -
N/A
app pub date -
Apr 30, 1991
filing date -
May 11, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is a diagnostic test device which comprises a fluid permeable structural support member having on one side thereof a layer of a macroporous membrane comprising polyethyleneimine impregnated with iodate ion and on the other side of the support member having a layer of a microporous membrane having dispersed therein a chromogenic indicator capable of providing a colored response upon being oxidized. The intensity of the colored response is less subject to ascorbate interference due to the activity of the iodate ion.
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