An analytical device comprising a surfactant-treated porous reaction membrane having an exposed sample-contacting surface and at least one receptor area located in a limited region of the exposed sample-contacting surface. The limited region has a higher concentration of surfactant than areas of the...http://www.google.com.tw/patents/US6284194?utm_source=gb-gplus-share專利 US6284194 - Analytical assay device and methods using surfactant treated membranes to increase assay sensitivity
