Dehydration sensors with ion-responsive and charged polymeric surfactants
US8623292B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 2010 |
| Grant date | Jan 7, 2014 |
| Priority date | — |
| Expiry date | May 28, 2032 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2013/8473
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A lateral flow assay device for determining the relative ionic strength of urine is described. The device includes a buffering zone having a polyelectrolyte disposed therein, and an indicator zone having a pH indicator non-diffusively immobilized therein, the indicator zone being separate from the buffering zone and positioned adjacent to and in fluid communication with the buffering zone. A detection zone is part of the buffering zone, and has a buffering component comprising a weak polymeric acid and weak polymeric base with a pKa ≦10−3, and a class of charged polymeric surfactants that are responsive to relative ion concentrations in a sample solution, and a charged pH indicator with a charge opposite to that of the charged polymeric surfactant. The charged polymeric surfactant is soluble in amounts of greater than or equal to about 1% by weight (≧1 wt. % solute) in water and aqueous solutions of low ionic concentration of ≦0.1 wt. % salts, but insoluble (<1 wt. % solute) in aqueous solution of high ionic concentrations of >0.1 wt. % salts. The present invention also describes absorbent articles incorporating such an assay device and methods of monitoring dehydration or testing …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.