Calcium complexing dyes and their use in analytical compositions, elements and methods
US4795712A · kind A · utility
9Cited by
9References
16Claims
0Family size
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Key dates
| Filing date | Apr 10, 1987 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Apr 10, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2800/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Novel chromogenic derivatives of 1,2-bis-(o-aminoaryloxy)ethane-N,N,N',N'-tetraacetic acid are useful for the determination of calcium ions in both solution and dry assays. These compounds comprise a dye moiety which is directly conjugated to the acetic acid substituted-nitrogen atom and which enables the compounds to exhibit maximum absorbance at a wavelength generally greater than 400 nm before complexation. When the compounds are complexed with calcium ions, the absorbance shifts to a shorter wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.