Kuerner, Jens M. and Werner, Tobias (2000) A calix[4]arene based calcium-selective optode membrane: Measuring the absorbance maximum wavelength shift. FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY, 368 (8). pp. 759-762. ISSN 0937-0633
Full text not available from this repository. (Request a copy)Abstract
An absorbance based calcium ion sensor is presented which applies a new immobilized chromogenic calix[4]arene. The membrane consists of a hydrogel/1,3-pentanedial mixture and the 1,3-bis(indoaniline)-derived 2,4-bis-[(ethylcarbonyl)methoxy]-calix[4]arene as calcium receptor. The indicator entrapped within the gel was not rapidly washed out. Upon calcium complexation a batho-chromic shift up to 70 nm was observed along with an increase of the absorption coefficient. The dynamic range of calcium measurements is from 3 to 10 mM with a point of inflection of the calibration curve at a calcium concentration of about 7 mM. The concentration of calcium ions can be calculated from either absorbance at a distinct wavelength or - preferably when indicator leaching occurs - from the wavelength shift of the absorbance occurring when calcium levels are increased.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ION SENSOR; LIFETIME; DESIGN; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Mar 2022 10:03 |
| Last Modified: | 14 Mar 2022 10:03 |
| URI: | https://pred.uni-regensburg.de/id/eprint/42004 |
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