Asher, SA and Peteu, SF and Reese, CE and Lin, MX and Finegold, D
(2002)
Polymerized crystalline colloidal array chemical-sensing materials for detection of lead in body fluids.
Analytical and Bioanalytical Chemistry, 373 (7).
632 - 638.
ISSN 1618-2642
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Abstract
We have developed intelligent polymerized crystalline colloidal array (IPCCA) chemical-sensing materials for detection of Pb2+ in high ionic-strength environments such as body fluids with a detection limit of <500 nmol L-1 Pb2+ (100 ppb). This IPCCA lead sensor consists of a mesoscopically periodic array of colloidal particles polymerized into an acrylamide hydrogel. The array Bragg-diffracts light in the visible spectral region because of the periodic spacing of the colloidal particles. This material also contains a crown ether chelating agent for Pb2+. Chelation of Pb2+ by the IPCCA in low-ionic-strength solutions results in a Donnan potential that swells the gel, which red-shifts the diffracted light in proportion to the Pb2+ concentration. At high ionic strength the Donnan potential is, unfortunately, swamped and no static response occurs for these sensors. We demonstrate, however, that we can determine Pb2+ at high ionic strength by incubating these IPCCA in a sample solution and then measuring their transient response on exposure to pure water. The non-complexed ions diffuse from the IPCCA faster than the bound Pb2+. The resulting transient IPCCA diffraction red-shift is proportional to the concentration of Pb2+ in the sample. These IPCCA sensors can thus be used as sensing materials in optrodes to determine Pb2+ in high-ionic-strength solutions such as body fluids.
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Details
Item Type: |
Article
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Status: |
Published |
Creators/Authors: |
Creators | Email | Pitt Username | ORCID ![](/images/orcid_id_24x24.png) |
---|
Asher, SA | asher@pitt.edu | ASHER | | Peteu, SF | | | | Reese, CE | | | | Lin, MX | | | | Finegold, D | | | |
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Date: |
1 January 2002 |
Date Type: |
Publication |
Journal or Publication Title: |
Analytical and Bioanalytical Chemistry |
Volume: |
373 |
Number: |
7 |
Page Range: |
632 - 638 |
DOI or Unique Handle: |
10.1007/s00216-002-1366-z |
Schools and Programs: |
Dietrich School of Arts and Sciences > Chemistry |
Refereed: |
Yes |
ISSN: |
1618-2642 |
MeSH Headings: |
Acrylamide; Animals; Blood Chemical Analysis--methods; Body Fluids--chemistry; Cattle; Chemistry Techniques, Analytical--methods; Colloids--chemistry; Crystallization; Fetal Blood--chemistry; Hydrogel; Lead--analysis; Lead--blood; Osmolar Concentration; Polymers--chemistry; Scattering, Radiation; Sensitivity and Specificity; Water--chemistry |
PubMed ID: |
12185576 |
Date Deposited: |
23 Jan 2013 21:47 |
Last Modified: |
12 Jun 2021 23:55 |
URI: |
http://d-scholarship-dev.library.pitt.edu/id/eprint/17152 |
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