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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Anzai, Jun-ichi Yoshida, Kentaro Nagasaka, Munenari Hoshi, Tomonori Sato, Katsuhiko |
| Description | Country affiliation: Japan Author Affiliation: Nagasaka M ( Graduate School of Pharmaceutical Sciences, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan.) |
| Abstract | Layer-by-layer (LbL) thin films composed of fluorescein-modified poly(allylamine) (F-PAH) and poly(styrenesulfonic acid) (PSS) were prepared on the surface of an indium-tin oxide (ITO) electrode and the electrode potential-dependent colorimetric response of the LbL films was studied in the presence of hydrogen peroxide (H(2)O(2)). The LbL films were prepared by an alternate deposition of F-PAH and PSS on the surface through an electrostatic force of attraction. The LbL films exhibited a UV-visible absorption band around 500 nm originating from fluorescein residues in the film and the intensity of the absorption band depended on the pH of the solution to which the LbL film is exposed. The absorbance of the film was higher at neutral pH than that in weakly acidic solutions. The intensity of the absorption band decreased when an electrode potential higher than 0.6 V was applied in the presence of H(2)O(2), while virtually no response was observed at lower electrode potential. The colorimetric response was suppressed in solutions with higher buffer capacity. The results were rationalized on the basis of the changes in local pH at the vicinity of the electrode surface, which in turn was induced by electrolysis of H(2)O(2) on the electrode surface. A possible application of the system for colorimetric sensing of H(2)O(2) was discussed. |
| ISSN | 00219797 |
| Issue Number | 2 |
| Volume Number | 348 |
| e-ISSN | 10957103 |
| Journal | Journal of Colloid and Interface Science |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2010-08-15 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Fluoresceins Chemistry Hydrogen Peroxide Membranes, Artificial Polyamines Colorimetry Electrodes Analysis Hydrogen-ion Concentration Polystyrenes Spectrophotometry, Ultraviolet Journal Article Discipline Colloid & Interface Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Colloid and Surface Chemistry Biomaterials Electronic, Optical and Magnetic Materials |
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