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Cholesteric Liquid Crystal Photonic Hydrogel Films Immobilized with Urease Used for the Detection of $Hg^{2+}$
| Content Provider | MDPI |
|---|---|
| Author | Liu, Jie Tai, Wenjun Wang, Deliang Su, Jie Yu, Li |
| Copyright Year | 2022 |
| Description | Mercury ion is one of the most widespread heavy metal contaminants which can accumulate in the body through multiple channels, posing a detrimental impact on human health. We demonstrate a simple and low-cost method for the detection of $Hg^{2+}$ assisted by a cholesteric liquid crystal photonic hydrogel (polyacrylic acid (PAA)) film with immobilized urease $(CLC-PAA_{urease}$ film). In the absence of $Hg^{2+}$, a significant change in color and an obvious red shift in the reflected light wavelength of the prepared film were observed, since urease can hydrolyze urea to produce $NH_{3}$, resulting in an increasing pH value of the microenvironment of $CLC-PAA_{urease}$ film. $Hg^{2+}$ can inhibit the activity of urease so that the color change of the film is not obvious, corresponding to a relatively small variation of the reflected light wavelength. Therefore, $Hg^{2+}$ can be quantitatively detected by measuring the displacement of the reflected light wavelength of the film. The detection limit of $Hg^{2+}$ is about 10 nM. This approach has a good application prospect in the monitoring of heavy metal ions in environmental water resources. |
| Starting Page | 140 |
| e-ISSN | 22279040 |
| DOI | 10.3390/chemosensors10040140 |
| Journal | Chemosensors |
| Issue Number | 4 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-04-08 |
| Access Restriction | Open |
| Subject Keyword | Chemosensors Analytical Chemistry Cholesteric Liquid Crystal Photonic Hydrogel Film Polyacrylic Acid Mercury Ion Detection |
| Content Type | Text |
| Resource Type | Article |
