Application of a surface acoustic wave sensor system for the detection of non-aqueous solutions and phase transitions in lipid multibilayers
✍ Scribed by Shouzhuo Yao; Kang Chen; Lihua Nie
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 687 KB
- Volume
- 289
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A surface acoustic wave (SAW) sensor system utilizing a SAW resonator operating at 61 MHZ and a pair of parallel electrodes in series was applied to the detection of organic mixtures. Linear frequency shifts were observed as the water content of organic solvents changed. The detection limit was 2 mg I -l. The behaviour of the dielectric constant and conductivity of the lipid multibilayer during phase transition (from solid to liquid crystal) was measured with the SAW sensor system using polymer-coated electrodes. Large frequency changes were also observed for lecithin extracted from egg yolk at the phase transition temperature.
K&y wora!r: Acoustic methods; Sensors; Lipids; Phase transitions * Corresponding author. tric constant, will result in a shift of the resonator frequency of the device. Factors producing such an effect also include environmental temperature and pressure [8]. The extreme sensitivity of the SAW device makes it attractive as a gas sensor. The development of liquid-phase sensors is of interest in many areas, including biochemistry, immunology and electrochemistry. However, many problems arise when SAW sensors are applied in the liquid phase owing to the large energy loss in the propagation of the Rayleigh wave [91.