کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
746917 | 894485 | 2007 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A wireless magnetoelastic α-amylase sensor A wireless magnetoelastic α-amylase sensor](/preview/png/746917.png)
A remote query, inexpensive and hence readily disposable α-amylase biosensor is described. The sensor is fabricated by immobilizing a layer of starch gel on a thick-film ribbon-like magnetoelastic sensor. In response to an ac magnetic field the magnetoelastic sensor replies with a return magnetic field, the characteristic resonance frequency of which is inversely dependent upon the attached mass load of the sensor. When exposed to α-amylase the resonance frequency of the starch gel-immobilized sensor increases in proportion to the starch hydrolyzation by α-amylase allowing for its quantification. The starch-immobilized sensor can also be used for the detection of urea and methamidophos based on the inhibition of urea and methamidophos to α-amylase. The sensor described here can detect 75 to 125 U/ml α-amylase, as well as 0.02–0.2% methamidophos, and 0.3–8 mmol/l urea.
Journal: Sensors and Actuators B: Chemical - Volume 121, Issue 2, 20 February 2007, Pages 476–481