کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
743898 894374 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A wireless, remote-query sensor for real-time detection of Escherichia coli O157:H7 concentrations
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
A wireless, remote-query sensor for real-time detection of Escherichia coli O157:H7 concentrations
چکیده انگلیسی

This paper describes the real-time detection of Escherichia coli O157:H7 concentrations using a remote-query (wireless, passive) magnetoelastic sensor. The resonance frequency of a liquid immersed magnetoelastic sensor, measured through magnetic field telemetry, changes mainly in response to bacteria adhesion to the sensor and the liquid properties (viscosity, density, elasticity, etc.) of the culture medium. In the described application, during its growth and reproduction we find E. coli consumes nutrients from a liquid culture medium that decreases the solution viscosity, and in turn changes the resonance frequency of the medium-immersed magnetoelastic sensor. Using the described technique we are able to directly quantify E. coli O157:H7 concentrations of 2 × 102 to 3 × 106 cells ml−1, and quantify the effect of gentamycin sulfate injection (GSI) on proliferation of the bacteria. The lack of any physical connections between the sensor and the monitoring electronics facilitates aseptic operation, and makes the sensor platform ideally suited for monitoring bacteria from within, for example, sealed food containers.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 131, Issue 2, 14 May 2008, Pages 489–495
نویسندگان
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