Rapid detection of Salmonella typhimurium on fresh spinach leaves using phage-immobilized magnetoelastic biosensors

被引:2
|
作者
Horikawa, Shin [1 ]
Li, Suiqiong [1 ]
Chai, Yating [1 ]
Park, Mi-Kyun [1 ]
Shen, When [1 ]
Barbaree, James M. [2 ]
Vodyanoy, Vitaly J. [3 ]
Chin, Bryan A. [1 ]
机构
[1] Auburn Univ, Dept Mech Engn, Auburn, AL 36849 USA
[2] Auburn Univ, Dept Sci Biol, Auburn, AL 36849 USA
[3] Auburn Univ, Dept Anat Physiol & Pharmacol, Auburn, AL 36849 USA
来源
SENSING FOR AGRICULTURE AND FOOD QUALITY AND SAFETY III | 2011年 / 8027卷
关键词
Salmonella typhimurium; spinach; rapid detection; biosensor; sensor; phage; magnetoelastic;
D O I
10.1117/12.883707
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
This paper presents an investigation into the use of magnetoelastic biosensors for the rapid detection of Salmonella typhimurium on fresh spinach leaves. The biosensors used in this investigation were comprised of a strip-shaped, gold-coated sensor platform (2 mm-long) diced from a ferromagnetic, amorphous alloy and a filamentous fd-tet phage which specifically binds with S. typhimurium. After surface blocking with bovine serum albumin, these biosensors were, without any preceding sample preparation, directly placed on wet spinach leaves inoculated with various concentrations of S. typhimurium. Upon contact with cells, the phage binds S. typhimurium to the sensor thereby increasing the total mass of the sensor. This change in mass causes a corresponding decrease in the sensor's resonant frequency. After 25 min, the sensors were collected from the leaf surface and measurements of the resonant frequency were performed immediately. The total assay time was less than 30 min. The frequency changes for measurement sensors (i.e., phage-immobilized) were found to be statistically different from those for control sensors (sensors without phage), down to 5 x 10(6) cells/ml. The detection limit may be improved by using smaller, micron-sized sensors that will have a higher probability of contacting Salmonella on the rough surfaces of spinach leaves.
引用
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页数:7
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