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

Shin Horikawa; Suiqiong Li; Yating Chai; Mi-Kyung Park; Wen Shen; James M. Barbaree; Vitaly J. Vodyanoy; Bryan A. Chin

doi:10.1117/12.883707

3 June 2011 Rapid detection of Salmonella typhimurium on fresh spinach leaves using phage-immobilized magnetoelastic biosensors

Shin Horikawa, Suiqiong Li, Yating Chai, Mi-Kyung Park, Wen Shen, James M. Barbaree, Vitaly J. Vodyanoy, Bryan A. Chin

Author Affiliations +

Proceedings Volume 8027, Sensing for Agriculture and Food Quality and Safety III; 802709 (2011) https://doi.org/10.1117/12.883707
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

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, goldcoated 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., phageimmobilized) were found to be statistically different from those for control sensors (sensors without phage), down to 5 × 10⁶ 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.

Citation Download Citation

Shin Horikawa, Suiqiong Li, Yating Chai, Mi-Kyung Park, Wen Shen, James M. Barbaree, Vitaly J. Vodyanoy, and Bryan A. Chin "Rapid detection of Salmonella typhimurium on fresh spinach leaves using phage-immobilized magnetoelastic biosensors", Proc. SPIE 8027, Sensing for Agriculture and Food Quality and Safety III, 802709 (3 June 2011); https://doi.org/10.1117/12.883707

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available