Dr. Claudia P. Coronel Aguilera Profile

Dr. Claudia P. Coronel Aguilera

at Purdue Univ

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Proceedings Article | 30 April 2019 Paper

Portable bioluminescence detection for food safety: smartphone vs. silicon photomultiplier

Iyll-Joon Doh, Hyun Jung Min, Claudia Coronel-Aguilera, Trevor Lim, Bruce Applegate, Euiwon Bae

Proceedings Volume 11016, 110160E (2019) https://doi.org/10.1117/12.2521452

KEYWORDS: Bioluminescence, Sensors, Signal to noise ratio, Silicon photomultipliers, Luminescence, Signal detection, Algorithm development

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Luminescence based detection has been widely used in diverse science and engineering applications. The recent development of the smartphone has enabled end users to utilize this communication device as a portable detector and instruments such as a microscope, fluorimeter, colorimeter, and spectrometer. To transform the smartphone into a bioluminescence detector, our group developed an advanced signal processing algorithm and an optical chamber designed for efficient photon capture. This solution was required to overcome the typical sensitivity of the CMOS-based smartphone camera such that sub-nano to pico Watt levels of power can be measured with conventional smartphones. Preliminary experiments conducted with the bioluminescent Pseudomonas fluorescens M3A shows a detection limit of approximately 10⁶ CFU/ml. To achieve sensitive detection while maintaining the portability, we explored using the recently developed silicon photomultiplier (SiPM), and designed a portable bioluminescence sensor which shows a 2-3 order higher sensitivity on calibration sample testing. Finally, for live sample testing, Escherichia coli O157:H7 was inoculated on a ground beef sample and subjected to luminescence phage based detection and a luminescence signal was generated from the bacteriophage infection and detected within 8-10 h after spiking.

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