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Integrated sensor for the rapid identification of bacteria using isfets

a sensor and bacteria technology, applied in the field of integrated sensors for the rapid identification of bacteria using isfets, can solve the problems of laborious sample preparation, difficult sample preparation, and difficult preparation of samples, and achieve the effects of reducing the number of samples

Inactive Publication Date: 2014-05-22
GULAK GLENN +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a system and method for an integrated sensor that can quickly detect bacteria using special semiconductor technology. This technology has advantages over traditional methods of detecting bacteria, which can take longer and require specialized equipment. The invention allows for the development of more efficient and cost-effective sensors for detecting bacteria in various applications.

Problems solved by technology

Traditional culturing methods take several hours to days to give results.
They require trained personnel to perform the tests as well as expensive laboratory equipment.
The disadvantages of these methods are laborious sample preparation.
More importantly, these methods primarily do not distinguish between living and dead bacterial cells.

Method used

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  • Integrated sensor for the rapid identification of bacteria using isfets
  • Integrated sensor for the rapid identification of bacteria using isfets
  • Integrated sensor for the rapid identification of bacteria using isfets

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0056]Live bacterial cells and phages were used on the chip in demonstration of the ISFET system 600. Before starting the experiments, the chips may be cleaned and potassium-sensitive ISFET chips prepared as explained in the previous sections.

[0057]The measurements were done using two strains of like E.coli K-12 bacterial cells. The positive control experiments were performed using E.coli K-12 BL21 (DE-Δtail), called BL21 here for simplicity, which are sensitive to phage T6. The negative control experiments were performed using bacterial cells E.coli K-12 BW25113 with TSX−, called TSX− here, which are insensitive to phage T6. The phages used throughout the experiments were T6 phages.

[0058]Bacterial cultures were prepared overnight using frozen cultures inoculated in luria broth (LB) growth media. The overnight cultures were then inoculated to make fresh samples to be used the same day. The growth of the cells was monitored using a spectrophotometer that read the optical density (OD)...

example 3

[0079]This example demonstrates that lysostaphin can be used to detect the presence of a bacterium in a sample using methods and devices according to the present disclosure. In this example, the lysostaphin from Staphylococcus simulans was combined with Staphylococcus aureus 8325 as the positive control. As negative controls, lysostaphin from Staphylococcus simulans was combined with E.coli K12 BW25113, and lysostaphin from Staphylococcus simulans was combined with Pseudomonas aeruginosa (PA01).

[0080]FIG. 11 shows the results of both positive and negative control experiments. As indicated, the integrated potassium-sensitive chip can detect the presence of the specific bacterial strain Staphylococcus aureus 8325 using the lysostaphin from Staphylococcus simulans. As shown, the output increases as a result of the efflux of potassium ions from cells in the positive control test, as compared to the negative controls.

example 4

[0081]This example demonstrates that antibiotics can be used to detect the presence of a bacterium in a sample using methods and devices according to the present disclosure. In this example, the Polymyxin B antibiotic (PMB) was combined with E.coli K12 BW25113 in SM buffer as the positive control. As the negative control, Polymyxin B antibiotic (PMB) combined with E.coli K12 BL21 (DE3-Δtail) (referred to as BL21) in SM buffer. Experiments were performed as described above for Example 1, using the ISFET system 600.

[0082]FIG. 12 shows the results of both positive and negative control experiments. As indicated, the integrated potassium-sensitive chip can detect the presence of the specific bacterial strain E.coli K12 using the Polymyxin B antibiotic (PMB). As shown, the output increases as a result of the efflux of potassium ions from cells in the positive control test, as compared to the negative control.

[0083]FIGS. 13A-13C illustrate applications for ISFET-based bacteria sensors, in ...

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Abstract

Disclosed are methods and systems for the detection of bacteria in a sample. The methods comprises contacting the sample with an antibacterial agent and a bacteria identification sensor, and involves the permeabilization of the bacteria by the antibacterial agent, and the subsequent detection of an efflux of potassium ions using a bacteria identification sensor comprising a potassium-sensitive ISFET. Also disclosed are bacteria identification sensor comprising a potassium-sensitive ISFET useful in the practice of the disclosed methods.

Description

RELATED APPLICATIONS[0001]This application claims priority to provisional Application No. 61 / 729,411 having a filing date of Nov. 22, 2012, which is incorporated herein by reference in its entirety.[0002]This application also incorporates herein by reference in their entirety the following applications: Provisional Application No. 61 / 878,021, filed on Sep. 15, 2013 and Provisional Application No. 61 / 749,368, filed on Jan. 6, 2013.FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0003][Not Applicable]MICROFICHE / COPYRIGHT REFERENCE[0004][Not Applicable]BACKGROUND OF THE INVENTION[0005]There is increasing demand for systems that detect bacteria with good selectivity and sensitivity, in applications ranging from medical diagnosis to water and food inspection. Traditional culturing methods take several hours to days to give results. They require trained personnel to perform the tests as well as expensive laboratory equipment. Techniques using DNA amplification and detection, such as those empl...

Claims

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Application Information

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IPC IPC(8): G01N27/414
CPCG01N27/4145C12Q1/02C12Q1/70
Inventor GULAK, GLENNNIKKHOO, NASIMMAXWELL, KAREN
Owner GULAK GLENN
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