Related Experiment Video

Updated: Jan 26, 2026

Detection of Foodborne Bacterial Pathogens from Individual Filth Flies
12:54

Detection of Foodborne Bacterial Pathogens from Individual Filth Flies

Published on: February 13, 2015

18.9K

Multiplex touchdown PCR assay to enhance specificity and sensitivity for concurrent detection of four foodborne

P Moezi1, M Kargar1, A Doosti2

  • 1Department of Microbiology, Jahrom Branch, Islamic Azad University, Jahrom, Iran.

Journal of Applied Microbiology
|April 20, 2019
PubMed
Abstract

Insights

A new multiplex touchdown PCR (TD-PCR) method rapidly detects four major foodborne pathogens simultaneously. This cost-effective technique enhances specificity and sensitivity for pathogen detection in food samples.

Area of Science:

  • Molecular Biology
  • Food Microbiology
  • Biotechnology

Background:

  • Foodborne pathogens pose significant public health risks.
  • Traditional detection methods are often time-consuming and lack sensitivity.
  • Multiplex PCR allows simultaneous detection of multiple targets, but specificity can be an issue.

Purpose of the Study:

  • To develop a multiplex touchdown PCR (TD-PCR) assay for rapid, simultaneous detection of four key foodborne pathogens.
  • To enhance specificity and sensitivity in gene amplification, minimizing mispriming and unwanted products.
  • To provide a cost-effective and time-saving alternative for pathogen detection.

Main Methods:

  • Development of a multiplex TD-PCR assay incorporating a pre-enrichment step.
  • Testing the assay on pure cultures and artificially contaminated raw milk samples.
  • Comparison of multiplex TD-PCR results with traditional culture methods.

Main Results:

  • The multiplex TD-PCR assay effectively detected Escherichia coli O157:H7, Listeria monocytogenes, Staphylococcus aureus, and Salmonella Enteritidis.
  • Unwanted bands were significantly reduced or eliminated.
  • Detection sensitivity was as low as one cell/ml in pure culture and one cell/25 ml in raw milk.
  • Results closely matched traditional culture methods.

Conclusions:

  • The multiplex TD-PCR method is an effective tool for optimizing PCR reactions, increasing specificity and sensitivity.
  • The assay offers a simple, cost-effective, and time-saving solution for rapid foodborne pathogen detection.
  • This method is suitable for routine application in food safety testing.
Keywords:
Listeria monocytogenesSalmonella entericaStaphylococcus aureusEscherichia coli O157: H7multiplex touchdown PCRraw milk

More Related Videos

Development of an Electrochemical DNA Biosensor to Detect a Foodborne Pathogen17:16

Development of an Electrochemical DNA Biosensor to Detect a Foodborne Pathogen

Published on: June 3, 2018

14.1K
Modified Most Probable Number Assay to Quantify Salmonella in Raw and Ready-to-Cook Chicken Products08:19

Modified Most Probable Number Assay to Quantify Salmonella in Raw and Ready-to-Cook Chicken Products

Published on: January 31, 2025

960

Related Concept Videos

Sensitivity, Specificity, and Predicted Value01:13

Sensitivity, Specificity, and Predicted Value

In healthcare diagnostics, laboratory tests play a crucial role in identifying and diagnosing a wide range of medical conditions. However, interpreting test results is not always straightforward. An abnormal test result does not always confirm the presence of a disease, just as a normal result does not guarantee its absence. To assess the reliability of these diagnostic tools, healthcare practitioners rely on two key statistical indicators: sensitivity and specificity.
Sensitivity is the...
1.2K
PCR01:32

PCR

Overview
237.2K
Self-Evaluation: Self-Enhancement and Self-Verification03:00

Self-Evaluation: Self-Enhancement and Self-Verification

Social psychologists have documented that feeling good about ourselves and maintaining positive self-esteem is a powerful motivator of human behavior (Tavris & Aronson, 2008). In the United States, members of the predominant culture typically think very highly of themselves and view themselves as good people who are above average on many desirable traits (Ehrlinger, Gilovich, & Ross, 2005). Often, our behavior, attitudes, and beliefs are affected when we experience a threat to our...
5.8K
Bioavailability Enhancement: Drug Solubility Enhancement01:16

Bioavailability Enhancement: Drug Solubility Enhancement

Body:Bioavailability is a critical factor in determining a drug's effectiveness. It refers to the proportion of a drug that enters the circulation when introduced into the body and is, as a result, able to have an active effect. Enhancing bioavailability is essential for drugs with poor solubility, as it can significantly impact their therapeutic efficacy. Various methods are employed to increase the solubility of drugs, thereby enhancing their bioavailability.Micronization and nanonization are...
250
Bioavailability Enhancement: Drug Permeability Enhancement01:27

Bioavailability Enhancement: Drug Permeability Enhancement

Body:After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt...
195
Defenses Against Pathogens and Herbivores02:26

Defenses Against Pathogens and Herbivores

Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
29.5K