Food Sample Enrichment
Food Sample Enrichment - Related Videos
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Enrichment and Detection of Clostridium perfringens Toxinotypes in Retail Food Samples
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Cited by 7 •
2019
The objective of this protocol is to detect different Clostridium perfringens toxinotypes in locally purchased foods, particularly epsilon toxin producing strain types B and D, without the use of anaerobic chambers.
06:12
Quasi-metagenomic Analysis of Salmonella from Food and Environmental Samples
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Cited by 12 •
2018
Here, we present a protocol to prepare DNA samples from food and environmental microbiomes for concerted detection and subtyping of Salmonella through quasimetagenomic sequencing. The combined use of culture enrichment, immunomagnetic separation (IMS), and multiple displacement amplification (MDA) allows effective concentration of Salmonella genomic DNA from food and environmental...
03:25
Amoeba-Based Enrichment of Giant Viruses from an Environmental Water Sample
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2026
Source: Bou Khalil, J. Y.,et al. A Rapid Strategy for the Isolation of New Faustoviruses from Environmental Samples Using Vermamoeba vermiformis. J. Vis. Exp. (2016)This video demonstrates the enrichment of giant viruses from an environmental water sample using amoeba-based co-culture to enable downstream detection and analysis.
10:44
Generating Whole Bacterial Genomes from Clinical Samples using a Target Enrichment Workflow
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Cited by 1 •
2025
Here, we present a protocol to enable whole-genome sequencing of bacterial sexually transmitted infections from clinical samples using target enrichment. This novel, syndromic panel-based method overcomes challenges of abundant human DNA and low bacterial loads, facilitating genomic surveillance for Chlamydia trachomatis, Neisseria gonorrhoeae, Treponema pallidum, and Mycoplasma genitalium.
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Creating a Winogradsky Column: A Method to Enrich the Microbial Species in a Sediment Sample
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2023
Source: Elizabeth Suter1, Christopher Corbo1, Jonathan Blaize1 1 Department of Biological Sciences, Wagner College, 1 Campus Road, Staten Island NY, 10301 The Winogradsky column is a miniature, enclosed ecosystem used for enriching sediment microbial communities, especially those involved in sulfur cycling. The column was first used by Sergei Winogradsky in the 1880s and has since been applied in the study of many diverse microorganisms involved in biogeochemistry, such as photosynthesizers,...
FAQs
The medium and incubation environment are chosen to favor the target organism rather than the entire microbial community. Selective ingredients can inhibit competing microbes, while environmental conditions support target growth. This differential response raises the target’s relative representation in the sample, making later detection or identification more likely when background organisms would otherwise interfere.
Recovery of stressed cells is a central reason to use this approach. A target organism may be present at low abundance or in a stressed state, making direct detection difficult. Enrichment gives those cells an opportunity to increase in number under supportive conditions, producing a preparation better suited to subsequent testing than the original sample.
Food sample enrichment does not by itself provide the final identification. Instead, it prepares the sample for culture, biochemical, or molecular analysis. The selected downstream method determines whether the outcome is growth-based, biochemical, or molecular evidence. Enrichment therefore functions as a sensitivity-improving stage before analysis rather than replacing the methods that follow.
Outcome depends on matching the enrichment conditions to the target organism. If the medium or incubation environment does not support that organism, increasing the sample volume alone would not solve the detection problem. Conversely, selective ingredients or restrictive conditions can reduce competing microbes. Careful condition selection is therefore essential for recovering the intended target.
A basic workflow starts by transferring the food sample into a liquid enrichment medium. The inoculated medium is then incubated under conditions selected for the target organism. After enrichment, the preparation proceeds to an appropriate culture, biochemical, or molecular analysis. Each stage has a distinct role: introduction, target recovery, and evidence generation.
Key inputs are the food matrix, a liquid enrichment medium, and defined incubation conditions. The medium supplies the growth context, while selective ingredients may limit competing microbes. Because the target organism determines the desired conditions, these choices should be treated as an integrated preparation rather than isolated steps. This alignment supports consistent recovery before downstream testing.
In food safety monitoring, enrichment improves the sensitivity and reliability of testing for microbial contamination. It is especially useful when a potentially important organism is present at low abundance or has been stressed and may escape direct detection. The enriched preparation can then support culture, biochemical, or molecular analysis, helping investigators assess microbial hazards in food samples.
An enriched sample is best viewed as material prepared for further analysis, not as a complete identification result. Evidence from culture, biochemical testing, or molecular analysis must provide the subsequent information about the target organism. This distinction helps interpret enrichment correctly: it increases the usefulness of the sample for testing, but does not substitute for the analytical method that follows.