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Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
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A multiplex, bead-based array for profiling plant-derived components in complex food matrixes.

Elena Ponzoni1, Diego Breviario, Alessandro Mautino

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This study introduces a novel DNA-based assay for simultaneously identifying multiple plant ingredients in processed foods. The highly sensitive and reproducible method enhances food authentication and ingredient analysis in complex mixtures.

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Area of Science:

  • Food Science
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Consumer demand for authentic processed food ingredients is rising.
  • Current DNA-based methods often lack the multiplexing capacity for complex food matrices.
  • Developing
  • all-in-one
  • assays is crucial for efficient food analysis.

Purpose of the Study:

  • To develop a multiplex DNA-based assay for the simultaneous detection of five different plant components.
  • To apply Multi-Analyte Profile (xMAP™) technology for enhanced food ingredient authentication.
  • To establish a sensitive and reproducible method for analyzing complex food and feed samples.

Main Methods:

  • Utilized oligonucleotide-coupled, bead-based suspension arrays (xMAP™ technology).
  • Targeted species-specific DNA polymorphisms in the first intron of plant β-tubulin genes.
  • Employed a simple workflow involving PCR amplification and direct hybridization assay.

Main Results:

  • Achieved high reproducibility with an absolute detection limit as low as one target DNA copy per species.
  • Demonstrated relative detection limits in complex mixtures from <0.5% (wheat) to 2% (soybean).
  • Successfully determined the analytical composition of 14 food and feed samples with high specificity and sensitivity.

Conclusions:

  • The developed multiplex assay offers a scalable and flexible solution for food ingredient authentication.
  • The high multiplexing capacity (up to 100 analytes) allows for tailored analyses based on specific needs.
  • This method significantly advances the ability to analyze complex processed foods and feeds for multiple plant components.