Wet Foam Elution™ (WFE™)

Rapid Sample Recovery and Concentration Technology for Complex Sample Workflows

Wet Foam Elution™ is InnovaPrep’s patented sample recovery and concentration technology designed to rapidly transform complex air and fluid samples into analysis-ready concentrates for downstream analytical workflows.

InnovaPrep’s proprietary Wet Foam Elution™ (WFE) technology is a core innovation that enables rapid, high-efficiency recovery of biological and other target particles from air and liquid samples after capture on filtration media.

 

Designed to address the challenges of dilute samples, complex matrices, and low-abundance targets, WFE transforms traditional sample preparation into a fast, reproducible, and highly efficient concentration step that supports a wide range of analytical workflows.

 

Whether used in environmental monitoring, food safety, biodefense, or laboratory research, WFE enables consistent and reliable recovery of target particles—supporting higher sensitivity and faster time-to-result.

Why Wet Foam Elution Matters

Wet Foam Elution is integral to InnovaPrep’s AirPrep™ and FluidPrep™ platforms, enabling rapid concentration of microorganisms, cells, and particles from large-volume air or liquid samples in minutes.

Compared to conventional sample preparation methods, WFE significantly reduces processing time and improves recovery efficiency versus approaches such as:

  • Culture enrichment
  • Polymer precipitation (e.g., PEG-based methods)
  • Ultracentrifugation
  • Ultrafiltration

The result is a concentrated, downstream-ready sample that preserves target integrity while minimizing handling complexity.

How Wet Foam Elution Works

WFE utilizes a carefully engineered elution system composed of a buffered solution, a mild surfactant, and dissolved gas, packaged in a controlled delivery format.

During elution, a small volume of buffer rapidly expands into a structured, viscous foam. This transient foam phase enhances contact with the filtration matrix and efficiently dislodges captured particles.

As the foam collapses within seconds, it transitions back into a liquid concentrate that is immediately suitable for downstream analysis.

This unique foam-mediated process enables concentration factors of up to 10,000×, depending on sample type and workflow conditions.

 

Mechanisms Behind High Recovery Performance

The performance of WFE is driven by a combination of physical and chemical mechanisms:

  • Controlled Volume Expansion – Rapid expansion increases contact with the filter surface
  • Increased Viscosity Phase – Reduces channeling and promotes uniform interaction
  • Microbubble Dynamics – Foam structures act as deformable interfaces that mobilize trapped particles
  • Mechanical Disruption – Flow and turbulence assist in releasing adherent material
  • Surfactant Action – Breaks particle-surface interactions and improves elution efficiency

Together, these mechanisms enable efficient recovery of diverse particle types while maintaining sample integrity.

Our FluidPrep™ and AirPrep™ Products utilize WFE to dramatically reduce the time-to-result and improve sample recovery.

Key Benefits of WFE-Based Workflows

High Recovery Efficiency

Maximizes retrieval of microorganisms, cells, viruses, and particles from complex matrices, improving downstream analytical sensitivity.

Rapid Sample Preparation

Reduces elution and concentration steps from hours to seconds, enabling same-shift or same-day workflows.

Broad Sample Compatibility

Supports a wide range of sample types, including environmental water, wastewater, air samples, clinical matrices, and food systems.

Gentle Processing

Preserves viability and structural integrity of cells and biological particles for culture-based and functional assays.

Workflow Simplicity

Designed for easy integration into laboratory and field workflows with minimal training requirements.

Downstream Analytical Workflow Compatible

Wet Foam Elution produces a concentrated sample that is immediately compatible with a wide range of analytical applications.:

  • Molecular Analysis
    PCR, qPCR, ddPCR, sequencing, metagenomics
  • Cellular & Particle Analysis
    Flow cytometry, extracellular vesicle (EV) and exosome workflows, cell isolation, and viability-based assays
  • Environmental Monitoring & Surveillance
    Wastewater-based epidemiology, eDNA analysis, aerosol monitoring, and environmental microbiology
  • Biopharma & Diagnostic Research
    Biomarker discovery, therapeutic development workflows, and analytical sample preparation
  • Advanced Analytical Applications
    Proteomics, metabolomics, microscopy, and infectivity assays

Elution Buffer Selection

Optimized elution buffers are critical to maximizing performance and ensuring compatibility with downstream applications. InnovaPrep buffers are specifically formulated for use with AirPrep™ and FluidPrep™ systems to support consistent Wet Foam Elution performance.

Select the appropriate buffer based on your application:

  • PBS-Tween
    Broad-use buffer suitable for culture-based workflows and general downstream analysis. pH typically 5.4–6.65.
  • Tris-Tween
    Optimized for rapid molecular workflows such as nucleic acid analysis. pH typically 5.75–7.0.
  • PBS-X
    Designed for viability-focused applications, including infectivity studies, exosome workflows, and cell isolation.
  • DMEM (Tween-free)
    Optimized for sensitive applications involving enveloped viruses and delicate biological targets.
     

Integrated Workflow Platform Advantage

When combined with InnovaPrep’s AirPrep™ and FluidPrep™ systems, Wet Foam Elution provides a fully integrated approach to sample collection, concentration, and preparation—reducing time-to-result while improving sensitivity and reproducibility across diverse applications.