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Module 4: Microfluidic Integration and Lab-on-Chip Systems

  1. Q1(f). The term μTAS stands for: (i) Micro Thermal Analysis System (ii) Micro Total Analysis System (iii) Micro Tissue Actuation System (iv) Micro Transport and Sensing2025?m

    Module 4: Microfluidic Integration and Lab-on-Chip Systems

    The term μTAS stands for:

    (i) Micro Thermal Analysis System
    (ii) Micro Total Analysis System
    (iii) Micro Tissue Actuation System
    (iv) Micro Transport and Sensing

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    Worked Solution

    Answer: (ii) Micro Total Analysis System

    μTAS stands for Micro Total Analysis System. It integrates several laboratory operations such as sample preparation, mixing, separation, reaction and detection on a miniaturized platform.

  2. Q1(j). A Lab-on-a-Chip integrates: (i) Only sensors (ii) Only actuators (iii) Multiple laboratory functions on a single chip (iv) Only data processing units2025?m

    Module 4: Microfluidic Integration and Lab-on-Chip Systems

    A Lab-on-a-Chip integrates:

    (i) Only sensors
    (ii) Only actuators
    (iii) Multiple laboratory functions on a single chip
    (iv) Only data processing units

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    Worked Solution

    Answer: (iii) Multiple laboratory functions on a single chip

    A Lab-on-a-Chip (LoC) miniaturizes and integrates laboratory operations such as sample preparation, transport, mixing, separation, reaction and detection onto a small chip.

  3. Q6(a). Define Micro Total Analysis Systems (μTAS). Discuss the concept and major applications of Lab-on-Chip (LoC) devices.20257m

    Module 4: Microfluidic Integration and Lab-on-Chip Systems

    Define Micro Total Analysis Systems (μTAS). Discuss the concept and major applications of Lab-on-Chip (LoC) devices.

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    Worked Solution

    μTAS and Lab-on-Chip

    μTAS (Micro Total Analysis System) is a miniaturized analytical system in which several laboratory operations are integrated on a microfluidic platform.

    Concept

    A typical LoC/μTAS can integrate:
    sample introduction → preparation → mixing → reaction → separation → detection → data processing.

    The small channel dimensions reduce sample and reagent volumes and can make analysis rapid and portable.

    Major applications

    1. Point-of-care medical diagnostics.
    2. Blood and cell analysis.
    3. DNA/RNA analysis and PCR-related workflows.
    4. Drug screening and pharmaceutical research.
    5. Environmental and chemical analysis.
    6. Food and pathogen detection.
    7. Personalized and rapid diagnostic testing.

    Advantages

    • Low sample consumption.
    • Fast analysis.
    • Small device size.
    • Potential for automation and portability.
    • Reduced reagent cost.
    • High-throughput parallel processing.
  4. Q6(b). Discuss the various microfluidic strategies used for mixing and separation in LoC platforms.20257m

    Module 4: Microfluidic Integration and Lab-on-Chip Systems

    Discuss the various microfluidic strategies used for mixing and separation in LoC platforms.

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    Worked Solution

    Microfluidic Mixing and Separation Strategies in LoC

    Mixing strategies

    Because microfluidic flow is usually laminar, turbulence is weak. Mixing is therefore achieved using:

    1. Passive mixing: Channel geometry such as serpentine, herringbone, split-and-recombine, T-junction and chaotic advection structures increases interfacial area and diffusion.
    2. Droplet-based mixing: Small droplets provide short diffusion distances and can be transported through channels.
    3. Active mixing: External energy such as acoustic, magnetic, electric or pneumatic actuation disturbs the streams and enhances mixing.

    Separation strategies

    1. Filtration: Microstructures physically retain particles larger than a selected size.
    2. Hydrodynamic separation: Channel geometry and flow conditions separate particles according to size or trajectory.
    3. Dielectrophoresis: Non-uniform electric fields manipulate particles according to electrical properties.
    4. Electrophoresis: Charged particles migrate under an electric field at different rates.
    5. Magnetic separation: Magnetically labeled cells or particles are captured or deflected using magnetic fields.
    6. Centrifugal/inertial methods: Curved or specially shaped channels create forces that alter particle trajectories.

    These methods allow LoC systems to perform automated sample preparation and analysis with very small volumes.

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