Wyatt Technology

Accessories Overview

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On-Line Multi-Angle Light Scattering (MALS)

  • WyattQELS The WyattQELS™ dynamic light scattering (DLS) module integrates inside the DAWN®, miniDAWN® or microDAWN™ MALS instruments to provide simultaneous DLS measurements in the same scattering volume viewed by the MALS detectors. This integration eliminates artifacts due to band broadening or temporal displacement between separate detectors.

    In DAWN, the optical fiber may be located in one of four angular positions, at 50.5°, 90°, 135° or 150°. ASTRA software automatically detects the occupied position.

    The miniDAWN provides a fiber mount at 135° scattering angle and the microDAWN fiber mount is at 130°.


  • There's more than one way to add online dynamic light scattering to a MALS detector. An alternative to the WyattQELS embedded DLS module is coupling the detection module of a DynaPro® NanoStar® or Mobius™ to a MALS flow cell via optical fiber.

    The DLS Compatibility Kit includes the optical fiber and other items needed to make the connection so the DLS batch instruments can do double duty for online DLS.

  • COMET The COMET™ ultrasonic transducer cleans MALS flow cells automatically by agitating the fluid and loosening particles from the glass surfaces.

    The COMET integrates inside the chassis of the MALS detector and is either controlled manually from the instrument's front panel, or automatically via an ASTRA method.

  • SEC Columns Wyatt offers silica-based SEC Columns specifically designed and tested for optimal SEC-MALS measurements of proteins and peptides.

  • WISH Injection Module The Wyatt Injection System, High-Pressure (WISH™) is ideal for manual injections onto an SEC column as it triggers an ASTRA acquisition. Also useful with an Optilab dRI detector for the determination of dn/dc in flowing "batch" mode.

  • microbatch kit The MicroBatch Kit injects unfractionated samples directly into the flow cell of a MALS or RI detector, with the help of a syringe pump or strong thumb. It is often used in dn/dc measurements or to produce Zimm plots.

  • microCUVETTE™

    Batch mode (unfractionated) measurements with the 10 µL quartz microCUVETTE are used to obtain average solution molar masses via 90° static light scattering in a DAWN MALS detector. This accessory is appropriate when molecular radii are below 10 nm and microbatch/flow cell use is not recommended, due to either the larger sample volume required or the potential for fouling.


    Installing a WyattQELS module in the MALS detector adds DLS capabilities for determining average nanoparticle size (hydrodynamic radius) and even size distributions in batch mode, using the microCUVETTE.

  • Orbit The Orbit™ helps conserve mobile phase by programmatically directing the solvent to either a waste bottle or back to the solvent reservoir.

    In a CG-MALS system, the Orbit is used to automatically select wash solvents in the post-experiment cleaning cycle.

  • Inline filters are critical to ensuring particle-free mobile phase and optimal light scattering measurements in SEC-MALS and FFF-MALS. Wyatt offers two type of inline filters for chromatography:

    • Aqueous: PEEK filter housing and titanium frit accomodate 12.5 mm (1/2") diameter filter membranes for use with aqueous solvents. Typical filter membranes are hydrophyllic PVDF.

    • Organic: Stainless steel filter housing and stainless steel filter support screen accomodate 25 mm (1") diameter filter membranes for use with organic solvents. Typical filter membranes are hydrophobic PVDF (useful for most organic solvents but not acetone, DMAc, DMF or DMSO) or PTFE (useful for most organic solvents but not benzene, chloroform, methylene chloride, toluene or xylene)

    Wyatt's inline filters are designed to be placed between the HPLC pump and the injector valve, and are not intended to filter the sample after separation. Post-column filtration can result in loss of sample components, loss of chromatographic resolution and column damage due to backpressure from clogged filters.

    These filters are not intended for use with UHPLC. UHPLC mobile phase should always be prepared to the highest standards of cleanliness in order to prevent clogging columns.


Dynamic Light Scattering (DLS) and Electrophoretic Light Scattering (ELS)

  • 45 ul CUVETTE kit Several specially-designed, high-quality quartz microcuvettes are available for batch measurements of static and dynamic light scattering. These provider higher quality data than disposable cuvettes and are necessary when samples are in non-polar solvents.

    • The MALS microCUVETTE allows static and dynamic light scattering measurements to be made simultaneously in a MALS detector, requiring only 10 µL of solution. Requires a Batch Conversion Kit.

    • The DynaPro NanoStar may be used with a unique 1 µL quartz cuvette that incorporates a solvent moat in order to prevent solvent evaporation from the sample during long measurements or in the course of a temperature ramp.

    • Both the NanoStar and Mobius may utilize a 45 µL quartz cuvette, which is more convenient than the 1 µL cuvette when sufficient sample is available. An adaptor is required in order to utilize this in the Mobius.

  • NanoFilter Kit The NanoFilter Kit makes it easy to filter, recover and refilter precious sample. This is especially useful when your total sample volumes are below 300 µL.

  • Atlas The Atlas pressurizes the Mobius cell to allow mobility measurements of biomolecular samples, including proteins and vesicles, in high-salt buffers.

  • Mobius Dip Cell An alternative to the high-pressure flow cell, the Mobius Dip Cell facilitates rapid manual measurements while requiring only 65 µL of solution under typical conditions.


Field-Flow Fractionation (FFF)

  • Eclipse Channels Eclipse Channels offer a wide selection of separation channels and membranes to accommodate a variety of analytical and even semi-preparative tasks:

    • Short and Long Flat AF4 Channels for optimal tradeoff between sample load, sensitivity and resolution
    • Fritless AF4 Channel to eliminate the focusing step, with concomitant high sample concentration and potential aggregation or fouling. Eclipse AF4 only.
    • Semi-Prep AF4 Channel for separating and collecting milligram quantities. Eclipse AF4 only.
    • Hollow-Fiber HF5 Cartridges for maximum convenience, highest sensitivity and lowest sample load (in the nanogram range for proteins). HF5 cartridges are usually disposed of after ~ 100 injections; replacement is fast and easy. Eclipse DualTec only.

    With flat channels you may select regenerated cellulose or poly ether sulfone (PES) membranes of varying size cutoff values. Membranes of other materials such as PTFE may be cut from sheets. HF5 cartridges are only made of PES with 10 kDa cutoff.

  • Solaris The Orbit helps conserve mobile phase by programmatically directing the solvent to either a waste bottle or back to the solvent reservoir.

  • Solaris Solaris prevents growth of bacteria, fungi or algae in solvents with high efficiency and protects your system from down-time due to contamination.



  • RI Calibration Kit Pre-made RI Calibration Standards are available to speed up RI calibration. Can be used to calibrate any Optilab or third-party differential RI instrument.

  • MicroBatch Kit The MicroBatch Kit is used to inject unfractionated samples directly into the flow cell of a MALS or RI detector. It is often used in dn/dc measurements or to produce Zimm plots.

  • Solaris Solaris prevents growth of bacteria, fungi or algae in solvents with high efficiency and protects your system from down-time due to contamination.



Ultimate Guide

Thirteen key questions to ask when buying a Multi-Angle Light Scattering (MALS) or Dynamic Light Scattering (DLS) instrument.

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Solutions Catalog

Our Solutions Catalog combines Wyatt's product lines, applications and services into a single comprehensive booklet.

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Wyatt Technology is the recognized leader in light scattering instrumentation and software for determining the absolute molar mass, size, charge and interactions of macromolecules and nanoparticles in solution.

Wyatt's line of multi-angle static light scattering products couple to size exclusion chromatography (SEC-MALS), field-flow fractionation (FFF-MALS), and stop-flow composition-gradient systems (CG-MALS). Our dynamic light scattering (DLS) products operate in traditional cuvette as well as on-line and automated, high-throughput modes. We also offer unique instruments for electrophoretic light scattering (MP-PALS), differential refractometry, and differential viscosity.

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