Wyatt Technology

DynaPro NanoStar

DynaPro NanoStar

 

More than just another dynamic light scattering instrument.

The DynaPro NanoStar is a unique cuvette-based DLS instrument used for the analysis of proteins, promiscuous inhibitors, micelles, quantum dots, liposomes, metallic nanoparticles and more. To accommodate scarce and precious samples, specially designed quartz cuvettes afford robust, accurate measurements with as little as 1 µL of solution, while our proprietary disposable cuvettes provide comparable sensitivity with as little as 4 µL!

Included with each NanoStar is a copy of DYNAMICS, our powerful software package for analyzing batch dynamic light scattering measurements.

  • Coupled with the versatile and user-friendly DYNAMICS software, the NanoStar may be utilized to measure not just size, size distributions, and weight-average molar mass, but also solution properties relevant to sample stability: the second virial coefficient (A2 or B22), the diffusion interaction parameter (kD or D1, closely related to the second virial coefficient), and the temperature of protein melting or aggregation onset (TM, Tonset).

    Cuvette, and yet...

    ... still another feature unique to the NanoStar: the optical fiber pickup may be coupled to any of Wyatt's on-line MALS detectors - the DAWN HELEOS II or miniDAWN TREOS - to add on-line DLS measurements in the same detection volume as SEC-MALS or FFF-MALS measurements. 

    Combining numerous benefits, the NanoStar is an unparalleled cuvette-based DLS detector. For higher productivity, consider the DynaPro Plate Reader II, the only commercially available DLS plate reader measuring in situ for high-throughput screening of thousands of conditions per day in industry-standard microwell plates.

    Key Features

    • Rh from 0.18 nm - 2500 nm
    • Temperature from -15°C to +150°C
    • Molecular weight from 300 Da to 1 MDa
    • Separate, optimized SLS and DLS detection channels
    • Auto-attenuation over five orders of magnitude

    Versatile, High-Quality Options

    Make measurements in super-high-quality quartz cuvettes with as little as 1.25 µL of sample, aqueous or organic solvents, over the entire, extended temperature range. This cuvette incorporates a solvent reservoir to prevent sample evaporation over high-temperature or extended analyses.

    Our proprietary disposable cuvettes nearly match the optical quality of quartz yet require only 4 µL of sample, aqueous or select polar solvents. For convenience, larger-volume quartz and disposable cuvettes are also available.

  • On-Line MALS and DLS in a Shared Flow Cell

    Simultaneous determination of molar mass and size is crucial for structural and conformational analysis of macromolecules (e.g., branching ratio of polymers, discriminating empty or filled vesicles, etc.). For smaller molecules such as proteins, MALS cannot measure size directly via the angular dependence and so DLS is an important complementary technique.

    On-Line DLS is a valuable addition to your SEC-MALS or FFF-MALS characterization instrumentation, providing hydrodynamic radii and, in combination with MALS, the shape factor rg:Rh of larger nanoparticles. Instead of adding another detector in-line, with the associated band broadening, dilution, signal misalignment and loss of resolution, Wyatt's innovative solution is to share the MALS laser and flow cell with the DLS detector.

    A NanoStar can be coupled to a MALS flow cell by means of a fiber coupling accessory. The ASTRA chromatography software connects to the MALS and DLS detectors to acquire data simultaneously from both, analyzing and reporting the individual information (molecular weight, rms radius, hydrodynamic radius) and results derived from the combination, such as molecular configuration by shape factor.

  • DLS Technology

    Commercially available DLS instruments generally incorporate an avalanche photodiode (APD) as a single photon counting module (SPCM). APD-based SPCMs are excellent and robust for DLS analysis thanks to their rapid, high-gain response; the NanoStar utilizes a temperature-stabilized APD coupled to an advanced double density, multi-tau (DDMT) correlator for analysis of diffusion coefficients, size and size distributions. The DDMT correlator incorporates 512 bins covering time scales of 100 nsec to 1 hour in order to address a huge span of particle sizes - ranging over hydrodynamic radii Rh of 0.18 nm - 2500 nm.

    SLS Technology

    While size is the primary application of DLS, the measurement of molar mass is often of interest as well. The molar mass of macromolecules having a specific conformation (e.g., globular proteins) may be often estimated from the measured Rh. However, this model-based estimation of mass is often incorrect since many molecules of interest do not correspond to these models. In fact, molar mass may be measured directly from first principles by means of static light scattering (SLS).

    Other DLS instruments use the APD count rate for static light scattering, an unsatisfactory solution since the APD response is nonlinear and subject to relatively high noise levels. In addition to the SPCM-based DLS detection channel, the NanoStar incorporates a separate, optimized SLS detection channel featuring a highly linear, low noise photodiode - in fact, the same photodiode used in our on-line multi-angle light scattering (MALS) detectors. This SLS channel guarantees sensitive and accurate molar masses from 300 Da to ~10 MDa (the upper limit depends on the molecular conformation, and the maximum accurate size may be estimated from the measured Rh).

    And More Unique Technology

    In order to insure that the NanoStar never goes out of range, it comes equipped with automatic attenuation over five orders of magnitude. Its air-launched laser, coupled with proprietary optics for maximum sensitivity, make single-mode optical fiber technology obsolete. The temperature control system in the NanoStar is unequalled in comparable dynamic light scattering detectors, providing rapid temperature ramps with an overall temperature range of -15°C to +150°C.

  • 1 µL Quartz Cuvette - For the smallest possible sample volume and largest range of solvents and temperatures, yet maintaining exquisite sensitivity.

    45 µL Quartz Cuvette - For an optimal trade-off between sample volume and convenience in cuvette filling and washing.

    4 µL Disposable Cuvette - Tiny sample volumes and high sensitivity with the best temperature and solvent performance of polymer-based cuvettes.

  • DYNAMICS 7, software

    DYNAMICS - Automates well-plate scans, temperature ramps, etc. and analyzes DLS data to determine size distributions, temperature onset of melting or aggregation, and the diffusion interaction parameter kD.

  • Size Range (Radius) 0.2 to 2500 nm
    Static Scattering Molecular Weight Range 300 Da to 1 MDa (sample dependent - maximum molecular radius ~ 12 nm)
    Minimum Concentration (lysozyme) * 0.1 mg/mL
    Optics  
    Laser Properties  
       Laser Wavelength 658 nm; 785 nm optional
       Laser Power Control Programmable 10% - 100%
    Scattering Angle Detected 90°
    Sample Cell Options 1.25 µL quartz cuvette
    4 µL disposable cyclic olefin copolymer (COC) cuvette
    standard 1 cm cuvettes with adapter
    Temperature Range -15°C to +150°C
    Dry air or nitrogen required for operation below 20°C
    Data Acquisition Time 1 to 3600 s
    Electronics  
       Optical Fiber Multi-Mode
       Correlator 512 channels, multi-tau, 100 nsec sampling time
       PC ports Ethernet connectivity
    Dimensions 60 cm (L) x 36 cm (W) x 18 cm (H)
    Weight 13.5 kg (29.8 lbs)

    * 14 kDa Lysozyme, PBS, 100 seconds data acquisition.

    Absolute accuracy of ± 0.3°C.


    Facilities requirements may be found in Wyatt Instrument Facilities Specifications.
    Host PC requirements may be found in Computer Requirements.

    Specifications subject to change without notice.

   

For essential macromolecular and nanoparticle characterization—The Solution is Light™

13 Key Questions to Ask

ultimate-guide

Get the inside scoop on buying a Multi-Angle Light Scattering (MALS) or Dynamic Light Scattering (DLS) instrument!

Request the Ultimate Guide today.
Get Ultimate Guide

 

ISO Certification

iso-certification

  ISO 9001:2008

   

 

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.



© Wyatt Technology Corporation. All rights reserved.