Brookhaven - NanoBrook 173 Particle Size Analyzer

NanoBrook 173

173 l 140x140

Protein Sizer

Features at a glance

Rapid and accurate protein and nanoparticle size distributions

Multimodal & unimodal size distribution software

ISO 13321 and ISO 22412 compliant results

Range > 0.3 nm to 10 µm

Customizable reports

Ideal for fast, routine sizing applications in research or quality control

High power 35 mW diode laser

Dynamic light scattering at 173° only

Temperature control, -5 °C to 110 °C

Compact bench top unit, USB connection

Brookhaven's NanoBrook 173 instrument is the go-to-solution for characterization of proteins, antibodies, nanoparticles, macromolecular assemblies and other molecules/particles of small sizes.  The NanoBrook 173 uses backscattering detection for the highest sensitivity and accuracy optimized for molecules and particles less than a few tens of nanometers.

Reliable, Accurate, and Accurate Analysis

The new NanoBrook 173 protein and particle size analyzer incorporates all you need for fast, routine, sub-micron measurements. Based on the principles of Dynamic Light Scattering (DLS) for particle sizing and distribution, most measurements only take a minute or two.


Dilute suspensions, on the order of 0.0001 to 1.0% v/v are prepared, using suitable wetting and/or dispersing agents, if required. A small ultrasonicator is sometimes useful in breaking up loosely-held agglomerates. Sample volumes as small as 50 µL are used. Sample is recoverable. Disposable, polystyrene U-shaped cells are used for aqueous and simple alcohol suspensions. Just a few minutes are required for the sample and cell to equilibrate with the actively controlled temperature environment inside the NanoBrook 173.

nb173 dls graph

Speed and low concentration/small size capabilities

The NanoBrook 173 utilizes backscattering to size the proteins/particles by accumulating the correlation function. The smoother the function, the better the results are. For small molecules, the scattered intensity is typically low. The measurement takes longer to get enough statistics from the photons counted to aquire a good results. The backscattering angle makes for a larger scattering volume, measuring more proteins/particles for a quick measurement of their sizes. The advantage of the backscattering is clear for sizes below 10 nm.

Data Presentation

The NanoBrook 173 protein and particle size analyzer offers many choices for data analysis. One choice is the lognormal distribution by: intensity, volume, surface and number. Another choice, the full size distribution (MSD) can be displayed by the same four weighting factors. In the example above, the MSD is presented by volume for lysozyme. The size distribution and cumulative distribution are shown in the table on the right. Lysozyme has a very low polydispersity in this case.

Sample Type: Most globular proteins, nanoparticles, and small polymers in any non-absorbing liquid

Size Range: > 0.3 nm to 10 µm diameter, depending on refractive index and concentration

Sample Cells: 50 µL disposable, 1 to 3 mL disposable plastic, glass or quartz cells

Concentration Range: 0.1 ppm to 50 mg/mL, depending on refractive index and concentration

Signal Processing: Dynamic Light Scattering, DLS

Correlator: Brookhaven's TurboCorr, multitau research grade with 510 hardware channels, covering the equivalent of 1010 linearly-spaced channels, 100% efficiency, real-time operation over the entire delay-time range

Precision: ± 1% typically 

Temperature Control: -5 °C to 110 °C, ± 0.1 °C, active control. No external circulator required.

Condensation Control: Purge facility using dry air, nitrogen preferred

Standard Laser: 35 mW red diode laser, nominal 640 nm wavelength

Scattering Angle: 173°

Data Presentation: Average & width, lognormal fit, and multimodal size distribution standard

Compliance: ISO 13321 and ISO 22412 compliant results

Power Requirements: 100/115/220/240 VAC, 50/60 Hz, 150 Watts

Dimensions: 23.3 x 42.7 x 48.1 (HWD)

Weight: 15 kg

Environmental Characterisitics: Temperature 10 °C to 75 °C, Humidity 0% to 95%, non-condensing

CE Certificate: Class I laser product, EN 60825-1:2001 CDRH


BI-SFS: Sample filtration system provides and convenient way to clean our light scattering samples, a necessity for samples smaller than 20 nm. Utilizing Teflon tubing and nonreactive components, the BI-SFS is compatible with most smaple filtration needs provided there is at least 5 mL of liquid. For protein and other rare samples, use 20 nm BI-DF20AQ Anatop filters instead.

BI-IQOQPQ: Qualification for installation, operation and performance.



BI-SCP: Box of 100 plastic cells with caps, 2.2 to 4.5 mL volume. Use with water.

BI-SM50: Box of 80 plastic cells, disposable, 50 µL volume, sample retrievable, requires BI-SM50A. Use with water

BI-SM50A: One sample cell adaptor for use with BI-SM50.

Reference Materials

BI-LTX92: Latex reference material for validation of sizing, 15 mL, 92 ± 3 nm

BI-SVK92: Starters validation kit for sizing, 2 mL, 92 ± 3 nm

BI-CC: Nitrogein-purge facility for condensation control

Note: current users of the 173 may upgrade to include zeta potential and other angles for particle sizing provided their instrument has the necessary mechanics, optics and hardware. Contact the factory for more information.

Proteins, IgG, peptides, RNA/DNA


Polymer latexes

Pharmaceutical preparations

Micelles, Liposomes, Exosomes

Oil/Water and Water/Oil emulsions

Paints and pigments



Pigments, inks and toners

Cosmetic Formulations

Liposomes and biocolloids

Emulsions (foodstuffs, cosmetics)

Carbon blacks

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