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The dual capability Zetasizer µV is dedicated to the measurement of proteins, and uses dynamic light scattering (DLS) to measure size, and static light scattering (SLS) to measure molecular weight.

Overview

The Zetasizer µV is a highly sensitive dual function light scattering detector. It can be used as a RALS detector with any GPC/SEC system, including Viscotek, to give absolute size (by DLS) and absolute molecular weight (by SLS). Alternatively, in cuvette mode, it is suitable for the detection of aggregates and for monitoring aggregate formation using DLS. The Zetasizer µV can be connected to any GPC/SEC system and concentration detector using an 8µl quartz flow cell and standard chromatography tubing.  This allows the measurement of absolute size, absolute molecular weight, aggregation, and conjugation (when used with a second concentration detector).

In cuvette mode, batch measurements of particle and molecular size (by DLS) can be made by simply removing the flow cell from the unit and inserting a standard cuvette containing the sample.

  • Switch in seconds from chromatography detector to cuvette mode.
  • Accurate and repeatable results using precise temperature control.
  • Sensitivity – 0.1mg/mL 15kDa protein (Lysozyme).
  • Only 2µL sample required in cuvette mode to preserve sample.
  • 8µL flow cell for chromatography mode ensures minimal band broadening to preserve the resolution of the separation.
  • Connect to any Viscotek system for full software integration and truly automated operation
  • Connect to any third party SEC system using OmniSEC software and OmniFACE interface.
  • Automated temperature trends for aggregation temperature determination.

How it works

The Zetasizer µV incorporates two techniques that can be used in both chromatography detector mode and cuvette mode.
Dynamic Light Scattering is used to measure particle and molecule size. This technique measures the diffusion of protein molecules moving under Brownian motion, and converts this to size and a size distribution using the Stokes-Einstein relationship.

Static Light Scattering is used to determine molecular weight. When used as a SEC detector, the light scattering intensity in combination with the signal from a concentration detector enables the absolute molecular weight to be calculated. In cuvette mode, measurements from a few different concentrations are combined to draw a Debye plot. From this a molecular weight and second virial coefficient can be calculated.

Specification

Measurement type 1

Measurement type:
Particle size, molecular size.
Measurement range:
0.15nm – 1.0 microns* (radius)
Measurement principle:
Dynamic Light Scattering
Measurement angle:
90°
Minimum sample volume:
2µL
Accuracy:
Better than +/-2% on NIST traceable latex standards
Precision / Repeatability:
Better than +/-2% on NIST traceable latex standards

Measurement type 2

Measurement type:
Molecular weight as SEC detector
Measurement range:
<1kDa – 5MDa
Measurement principle:
Static Light Scattering
Accuracy:
+/- 5% typical
Flow cell volume:
8µl

Measurement type 3

Measurement type:
Molecular weight as batch detector
Measurement range:
<1kDa – 5MDa
Measurement principle:
Static Light Scattering using Debye plot
Minimum sample volume:
2µL (3-5 sample concentrations required)
Accuracy:
+/- 10% typical

General

Temperature control range:
2°C - 90°C +/-0.1.**
Light source:
Laser 830nm, Max 60mW
Laser safety:
Class 1
Power:
100VA

Weight and dimensions

Dimensions (W, D, H):
350mm x 410mm x 170mm
Weight:
14kg

Operating environment

Operating temperature (°C):
15°C – 40°C
Humidity:
35% - 80% non-condensing

Zetasizer µV

*:
Maximum range, sample dependent.
**:
At 25°C

Accessories

Cell and cuvette options

Quartz flow cell (ZMV1008) Add flow capability for size measurements to the Zetasizer. Measure size and intensity with MPT-2 autotitrator. Connect to an SEC system for use as a DLS detector, to measure protein size and molecular weight. Low 8µL internal volume.
Low-volume quartz batch cuvette (ZMV1002) Low-volume quartz batch cuvette for size and molecular weight measurements. Compatible with aqueous and non-aqueous solvents and dispersants. Absolute size measurement. Measure molecular weight and second virial coefficient. Minimum sample volume 2 microliters.
Quartz batch cuvette (ZMV1012) Quartz cuvette for batch measurements. Compatible with aqueous and non-aqueous solvents and dispersants. Absolute size measurement. Measure molecular weight and second virial coefficient. Minimum sample volume 12 microliters.
12mm Square Polystyrene Cuvettes (DTS0012) Disposable polystyrene cuvettes. 100 disposable cells complete with 100 stoppers to avoid cross contamination. For size measurements using aqueous dispersants. Compatible with zeta potential measurements using the dip cell. Visit store to buy now
 
 

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Metal colloids - their preparation, application and characterization Webinar - Recorded (English)

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Size: What is the z-average? FAQ

The z-average diameter is the mean intensity diameter i.e. it is a diameter based upon the intensity of scattered light of a material in its native state (including electrical double layers and surface structure). The z-average is derived from a Cumulants analysis of the measured correlation curve, wherein a single particle size is assumed and a single exponential fit is applied to the autocorrelation function. It is unique to dynamic light scattering and it is sensitive to the presence of aggregates/dust due to the intensity of light scattered by any larger particles present.



Comparison of Statistical Measures Reported by NTA and DLS Techniques Technical Note (English)

As the Nanoparticle Tracking Analysis (NTA) technique has gained in popularity in recent years, comparison to Dynamic Light Scattering (DLS) results has become more frequent. When comparing results, it is important to understand the differences betwe...



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How can I trust my data? Is it affected in any way by the measurement technology, or  by the user through sample preparation or the analysis parameters employed? Independent and orthogonal measurement modalities should be used to provide measurement ...


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