The PARTICLE METRIX Scanning ZetaView™ can now be equipped with 3 different Cell Assemblies: “Z NTA” is the renamed classical multi-parameter Cell Assembly including electrophoresis zeta potential. The new innovation is the Cell Assembly for potentially contaminating samples, called “X NTA”, in which all analyses are possible with exception of zeta potential. The same capability is offered with the Standard “NTA” Cell Assembly, which can be used with standard non contaminating samples.
Table 1 lists the performance of all three Cell Assemblies.
For the Z-NTA the classic cell arrangement remains unchanged but has a new name “Z-NTA” to differentiate it from the new Cell Assemblies. It has zeta potential capability as usual.
The new cell units consist of a reinforced quartz cell and its colored holder. The blue holder is designated for the standard (Fig. 1) and the red one for the X-NTA Assembly. Both new Cell Assemblies are designed for rapid routine use like concentration and size analysis experiments. Furthermore, fluorescence detection is possible.
The Cell Assemblies are designed against vibration and drift. Valves at both ends are disposable and ensure leaking free operation.
Other functions of the cell assemblies are listed in Table 2.
The following functions of the ZetaView™ instrument are disabled when using NTA and X-NTA Cell Assemblies: Electrophoresis zeta potential, conductivity and automatic rinsing / dosing via the internal pumps.
NTA Cell Assembly from the top
The Standard NTA (shown in Fig. 2) and the X-NTA Cell Assembly suit onto the standard ZetaView™ instrument Model PMX110.
Table 3 lists the materials in direct contact with the sample fluid.
Standard NTA Cell Unit on blue holder X-NTA Cell Unit on red holder (Fig. 3).
Replacement of the Cell Unit
The new quartz Cell Unit of the Standard NTA and X-NTA assembly is reinforced and therefore very robust. The Cell Unit normally stays in the Assembly, even for cleaning. However, the user may remove the Cell Unit from the Cell Assembly by removing one screw, which is done within seconds (Fig. 5).
Simple Cleaning procedure
Before cleaning, rinse with more than 5 mL of buffer or water, by using a syringe. Afterwards flush with water to remove any sample residues. Remove check valve on the injection side. Dilute cleaning detergent (e.g. 1 mL liquid soap in 50 mL) in water. Wet the pipe cleaner with the cleaning liquid. Insert pipe cleaner directly into the injection port WITHOUT check valve (Fig. 6 right). Fill at least 10 mL of clean water to remove the cleaning solution. The Cell Assembly can now be placed back onto the instrument and locked with a click.
Particle Metrix GmbH is a company producing nanoparticle analyzers to measure size, concentration, zeta potential, fluorescence and pattern sub-populations. All instruments are complementary to each other in size and concentration range. Our design focusses on efficient and secure analysis.
Particle Metrix, November 2016