Delsa Nano Zeta Potential and
Submicron Particle Size Analyzer
Comparison of Nanofilters
with Ultraporous Filters
Applications of Nanofilters in
Viral and Bacterial Filtration
Determination of Surface
Potentials of Different Materials Used in Filters
Coulter, Inc. is a leading manufacturer of biomedical testing instrument
systems, tests and supplies that simplify and automate laboratory processes.
Spanning the biomedical testing continuum - from pioneering medical research and
clinical trials to laboratory diagnostics and point-of-care testing - Beckman
Coulter's 200,000 installed systems provide essential biomedical information
to enhance health care around the world
Delsa Nano Zeta Potential and Submicron Particle Size Analyzer
The DelsaNano series is a new generation of instruments that use
photon correlation spectroscopy (PCS), which determines particle size by
measuring the rate of fluctuations in laser light intensity scattered by
particles as they diffuse through a fluid, for size analysis measurements and/or
electrophoretic light scattering (ELS), which determines electrophoretic
movement of charged particles under an applied electric field from the Doppler
shift of scattered light, for zeta potential determination.
This series has a broad range of capabilities, including conventional static
and automatic titration measurements for both size and zeta potential
distributions of suspended particles in a wide range of size and concentration.
The DelsaNano also can measure zeta potential of a solid surface
Comparison of Nanofilters with Ultraporous Filters
Recent progress in nanotechnology has enabled the development of a filter
material capable of removing viruses and bacteria more efficiently than
conventional ultraporous filters, and capable of maintaining a high filtration
Applications of Nanofilters in Viral and Bacterial Filtration
Applications of this filter include: 1. Selective filtration of mixed aqueous
solutions 2. Removal of microorganisms (from drinking water and other drinks,
blood serum, biologics, etc.) 3. Filtration of DNA, RNA, endotoxins, etc. 4.
Separation and extraction of nucleic acids and proteins.
Determination of Surface Potentials of Different Materials Used in Filters
In this study, the flat surface cell of Beckman Coulter
DelsaNano C was used to determine surface zeta potentials of filters (A, B,
C, D) made of different materials before and after filtration of organic matter
to obtain purified water. The surface zeta
potential of filters before and after the filtration are shown in Fig. 1.
Although it depended on the material, the surface zeta
potentials of the filters before use were about -60 to -120 mV. The surface
zeta potentials of the respective filters after filtration of organic matter
were about -40 mV. This value (-40 mV) is believed to be the zeta
potential of the organic matter. This study shows that surface zeta
potential determination using the flat surface cell can be applicable to the
evaluation of functional membranes.
Figure 1. Surface zeta potentials before and after
Source: Beckman Coulter
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