ZETASIZER APS ABSENT OF CROSS-CONTAMINATION.
Setup and operation of the Zetasizer APS is straightforward and its stringent cleaning protocols are designed to ensure that no cross contamination occurs. The work described in the new application note used familiar protein samples to demonstrate the lack of detectable cross-contamination. Samples included insulin, in both monomeric (the insulin hexamer) and oligomeric forms, and Abeta, the amyloid beta peptide known for its stickiness and tendency to adhere to plastic. The Abeta sample was present in two forms, fibrillar and oligomeric.
The order in which samples were loaded onto the system was chosen so as to maximize the risk of cross-contamination. The oligomeric insulin was dispensed first using a standard pipette, followed by the small and pure insulin, and then the larger polydisperse Abeta samples. Since large protein aggregates scatter much more light than small pure protein samples, if cross-contamination were to occur the polydisperse Abeta sample would be detected within the small homogenous protein sample. The results show that after running multiple tests, there was no detectable cross contamination.
The Zetasizer APS delivers the same high sensitivity, high specification DLS measurements as other systems in Malvern's established Zetasizer family. The automated processing of samples in multiwell plates enables the generation of high quality DLS data with no user intervention, a major benefit in maximizing productivity. The system's highly practical data display capability allows easy retrieval of results of interest, eliminating the need to manually scan through all measurements. In addition, the Zetasizer APS plate navigator feature acts as a data mapping tool, for rapid screening of results to retrieve the information of most interest and subsequent in-depth investigation of selected data sets.
The separate temperature controls of the plate holder and the measurement cell allow the Zetasizer APS to maintain the protein samples in optimal condition until measurement. In addition, thermal trend measurements between 2[degrees]C to 90[degrees]C with 0.1[degrees]C degree precision can be defined. The plate scheduler allows the user to graphically set up size and thermal trend measurements of various samples from the same plate using a variety of different SOPs.
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Malvern provides the materials and biophysical characterization technology and expertise that enables scientists and engineers to understand and control the properties of dispersed systems. These systems range from proteins and polymers in solution, particle and nanoparticle suspensions and emulsions, through to sprays and aerosols, industrial bulk powders and high concentration slurries. Used at all stages of research, development and manufacturing, Malvern's materials characterization instruments provide critical information that helps accelerate research and product development, enhance and maintain product quality and optimize process efficiency.
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