After successfully showing C-NTA of double-stained MSC-EVs in our previous study (https://bit.ly/43GG0Yk) and confirming
the results with image flow cytometry, this note describes C-NTA of multi-stained MSC-EVs using a PMX-430 QUATT NTA
system with four lasers.
Specific detection of SARS-CoV-2 corona virus from cell culture supernatants by fluorescence-based Nanoparticle Tracking Analysis
In this new application note we describe a quick determination of the physical titer of coronaviruses by fluorescence-based Nanoparticle Tracking Analysis and specific spike antibody recognition.
NTA goes colocalization:
Detection and measurement of CD9 and CD41 on
double-stained human platelet derived MSC-EV
In this report, we describe the quantification of colocalization ratios on double-stained MSC-derived EVs using fluorochrome conjugated antibodies against the
cell surface antigens CD9 and CD41, which also serve as EV marker proteins.
In addition to using Nano Particle Tracking Analysis (NTA) to measurement the size distribution and concentration of EV samples, both Microfluidic Resistive Pulse Sensing (MRPS) and the Single Particle Interference Reflectance Image Sensor (SP-IRIS) methods have been widely used as an alternative means of characterizing EVs. In this note, we relay two specific cases for using the ZetaView® NTA system to achieve relative “high-throughput” analysis of many EV samples, along estimations of throughput for MRPS & SPIRIS methods for an equivalent number of samples; further, we establish realistic estimates for the high cost of ownership for operating MRPS & SP-IRIS systems as a result of the cost of consumables as well as the substantially greater amount of time spent to run the same number of samples.
Rapid determination of purity, integrity and titer
of viruses by Fluorescence Nanoparticle Tracking
Analysis (F-NTA) using the bacteriophage Phi6
Determination of the titer of viruses and bacteriophages is an indispensable key technology in virological research and for diagnostic purposes. Depending on the method used, the measurements are either qualitative or quantitative, very time-consuming, and do not provide information about integrity or aggregation behaviour of the virus particles. Nanoparticle Tracking Analysis with the Particle Metrix ZetaView® instrument allows the user to perform a rapid concentration determination of virus particles. Using the bacteriophage Phi6 as an example, we show how titer, purity and integrity of phage particles can be measured quickly and reliably using the fluorescence detection capability of the Particle Metrix ZetaView® instrument.
The preparation of high-value biological material, such as proteins, requires a multi-step procedure of separation and purification. Each step must be optimized to reach full efficiency of yield.
Making a great exosome research tool even better, SBI has developed ExoGlow TM -NTA, a proprietary dye that enables fluorescent analysis of only the extracellular vesicles (EVs) present in a heterogeneous sample.
Reliability of concentration measurements with the Particle Metrix ZetaView® Nanoparticle Tracking Analyzer
Concentration levels of extracellular vesicles have a high clinical potential as a reference for disease.
F-NTA of fluorescent labelled bionanoparticles is an efficient technique for quantification of size and total concentration.
Shown with four-fold labeled EVs: Multi-wavelength NTA reduces total measurement time, minimizes the amount of sample required, and improves experimental reproducibility.