Traditional isolation of exosomes from cell culture media and body fluids is a tedious and difficult process with the most widely used approach based on ultracentrifugation in combination with sucrose density gradients or sucrose cushions to float the relatively low-density exosomes away from other vesicles and particles. These protocols can range in time from 8 to 30 hrs and require an ultracentrifuge and extensive training to ensure successful isolation of exosomes. Despite these drawbacks, ultracentrifugation is still the most popular approach for exosome isolation. However, within the last 2 years, several exosome isolation reagents for cell culture media and various body fluids have become commercially available. Thermo Fisher Scientific Total Exosome Isolation reagents allow recovery of exosomes using a very short and reliable protocol which is becoming more and more popular.
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