Exosomes are 30-150 nm tiny vesicles that are available to isolate and purify from plasma and other body fluids and regarded as the useful biomarker for therapeutic and diagnostic application. With years of experiences in exosome preparation, Creative Biolabs provides high-quality exosome purification services by using ultracentrifugation and microfiltration from both plasma and other body fluids with decreased co-purification of non-exosomal blood proteins, thus increasing the purification and integrity of exosomes.
Ultracentrifugation method isolates exosomes from other sample components based on their differential sedimentation rates, which is primarily affected by size and density. Although ultracentrifugation is a tedious and difficult process, it is still the most typical approach for exosome isolation/purification, considered as the “gold standard” method. Traditional separation of exosomes from cell culture media and body fluids is typically based on ultracentrifugation in combination with sucrose density gradients or sucrose cushions. The relatively low-density exosomes can be purified from other vesicles and particles. In general, there are three main steps for the separation of exosomes by ultracentrifugation method:
Fig.1 A typical ultracentrifugation protocol. (Momenheravi, 2013)
Microfiltration is a type of physical filtration process where a contaminated fluid passes through a special pore-sized membrane to separate microorganisms and suspended particles from process liquid. It is commonly used in conjunction with ultracentrifugation instead of first and second spins of regular differential centrifugation protocol to provide a product stream which is free of undesired contaminants. In the process of exosomes purification, microfiltration isolation method utilizes hydrophilized polyvinylidene difluoride membrane to easily purify exosomes from various samples. This technology can reduce co-purification of abundant non-exosomal proteins and increase the purification and integrity of exosomes.
Fig. 2 Overall setup for a microfiltration system.
High-purity and intact exosomes will contribute to your downstream analyses, including more accurate quantification of vesicles and proteomic characterization. Our skilled experts can help global customers to isolate and purify exosomes from various body fluids based on the advanced ultracentrifugation and microfiltration platform. If you have any demands in exosome preparation, please don’t hesitate to contact us for more information.