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exoRNeasy Serum Plasma Kits

For efficient purification of RNA from exosomes and other extracellular vesicles out of serum or plasma samples
  • Maxi kit enables use of high sample volumes for detection of rare transcripts
  • Starter kit provides both maxi and midi columns for experimental flexibility
  • Provides sample to extracellular vesicle RNA isolation in just 1 hour
  • Processes multiple parallel samples with a spin-column procedure
  • Isolates both miRNA and mRNA from serum or plasma

exoRNeasy Serum/Plasma Kits use membrane affinity spin columns to efficiently isolate RNA from exosomes and other extracellular vesicles extracted from serum or plasma. The midi column enables efficient processing of smaller sample volumes (1 ml or less), while the maxi column format allows the use of large sample volumes, up to 4 ml, to detect low-abundance RNAs with high confidence. The results are fast, consistent, and highly suited to sensitive downstream applications. The exoRNeasy Serum/Plasma Kits can be automated on the QIAcube Connect.

Buy Products

Cat No./ID: 76204
Buffer XBP (250 ml)
250 ml Binding Buffer
Cat No./ID: 76214
Buffer XE (45 ml)

45 ml Elution Buffer for elution of intact extracellular vesicles

Cat No./ID: 77023
exoRNeasy Serum/Plasma Starter Kit (20)
For purification of total exosome-derived RNA from serum/plasma; includes 20 exoEasy columns (10 Maxi, 10 Midi) and 20 RNeasy MinElute spin columns
exoRNeasy Serum Plasma Kits are intended for molecular biology applications. These products are not intended for the diagnosis, prevention, or treatment of a disease.

Product Details

exoRNeasy captures all mRNA and vesicle-specific miRNAs in plasma.
RNA from pre-filtered plasma was isolated with exoRNeasy and the flow-through of the exoEasy column was used in direct lysis. Shown are raw CT values from RT-qPCR experiments with duplicate replicate isolations and duplicate qPCR reactions.

* Arroyo, J.D. et al. (2011) Argonaute2 complexes carry a population of circulating microRNAs independent of vesicles in human plasma. Proc. Natl. Acad. Sci. USA 108, 5003.
The exoRNeasy Serum/Plasma Maxi Kit workflow – sample to microvesicles to total RNA, in just one hour.
Starting with filtered plasma, the exoRNeasy Serum/Plasma Maxi Kit provides microvesicle isolation in just 20 minutes. A subsequent 35-minute isolation procedure yields total RNA. Just one hour from sample to microvesicle RNA means you can spend less time getting the RNA, and more time deciphering what it means.
exoRNeasy isolates small and large RNAs from extracellular vesicles present in plasma.
Bioanalyzer sizing was performed with vesicle-derived RNA purified by two methods. The plasma was pre-filtered (0.8 µm) to exclude larger particles and subjected to either ultracentrifugation, the current gold standard of vesicle isolation, or the exoRNeasy procedure. Both methods purify RNA of similar size and yield.
Intact vesicles are eluted from the exoEasy membrane with higher purity compared with ultracentrifugation.

Scanning electron microscopy (SEM; 20,000x magnification) was performed on a solubilized pellet from ultracentrifugation of pre-filtered (0.8 µm) plasma compared with a non-lysed eluate of an exoEasy column. Both preparations contain vesicle-shaped structures with an expected size range from 50–200 nm (white arrows; scale bar 200 nm). The preparation from ultracentrifugation also includes many smaller, unidentified structures that do not match the expected shape and size of extracellular vesicles.


The protocol for exoRNeasy purification of exosomes and other extracellular vesicles is not only faster than ultracentrifugation, but also yields a cleaner preparation. Scanning electron microscopy shows that while both techniques deliver intact vesicles of the expected size, the preparation from ultracentrifugation also contains many smaller structures that do not match the expected size or shape for EVs (see figure Intact vesicles are eluted from the exoEasy membrane with higher purity compared with ultracentrifugation).

Moreover, both exoRNeasy and the traditional ultracentrifugation method deliver similar sizes and yields of large and small RNAs, as measured by Bioanalyzer analysis (see figure exoRNeasy isolates small and large RNAs from extracellular vesicles in plasma).

Finally, exoRNeasy captures all cell-free mRNAs in plasma, as well as EV-associated miRNAs, as confirmed by RT-qPCR experiments on the RNAs purified with the exoRNeasy protocol and the flow-through from the exoEasy column (see figure exoRNeasy captures all mRNA and vesicle-specific miRNAs in plasma).

The exoRNeasy Serum/Plasma Kits improve upon traditional ultracentrifugation microvesicle isolation methods, yielding purified extracellular vesicles in just 20 minutes. Using technology developed with Exosome Diagnostics, Inc., the kits use a spin column format and specialized buffers to purify exosomes from prefiltered plasma; up to 4 ml using the maxi kit, and 1 ml using the midi kit. Total RNA is then extracted using QIAGEN miRNeasy technology. The entire procedure, from serum/plasma to RNA, takes only 1 hour. 

The exoRNeasy Serum/Plasma Starter Kit provides both midi and maxi exoEasy columns, enabling analysis at varied volumes of prefiltered plasma.
The total procedure for isolating RNA from extracellular vesicles comprises two phases: exosome purification and RNA isolation (see figure The exoRNeasy Serum/Plasma Maxi Kit workflow — sample to microvesicles to total RNA in just 1 hour). 

In the exosome purification stage, prefiltered plasma (with particles larger than 0.8 μM excluded) is mixed with Buffer XBP and bound to an exoEasy membrane affinity spin column. The bound exosomes are washed with Buffer XWP, and then lysed with QIAzol. 

In the RNA extraction step, chloroform is added to the QIAzol eluate, and the aqueous phase is recovered and mixed with ethanol. Total RNA, including miRNA, binds to the spin column, where it is washed three times and eluted. 
exoRNeasy Serum/Plasma Kits are highly suited for isolating total RNA, including mRNA and miRNA, from microvesicles found in serum or plasma samples. 

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