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exosome amount from 40 ml of cell culture supernatants should be seen by naked eyes. The while pellet is because of leftover PEG bound to proteins/lipid, of course exosome microvesicle too. Ultracentrifugation of 40 ml of cell culture supernatants will give you less pellet but transparent. If you do NTA (counting particle/exosome absolute number) and protein assay, the ratio NTA/protein of the different isolation method will tell you which one is purer and which method is reliable.
Best,
John |
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