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This one caught my eye, as I am so miserably behind on my reading that I had just recently read the article from January of 2017 I link to below.
Here is a dirt cheap max 125,000 rpm centrifuge with an equivalent centrifugal force of about 30,000 g max.
So, for the serum from whole blood example, which was stated as 1000-5000g with run time 10min, we'd have
5000 * 600 secs = 30,000 g-seconds, so this would handle the job very quickly, as it would easily exceed 5000g.
To get a reliable/repeatable speed, you'd need to listen to the musical note created by the whirligig as it spins - you want to reach a consistent "high note", so find someone who has some musical background to be your "operator".
If you want different g forces, you can vary the size of the disk accordingly, but there is a limit to the disk size you can spin without (catastrophically!) exceeding the tensile strength of your string.
http://nature.com/articles/s41551-016-0009
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