supernatant fluid

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su·per·na·tant flu·id

clear fluid that, after the settling out of an insoluble liquid or solid by the action of normal gravity or of centrifugal force, takes up the upper portion of the contents of a vessel.
References in periodicals archive ?
Then tubes containing these larvae were centrifuged at 1500 rpm for 5 minutes and the supernatant fluids were collected and kept at -20[degrees]C until used.
The clarified supernatant fluid was filtered with a 0.
Supernatant fluid was separated and used for inoculation in cell culture.