The supernatant was retrieved from the incubation of alginate capsules in DMEM. It was filtered using 0.22 m syringe filters in polyethersulfone (PES, by Euroclone) and mixed with water in different quantities: 1:1, 1:5, 1:10 and 1:20. Sodium alginate was dissolved in these solutions at 5 w/v. A homogeneous gel was obtained through magnetic stirring and afterwards cross-linked in 1 w/v CaCl. The obtained capsules were dried for 10 minutes in a biological hood in preparation for the association test. Each well of a 20 well plate dish was filled with 1 ml of aqueous phase and 200 l of 1-decanol was added on top of the aqueous phase. Capsules were manually placed, using tweezers, upon the decanol droplet and the time for capsules to fall to the bottom of the well plate was recorded.
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