Fig. 4
From: Enhancing spontaneous biosurfactant production through water steeping of olive mill waste
Contact angle of glass surface coated with water (a) with extracts obtained from OMW with ethyl acetate: in presence solids and without steeping process (b), in presence of solids with steeping process (c), without solids and without steeping process (d), without solids and with steeping process (e), and via Soxhlet (f).
