Fig. 4From: Optimization of lipids’ ultrasonic extraction and production from Chlorella sp. using response-surface methodology2D and 3D representations of extracted lipids content in function of: (a) time and temperature (at Chlorform/Methanol = 2/1 v/v); (b) time and Chloroform/Methanol (at temperature = 45 °C); and (c) temperature and Chloroform/Methanol (at time = 18 min)Back to article page