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Table 2 Physicochemical properties and fatty acid composition of CIO and WCO

From: Process optimization of Calophyllum inophyllum-waste cooking oil mixture for biodiesel production using Donax deltoides shells as heterogeneous catalyst

Properties Waste cooking oil Calophyllum inophyllum oil Mixture of WCO and CIO (50–50%)
Acid value = (mg of KOH g− 1 of oil) 0.25 65 33.4
Density at 27 °C (kg m− 3) 918 929 922
Kinematic viscosity at 40 °C (mm2 s−1) 26.0 59.3 40.6
Saponification value (mg of KOH g−1) 193 382 292
Palmitic acid (%) 10.1 22.3 17.1
Oleic acid (%) 84.6 55.0 57.3
Linoleic acid (%) 17.0 15.5
Stearic acid (%) 4.4 4.2
Others (%) 5.3 1.4 6.0