The viscosity at 40 °C was determined with a Brookfield model
DV-III digital rheometer. A 25-mL pycnometer with a coupled
thermometer was used to determine the density at 20 °C. The
acidity was determined according to the American Oil Chemical
Society (AOCS). The moisture content was determined by the Karl
Fished method using an Analyzer apparatus, model Moisture
Control KF-1000. The calorific value was determined using a Parr
6200 calorimeter. All analyses were performed in triplicate