Afterwards, this mixture was poured into the solid lipid and mixed again. The samples were placed in Petri dishes and cooled at room temperature (25 ± 1 ºC). In case of low solubility with the liquid lipid, three different BTB concentrations were studied: 5.00, 14.50 and 25.00% (w/w). For liquid lipid of high solubility, a mixture design of experiments (DoE) was used.