The samples were heated at 70 C for 1 min to prevent deterioration by spoilage caused by micro-organisms and chemical change caused by lipase. For the thermal conductivity measurements, 0.6% Montanox 60 (Polyoxyethylene sorbitan monostearate) was added to the samples before homogenizing in a two-stage homogenizer (GEA Model NS200 6L, Italy) at 25/ 3 MPa