Oral Parameters Affecting Ex-vivo Tribology

We found an effect of the type of movement performed with the tribometer. The oil concentration dependency of the measured friction was different when measured with a semi-ellipse movement compared to a linear or rotational movement. The deformation of the silicone and PDMS surfaces plays a role, replacing the silicone surface with a glass surface resulted in a different lubrication behaviour. Small changes in surface roughness of the PDMS surface affected the lubrication measured to a large extend. The impact of type of movement, type of surface and roughness of surface was not specific for the emulsions used; similar impact was found for rice starch dispersions. This investigation showed that subtle differences in the measuring conditions of the friction force can lead to different lubrication behaviour of (food) products and therefore conclusions.