Oil yield and total polyphenol content in oil for each of the 16 experiments are presented in Table 2. Oil yields ranged from 48.9 to 73%, which is in agreement with the obtained yield for cold expression of other raw materials (Savoire et al., 2013). The maximal oil yield was obtained in trial 14. The oil polyphenol contents were extremely dispersed (from 48 to 153 mg GAE/kg). The eight last trials, which correspond to the experiments with the type 1 grape seeds, gave an oil polyphenol content approximately the double the eight first trials. Such oil polyphenol contents are however very low, representing approximately between 0.013% and 0.019% of the total polyphenols of the seeds. These low polyphenol yields could be attributed to the hydrophilic nature of polyphenols responsible for their low solubility in oil. Similar trends have already beenreported by Maier et al. (2009). The polyphenols remain in majorityin the seed cake (between 5 and 11 g GAE/100 g seed cake) and inthe fines (between 1 and 4 g GAE/100 g fines).As shown in Fig. 1, oil yield and oil polyphenol content werepositively correlated: oil polyphenol content was generally higherwhen oil yield was higher.Press capacity (seeds flow rate) and oil temperature during the 16 expression experiments are also presented in Table 2. The presscapacity varied between 6.3 and 13.9 kg/h. The highest press capacities were clearly obtained with the highest screw rotation speed,