Acknowledgements
This research was supported by the Spanish Ministerio de Ciencia e Innovación, through CICYT Projects AGL2005-02447 ALI and AGL2008-0998 ALI. One of us (C.M-P.) acknowledges the CSIC for her postgraduate scholarship. Thanks are given to Mr. M. Takazumi from Toofu-Ya SL for the okara samples and to Dr. G. Préstamo for the help with HHP-treatment.