department of functional ingredients, agro technology and food innovations bornsesteeg 596708 pd wagenigen. the netherlands escola superior agraria de santarem (esds sector) de engenharia Agro-alimentar quinta do galinheiro S. pedro 2000-014 santarem portugal Universidad Autonoma de madrid (uma) Unit of food science and technology Ctra de colmenar Km 15 ,28049 Madrid Spain.
Received 11 November accepted 25 October 2005
Available online 7 december 2005