Dietary fibers of tomato (VITACEL TF 200) and wheat (VITACEL
WF 600/30 and VITACEL WFG HS 73) made by J. Rettenmaier &
Söhne (Germany) were purchased from Campi and Jové (Barcelona,
Spain). Their composition is given in Table 1. The pH of fiber suspensions in water (2.5 g in 47.5 g of water) was measured after
24 h.