Biscuit preparation followed the same procedure as Laguna,
Salvador, Sanz and Fiszman (2011) with the following modifications:
in the biscuits with HPMC, the HPMC was dissolved in water
at 20 g/L and then added after the flour and mixed for 30 s. at speed
60 rpm and the dough was sheeted to 10 mm in a dough laminating
machine (Parber, Zamundio, Spain) and cut into rectangular biscuits
measuring 50 30 10 mm (length width height).
Twenty-five biscuits were placed on a perforated tray. They were
baked in a conventional oven for 4 min at 175 C. The trays were
then rotated 180, bringing to the front the side that had been at the
back of the oven to ensure an even cooking, and baked for a further
4.5 min at the same temperature. The preparation conditions were
constant: same oven and oven trays, trays were placed at the same
level, and the number of biscuits baked. After reaching ambient
temperature, the biscuits were packed and stored in heat-sealed
metalized polypropylene bags.
2.3.