The muffins were left to cool at room temperature for 1 h on
a rack in order to avoid moisture condensing on their undersurface.
The 12 muffins baked on the same baking tray were packed in sets
of six in two polypropylene bags (O2 permeability at
23 C¼ 1650 cm3/m2.day; water vapour permeability at 38 C and
90% humidity¼ 9 g/m2.day; thickness¼ 65 mm) and stored at 20 C
for 28 days. The measurements to study the effect of storage time
were made at 0, 7, 14, 21 and 28 days from the baking date.
the oven were identical in each case.