The batter was scaled at 300 g and baked in paper cases placed
in 400 g bread tins (145 mm 75 mm at the base) in a Bone Reel
oven (Frederick Bone & Co. Ltd., Purley, UK) for 45 min, at a set oven
temperature of 180 C. Eleven sponge cakes were baked for each
formulation in duplicate. The baked products were cooled at room
temperature and sealed in polypropylene bags. After 24 h, the
sponge cakes were analysed for their weight, volume, crumb
cellular structure, texture, moisture content, and water activity.
The last three tests were conducted within 24 h after baking and
repeated after 7 days and 14 days of storage at 20 C and a relative
humidity 65% to study ageing phenomena.