Yacon juice and concentrated yacon juice were
added with an ovalbumin or emulsifier in order to form foams
which were subjected to different whipping times according to
a 22 factorial design. After formation of the foams, their density,
overrun, physical stability, yield stress, and structural microscopy
were assessed. The data analysis obtained by response
surface methodology was able to identify that the concentration
of the foaming agent together with the time of air
incorporation led to reduced density, increased expansion and
air volume fraction, and physical stability of the product.
Foams formed with the addition of an ovalbumin showed
higher yield stress values than those added with an emulsifier.
During the resting period, the yield stress was reduced for both
foaming agents. By analyzing the images of the foams, it was
found that the greater the number of air bubbles present, the
smaller their diameter, a behavior affected by the resting time.
Foams formed with higher concentrations of foaming agent
and longer whipping times showed the most desirable characteristics
for the purpose of foam mat drying