The biopolymer solutions were whipped using a Hobart mixing
unit (Ohio, USA) at the highest shear (i.e. shear rate of ~123 s1).
The foam volume was then monitored over time using an automated
web-cam (Logitech, Switzerland) taking pictures at predetermined
1 min intervals. The time taken for the foam to collapse
to half of its original height was derived from the recorded images.