The raw potatoes were cleaned with tap water before being
rinsed with distilled water. After removing surface water with tissue
paper, the sweet potatoes were air dried and weighed. These
were peeled, quartered and cut into small cubes, which were
ground in a food processor (Jaipan, JP-FM1100, Jaipan Industries
Limited, Mumbai, India). The food processor was previously rinsed
with sodium hypochlorite solution (2% in boiled water). Cleaning
of food processor was done prior to processing of each potato variety.
The sample processing operation was carried out rapidly to
avoid enzymatic degradation.