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
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.