saucepan containing about 500 ml
1.5% fresh-squeezed lemon juice
The boiled potatoes
were then peeled to remove the skin, and cut into large
chunks (5–7.5 cm) using a knife.
kept at room temperature
boiled potatoes
acetone-petroleum ether extraction
filtration through a sintered glass filter
under vacuum
vacuum filter
with black cloth
mortar and pestle were rinsed
with small amounts of acetone