Any help with this lab or even a readily available reference would be very much appreciated. Preparing the extract is the touchiest part since oxidation begins immediately within the extract itself. Blend the potato in ice water, strain the solution, pour it into the smallest squeeze bottles you can to minimize air in the bottle. Immediately place bottles in ice water. Prepare this extract immediately before needed since it's somewhat of a race against time.
Many people use turnips as an enzyme source for a similar exercise.
Joy Perry Univ. We use cooled distilled water then place it with a stopper on ice. Another poster notes eliminating as much air as possible. Next year I may try cooled pH 7 buffer instead of distilled water. She then asked if using turnips as an enzyme source presents similar problems.