Potato blanching is a heat treatment applied to cut potatoes using hot water or steam before drying or frying, which inactivates enzymes, removes surface sugars and starch, and directly influences final fry colour and acrylamide formation potential.
In trade practice
Time and temperature parameters are validated for each cut size and variety, and blanching records form part of the process documentation reviewed during audits. Reducing sugar content of the raw tuber is monitored because high levels lead to excessive colour development during frying. Over-blanching softens the potato structure and increases water uptake, while under-blanching leaves residual enzyme activity that causes discolouration in storage. Buyers may request blanching validation data as a condition of approval.
In a specification
A specification or quality plan states the target blanching time and temperature range, the maximum residual peroxidase or catalase activity as an enzyme inactivation benchmark, and the acceptable reducing sugar level in the raw material.