The hexanal contents in the soy milk made from blanched soybeans under all conditions were all largely decreased, and no hexanal was detected in soy milk processed by 80 °C for 2 min, at which the protein recovery was 89%.
The lipoxygenase test showed that the enzymes were inactivated under these conditions.
Therefore, the conditions of 80 °C for 2 min were chosen for further UHT heating experiments due to the consideration for enhancing flavor in the soy milk products.