Walter et al. (1982) investigated the effects of heat penetration on sweet potato tissue under three lye-peeling treatments, Heat-mediated, starch gelatinization, cell wall separation, chromoplast disruption, and enzymatic discoloration were evaluated in different conditions according to the peeling treatment. Starch gelatinization, cell wall separation, and chromoplast disruption reduced in the order: 15 minute peel; 30 minute pre-soak (water 78-83องศา); followed by a 6 minute peel Discoloration occurred in significant amounts only in the 6 minute peel because heat penetration was sufficient to disrupt lacticifer organization but insufficient to inactive the polyphenol oxidizing (PPO) enzyme. The 30 minute pre-soak and 6 minute peel treatment resulted in the best product