Stability of potato crisps subjected to several conditions of storage

Abstract

The progression of deterioration of crisps stored at room temperature (day light and darkness), and in darkness at 40ºC and -23ºC (control) was evaluated. The samples were obtained from a leader industry of the chilean market. The potatoes were evaluated until the panel detected significant difference (0.05>p) for «strange» odour and flavour. Chemical evaluation was performed on the oil extracted from the potatoes. Sensory evaluation showed significant differences (0.05>p) against control at 48, 72 and 9 days of storage at daylight and darkness room temperature, and 40ºC respectively. During the frying process about 80% of terbutilhydroquinone (TBHQ) was lost, delta and gamma tocopherol decreased around 43 and 30% respectively. Thermic deterioration was the most important during frying while only oxidation increased during storage. A relationship between sensory and chemical deterioration was established. It was found that, for the same polar compound percentage, a period of time around 7 times higher was necessary at room temperature in darkness, than at 40ºC.